boost question
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boost question
i was wondering if its typical for a b16 with a t3/t4 turbo to not reach full boost until 6500 rpm? im tuned and everything but just find it weird that it takes so long to hit full boost since my friends gsr is at full boost by 4000 rpm with a t3/t4 .60 trim turbo. i realize the gsr has more displacement but the fact that he can go full throttle and at least build some boost regardless of gear and i dont build any boost until about 4000 rpm just kinda makes me wonder if something is wrong or what. any input would be appreciated i have searched but havent found any definite answers
#4
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Re: boost question
No. but the tune could be also be fat (too rich) too low in the powerband. The T3/T4 you have could be too big for the b16 (Just having .60A/R doesn't mean anything. SC61s can fit in that housing). There could also be leak issues like mentioned before.
There's a lot for you to have to tackle here.
There's a lot for you to have to tackle here.
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Re: boost question
No. but the tune could be also be fat (too rich) too low in the powerband. The T3/T4 you have could be too big for the b16 (Just having .60A/R doesn't mean anything. SC61s can fit in that housing). There could also be leak issues like mentioned before.
There's a lot for you to have to tackle here.
There's a lot for you to have to tackle here.
#7
Re: boost question
Just pressurize the inlet on the turbo and check the whole system at once. It would have to be a pretty giant turbo to spool that late, even on a b16.
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Re: boost question
ok i'll try that tomorrow, the turbo is a pretty decent size, well at least the housing is anyways i was just looking at my friends ebay t3/t4 .50 trim and it looks decently larger but i know the housings dont matter in regards to the compressor wheel sizes.
#9
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Re: boost question
Ignition timing will play a big part in spooling a turbo up also. If there is little to no timing before boost it will take a while to spool. BTW I wouldn't say 13's at idle is running lean at all. Most cars should be able to idle and drive around at part throttle in the 14's. It shouldn't dip into the 12's until you get a load on the motor.
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Re: boost question
I would check for the leak first and then check timing next . . . just trying to give some options that i would try ... does definitly sound werd
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Re: boost question
need more info...what manifold, wastegate, ( internal or external ), pipe size, intercooler size... maybe a bad match up of parts.... just my 2 cents...
#12
Re: boost question
i was wondering if its typical for a b16 with a t3/t4 turbo to not reach full boost until 6500 rpm? im tuned and everything but just find it weird that it takes so long to hit full boost since my friends gsr is at full boost by 4000 rpm with a t3/t4 .60 trim turbo. i realize the gsr has more displacement but the fact that he can go full throttle and at least build some boost regardless of gear and i dont build any boost until about 4000 rpm just kinda makes me wonder if something is wrong or what. any input would be appreciated i have searched but havent found any definite answers
#13
Re: boost question
How old is the turbo? I myself would remove the inlet side of the turbo and spin the compressor wheel and check for binding and excessive axial play. Hope this helps.
Bret
Bret
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Re: boost question
Ignition timing will play a big part in spooling a turbo up also. If there is little to no timing before boost it will take a while to spool. BTW I wouldn't say 13's at idle is running lean at all. Most cars should be able to idle and drive around at part throttle in the 14's. It shouldn't dip into the 12's until you get a load on the motor.
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Re: boost question
its a meutek manifold, tial 38mm external wastegate, piping is between 2" and 2.5", and the intercooler isn't a ridiculous size either i dont remember exactly 24" wide and not very tall, i didnt have to do any cutting of the bumper or anything.
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Re: boost question
Ignition timing will play a big part in spooling a turbo up also. If there is little to no timing before boost it will take a while to spool. BTW I wouldn't say 13's at idle is running lean at all. Most cars should be able to idle and drive around at part throttle in the 14's. It shouldn't dip into the 12's until you get a load on the motor.
#18
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Re: boost question
Your manifold choice can also play a significant role in increasing lag. For example, i ran a setup with a topmount and subsequently switched to an SLS shorty. In doing so, i picked up ~50whp/50wtq and about 1100 rpm in spool. I would post the picture, but Photobucket is giving me errors atm...i'll try get it on here later
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Re: boost question
Your manifold choice can also play a significant role in increasing lag. For example, i ran a setup with a topmount and subsequently switched to an SLS shorty. In doing so, i picked up ~50whp/50wtq and about 1100 rpm in spool. I would post the picture, but Photobucket is giving me errors atm...i'll try get it on here later
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Re: boost question
its on spring only, i havent had any luck with manual boost controllers holding boost they always tend to overboost for me. before it was only boosting to 4lbs with a 6 lb spring but we got that fixed.
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