my 98 supra tt in need of help

[pwpanas]

Originally Posted by mandil23

i have a 1998 supra tt that has been highly modded. The car will not start the car is getting a 50 psi the injectors are not sprayn, ever since i swaped from 850cc to 450 cc. so i have tried to reprogram the aftermarket computer for 450cc injectors but im having problems with that because the car has autroinc computer that flashes a red light then goes off so i thought its not getting power but it test out fine. but when i plug it to my laptop it says short circut in a datalink cable. i bought another serial db9 to usb same problem and my car will not start and i have spent alot i mean alot of money on this car and it dosent run i need help and bad please if you know anything let me know.i will post pics as soon as i can.

Is your 98TT JDM-spec (rhd)? If not (i.e. if it is US-spec), you should be using 550cc injectors (not 440s). That could be one of the problems...

[mandil23]

Originally Posted by pwpanas

Is your 98TT JDM-spec (rhd)? If not (i.e. if it is US-spec), you should be using 550cc injectors (not 440s). That could be one of the problems...

jdm i have pics in my album of it iam getting one for the motor but i looked at the computer on it and the redlight is flashes when u try to crank the car but it goes off so im thinking it a wiring issue but idk yet

[pwpanas]

Originally Posted by mandil23

jdm i have pics in my album of it iam getting one for the motor but i looked at the computer on it and the redlight is flashes when u try to crank the car but it goes off so im thinking it a wiring issue but idk yet

Your situation is somewhat unique due to your standalone (Autronic) ecu. I'm extremely confident in my recommendation that you need to get in touch with Autronic to help with the diagnosis. For example, if you've already tried two different USB/serical cables, and you know your laptop is not the problem, then it's likely your ecu has an issue.

As a reference, I'm also running an aftermarket, 'standalone' ecu in my Mkiv TT (an AEM). Before that I ran a Haltech. I've worked on several other Mkiv TTs with standalone ecus. Fortunately or unfortunately (depending on how you look at it) I've had to become intimately familiar with these types of issues.

[mandil23]

ok got off the phone with them they think my computer usb port is too fast to comunicate with the car idk man im about to cruch this car ive been waiting for a whole yr to get this car running

[pwpanas]

Originally Posted by mandil23

ok got off the phone with them they think my computer usb port is too fast to comunicate with the car idk man im about to cruch this car ive been waiting for a whole yr to get this car running

If you want rock-solid reliability and don't want to mess with a standalone ecu, just put a stock Toyota ecu back into it!

Regarding the "usb port too fast" excuse, just try it with a different (older) computer. If you can duplicate the problem with another computer, the problem is definitely in the ecu (and not with the computer).

[mandil23]

i wish i can do that i have almost 70,000 invested in this car from labor to parts tried another on apprently my 5 cables i have for this car are bad!! idk what to do i feel like crushing this thing lol

[pwpanas]

Originally Posted by mandil23

i wish i can do that i have almost 70,000 invested in this car from labor to parts tried another on apprently my 5 cables i have for this car are bad!! idk what to do i feel like crushing this thing lol

Do you mean USB cables? Again, you need to try it with another computer, not another cable. If the ecu won't talk to a different computer, then the ecu is bad. My advice (primarily based on your frustration level) is to get a bone-stock ecu and get rid of the Autronic. Standalone ecu's are only for someone with either deep pockets (to pay installers/tuners) or someone with a lot of patience, time and expertise.