7M-GE to 7M-GTE swap help

k0170n · 08-17-2011, 02:38 AM

Alright, so you do suggest running the GTE harness on the GTE engine? (Duh) lol but will I run into any problems like extra wires, or wires I need to solder into the ECU due to the body requiring them? Or will I just be able to disconnect all of the GE's harness, swap the engine and ECU, then just reconnect all of the GTE harness to the GTE engine?

k0170n · 08-17-2011, 02:40 AM

Just coming from a Subaru guy who found out that swapping EJ engines is a pain in the ass, because you have to splice and solder a shit load of wires to a new ECU... I was just hoping that Toyota had the light at the end of the tunnel and it was loads easier

907mge · 08-17-2011, 03:08 AM

A 7mgte harness should connect right up to a 7mgte. I would think cutting up a harness and redoing it would be far harder than just switching it out. Also a 7mge has a distr. while the 7mgte uses coil packs which alone will make the harness different.

MJG · 08-17-2011, 03:10 AM

Light at the end of a tunnel? You must be dead or an engineer.

k0170n · 08-17-2011, 03:39 AM

That shouldn't be a problem though if I'm taking the whole engine and a few parts into a new car though? Just put in the ignition coils from the GTE into the GE shell with the GTE harness. This will be the first engine swap on a Toyota I will do, I have done many Hondas and a Subaru...

btwilson86 · 08-17-2011, 04:48 AM

Swap out the engines. Leave the harness on the engine when you remove it, you can push the ecu plugs into the engine bay fairly easily. Swap out the ECU's. Swap out the gauge clusters (so your tach works and you have a boost gauge). I'm told the dash wiring harnesses are the same from similar year Supras (pre89 and post89; you will want to verify that). Swap the stuff out that's on the fenders (some parts are different).

That should pretty much cover the basics in the swap, although I haven't actually done it myself (helped someone else do it though)

cre · 08-17-2011, 06:14 AM

As you're already swapping the interiors (I assume this means the dash) then swap the dash harness with it... No muss, no fuss. You could have the cleanest possible swap out there if you take your time and compare and swap what's different. There's nothing easier than a COMPLETE swap from an already intact and functioning vehicle. Light at the end of the tunnel.

Otherwise I do believe some of the dash harness wiring will need to be modified (just a few wires, but I can't recall what).

08-17-2011, 04:48 AM	#6
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Swap out the engines. Leave the harness on the engine when you remove it, you can push the ecu plugs into the engine bay fairly easily. Swap out the ECU's. Swap out the gauge clusters (so your tach works and you have a boost gauge). I'm told the dash wiring harnesses are the same from similar year Supras (pre89 and post89; you will want to verify that). Swap the stuff out that's on the fenders (some parts are different). That should pretty much cover the basics in the swap, although I haven't actually done it myself (helped someone else do it though) __________________ 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

08-17-2011, 06:14 AM	#7
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	As you're already swapping the interiors (I assume this means the dash) then swap the dash harness with it... No muss, no fuss. You could have the cleanest possible swap out there if you take your time and compare and swap what's different. There's nothing easier than a COMPLETE swap from an already intact and functioning vehicle. Light at the end of the tunnel. Otherwise I do believe some of the dash harness wiring will need to be modified (just a few wires, but I can't recall what). __________________ 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 --->

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08-17-2011, 02:38 AM	#1
k0170n Stock Join Date: Aug 2011 Location: Utah Posts: 5	Alright, so you do suggest running the GTE harness on the GTE engine? (Duh) lol but will I run into any problems like extra wires, or wires I need to solder into the ECU due to the body requiring them? Or will I just be able to disconnect all of the GE's harness, swap the engine and ECU, then just reconnect all of the GTE harness to the GTE engine?

08-17-2011, 02:40 AM	#2
k0170n Stock Join Date: Aug 2011 Location: Utah Posts: 5	Just coming from a Subaru guy who found out that swapping EJ engines is a pain in the ass, because you have to splice and solder a shit load of wires to a new ECU... I was just hoping that Toyota had the light at the end of the tunnel and it was loads easier

08-17-2011, 03:08 AM	#3
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	A 7mgte harness should connect right up to a 7mgte. I would think cutting up a harness and redoing it would be far harder than just switching it out. Also a 7mge has a distr. while the 7mgte uses coil packs which alone will make the harness different.

08-17-2011, 03:10 AM	#4
MJG 3" Exhaust Join Date: Mar 2010 Location: Washington State Posts: 125	Light at the end of a tunnel? You must be dead or an engineer.

08-17-2011, 03:39 AM	#5
k0170n Stock Join Date: Aug 2011 Location: Utah Posts: 5	That shouldn't be a problem though if I'm taking the whole engine and a few parts into a new car though? Just put in the ignition coils from the GTE into the GE shell with the GTE harness. This will be the first engine swap on a Toyota I will do, I have done many Hondas and a Subaru...