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-   -   how high can you go? (http://www.toyota-supra.info/forums/mkiii-supra/9163-how-high-can-you-go.html)

hkssupra 07-27-2007 01:26 AM

how high can you go?
 
hello everyone, new to forum, i have a 87 supra that i have been working on for quite a while now, i just recently drove it for the first time and when i hit full boost, i was only at 5-6 lbs. the car has a manual bc, do you think possibly it could be bad? i had it turned up to about 10-15 lbs, i know its not my charge pipes or vacuum leaks so this is the only thing left i can think of. Also i was wondering how high i can boost safely. the car has- hks f-con,fcd, stock pipes and intercooler, hks bov, and straight threw exhaust(hollow cats) and greddy muffler. what psi do you think ill be safe running? any help is appreciated..thanks

rocktownsupra21 07-27-2007 02:31 AM

10 psi
 
i wouldnt run any higher than 10 or 11 on the stock turbo

hkssupra 07-27-2007 11:12 PM

that sounds good to me, i dont want to fry that turbo. i have herd that you can upgrade the stock turbo, has anyone done this? im not sure what the stock trim is but what could you upgrade to?

west_side_supra 07-28-2007 12:04 AM

uh if i remember right it the stock trim to a GT trim they have the trims availible on ebay just look around, search for ct-26 maby

Supra2NR 07-28-2007 12:22 AM

10-15 lbs?
ddnt hit fuel cut?

i think u could have fried that turbo already, hopefully it was still in good shape
when you turned up the boost

my stock turbo gave up on me at 15 psi

hkssupra 07-28-2007 05:16 PM

ill search ebay tonight and see what i can find, and i havent had it up past 6 psi yet cause i think i my mbc is bad, it was cut up but still hit stock boost, i think im going to take it out and just shim the wastegate, and as for the fuel cut, i have the hks f-con and fuel cut defender, so i dont think i need to worry about fuel

dcrusupra 07-28-2007 06:26 PM

Quote:

Originally Posted by hkssupra
ill search ebay tonight and see what i can find, and i havent had it up past 6 psi yet cause i think i my mbc is bad, it was cut up but still hit stock boost, i think im going to take it out and just shim the wastegate, and as for the fuel cut, i have the hks f-con and fuel cut defender, so i dont think i need to worry about fuel

Fuel cut is there for a reason. If you are still on the stock fuel set-up you might want to keep fuel cut there.


The most my engine has seen is 10-11 psi. Shortly after I blew the coupler on my 3000 pipe to throttle body. Now it's back at 8 psi.

hkssupra 07-28-2007 11:14 PM

thanks for the info, i plan on keeping the fcd on it, but im not going above 10-11 psi, and if i do start blowing charge pipes, ill have to back it down, untill i get the hard pipe kit

Supra2NR 07-29-2007 04:24 AM

Quote:

Originally Posted by hkssupra
thanks for the info, i plan on keeping the fcd on it, but im not going above 10-11 psi, and if i do start blowing charge pipes, ill have to back it down, untill i get the hard pipe kit

although i was running a little richer than i preffered,
i was fine a 12 psi, when my car was stock,
til my friggin clutch gave out on me,
then i turned the boost down to 10 psi

jus get a walbro 255lph fuel pump, and a aeromotive fuel pressure regulator
you can still stretch out the injector to compensate for the extra boost
and the pump and regulator, you can adjust if needed

supradrift 07-29-2007 05:24 AM

i have 550s and a lexus afm if i get a fuel pressure regulator i know i can safely turn my boost up but what do you need to do about the fuel cut? does anybody know


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