supercharger pulley
supercharger pulley
27-10-2018, 03:06 PM
On your other issue, I've been running a switchable supercharger for about a year now. But instead of a manually operated switch, I mounted a microswitch on the charger bypass valve so when it starts to close, the supercharger rotates.
I haven't noticed any decrease in engine performance by having this system. And I'm pretty sure enough air gets to the throttle body via the bypass pipe and through the charger itself when it's not running.
My system has definitely increased mpg, if only by a few miles, but better than a kick in the slats. :biggrin:
And it's fun to see the look on people's faces as 'that standard looking IS200' suddenly screams like a banshee when I put my foot down.
hock:
I'd be very interested in whether the 138mm pulley fits. Because that'll give a bit extra without altering things too drastically as is the case with the 150mm upgrade pulley.
On your other issue, I've been running a switchable supercharger for about a year now. But instead of a manually operated switch, I mounted a microswitch on the charger bypass valve so when it starts to close, the supercharger rotates.
I haven't noticed any decrease in engine performance by having this system. And I'm pretty sure enough air gets to the throttle body via the bypass pipe and through the charger itself when it's not running.
My system has definitely increased mpg, if only by a few miles, but better than a kick in the slats. :biggrin:
And it's fun to see the look on people's faces as 'that standard looking IS200' suddenly screams like a banshee when I put my foot down. hock:
28-10-2018, 02:08 AM
Talisker I'd be very interested in whether the 138mm pulley fits. Because that'll give a bit extra without altering things too drastically as is the case with the 150mm upgrade pulley.
On your other issue, I've been running a switchable supercharger for about a year now. But instead of a manually operated switch, I mounted a microswitch on the charger bypass valve so when it starts to close, the supercharger rotates.
I haven't noticed any decrease in engine performance by having this system. And I'm pretty sure enough air gets to the throttle body via the bypass pipe and through the charger itself when it's not running.
My system has definitely increased mpg, if only by a few miles, but better than a kick in the slats. :biggrin:
And it's fun to see the look on people's faces as 'that standard looking IS200' suddenly screams like a banshee when I put my foot down.
Very interesting idea. I have thought about doing something like this (once I get my charger boosting again!) But then thought it may not make any difference! How much does it really help? The charger is only generating boost when the bypass is closed anyway, the rest of the time it is just spinning freely on it's bearings. I can't imagine that there is a noticeable load on the engine when their is no resistance the output side of the charger? Though I am not certain!
![[Image: tempsig2.jpg]](http://i121.photobucket.com/albums/o227/84stoney/tempsig2.jpg)
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:Talisker I'd be very interested in whether the 138mm pulley fits. Because that'll give a bit extra without altering things too drastically as is the case with the 150mm upgrade pulley.
On your other issue, I've been running a switchable supercharger for about a year now. But instead of a manually operated switch, I mounted a microswitch on the charger bypass valve so when it starts to close, the supercharger rotates.
I haven't noticed any decrease in engine performance by having this system. And I'm pretty sure enough air gets to the throttle body via the bypass pipe and through the charger itself when it's not running.
My system has definitely increased mpg, if only by a few miles, but better than a kick in the slats. :biggrin:
And it's fun to see the look on people's faces as 'that standard looking IS200' suddenly screams like a banshee when I put my foot down.
Very interesting idea. I have thought about doing something like this (once I get my charger boosting again!) But then thought it may not make any difference! How much does it really help? The charger is only generating boost when the bypass is closed anyway, the rest of the time it is just spinning freely on it's bearings. I can't imagine that there is a noticeable load on the engine when their is no resistance the output side of the charger? Though I am not certain!
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:
28-10-2018, 02:49 AM
The advantages I've identified by reinstating the magnetic clutch are;
1.) Slightly increased MPG.
2.) When the car is idling and driven 'non spirited' it sounds standard.
3.) There's less load on the engine off boost because the supercharger rotors don't turn only the pulley freewheels.
4.) There is less wear on your supercharger internals because they'll be turning only a fraction of the time.
Edited 09-12-2011, 12:25 PM by Talisker.
Sorry Buzzard, it seems i've hijacked your thread slightly.
The advantages I've identified by reinstating the magnetic clutch are;
1.) Slightly increased MPG.
2.) When the car is idling and driven 'non spirited' it sounds standard.
3.) There's less load on the engine off boost because the supercharger rotors don't turn only the pulley freewheels.
4.) There is less wear on your supercharger internals because they'll be turning only a fraction of the time.
