[jwhalen355]

Hello all, any input on this project would be greatly appreciated... I purchased a 93.5 NA/T auto Supra and I am converting it to a Single 6 speed. The car is basically gutted, i removed everything (stock motor, auto, subframes, wiring harness(s), etc...). I cut nothing, everything was pulled exactly as it went together. I have a JDM TT motor and 6 speed getrag that i bought for it and i plan to do standalone engine management and a Precision 6765 Single. I am sending the motor out to get freshened up with cams and some other happy jazz. My questions are (1) The wiring harness on the JDM unit is cut, not on the ECM connectors, but on the connectors that i assume handle dash stuff and misc. controls. The NA/T harness is set up for distributor ignition, no turbos, etc.. obviously, the JDM motor is fairly new with coil pack ignition, turbo stuff, blah blah blah... What is the best way to control the new motor and handle auxillary stuffs, considering it will have the big single and and a motor out of a much newer car??? (2) Can I build the NA differential to deal with the power??? or do i have to find a 6 speed diff??? (3) Can i use one high output fuel pump or will I starve the engine for fuel at high rpm/boost circumstances??? Sorry about the essay of questions, I'm sure i'll have some more particular questions as I go along, any and all help is welcome, Thanks again!!!

 

[Ryeno]

1) Where exactly is your TT harness cut? Are the body plugs there? fuse box plugs? The igniter & noise filter plugs?
2) Cheap option is to get a junkyard gs400 differential and shove a TRD LSD in it. Better option is to actually buy a TT 6SPD diff, maybe add a TRD LSD to it as well.
2) Twin OEM Denso fuel pumps (about 200 a piece on Amazon) have worked well for a lot people seeking pump gas power.

 

[jwhalen355]

Its cut on the fuse box wiring, all of it. No body plugs, no nothing. Just the three terminals that connect the ECU. I have the stock NA harness and i was even thinking of spliting that to work with the JDM harness. What to do? Do i buy an aftermarket harness and controller like the Haltech? Still dosent solve my fusebox and body plug issue. Do I just buy a new harness? Do I work with what i have? Thoughts?

The differential I think I may buy from this guy down in texas, he has been really straight foward and easy to deal with. Its just a matter of finding one.

The twin denso setup seems to be common, however i found a supra specific fuel pump that will churn 510 LPH with no voltage regulator. My thought was to increase the fuel line size, rail, filter and of coarse 1000cc injectors. I would have volume and pressure. I just havent seen it done. Im not opposed to twin fuel pumps I was just tryng to simplify. One thing is for sure i dont want an inline pump, they run too hot and loud. What are your thoughts??? Thanks for the help!

 

[jwhalen355]

Btw have you done an NA/T conversion before?

 

[Ryeno]

A new harness is around 1200 dollars and even then it needs to be slightly modified to work with the JDM engine.

How well do you solder? Standard non VVT-i engine right?

What I would do is depin & cut the majority of GE plugs from the GE harness like fuel injectors, distributor, etc. That way your left with a harness thats complete from the ECU plugs / body plugs location to the long plastic shielding along the firewall. From there it would have the fusebox plugs uncut (besides the portion to the A/C), knock sensor wires and you'd also keep the white noise filter plug from the GE harness. From here on you combine the two harnesses so the solder joints are hidden into the long plastic shielding. You'll need shielded wire for the cam and crank sensors. Finally buy and graft the two missing TT igniter plugs along with the noise filter plug you took off the GE harness. Along the way you'll need to reconfigure some of the pins on the ECU and replace any broken plugs.

It's not hard but it's a bit time consuming and you better be good at soldering. I can do it for you if you want.

I'm doing a 2JZ-GE 5SPD to 2JZ-GTE VVT-i 6SPD swap on my car.

 

[twinturbosupra94]

1) Where exactly is your TT harness cut? Are the body plugs there? fuse box plugs? The igniter & noise filter plugs?
2) Cheap option is to get a junkyard gs400 differential and shove a TRD LSD in it. Better option is to actually buy a TT 6SPD diff, maybe add a TRD LSD to it as well.
2) Twin OEM Denso fuel pumps (about 200 a piece on Amazon) have worked well for a lot people seeking pump gas power.

:lol: Now I see you are recommending people to get a GS400 rear end. I thought that was cutting corners? Oh and the TRD diff inside a GS400 diff is just as strong as a TRD diff inside of a TT 6 speed diff unless you are going above 1000hp. At that point, you will need to be running custom things anyways.

To be honest, twin densos will be good for about 800-900hp depending on what you run. If you plan on running E85, I would just sump your stock tank and run a weldon. Very reliable and will flow everything you need period. Thats what I plan to do. Sure the Densos are reliable but I don't like the idea of running lean in the event one of them fails.

As for the harness, you don't have to cut anything. You can just re-pin everything you need. Essentially, you are going to use the Aristo 2JZGTE harness for the majority of the swap. The GE harness will handle the body plugs and power from the fuse box. If you don't want to do it yourself, let Dr. Tweak do it, he is a professional. You don't need crappy soldering points or you will be sorry later. Send me a PM and I will give you a diagram that I have or I can post it up here. Credit goes to the guy over at clublexus/clubna-t (a.k.a. the cheap asses).

