How much HP is it capable of?

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SevenMSupra

New Member
Apr 14, 2013
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Southern Oregon
Alright so I am wondering what you all think that my 1988 mk3 supra is capable of as far a HP goes. Im not necessarily looking for a exact number just a rough estimate of what it will hold. you all know Supras better then me!
Here is a list of the mods and management systems:
JDM 7MGTE
Wiseco forged internals (pistons and rods) rods might be eagle? cant recall.
stock crank i believe
ARP headstuds
cometic MHG
stock cams
custom intake plenum
120mm accufab throttle body
750cc injectors
temporary (ebay version) Garrett Gt35r? replica turbo or something like that?
external wastegate (forget the brand)
3.5" intercooler piping
hks sequential bov
high flow fuel pump i cant think of the brand right now
adjustable FPR with gauge
3.5" turbo back straight pipe exhaust to a magnaflow muffler
forgot the brand of the fmic
rev limiter set at 6k
HKS fuel cut eliminator
Maf delete, converted to speed density with the HKS stuff mentioned below.
All running off of a stock A/T ECU piggybacked to a HKS VPC system and an HKS GCC. (Standalone coming once I get the extra cash!)
Aem wideband and all the other gauges necessary
I am sure there is a heck ton more that im not thinking of right now but thats the basics.

I ran it on the local track but it was running way to rich. it turns out it has the wrong injector chip in the vpc its set up for stock injectors.
I was running it at 18 psi. it is built to hold alot more. i ran it on 25psi for a few laps and it had no trouble holding the boost at all, but like I said its running very rich as in 10.0 or less so i got black smoke, backfires, and of course power loss.
I like the VPC and GCC units they work pretty well for fine tuning but i have plans for a standalone.
Anybody know what kind of hp i should expect out of this setup?
lets say I set the AFRs to 11.0 and I run 22psi of boost.
Thank you for your input.
Here is a few pictures of the engine.
DSCF2027DE.jpgDSCF2028DE.jpg
 
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IndigoMKII

IndigoMKII

New Member
May 9, 2011
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Madison, Virginia
Wouldn't be able to reply with a decent guess without knowing the fuel and the a/r of the ebay turbo. Which GT35R is it? Is it the GT3576R or the GT3582R?

There's too much information missing to give a decent guess.
 
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SevenMSupra

New Member
Apr 14, 2013
18
0
0
Southern Oregon
IndigoMKII;1935194 said:
Wouldn't be able to reply with a decent guess without knowing the fuel and the a/r of the ebay turbo. Which GT35R is it? Is it the GT3576R or the GT3582R?
Click to expand...
I have no idea which turbo it is? its all unmarked unfortunately.
 
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SevenMSupra

New Member
Apr 14, 2013
18
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0
Southern Oregon
I was running on the local auto cross track not drag and there was no timing gear set up at the time.
for fuel I am running 92 octane then adding a bit of octane booster.
 
MarkIII4Me

MarkIII4Me

Project OVERKILL!!!
Apr 10, 2005
1,249
2
38
Charleston, SC
^
Agreed. This thread has bs written all over it. 750cc injectors with a 440cc chipped VPC (pretty sure the most that can be tuned for is 660cc injectors w/ a 550cc chip) and a GCC. Super low a/f at 25psi on pump gas? I don't get it. OP must be confused. Maybe boost gauge isn't working correctly. The mods were obviously performed by the previous owner. I'm sure he could answer the OP's questions better than any of us.
 
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BryanDyer

New Member
Jun 13, 2012
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Georgia
yeah I agree I'm just taking a guestimate at the power he could reach but he needs to some things before he gets there
until then I wouldn't be boosting especially at 25 psi on pumps gas which isn't realistic or else something major is going to go wrong
with bad a/f ratios boosting isn't a good idea
 
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SevenMSupra

New Member
Apr 14, 2013
18
0
0
Southern Oregon
Sorry no bs here. that's all correct. boost gauge works fine. I ran pump gas with octane booster at 25psi. i had set the boost to 15 and it over boosted to 25 but had safe RICH air fuel ratios at below 10.0 and sounded fine. i was in the middle of a 3 lap run so i let it run but was careful (no full throttle) I just pointed that fact out to allow people to understand that it is capable of 25psi and nothing blew up or pulled apart. the vpc chip is incorrect and the injectors are to big and magically it still ran! not quite sure how it ran and still pulled hard on those settings but it doesn't matter, it did. I have the engine pretty much dissembled right now because (unfortunately) yes the previous owner did the modifications and although the parts may be decent quality i never trust anybody else when its my car on the line. so worry not it will have new 550 or so injectors,the other vpc chip, and i will figure out the fuel too before it is driving again!
I am just wondering what kind of power it will be capable of once i reassemble it and have it tuned properly. and I might have the ebay turbo swapped out by then to.
Thanks for your input guys.
 
IndigoMKII

IndigoMKII

New Member
May 9, 2011
2,181
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Madison, Virginia
Sorry but that's why I find these types of threads absolute bullshit to even respond to. You've left so many variables out and you're even talking of further messing with the setup.

Instead of wondering what your setup will put out in horsepower figures and you don't feel like paying for a dyno, run it on a track and post the MPH. We can give you a better estimate off of that, at least it's a solid number.
 
7M4EVR

7M4EVR

New Member
Oct 8, 2012
695
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fah, fah away
Well damn what you have there is a car, one in a million... put it back together, crank that shit up to 45 psi and tell US how much power it puts out!
 
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