28-10-2018, 03:41 AM
Talisker Sorry Buzzard, it seems i've hijacked your thread slightly.
And I've helped. I'm also sorry!
Talisker The advantages I've identified by reinstating the magnetic clutch are;
1.) Slightly increased MPG.
2.) When the car is idling and driven 'non spirited' it sounds standard.
3.) There's less load on the engine off boost because the supercharger rotors don't turn only the pulley freewheels.
4.) There is less wear on your supercharger internals because they'll be turning only a fraction of the time.
1.) How much though? The rotors spin freely on bearings, I can turn them easily by hand, I imagine the load on the engine to be negligible whilst off boost, which would render any fuel savings also negligible.
2.) Totally agree, though whether this is an advantage or not is purely down to personal preference.
3.) See my response to no 1.)!
4.) In theory, yes, this is correct also, but in reality I would guess that the majority of he wear on the charger internals occurs when it is on boost, and actually doing something?
I have been driving with my charger spinning and the bypass jammed open for a couple of weeks now (my bypass spring broke!) The car is a bit sluggish, but is ok for pottering around town. Only since I have been driving like this have I considered making it switchable. Either a micro switch on the bypass, as you have, or a manual switch in the cabin.
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:Talisker Sorry Buzzard, it seems i've hijacked your thread slightly.
And I've helped. I'm also sorry!
Talisker The advantages I've identified by reinstating the magnetic clutch are;
1.) Slightly increased MPG.
2.) When the car is idling and driven 'non spirited' it sounds standard.
3.) There's less load on the engine off boost because the supercharger rotors don't turn only the pulley freewheels.
4.) There is less wear on your supercharger internals because they'll be turning only a fraction of the time.
1.) How much though? The rotors spin freely on bearings, I can turn them easily by hand, I imagine the load on the engine to be negligible whilst off boost, which would render any fuel savings also negligible.
2.) Totally agree, though whether this is an advantage or not is purely down to personal preference.
3.) See my response to no 1.)!
4.) In theory, yes, this is correct also, but in reality I would guess that the majority of he wear on the charger internals occurs when it is on boost, and actually doing something?
I have been driving with my charger spinning and the bypass jammed open for a couple of weeks now (my bypass spring broke!) The car is a bit sluggish, but is ok for pottering around town. Only since I have been driving like this have I considered making it switchable. Either a micro switch on the bypass, as you have, or a manual switch in the cabin.
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:
28-10-2018, 04:12 AM
just gives me something to occupy my hands,keeps me off the ale for a while.
no doubt the 138 wont fit,but I will make it fit somehow, re drill or fill the holes and drill new ones,just need a pulley that's sits flush and doesn't jut out towards the radiator too much.
happy days.:laugh:
buzzard2011
28-10-2018, 04:12 AM #25hey, that's fine,hijack away ha-ha,as long as it gets the ideas flowing,i agree with both your comments,im not going to run a bypass,just a bov,so I didn't want the charger to spin all the time,and i do like the idea of flipping a switch as Talisker says screaming like a banshee.
just gives me something to occupy my hands,keeps me off the ale for a while.
no doubt the 138 wont fit,but I will make it fit somehow, re drill or fill the holes and drill new ones,just need a pulley that's sits flush and doesn't jut out towards the radiator too much.
happy days.:laugh:
28-10-2018, 06:14 AM
Stoney And I've helped. I'm also sorry!
1.) How much though? The rotors spin freely on bearings, I can turn them easily by hand, I imagine the load on the engine to be negligible whilst off boost, which would render any fuel savings also negligible.
2.) Totally agree, though whether this is an advantage or not is purely down to personal preference.
3.) See my response to no 1.)!
4.) In theory, yes, this is correct also, but in reality I would guess that the majority of he wear on the charger internals occurs when it is on boost, and actually doing something?
I have been driving with my charger spinning and the bypass jammed open for a couple of weeks now (my bypass spring broke!) The car is a bit sluggish, but is ok for pottering around town. Only since I have been driving like this have I considered making it switchable. Either a micro switch on the bypass, as you have, or a manual switch in the cabin.
Okey doke.
1.) I work out my average MPG every now and then when I fill up with fuel, since doing this modification it's increased between 3-5 MPG. Not huge but it saves a few pennies.
2.) It's an advantage for me and purely personal preference because I have an induction kit and I find the drone is terrible at idle and motorway speeds.
