Turbo ecu

[Cavalier9696]

K I feel like I just wasted alot of money on putting a turbo on my RS 420a. I was told by a few people that a turbo ecu for a 420a arn't even made. Thats the only thing I need to get the turbo ready for my car.

So what computer do I use? I hope there is a way around this. Is there a piggyback made I can use?

Thanx

[david-b]

It all depends on your setup. If you're running a FMU and not running more than 8lbs of boost, you technically don't need anything.

You can use a SAFC but will only help lean out the car, not richen.

Other others include a standalone AEM EMS or the more popular for the 420a, MegaSquirt.

What are your goals and what is your setup?

[Cavalier9696]

Thanx for the reply dav

Basicly I just wanna run on 5 to 8psi right now. I just bought a FMU and a FPR. So as long as I run low psi a can run on stock ecu?

P.S IM praying the FPR is the right one for my car. I bought one for a gsx on ebay, but in the discription the guy said it will also work with 95 rs.

[david-b]

You don't need a FPR. I suppose it would work to drop down the static fuel pressure, but really not needed. The FMU will take care of everything you need. My old setup just had the FMU. Granted the FP sat at ~47psi at idle which is high, but for a basic setup that never saw over 8psi it was fine.

Which FMU did you buy? What size disc?

[Cavalier9696]

12:1. Was going to get the 10:1 but researched online and seen the most demanded was the 12:1. So your saying IM fine without ecu? Sorry if I keep asking same question, just want to be sure.

Well dang on the FPR. So it won't hurt to go ahead and put it on also?
Thanx

[david-b]

12:1 is the better choice. Technically you could run a 10:1, but that seems a little too lean to me.

You can still use the FRP. I would set static presure to 30psi at idle.

Then with the FMU:

baseFP + (boostPSI x 12) = boostFPpsi
((8*12)+30)= 126psi
This means at full boost (8psi), your fuel pressure is at 126psi.

I ran my setup with just a 12:1 FMU. Base FP was ~47psi which comes out to 143psi FP under full boost. That starts getting alittle high there.

You don't need anything such as a piggy-back or standalone for that.


I do want to make sure you replaced your fuel pump as well.

[Cavalier9696]

Sweet. Just got to wait for everything to come in. Was going to ask about a fuel pump. Any suggestions on what to get? Was thinking a Walbro 255.


And of ya. I also got 400cc injectors, should that be ok?

[david-b]

Stock injectors work fine. You can still use the injectors, but you're more likely to run super rich and probably start losing power. Stock injectors are good up to about 11-13psi of boost.

Get the 255, you will need it. Don't run the car without it once it's turboed. I made that mistake. Pretty sure the motors life span got cut down because of it.

[Cavalier9696]

K thanx dav. You took ALOT of weight off my shoulders. I got the injectors free anyway. Friend upgraded and just gave them to me. But thanx for all the help.

I came out pretty good just buying on ebay.

Walbro 255 fuel pump/ $49.99
Oil Return line/ $45.95
Downpipe/ $49.99
12:1 FMU/ $59.39
Turbo Manifold/ $115.00
FPR/ $77.98
Total/$398.30 all on ebay..hehe
The intercooler and piping, turbo, BOV, I bought from friend for $500.00, so basicly spent around $900.00 not to bad I guess. LOL think I still need the fuel lines though.

[david-b]

No problem. That's cheap as hell for the Walbro. Do you have a boost gauge? If not, get one. Also, what wastegate do you have?

Now I guess the next question I have to ask is what turbo are you going to be using?

[Cavalier9696]

It's a T25 with the gate already on it. Ya the boost gauge came from buddy when I got the intercooler along with a air/fuel ratio.

[david-b]

Originally Posted by Cavalier9696

It's a T25 with the gate already on it. Ya the boost gauge came from buddy when I got the intercooler along with a air/fuel ratio.

T25s have a Mitshubishi flanged housing You'll need either an adapter or a new exhaust housing on the turbo for it to work with the T3 flange on the exhaust mani.

Also, if you're still going to use the internal wg, you'll need to block off the external on the manifold. Most interal gates however, are set at ~12psi or so, which is going to be too much for you. With an external, the smallest spring you can get is generally a 7.25lb spring.

A/F gauge is useless.

[LandoAWD]

5 bucks says that is not a real Walbro. I'm concerned with the FPR price as well.

[Cavalier9696]

This is the pump.
http://cgi.ebay.com/ebaymotors/Walbr...Q5fAccessories

The reason I got it so cheap is cause the one I bought from him doesn't have the Pump Harness, or holder cup which is ok. My buddy has one of each cause he bought one for his other gsx but never put it on.

His pump come up missing but whoever took it left the Harness and cup.
We already planed out closing the external wastegate hole and getting a flange which I hear is pretty cheap(I Hope). But IM going to take a few pics of the turbo and post it on this thread cause there are to open bolt holes that I have no idea goes there, want to see if anyone on here knows.
Thanx guys. Ill be back with pics I hope.

K here is the link to the pics. I just added them to my myspace under "Turbo" folder. Forgot my photobucket pass.

myspace.com/nasviarou6us

Wow please delete those others. I did not mean to do that! The page kept freezing so I went back and hit send again. So SORRY for that guys! I tried to delete them but site running really slow.

[david-b]

Originally Posted by LandoAWD

5 bucks says that is not a real Walbro. I'm concerned with the FPR price as well.

The FPR was posted up in another thread I believe. It was a ebay brand one. Again, it's not needed, but would lower static pressure.

I would personally get an external wastegate instead. Like I said, the internal springs on the turbos are higher boost than I would recommend using.

Looking around... looks like it's 10psi, but I may be wrong on this one. Still a little higher than what I would run on stock.