This is the Build Thread for 1998 Eclipse Spyder 4g64T. Reply below.

August578 said:

This is the Build Thread for 1998 Eclipse Spyder 4g64T. Reply below.

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Hey August578, your build is pretty much the same thing I'm trying to do. Same model and year Spyder and same 97 GST ECU. Your tip on the Chevy swivelling thermostat housing was perfect. I've compared my GSX harness with the 4g64 harness. As best as I can tell, all I need is the knock sensor and the wastergate actuator solenoid. Did you do any other wiring mods to get the ECU to work? Can you tell me what fuel injectors you're running? Thanks

Besides wiring in the knock sensor you do have to by pass a fuel module for the spyder. It’s really simple and here is the link for the write up. But other than that it’s basically plug and play.


You don’t need the wastegate solenoid sensor to make it work. It just leaves an annoying CEL. I’m not sure on how to implement it so I kind of just live with it. You might be able to turn it off if you have ECM link but I havent gotten my hands on one to try. But from my experience besides the cel the car works fine.

For injectors, since I live in California and the emergency of a state ref or whatever reason I need to revert, also for a simple drop in an no wiring. I used 450cc High impedance. You can use the stock 450cc from the turbo but you have to have the resistor and wire it in which is a lil annoying.The 63 uses low impedance injectors.64 uses high imp. There are other performance websites that sell high impedance I think for a little cheaper. But these are the ones I bought.


Also a great but old guide was this website. I’m not sure if you found this prior but it def set me in the right direction. Also 95% of the write ups derive from this website.

http://web.archive.org/web/20050303225759/http://www.4g64.150m.com/performance.html

Def recommend digging around on this site if you have any doubts.

August578 said:

Besides wiring in the knock sensor you do have to by pass a fuel module for the spyder. It’s really simple and here is the link for the write up. But other than that it’s basically plug and play.

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

You don’t need the wastegate solenoid sensor to make it work. It just leaves an annoying CEL. I’m not sure on how to implement it so I kind of just live with it. You might be able to turn it off if you have ECM link but I havent gotten my hands on one to try. But from my experience besides the cel the car works fine.

For injectors, since I live in California and the emergency of a state ref or whatever reason I need to revert, also for a simple drop in an no wiring. I used 450cc High impedance. You can use the stock 450cc from the turbo but you have to have the resistor and wire it in which is a lil annoying.The 63 uses low impedance injectors.64 uses high imp. There are other performance websites that sell high impedance I think for a little cheaper. But these are the ones I bought.

Denso 450cc, 42lbs/hr, Import Fit

<style>#html-body [data-pb-style=T478C70]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}</style><div data-content-type="row" data-appearance="contained"...

www.fiveomotorsport.com

Also a great but old guide was this website. I’m not sure if you found this prior but it def set me in the right direction. Also 95% of the write ups derive from this website.

http://web.archive.org/web/20050303225759/http://www.4g64.150m.com/performance.html

Def recommend digging around on this site if you have any doubts.

Click to expand...

Thanks! I've wired in the knock sensor and done the fuel relay bypass. Going to do the injectors and give it a try. Did you put in a boost gauge?

Yeah Im running one. I recommend boost gauge and a innovate wideband the minimum. Just another set of eyes to monitor really.

For my boost gauge I ran it through the steering column boot and tapped into the fpr line.

Both have saved me before from dumb mistakes.

Awesome job keeping the DSM spirit alive. Thinking of turboing my 99 Spyder in the same way, since there is minimal wiring and I have spare turbo parts...

August578 said:

Besides wiring in the knock sensor you do have to by pass a fuel module for the spyder. It’s really simple and here is the link for the write up. But other than that it’s basically plug and play.

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

You don’t need the wastegate solenoid sensor to make it work. It just leaves an annoying CEL. I’m not sure on how to implement it so I kind of just live with it. You might be able to turn it off if you have ECM link but I havent gotten my hands on one to try. But from my experience besides the cel the car works fine.

For injectors, since I live in California and the emergency of a state ref or whatever reason I need to revert, also for a simple drop in an no wiring. I used 450cc High impedance. You can use the stock 450cc from the turbo but you have to have the resistor and wire it in which is a lil annoying.The 63 uses low impedance injectors.64 uses high imp. There are other performance websites that sell high impedance I think for a little cheaper. But these are the ones I bought.

Denso 450cc, 42lbs/hr, Import Fit

<style>#html-body [data-pb-style=T478C70]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}</style><div data-content-type="row" data-appearance="contained"...

www.fiveomotorsport.com

Also a great but old guide was this website. I’m not sure if you found this prior but it def set me in the right direction. Also 95% of the write ups derive from this website.

http://web.archive.org/web/20050303225759/http://www.4g64.150m.com/performance.html

Def recommend digging around on this site if you have any doubts.

Click to expand...

Just in case you wanted to get rid of that CEL, this is what I did. It seems to work. Wire in a wastegate solenoid and run the red-yellow wire on pin 1 to pin 11 on the ECU. Then tap the red wire on the MAF for the red wire on pin 2 of the wastegate solenoid. I confirmed the wiring using the circuit diagram and on my spare 4g63t harness.

This is great stuff honestly, glad you were able to find this out. Im prob going to give this a if I find a solenoid. Do you know where the stock location of the solenoid is?

Front right corner. Its on the bracket that has the coolant reservoir bottle.

What did you do for the turbo's cooling lines?

Ah I see thanks. For turbo coolant lines I'm not running any. Just oil cooled. But if you do want coolant lines another member told me he runs a T off the heater lines for both on the turbo.

Or if you really want to it's a 50/50 but the 63 water pipe may fit or not it has the coolant lines Someone told me it may fit but I'm not sure since I never tried it. From what I remember the 63 head has a different thermostat location from the 64 so it's a gamble.

August578 said:

Or if you really want to it's a 50/50 but the 63 water pipe may fit or not it has the coolant lines Someone told me it may fit but I'm not sure since I never tried it. From what I remember the 63 head has a different thermostat location from the 64 so it's a gamble.

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I took a look at 63 water pipe. Don't think it will fit. I'll try the T off the heater lines idea

n7k1 said:

I took a look at 63 water pipe. Don't think it will fit. I'll try the T off the heater lines idea

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When I turboed my spyder GS way back when, I t'd into the coolant lines for the throttle body. Later on I ended up ditching the water cooling for the turbo all together. Never had any issues

Same as well so far so good

Hey August578, one last question, where did you connect the bypass valve vacuum line to? We don't have a dedicated port on the 4g64 intake. Did you tee off the FPR or the solenoid valve? I have a spare 'P' port from the 4g63t throttle body I swapped in - but I read that it might not work.

There is a port on the stock intake I used. I forgot exactly what line it was and what it does but its this one right here. It something for egr I think. I could be wrong. It was a tight fit I used a lot of WD40 and grease to get it on but it works well. I say that because I think only certain years of the 4g64 on the intake mani have this weird flared nipple. Ive seen other ones where its not flared.

August578 said:

There is a port on the stock intake I used. I forgot exactly what line it was and what it does but its this one right here. It something for egr I think. I could be wrong. It was a tight fit I used a lot of WD40 and grease to get it on but it works well. I say that because I think only certain years of the 4g64 on the intake mani have this weird flared nipple. Ive seen other ones where its not flared.

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Thank you! I'm almost done

No problem, but you gotta post pics of the finished build. Sounds like its going really well!

August578 said:

No problem, but you gotta post pics of the finished build. Sounds like its going really well!

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Here's my build so far: https://www.dsmtuners.com/dsm-profiles/1998-eclipse-awd-4g64t-spyder-gs.16392/