3.) The resistance to movement is proportional to the amount of air the charger is moving. So with the normal setup you are wasting energy by having the rotors turning and the bypass valve fully open.
4.) I bought an unmodified Eaton M62 from a mercedes for a bit of casual porting, and when I took it apart and compared it with my original one I was surprised by how much scoring there was on the case and the rotor tips of the original. It would be interesting to see a few more but I could only put this down to the fact that the TTE superchargers suffer more wear because they are 'on' 100% of the time.
Stoney And I've helped. I'm also sorry!
1.) How much though? The rotors spin freely on bearings, I can turn them easily by hand, I imagine the load on the engine to be negligible whilst off boost, which would render any fuel savings also negligible.
2.) Totally agree, though whether this is an advantage or not is purely down to personal preference.
3.) See my response to no 1.)!
4.) In theory, yes, this is correct also, but in reality I would guess that the majority of he wear on the charger internals occurs when it is on boost, and actually doing something?
I have been driving with my charger spinning and the bypass jammed open for a couple of weeks now (my bypass spring broke!) The car is a bit sluggish, but is ok for pottering around town. Only since I have been driving like this have I considered making it switchable. Either a micro switch on the bypass, as you have, or a manual switch in the cabin.
Okey doke.
1.) I work out my average MPG every now and then when I fill up with fuel, since doing this modification it's increased between 3-5 MPG. Not huge but it saves a few pennies.
2.) It's an advantage for me and purely personal preference because I have an induction kit and I find the drone is terrible at idle and motorway speeds.
3.) The resistance to movement is proportional to the amount of air the charger is moving. So with the normal setup you are wasting energy by having the rotors turning and the bypass valve fully open.
4.) I bought an unmodified Eaton M62 from a mercedes for a bit of casual porting, and when I took it apart and compared it with my original one I was surprised by how much scoring there was on the case and the rotor tips of the original. It would be interesting to see a few more but I could only put this down to the fact that the TTE superchargers suffer more wear because they are 'on' 100% of the time.
28-10-2018, 07:34 AM
Talisker Okey doke.
1.) I work out my average MPG every now and then when I fill up with fuel, since doing this modification it's increased between 3-5 MPG. Not huge but it saves a few pennies.
2.) It's an advantage for me and purely personal preference because I have an induction kit and I find the drone is terrible at idle and motorway speeds.
3.) The resistance to movement is proportional to the amount of air the charger is moving. So with the normal setup you are wasting energy by having the rotors turning and the bypass valve fully open.
4.) I bought an unmodified Eaton M62 from a mercedes for a bit of casual porting, and when I took it apart and compared it with my original one I was surprised by how much scoring there was on the case and the rotor tips of the original. It would be interesting to see a few more but I could only put this down to the fact that the TTE superchargers suffer more wear because they are 'on' 100% of the time.
Ok, now we really have hijacked this thread! But it's an interesting debate, so I'll continue!
1.) The official figures for the charger, are that it adds 3.3% to the fuel consumption. So if you got 30mpg without it (arbitrary figure, in the correct region) you should get 29mpg with the charger. You still have your charger boosting at times, and so the advantages should be less than that quoted 1mpg, if noticeable at all - IN THEORY! It depends how accurately your calculations are, and how similarly you drive over different periods of time etc. and so mpg calculations you make yourself (as I do also) will never be very accurate, as too many variables are involved, that cannot be precisely regulated.
2.) As I said, I agree, I quite like the sound of the induction, but maybe not all the time!
3.) When the bypass is open and the charger is spinning, very little air is being moved at all, as the pressure on the inlet and outlet sides of the charger are equalised by the bypass pipe, and no real pressure is generated inside the charger.
4.) I think the internal condition of these chargers can vary a lot. Mine has been fitted (previous car) for about 5 years and 40k miles, and inside there was no noticeable scoring at all of the lobes or casing. Though you are of course right, in theory, that the less it spins the less chance of scoring. I was previously thinking of wear just on the bearings, I think.
I don't have any post clean up pics, but once the oil was cleaned off, the charger looked new inside!
![[Image: 299262_10150274127586491_540486490_84146...1954_n.jpg]](https://a2.sphotos.ak.fbcdn.net/hphotos-ak-snc7/299262_10150274127586491_540486490_8414696_7911954_n.jpg)
![[Image: 303277_10150274127421491_540486490_84146...3683_n.jpg]](https://a6.sphotos.ak.fbcdn.net/hphotos-ak-snc7/303277_10150274127421491_540486490_8414694_1613683_n.jpg)
I'm certainly not trying to argue with you, but simply discuss the principals of this setup as I see them. Sorry again to the original poster for going a little :offtopic:
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:Talisker Okey doke.