If you have anymore questions, hit me up. I have done several NA-T setups and NA to TT conversions. To be honest, if you were going big single, it would have been easier and more cost effective to build the GE motor that you have. You could have had a fully built motor running a nice standalone for the price of that swap, factoring in you could have pieced together a 6 speed swap reasonably.

 

[Ryeno]

:lol: Now I see you are recommending people to get a GS400 rear end. I thought that was cutting corners?

I'm just giving information and yes it is cutting corners but people can make up there owns minds what they want to do. I'm not lying or spreading false information like...

Oh and the TRD diff inside a GS400 diff is just as strong as a TRD diff inside of a TT 6 speed diff unless you are going above 1000hp.

this

As for the harness, you don't have to cut anything. You can just re-pin everything you need. Essentially, you are going to use the Aristo 2JZGTE harness for the majority of the swap. The GE harness will handle the body plugs and power from the fuse box. If you don't want to do it yourself, let Dr. Tweak do it, he is a professional. You don't need crappy soldering points or you will be sorry later. Send me a PM and I will give you a diagram that I have or I can post it up here. Credit goes to the guy over at clublexus/clubna-t (a.k.a. the cheap asses).

You shouldn't talk about stuff you haven't done.

First he has a Supra harness, not an Aristo one.
Second you HAVE to solder because of the different wiring routes between the GE and GTE, stuff like oil level light, fuel injectors, ignition system just to name a few and the fact that his Supra harness is missing the igniter plugs.
Third (aristo v ge.xls and japsepcpinouts.jpg) are just pinouts, they don't tell you when you should depin or where you should cut. It's an art to doing the harness right.

 

[twinturbosupra94]

I'm just giving information and yes it is cutting corners but people can make up there owns minds what they want to do. I'm not lying or spreading false information like...


this




You shouldn't talk about stuff you haven't done.

First he has a Supra harness, not an Aristo one.
Second you HAVE to solder because of the different wiring routes between the GE and GTE, stuff like oil level light, fuel injectors, ignition system just to name a few and the fact that his Supra harness is missing the igniter plugs.
Third (aristo v ge.xls and japsepcpinouts.jpg) are just pinouts, they don't tell you when you should depin or where you should cut. It's an art to doing the harness right.

:lol: At stuff I haven't done. You don't think I had to build my harness when swapping in my TT engine that I built? :lol: There is no fucking art to making a harness man. Stop talking like you are jesus and swapping the TT motor is complicated. Here is the pinout sheet. Now where does he say in his first post he has a JDM Supra Harness?

 

[Ryeno]

:Now where does he say in his first post he has a JDM Supra Harness?

Aristos don't come with 6 speed getrags.

 

[jwhalen355]

Whoa fellas lets not fight, great info though. Moral of the story is I picked up the car, motor, and tranny for a reasonable price. Ive been restoring cars since i was 17 and I dont know why but I never liked cars that were already nice... I always vouched for the one that got hit by the cement mixer, I'm doing a full restoration on this Supra. Ultimatley I could combine these two harnesses to work with the car, do you have any more wiring diagrams I can stare at? I would have no problem disecting the harness... and I guess if I fuck it up Ill need help from the pros. Btw motor is going out this week for cams, springs, retainers, and head studs... Sweet

 

[Ryeno]

download the 95 supra repair manual, it has all the wiring diagrams.

 

[jwhalen355]

Awesome, thank you much.

 

[ReganECR33]

if your goin straight for an stand alone buy a flying lead kit soo much easier like my haltech ps2k came with relay's fuses everything and every wire came labled for example ign tps idle valve and so on, and well ive always used haltech in all my cars been using them for 6 years now this is my .... 5th haltech love em, oh and the gs400 3.27 with a trd auto TT lsd will handle over 850rwhp and 9's on the 1/4 mile but you are goin to have to source tt auto axles the na axles from what i know arent them same ....

Regan

 

[twinturbosupra94]

if your goin straight for an stand alone buy a flying lead kit soo much easier like my haltech ps2k came with relay's fuses everything and every wire came labled for example ign tps idle valve and so on, and well ive always used haltech in all my cars been using them for 6 years now this is my .... 5th haltech love em, oh and the gs400 3.27 with a trd auto TT lsd will handle over 850rwhp and 9's on the 1/4 mile but you are goin to have to source tt auto axles the na axles from what i know arent them same ....

Regan

OMG NO! You can't do that! ITS CUTTING CORNERS! :lol:

 

[ReganECR33]

if thats cutting corners i wont post my lhd converted jdm supra r33 skyline and s15 spec r, i should get nissan to make me 1 off lhd chassis's for me

 

[Ryeno]

if thats cutting corners i wont post my lhd converted jdm supra r33 skyline and s15 spec r, i should get nissan to make me 1 off lhd chassis's for me

well the sc (98-00 sc400) comes with that same differential so it's not as bad as a TT supra which comes with something better from the factory.

 

[jwhalen355]

Great info, Not to be a pain in the ass but do you think you can send me a link on the Haltech and flying lead kit. Its been a toss up between the Haltech and the AEM. I think the Haltech is an awesome unit but why do I hear about the AEM being preferable to any other standalone in the Supra platform??? The V2 is supposed to be way easier than the V1 AEM, just not sure which way to go...