mashing and mixing harnesses question

[Oscar]

Okay. Right now my TS is electrically a 3 plug N/A car. 3 pin TPS, 4 pin MAF, wasted spark, etc. For my project I want to use the bulkhead harness in the engine bay and the bulkhead harness in the cabin and the engine harness from a 4 plug WRX wiring but retain the dash, rear harness and front engine bay harness from the TS. I\'ll add pictures of the harnesses I wish to replace.

This one...

and this one

The question is, how compatible are they going to be with the dash, front engine bay and rear harnesses from the Legacy?

PS, I know I\'m an idiot and/or a fool for still undertaking this and I know it will be probably less hassle to get a WRX/BC5/single conversion/3 plug turbo so on and so forth. But I have an ECU with a chip that has "Group N" written on it and I\'ll be damned if I don\'t get to try it out.

TL;DR converting a 3 plug N/A Legacy into a 4 plug single turbo by replacing cabin/engine bay bulkhead harness and engine harness.

[Koom]

With an educated guess, I\'d say you\'re opening a big scary can of worms that just really won\'t be worth it.

Subaru have a habit of using the same plugs, but swapping absolutely everything around, so at the least the plugs may be compatible but the wires will all need to come out and be swapped around.

Your best bet would be to use the four ECU plugs and mix and match them into the internal loom in place of the 3-plugs.

Then do the same to adapt a single turbo engine loom to the main harness, adding in all the extra wires that would be required.

But then when it\'s all done six months of swearing later, you still need to get the whole conversion certified and fit hoops to the driveshaft because the LVVTA think that it will now pole vault itself off the road....

GTB\'s are cheap to find and they go better than an early model with a Group N chip anyway. Unless you buy a BC5 and or early WRX RA and put your ECU in.

And just to re-iterate, this would be a massive headache. Bigger pain in the a** than having one of the Kim Jong family running your country.

Even modifying a 4-plug TT Legacy to run a 4-plug single turbo ECU is a big enough pain in the a** to not be worth attempting.

[titian]

Mr Koom...LOL :).. Now at least you can say "I told you so" ;D Must say i have to agree BIG BIG can O worms. Whats with LVVTA wanting hoops on drive shaft? Just interested ??? Thanks.

[Oscar]

Right now I don\'t think certification is a priority...

[Koom]

 Oscar said:

Right now I don\'t think certification is a priority...

It would also be the least of your worries

Titian, the hoops are a requirement that a few people have run into with power increases recently. But with any non turbo to turbo conversion they are compulsory. I think its i huge crock of sh## to be blatantly honest

[Oscar]

I think it\'s the same thing.

TBH, I could sneak past a WOF without a cert with my TS...possibly.

[titian]

 Koom']

[quote name='Oscar said:

Right now I don\'t think certification is a priority...

/quote]

It would also be the least of your worries

Titian, the hoops are a requirement that a few people have run into with power increases recently. But with any non turbo to turbo conversion they are compulsory. I think its i huge crock of sh## to be blatantly honest

WOW Thanks for the info. Have to agree crock O Sh%$ ??? :

[Oscar]

Alright then. The V1/2 HX20 Impreza manual...how many plugs did the ECU have?

Google sucks.

[Koom]

 Oscar said:

Alright then. The V1/2 HX20 Impreza manual...how many plugs did the ECU have?

Google sucks.

Stop making your life difficult and buy a WRX. They are cheap for the early ones!