1.) I work out my average MPG every now and then when I fill up with fuel, since doing this modification it's increased between 3-5 MPG. Not huge but it saves a few pennies.
2.) It's an advantage for me and purely personal preference because I have an induction kit and I find the drone is terrible at idle and motorway speeds.
3.) The resistance to movement is proportional to the amount of air the charger is moving. So with the normal setup you are wasting energy by having the rotors turning and the bypass valve fully open.
4.) I bought an unmodified Eaton M62 from a mercedes for a bit of casual porting, and when I took it apart and compared it with my original one I was surprised by how much scoring there was on the case and the rotor tips of the original. It would be interesting to see a few more but I could only put this down to the fact that the TTE superchargers suffer more wear because they are 'on' 100% of the time.
Ok, now we really have hijacked this thread! But it's an interesting debate, so I'll continue!
1.) The official figures for the charger, are that it adds 3.3% to the fuel consumption. So if you got 30mpg without it (arbitrary figure, in the correct region) you should get 29mpg with the charger. You still have your charger boosting at times, and so the advantages should be less than that quoted 1mpg, if noticeable at all - IN THEORY! It depends how accurately your calculations are, and how similarly you drive over different periods of time etc. and so mpg calculations you make yourself (as I do also) will never be very accurate, as too many variables are involved, that cannot be precisely regulated.
2.) As I said, I agree, I quite like the sound of the induction, but maybe not all the time!
3.) When the bypass is open and the charger is spinning, very little air is being moved at all, as the pressure on the inlet and outlet sides of the charger are equalised by the bypass pipe, and no real pressure is generated inside the charger.
4.) I think the internal condition of these chargers can vary a lot. Mine has been fitted (previous car) for about 5 years and 40k miles, and inside there was no noticeable scoring at all of the lobes or casing. Though you are of course right, in theory, that the less it spins the less chance of scoring. I was previously thinking of wear just on the bearings, I think.
I don't have any post clean up pics, but once the oil was cleaned off, the charger looked new inside!
I'm certainly not trying to argue with you, but simply discuss the principals of this setup as I see them. Sorry again to the original poster for going a little :offtopic:
ad: It was a tough call to make, but the Supercharged IS200 is being retired. ad:
28-10-2018, 12:49 PM
Stoney Ok, now we really have hijacked this thread! But it's an interesting debate, so I'll continue!
1.) The official figures for the charger, are that it adds 3.3% to the fuel consumption. So if you got 30mpg without it (arbitrary figure, in the correct region) you should get 29mpg with the charger. You still have your charger boosting at times, and so the advantages should be less than that quoted 1mpg, if noticeable at all - IN THEORY! It depends how accurately your calculations are, and how similarly you drive over different periods of time etc. and so mpg calculations you make yourself (as I do also) will never be very accurate, as too many variables are involved, that cannot be precisely regulated.
2.) As I said, I agree, I quite like the sound of the induction, but maybe not all the time!
3.) When the bypass is open and the charger is spinning, very little air is being moved at all, as the pressure on the inlet and outlet sides of the charger are equalised by the bypass pipe, and no real pressure is generated inside the charger.
4.) I think the internal condition of these chargers can vary a lot. Mine has been fitted (previous car) for about 5 years and 40k miles, and inside there was no noticeable scoring at all of the lobes or casing. Though you are of course right, in theory, that the less it spins the less chance of scoring. I was previously thinking of wear just on the bearings, I think.
:
So what can we learn from this?
1.) I think the MPG debate can ony be fully sorted by getting the same car and testing the 2 sytems on a calibrated test bed with an identical driving profile to reduce, if not eliminate, unknown variables.
2.) The sound. Well that depends on your own preference.
3.) I disagree with what your saying about the air moving through the charger, but I could be wrong. When the rotors are turning, by it's design it'll be sucking one end and blowing the other end causing a pressure differential. The pressure differential between the inlet and outlet will be smaller because of the bypass pipe but it'll still be there. Hence the charger is still doing work and there will be a natural resitance to work. But I reckon the only way to sort this out would be to measure the amount of effort it takes to spin the supercharger at a constant speed in and out of a vacuum.
Even if we take the air out of the equation the engine is still providing extra effort to accelerate the rotors.
