1991 7MGTE to 1987 7MGTE

btwilson86 · 07-07-2010, 06:53 PM

Did they swap anything else over from the 87 Supra? Such as the fuel injector resistor packs on the firewall? I'm assuming that since the 87 harness is still connected that they kept the 87 fuel injectors and fuel rail...

If I was in your situation, I'd get the fuel injectors and wire harness from a 89+ turbo supra. That way the factory gauges will operate properly and it should just be plug and play. If a wire harness is hard to find, you can get a 87 ECU, 87-88 Gauge cluster + dash harness, the resistor packs for the fuel injectors, and maybe some other odds and ends to get it running right.

I'm sure it's possible to rewire the connectors on the wiring harness to make it connect to the ECU properly, but you will still need to address the fuel injectors. pre89 7MGTE's use low impedance injectors, whereas 89+ used high impedance injectors (I think that's right, might be the other way around though; trying to recall from memory).

Anyway, help this gets you pointed in the right direction.

batmmannn · 07-07-2010, 06:59 PM

Sounds like a real headache, Glad I'm not attempting it. By the time I had it figured out and picked enough brains I would have wasted more time than the car was worth.... But that's just me.

cre · 07-08-2010, 02:55 AM

All years 7M-GTE used low impedance injectors. Only 7M-GE's saw that change.

blake · 08-03-2010, 02:32 AM

i have a 91 supra and it is a na, and im at the same problem, well im building it. i bought an 88 supra and i found out the harness is different and all. if u can what u figure out post so i can go over the info so i can then save time myself.. i know it is a pain in the rear...

Supra Saiyan · 08-03-2010, 02:40 AM

http://www.4cefed.com/conversion.html

Green7mgte · 08-03-2010, 02:42 AM

god thats the 5th time i seen that link end a thread..

Supra Saiyan · 08-03-2010, 02:45 AM

Thought blake would need it so don't go buying stuff that's not compatible with one of his 2 supras..

lol, that's funny you have seen the link ho'd out like that..

07-07-2010, 06:53 PM	#1
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Did they swap anything else over from the 87 Supra? Such as the fuel injector resistor packs on the firewall? I'm assuming that since the 87 harness is still connected that they kept the 87 fuel injectors and fuel rail... If I was in your situation, I'd get the fuel injectors and wire harness from a 89+ turbo supra. That way the factory gauges will operate properly and it should just be plug and play. If a wire harness is hard to find, you can get a 87 ECU, 87-88 Gauge cluster + dash harness, the resistor packs for the fuel injectors, and maybe some other odds and ends to get it running right. I'm sure it's possible to rewire the connectors on the wiring harness to make it connect to the ECU properly, but you will still need to address the fuel injectors. pre89 7MGTE's use low impedance injectors, whereas 89+ used high impedance injectors (I think that's right, might be the other way around though; trying to recall from memory). Anyway, help this gets you pointed in the right direction. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

07-07-2010, 06:59 PM	#2
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Unnngh Sounds like a real headache, Glad I'm not attempting it. By the time I had it figured out and picked enough brains I would have wasted more time than the car was worth.... But that's just me. __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile!

07-08-2010, 02:55 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	All years 7M-GTE used low impedance injectors. Only 7M-GE's saw that change. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

08-03-2010, 02:32 AM	#4
blake Stock Join Date: Jun 2009 Location: loxley, al Posts: 16	same project i have a 91 supra and it is a na, and im at the same problem, well im building it. i bought an 88 supra and i found out the harness is different and all. if u can what u figure out post so i can go over the info so i can then save time myself.. i know it is a pain in the rear...

08-03-2010, 02:42 AM	#6
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	god thats the 5th time i seen that link end a thread.. __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

08-03-2010, 02:40 AM	#5
Supra Saiyan 3" Exhaust Join Date: Feb 2010 Location: Oregon Posts: 225	http://www.4cefed.com/conversion.html

08-03-2010, 02:45 AM	#7
Supra Saiyan 3" Exhaust Join Date: Feb 2010 Location: Oregon Posts: 225	Thought blake would need it so don't go buying stuff that's not compatible with one of his 2 supras.. lol, that's funny you have seen the link ho'd out like that..

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