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Turbo Sizing?

50FFT

By 50FFT,
in Engines & Forced Induction

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50FFT Community Regular

50FFT

Posted
Posted

Hello All,

Just a quick question...I have heard around the traps that the smaller the exhaust housing/wheel on your car the quicker it will come onto boost. But heres my problem, I am running a GT28 BB with a GTI-R exhaust housing and my car is very laggy. I was wondering if anyone knows if, if your exhaust housing is too Small will it work the opposite way?? Thus not being able to push air through quick enough?

Thanks, Matt

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The Dan Grand Master

The Dan

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It can do but probably not in your case. That turbo is fairly big from memory. What is your turbine A/R? (it should be written somewhere on the turbo exhaust housing....usually near the dump pipe side.) What A/R is the compressor housing? What other mods do you have? And what RPM is your boost coming on full?

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Moving from QLD to Forced Induction...

ty Adrian

ok. You cant just change housings and expect things to be ok.

Now this is generalistic

The smaller the housing the less of a top end you will have.

The larger, the more top end, but lesser bottom end

The comp sizings also affect this of course.

When you say laggy... how laggy?

do you have a dyno graph?

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Banzai Parts Garage Contributor

Banzai Parts Garage

Posted
Posted

if using a gti-r rear housing this nturbo housing has a .86 a/r. unfortinutly for u there nothing really else that fits other than a nismo gtr turbo's rear housing off r32 model. but then this will not fit manfiold(in most cases) nor the dump. so yer u have a delemer. best of luck ps if u want a nismo r32 rear housing i have about hmmm 8 laying around so pm me

Mark

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