Spyder Turbo ECU swap in 98 Spyder GS

[trustedmaniac79]

I've searched & read every article/discussion I can find about turboing my 4g64. I've bought everything needed so far, but I haven't bought a turbo throttle body or intake manifold. My question is can I use my 4g64 throttle body & intake if I'm swapping to a 97 gst ECU? Yes I'm putting 2g 450cc injectors & fuel rail on as well.

 

[motomattx]

I dont see why not, are you using a 4g63 head? or the 4g64 head? as long as it bolts up and doesn't leave any air leaks it should be ok.

 

[trustedmaniac79]

I'm using the 4g64 sohc & I was gonna use the 4g64 throttle body & intake manifold for now, but some of the things I've read on doin the turbo ecu swap they always say to change throttle body. I don't see why the 4g64 throttle body wouldn't work, but I'd rather ask before starting the project so I don't have issues

 

[Purevil]

The isc is different on the 4g64 and uses a different plug. If you swap to a turbo wire harness it won't work unless you swap the isc plug.

 

[trustedmaniac79]

I'm not using the 4g63 harness just ECU, all I need to know is if I have to swap the throttle body & intake manifold if I'm going to use turbo ECU. Every article I've read says to swap throttle bodies & I'm trying to figure out if it's a MUST or just a suggestion

 

[Spyder786]

I recently installed a turbo ecu in my gs spyder and its actually feels and pulls stronger then it did before with the stock ecu, even without the turbo hooked up!

how are you planning to wire the turbo ecu? if you just plug it into the existing 4g64 wiring harness im pretty sure it wont work because the wiring going to the ecu's is different - have a look at the ecu pinouts and you will see the difference. As far as i have read, you can rewire the 4g64 isc to work but that only works if you'reusing a turbo harness. intake manifold must match the head you're using, 4g63 manifold for dohc head and 4g64 for sohc head - the intake ports are different sizes and i don't think the bolt patters line up either but I may be wrong. the turbo ecu works with both heads as long as your cam angle sensor is the same year as the ecu. if you go the route of using the existing 4g64 harness there is a write up on here that goes into detail. i read that post for years before i said nahh and swapped over the wiring harness instead - even that was not as simple as it sounds (for me at least) but way easier than leaning over an engine bay with a soldering iron trying not to burn anything. wait till you get to the fuel pump, if you dont own a volt meter you may want to buy one!

my good friend is a mechanic, he saw me sweating last summer working on my car and chuckled "all that work for 200 hp"

You must be logged in to view this image or video.

You must be logged in to view this image or video.

 

[trustedmaniac79]

I have read that article about using the 4g64 harness & that's actually how I'm gonna do it. As for the electrical differences I've got a actual Mitsubishi Eclipse workshop manual for 1997, 1998 & 1999 & I order the correct pins so I can change the wires in the connectors properly & give that exact pin what the ECU is needing. Along with adding knock sensor harness with grounded shielded cover, resistor box that I'm gonna make a injector harness and pinning each wire in the connectors properly. Correct me if I'm wrong but I was almost certain that you only had 2 wire n the CAS if u did the 4g63 DOHC head swap, if so it's only cause the CAS from the 4g64 would fire 180° as compared 2 the 63 CAS. In that case I'll swap the firing order on my coils. But we are getting so off topic, I didn't need my entire project gone over of what/how/why of everything, I'm just curious if 4 some unseen reason I can't use the 1998 Spyder gs 4g64 throttle body with a 1997 gst ECU. Thanks for all the replies & info though guys

 

[Spyder786]

pretty sure the 4g64 iac will need to be rewired to work with the turbo ecu. i found this diagram searching google. looking forward to seeing how it all turns out/comes together

You must be logged in to view this image or video.

 

[trustedmaniac79]

Here is the link 2 the info that I'm using 2 do mine, & i thought that the IAC only needed rewired if u used a turbo throttle body with the 4g64 harness

 

[Spyder786]

quickly looking at the service manual for the 97, the wiring for the iac looks different. it would be interesting to know if the tps signal is different as well. it may be wise to look over the rest of the diagrams and trace/compare where these connections end up

You must be logged in to view this image or video.

You must be logged in to view this image or video.

 

[trustedmaniac79]

https://www.dsmtuners.com/threads/turbo-ecu-in-a-spyder-gs.424084/

 

[trustedmaniac79]

That's the link 2 the write up "HOW TO" I'm using

 

[trustedmaniac79]

Spyder786 the diag of the connectors u posted 1st shows 1 & 3 not having anything. But the electrical diag clearly shows that there's a Black wire & a Green-Yellow wire on the 4g64 IAC.

 

[Tyeler18]

No i doubt the turbo ecu can run the 4g64 idle motor. The 4g63 uses a stepper motor, the 4g64 uses 2 position sensors and a regular electric idle bump motor. I'd doubt the ecu will operate it properly but I've never tried. I use the same IAC on the 4g64 in my mighty max and it's just a crude motor.

 

[Spyder786]

@trustedmaniac79 ahh yes thats the link, close to the beginning of that 'how to' #8 it says the 4g64 TB wont work (as @Tyeler18 mentioned) so they use the turbo TB. The electrical pics i sent were from the 97 manual so it may be different for that year (96/97).

that being said, its a minor part in the grand scheme of this turbo conversion. can always swap out the TB at the end when you're ready to fire it up if you have trouble with idling or starting.

man I really wish they still had that 4g64 yahoo group up. there's almost no new threads or new info about turbo'ing a 4g64 out there

 

[trustedmaniac79]

Thanks Tyler18 that's exactly y I asked, I kept seeing n the different "HOW TO's" u needed a turbo throttle body but never said exactly y or if it was a mandatory part if using turbo ECU. Now I understand y & that it's not something I can wait & do later on. Thanks everyone 4 the assistance