Is traction control holding me back.....
Is traction control holding me back.....
09-07-2019, 01:07 AM
The cable pulls on a sensor then a motor actually opens the throttle plate.
The only way to improve is to replace the throttle body with a manual one.
![[Image: LexuS-Copy.jpg]](http://i65.photobucket.com/albums/h204/Sparkystav/LexuS-Copy.jpg)
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
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OutlawJapClub Admin Team
Sparkystav
09-07-2019, 01:07 AM #11In all seriousness the delay is because the throttle is motor controlled.
The cable pulls on a sensor then a motor actually opens the throttle plate.
The only way to improve is to replace the throttle body with a manual one.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
OutlawJapClub Admin Team
09-07-2019, 02:40 AM
mattlaw The traction contrOl on my is300, when turned off will turn itself back on if I get a little to giddyStrangeness. I've drove some cars where the traction control turns back on after a set time of if you go over a set speed, But not when it senses that your hooning?
Very odd.
Scotty B.
mattlaw The traction contrOl on my is300, when turned off will turn itself back on if I get a little to giddyStrangeness. I've drove some cars where the traction control turns back on after a set time of if you go over a set speed, But not when it senses that your hooning?
Very odd.
Scotty B.
09-07-2019, 03:36 AM
Sparkystav In all seriousness the delay is because the throttle is motor controlled.
The cable pulls on a sensor then a motor actually opens the throttle plate.
Surly if it was down to the response speed of a stepper motor it would feel as lethargic in all gears? If I chug along at 1500rpm in third and floor it then it immediately starts accelerating as hard as it can. If I do the same in first it feels like the snow buttons been pressed.
I'm sure the traction control's doing something different with the throttle response when it's in first (And possibly second). It's like it'll only feed in the power gradually when it's in first.
Even on really wet roads it won't do more than spin up a wheel slightly till it locks up the diff and then gently accelerates off the lights, But by the time it gets up to around 3 to 3500rpm the amount of power it will allow me might be enough for it to break traction and spin up the wheels....... Then the VVTi system wakes up and it almost instantly jumps up to he redline. It can make beating someone off the lights a bit of a hit or miss affair.
In snow (With traction control off) it'll spin the wheels if i so much as glance down at the throttle pedal, but in that situation even the gentlest throttle response would make it break traction.
As I said, It annoys me because when it's dry I feel like it could get a fare bit more power down without wheelspinning.......Or it could use the extra oomph to break traction if the mood took me that direction.
I've drove a fare few cars (And vans) in the last 20 years, But most of the stuff I've actually owned has been older carb fed toys. From what I can feel when driving my IS200, This does feel to me like the accelerations being artificially stifles in first. Be it for traction, Or possibly some system to stop me from lunching the gearbox........ Me not likey !!!!!
Scotty B.
Edited 19-08-2012, 01:18 PM by Mr Reman.
Sparkystav In all seriousness the delay is because the throttle is motor controlled.
The cable pulls on a sensor then a motor actually opens the throttle plate.
Surly if it was down to the response speed of a stepper motor it would feel as lethargic in all gears? If I chug along at 1500rpm in third and floor it then it immediately starts accelerating as hard as it can. If I do the same in first it feels like the snow buttons been pressed.
I'm sure the traction control's doing something different with the throttle response when it's in first (And possibly second). It's like it'll only feed in the power gradually when it's in first.
Even on really wet roads it won't do more than spin up a wheel slightly till it locks up the diff and then gently accelerates off the lights, But by the time it gets up to around 3 to 3500rpm the amount of power it will allow me might be enough for it to break traction and spin up the wheels....... Then the VVTi system wakes up and it almost instantly jumps up to he redline. It can make beating someone off the lights a bit of a hit or miss affair.
In snow (With traction control off) it'll spin the wheels if i so much as glance down at the throttle pedal, but in that situation even the gentlest throttle response would make it break traction.
As I said, It annoys me because when it's dry I feel like it could get a fare bit more power down without wheelspinning.......Or it could use the extra oomph to break traction if the mood took me that direction.
