How much better is the performance at low RPM (2000-4000)? And is it more powerfull than a BPU with a HKS-EZ boost controller? I do not have a boost controller on my car yet, Im thinking of trying this mod what can I expect?
94-TT Silver 6 speed
HKS 'Priest' exhaust
HKS down pipe
Sard R2D2 blow off valve
Greddy Turbo Timer
17" Racing Hart Wheels
I have recently corresponded with Chris from HPF about the boost mod:
> >Would I benefit from this mod if run with the following setup?
> >K&N intake
> >Greddy type R bov
> >HKS exhaust cam
> >TurboXS mbc
> >Greddy PE exhaust
> >SP downpipe
> >Greddy BCC
> >RPS stage 2 clutch
> >TTC mod
> >EGR mod
You'll pick up about 30-40 rwhp. You'll want to put your turbos back in sequential. After you do that you will wonder why the heck you had them in parallel anyway.
I have this mod on over 30 Supras, none have had their turbo's fail yet. That's probably around 70 years of cummulative driving with the mod without a failure.
Most people get 325-350 rwhp on the 1st turbo at 3,000rpm. Then a quicker spooling 2nd turbo and more power through to around 7,000rpm. Try it. If you don't like it, switch it back.
I have the stock BOV and no you don't need a boost controller. In 5th and 6th gears, watch out as boost will climb VERY rapidly into the upper 20psi range on the 1st turbo. You'll learn to control boost with your foot It sounds scary at first but it really is great once you get used to it. Good luck!
Isnt this mod the same as pulling the hose to the turbo?From what I see its eliminating the VSV which can also be done with pulled hoses and vacuum caps.I see the same boost as above with the pulled hose mod.
Hey one more thing Chris, Does this mod give a lot better performance than if I were to run a Profec-B boost controller? Also what are the drawbacks with HPF mod?
A lot for guys on the HPF site have FMIC on their car do I need one? What about a boost guage?
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1994 Single Turbo 6sp, 139K miles
stock fuel pump
12 volt fuel mod
All graphs below are second gear.
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