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Discussion Starter · #1 · (Edited)
Running 94 NA with custom TT setup. Both turbos are T3 T58's with .50 intake and .48 exhaust

I want to install a HKS VPC, GCC combo and use my 750cc injectors with a Walbro. No cams or engine work, only looking for 15psi


HKS offers a few chips :

21200-JZA8018A
TOYOTA Supra 1993-1998 Turbo ; 6-Speed w/Stock Injectors

21200-JZA2835D
TOYOTA Supra 1993-1998 Turbo ; 680 Injectors, GT2835 Turbo Upgrade & In-Tank Fuel Pump

21200-JZA8018B
TOYOTA Supra 1993-1998 Turbo ; 680 Injectors, Single Turbo Upgrade & In-Tank Fuel Pump

21200-JZA8018C
TOYOTA Supra 1993-1998 Turbo ; 680 Injectors, Single Turbo Upgrade, HKS Cams & In-Tank Fuel Pump

21200-JZA8018AT
TOYOTA Supra 1993-1998 Turbo ; Automatic w/Stock Injectors




I have read that there are VPC users with 1000cc running with the B chips with no issues, so my take is that i should be able to run my 750cc with no problems either...but the B chip seems to be for a single upgrade.

Should I be able to run the GT2835 chip fine or just stay with the standard B chip??


Thanx for the input
 

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You want to run the B chip and swap out the GCC (very old school) for a better fuel controlling option like an Apexi SAFC which has far more fine tuning capabilities. Not that the GCC won't work. Better yet, dump the VPC and go for the AEM ECU but that will cost you more but give you a ton more options to control things.
 

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Discussion Starter · #3 ·
Yea I know about the AEM and all. The VPC isnt a long term solution...just a "Get up and running now" solution.

AEM will be the final thing, I just got a VPC/GCC for next to nothing.


Thanx for the info....anyone else??
 

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I would say stick with the "B" chip even though you have twins. I currently run on vpc/gcc with a "B" chip. My previous turbo was a G42r, 1000cc injectors, it ran great when i didnt have cams on that chip and after HKS 272's were installed it ran perfectly. My current set up is a pair of t-3's super 60's, with cams, 1000cc injectors it still runs great.

Lawrence
 

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WhiteBlazze said:
I have read that there are VPC users with 1000cc running with the B chips with no issues, so my take is that i should be able to run my 750cc with no problems either...but the B chip seems to be for a single upgrade.

Thanx for the input
Not entirely true. With 1000cc injectors you will run ULTRA FAT with VPC at anything under 4500rpm....and there is almost no way of fixing it. 750cc is perfect for VPC chip B or C. If I were you I would try D chip, since you are running twins.
 

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Discussion Starter · #6 ·
well...I meant VPC/GCC users running 1000cc with no issues on the B chip
 

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They are all still super rich under 4500rpm, there is no cure for that since VPC chips are programmed for max 720cc (optimum fuel), so using 1 liter injectors will run rich - period. since you have something similar to HKS twins, try that chip, I think it will work great.
 
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