I've drove a fare few cars (And vans) in the last 20 years, But most of the stuff I've actually owned has been older carb fed toys. From what I can feel when driving my IS200, This does feel to me like the accelerations being artificially stifles in first. Be it for traction, Or possibly some system to stop me from lunching the gearbox........ Me not likey !!!!!
Scotty B.
09-07-2019, 03:49 AM
Or possibly could the ECU work this out from the RPM and road speed (Mine's a '01 IS200 sport if that would make any difference)?
Scotty B.
Off at a slight tangent, But does anyone know if the gearbox has a switch on it that makes the ECU aware when it's in first?
Or possibly could the ECU work this out from the RPM and road speed (Mine's a '01 IS200 sport if that would make any difference)?
Scotty B.
09-07-2019, 04:37 AM
And yes you can work out the relation between speed and revs to equal gears. You just need the wheel size, gearbox ratio, and Roma.
And no the ecu doesn't talk to the ecu.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
OutlawJapClub Admin Team
Sparkystav
09-07-2019, 04:37 AM #16The throttle delay is the same though all gears but as you don't have the same acceleration in the later gears that's why you don't feel it.
And yes you can work out the relation between speed and revs to equal gears. You just need the wheel size, gearbox ratio, and Roma.
And no the ecu doesn't talk to the ecu.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
OutlawJapClub Admin Team
09-07-2019, 05:23 AM
Sparkystav The throttle delay is the same though all gears but as you don't have the same acceleration in the later gears that's why you don't feel it.
OK, Let's put this another way.
It's like I have a HUGE flat spot between idle and 3000rpm. Above that it pulls OK, Then the VVTi does it's thing and it's like the engine wakes up. It doesn't misfire. The power delivery's smooth, Just overly progressive. In second gear the flat spot doesn't feel so pronounced. By third it pulls very nicely till the VVTi says hello and the revs leap for the redline. It feels like it's being held back in first, But it feels too smooth to be a fault. It feels like it was designed to be like this.
From chugging along at 1200rpm the revs build a lot quicker in second than in first. but it feels like the revs are being electronically governed to prevent them from building up too fast in first.
Does this make sense?
Scotty B.
Sparkystav The throttle delay is the same though all gears but as you don't have the same acceleration in the later gears that's why you don't feel it.
OK, Let's put this another way.
It's like I have a HUGE flat spot between idle and 3000rpm. Above that it pulls OK, Then the VVTi does it's thing and it's like the engine wakes up. It doesn't misfire. The power delivery's smooth, Just overly progressive. In second gear the flat spot doesn't feel so pronounced. By third it pulls very nicely till the VVTi says hello and the revs leap for the redline. It feels like it's being held back in first, But it feels too smooth to be a fault. It feels like it was designed to be like this.
From chugging along at 1200rpm the revs build a lot quicker in second than in first. but it feels like the revs are being electronically governed to prevent them from building up too fast in first.
Does this make sense?
Scotty B.
09-07-2019, 05:30 AM
Mr Reman I bet you two would be a barrel of laughs spectating at a round of the British Drift Championship, You'd be pointing and saying "He'd get around that corner a hell of a lot quicker if he didn't hang the back end out like that".:biggrin:
Oh I'm sorry. I didn't realise you were a drifter and we were talking about a BDC car round a track. I can't for a moment believe you would be suggesting on an open forum about you drifting on a public road. :thumbdown:
In any case, if you want that kind of wheelspin, you need moar powar - it's not a traction control issue, it's Lexus' underpowered barge engine issue. I presume the super/turbocharged gang can get the back end out pretty effortlessly.
speedfreek
09-07-2019, 05:30 AM #20Mr Reman I bet you two would be a barrel of laughs spectating at a round of the British Drift Championship, You'd be pointing and saying "He'd get around that corner a hell of a lot quicker if he didn't hang the back end out like that".:biggrin:
Oh I'm sorry. I didn't realise you were a drifter and we were talking about a BDC car round a track. I can't for a moment believe you would be suggesting on an open forum about you drifting on a public road. :thumbdown:
In any case, if you want that kind of wheelspin, you need moar powar - it's not a traction control issue, it's Lexus' underpowered barge engine issue. I presume the super/turbocharged gang can get the back end out pretty effortlessly.
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