Help! What turbo size is best 1gfe?
Help! What turbo size is best 1gfe?
1:a big compressor looks awesome, also Im modifying the bonnet so you see the turbo through the top of bonnet.
2:a big compressor will create boost quicker in the hoses/inlet/intercooler etc reducing turbo lag.
3:the exhaust is small enough to reduce any turbo lag but bit enough for good BHP.
So what does anyone think? Is this size any good? what experience has anyone with a turbo 1gfe had? Any advise would be greatly appreciated.
Cheers guys
Need some advise on what size turbo I should fit to my 1gfe 6cyl engine. Im not after massive power and I only want to run 5psi max as I still want it to be reliable. I was thinking of using a gt30 with an a/r .70 compressor and a/r.48 exhaust housing. Im thinking of using this size for a number of reasons.
1:a big compressor looks awesome, also Im modifying the bonnet so you see the turbo through the top of bonnet.
2:a big compressor will create boost quicker in the hoses/inlet/intercooler etc reducing turbo lag.
3:the exhaust is small enough to reduce any turbo lag but bit enough for good BHP.
So what does anyone think? Is this size any good? what experience has anyone with a turbo 1gfe had? Any advise would be greatly appreciated.
Cheers guys
mine has a fair bit of lag but the my exhaust housing is 0.82 i believe(Think) i reckon if i change this to a 0.7 poss a 0.63 then id be setup pretty gd with minimal lag. I assume you are running standard internals as you only want 0.5 boost? Alot of the other users use the GT30 and have no problems but i am unsure of the A/R's
I would of thought that A/R .48 would be abit small personally id go with 0.63 but i am no expert by far
Jimbob-T-Lex
21-04-2021, 04:55 AM #2Hi mate i run a 1gfe turbo i did believe mine to be a GT35 but it turns out it is not lol
mine has a fair bit of lag but the my exhaust housing is 0.82 i believe(Think) i reckon if i change this to a 0.7 poss a 0.63 then id be setup pretty gd with minimal lag. I assume you are running standard internals as you only want 0.5 boost? Alot of the other users use the GT30 and have no problems but i am unsure of the A/R's
I would of thought that A/R .48 would be abit small personally id go with 0.63 but i am no expert by far
sprinter2012
21-04-2021, 05:20 AM #3I was under the impression that using a bigger turbine would cause more turbo lag as the bigger rotational mass takes longer to spool up, rather than decreasing it?
Personally, I would use something like an evo twin scroll TD05HR-16g if you want to keep some leeway for higher horsepower. The response will be excellent on an IS200 and the standard wastegate is 8psi (~0.5 bar).
8psi on an IS200 will get you to about 240-250 horsepower in an ideal world. Also, if you're after response then get a boost controller, it will stop the wastegate creeping open as it gets to its rated boost.
You should ideally start looking at compressor maps, the amount of air flowed at 0.5 bar from one turbo will not be the same amount of air flowed at 0.5 bar from another.
My personal choice for this application would be the TD04H-19t twin scroll from the JDM legacy spec B, but they are hard to come by and you'd never see more than 300 horsepower I don't think. It would give you a fantastic graph though. Whatever you do, you are going to need a custom manifold and exhaust making. A 3" exhaust from turbo backwards will give you good exit flow as well.
el_bandido
21-04-2021, 09:19 AM #4A big compressor won't decrease spool time, it will increase it. You want the smallest rotational mass possible and the least resistance possible if you are going for response.
Personally, I would use something like an evo twin scroll TD05HR-16g if you want to keep some leeway for higher horsepower. The response will be excellent on an IS200 and the standard wastegate is 8psi (~0.5 bar).
8psi on an IS200 will get you to about 240-250 horsepower in an ideal world. Also, if you're after response then get a boost controller, it will stop the wastegate creeping open as it gets to its rated boost.
You should ideally start looking at compressor maps, the amount of air flowed at 0.5 bar from one turbo will not be the same amount of air flowed at 0.5 bar from another.
My personal choice for this application would be the TD04H-19t twin scroll from the JDM legacy spec B, but they are hard to come by and you'd never see more than 300 horsepower I don't think. It would give you a fantastic graph though. Whatever you do, you are going to need a custom manifold and exhaust making. A 3" exhaust from turbo backwards will give you good exit flow as well.
I want it to be more responsive this time, Im fed up with all my cars kicking in full boost above 5000rpm
hock: I want this is kick in 2000-3000rpm. Iv never gone with this type of setup before so im assuming a small exhaust housing matched to a big compressor housing will give me very little lag??
Thanks for all the advise guys, I not going for all out BHP yet lol!! I had an 800hp is200 last year, this time I want something abit more sensible plus I have to have boost in my life, I miss having boost even if it will be 5psi lol.
I want it to be more responsive this time, Im fed up with all my cars kicking in full boost above 5000rpm hock: I want this is kick in 2000-3000rpm. Iv never gone with this type of setup before so im assuming a small exhaust housing matched to a big compressor housing will give me very little lag??
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sprinter2012
21-04-2021, 12:01 PM #7Am I just getting my terminology wrong or what? Surely the bigger the turbine the heavier it is = More rotational mass?
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Edit: essentially, hybrid turbos exist for this reason, usually for a smaller exhaust with a larger compressor. To use an example for a turbo I suggested earlier, the TD06-20g compressor is sometimes machined to the TD05-16g hot side to get more air in and keep the emphasis on spool.
el_bandido
21-04-2021, 01:00 PM #9A large compressor will add more resistance to the spool of the exhaust side. You also need to make sure your hot side is big enough to flow sufficient gas for your engine, or you will have the wrong back pressure and actually lose performance.
Edit: essentially, hybrid turbos exist for this reason, usually for a smaller exhaust with a larger compressor. To use an example for a turbo I suggested earlier, the TD06-20g compressor is sometimes machined to the TD05-16g hot side to get more air in and keep the emphasis on spool.
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