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Old 06-26-2006, 04:57 PM   #1
Magical Trevor
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Default Questions about the oem fuel system

New here with some questions...

A little background on me and my car, I've owned 1 turbo car, and that's my WS6. I basically had to learn everything that I could about the forced induction world through trial and error, that being said it's got a 402ci (6.6L) stroker and a PT88 with all the suporting mods making a little over 920/900 on 20psi.

I've done as much searching as I could and I couldn't come up with some solid answers.

From what I've read the stock bottom end is extremely durable and that might be an understatement, I've also read that the stock twins are good for around 550-600rwhp.. or I might be a little off?

My main concern is the fuel system, at what RWHP do you need to start worrying about the fuel pump/lines/injectors/rails? Also about what psi (I know psi is relative, but I don't know how well the 2JZ's flow compared the the LS1's) can the stock fuel system take with 91-93 octane?

Sorry for all the questions, just trying to do some research and gain some knowledge before I go out and buy a Supra. (BTW I got my first ride in a supra. My friend has a t78 single and I was more than impressed!)

-Trevor
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Old 06-27-2006, 03:03 AM   #2
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No one knows?
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Old 06-27-2006, 10:09 AM   #3
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Quote:
Originally Posted by Magical Trevor
New here with some questions...

A little background on me and my car, I've owned 1 turbo car, and that's my WS6. I basically had to learn everything that I could about the forced induction world through trial and error, that being said it's got a 402ci (6.6L) stroker and a PT88 with all the suporting mods making a little over 920/900 on 20psi.

I've done as much searching as I could and I couldn't come up with some solid answers.

From what I've read the stock bottom end is extremely durable and that might be an understatement, I've also read that the stock twins are good for around 550-600rwhp.. or I might be a little off?
That's a little off. The stock twins are good for about 375rwhp-485rwhp, depending on whether you're running an auto or 6spd...and the current state of the turbos & engine (i.e. wear & tear, mileage, maintenance, etc.).
Quote:
Originally Posted by Magical Trevor
My main concern is the fuel system, at what RWHP do you need to start worrying about the fuel pump/lines/injectors/rails? Also about what psi (I know psi is relative, but I don't know how well the 2JZ's flow compared the the LS1's) can the stock fuel system take with 91-93 octane?
If you get the injectors cleaned and flow balanced, with a brand-new fuel pump, the oem fuel system is good for about 550rwhp (absoluate max) through a 6spd, or 515rwhp through an auto.

You'll also need to run race fuel or meth injection for any boost level above 16psi on 93 octane. This is not dependent on the fuel system...it's dependent on the oem ecu's timing curve and a simple boost vs. octane caculation. In other words, even if you had 1000cc injectors installed, you still wouldn't be able to boost more than 16psi on 93 octane pump gas.

P.S. I only check the forums about once a day, so please bear with me if I don't respond immediately. You can also try emailing me at pwpanas@comcast.net.
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NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.

Last edited by pwpanas; 08-21-2007 at 02:56 AM.
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Old 06-27-2006, 01:10 PM   #4
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Thanks man, you answered everything I needed to know. If I have any other questions I'll shoot you an email...
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Old 08-19-2007, 02:22 PM   #5
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Default J Spec Supra

Hello Guys, i am new here and i am new with my 94 supra. i am having a problem with starting the car, i was troubleshooting and i found the fuel pump not working, i conected it direct and the car started nicley, one more thing 5 day before the problem the car dosent go after 3000 rpm today after i connected the pump directly it was exellent.. so please can you guys send me the wiring digram for a 94 supra j spec. thank you.
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Old 08-19-2007, 04:39 PM   #6
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hello, can i get the wiring digram for the fuel pump mkIV supra please. thank you
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Old 08-19-2007, 04:49 PM   #7
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Quote:
Originally Posted by bahsupra
hello, can i get the wiring digram for the fuel pump mkIV supra please. thank you
Yep, you can get that and all other wiring diagrams for the car in the TSRMs. Here's an electronic version, but it's only there as a 'teaser' to encourage you to purchase the paper copy (along with the other TSRMs (engine, chassis) that you should have handy whenever you work on your Supra):
http://www.mkiv.com/manual/1995_elec...ual/index.html
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Displacement is no replacement for boost.
Life begins at 30psi.


NB: Please consider posting any help requests in a new thread instead of asking me for help privately. About 99.9+% of the time, private help requests end up covering great information that could be very valuable to other forum members. If you have a good reason for needing the help request to be private, I'll consider it. If not, then why not give everyone else the opportunity to pitch in too, and/or learn from the information? Remember, there's no such thing as a dumb question. We're all here to help within this family of Supra owners.

Last edited by pwpanas; 08-19-2007 at 05:01 PM.
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Old 08-19-2007, 05:40 PM   #8
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Thanks alot.....
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