4.) Like I said it would be interesting to see inside a few more superchargers of the TTE type and standard mercedes type of similar miles to fully assess whether a bolted clutch causes accelerated wear. It could just be that my bearings were beginning to fail causing the extra scoring on the case. I don't know how many miles my supercharger had done before I got my grubby little hands on it.
I'm not trying to argue either, I'm just providing my own opinion.
I think it should be up to others to read between the lines our fun little debate and draw their own conclusions.
Stoney Ok, now we really have hijacked this thread! But it's an interesting debate, so I'll continue!
1.) The official figures for the charger, are that it adds 3.3% to the fuel consumption. So if you got 30mpg without it (arbitrary figure, in the correct region) you should get 29mpg with the charger. You still have your charger boosting at times, and so the advantages should be less than that quoted 1mpg, if noticeable at all - IN THEORY! It depends how accurately your calculations are, and how similarly you drive over different periods of time etc. and so mpg calculations you make yourself (as I do also) will never be very accurate, as too many variables are involved, that cannot be precisely regulated.
2.) As I said, I agree, I quite like the sound of the induction, but maybe not all the time!
3.) When the bypass is open and the charger is spinning, very little air is being moved at all, as the pressure on the inlet and outlet sides of the charger are equalised by the bypass pipe, and no real pressure is generated inside the charger.
4.) I think the internal condition of these chargers can vary a lot. Mine has been fitted (previous car) for about 5 years and 40k miles, and inside there was no noticeable scoring at all of the lobes or casing. Though you are of course right, in theory, that the less it spins the less chance of scoring. I was previously thinking of wear just on the bearings, I think.
:
So what can we learn from this?
1.) I think the MPG debate can ony be fully sorted by getting the same car and testing the 2 sytems on a calibrated test bed with an identical driving profile to reduce, if not eliminate, unknown variables.
2.) The sound. Well that depends on your own preference.
3.) I disagree with what your saying about the air moving through the charger, but I could be wrong. When the rotors are turning, by it's design it'll be sucking one end and blowing the other end causing a pressure differential. The pressure differential between the inlet and outlet will be smaller because of the bypass pipe but it'll still be there. Hence the charger is still doing work and there will be a natural resitance to work. But I reckon the only way to sort this out would be to measure the amount of effort it takes to spin the supercharger at a constant speed in and out of a vacuum.
Even if we take the air out of the equation the engine is still providing extra effort to accelerate the rotors.
4.) Like I said it would be interesting to see inside a few more superchargers of the TTE type and standard mercedes type of similar miles to fully assess whether a bolted clutch causes accelerated wear. It could just be that my bearings were beginning to fail causing the extra scoring on the case. I don't know how many miles my supercharger had done before I got my grubby little hands on it.
I'm not trying to argue either, I'm just providing my own opinion.
I think it should be up to others to read between the lines our fun little debate and draw their own conclusions.
26-11-2018, 12:48 PM
just thought id give an update for those who are interested,got the 138mm pulley from merc land in germanland,and yes i had to drill it lmao,knew i would,anyway sits quite flush and spins straight.
the cradle is done after about a month of welding,beating,cutting,welding and beating some more,a hammer is good for fettling and final adjustment.
didn't do anything over Christmas as the other half didn't like me welding in the kitchen.haha, haven't got a garage you see.
first few fits of the charger got a bit of vibration on deceleration,so pulley alignment probs,a few spacers sorted that out.
as yet not wired up the charger clutch,so dont know the sound of it,maybee tommorow.lf its not peeing down,and after ive fitted a new calliper,cause the old one is fooked.
nearly there though,should be boosting soon...........
buzzard2011
26-11-2018, 12:48 PM #29appy new year people,maybee.
just thought id give an update for those who are interested,got the 138mm pulley from merc land in germanland,and yes i had to drill it lmao,knew i would,anyway sits quite flush and spins straight.
the cradle is done after about a month of welding,beating,cutting,welding and beating some more,a hammer is good for fettling and final adjustment.
didn't do anything over Christmas as the other half didn't like me welding in the kitchen.haha, haven't got a garage you see.
first few fits of the charger got a bit of vibration on deceleration,so pulley alignment probs,a few spacers sorted that out.
as yet not wired up the charger clutch,so dont know the sound of it,maybee tommorow.lf its not peeing down,and after ive fitted a new calliper,cause the old one is fooked.
nearly there though,should be boosting soon...........
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