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550cc on stock maf question

Posted: Fri Dec 19, 2008 4:56 am
by know1
I know there are a bunch of threads out there about this topic. I have spent sometime reading up on it and I could swear I once before found specific information on this topic but can't find it again. I know you can run 440s on the stock ecu and it will just run a little rich in OL. My question is:

I will be getting tuned soon, but the place I will be getting tuned does not install rails/injectors. Because of this, I will have to install the injectors and rails before I go to the tuning shop and drive there with the bigger injectors. I will be installing 94 NA rails and 550cc yellow tops. Will my car run at all? I just need to limp it in CL to the tuner. Is this possible?

Posted: Fri Dec 19, 2008 6:18 am
by PhyrraM
It should get there fine.

Running rich might damage the cats, but for a short distance I think you'll be fine.

Posted: Fri Dec 19, 2008 6:31 am
by know1
...cats?

;)

3" catless turbo back

Posted: Fri Dec 19, 2008 6:39 am
by PhyrraM
Another thought, grab a JECS MAF for the trip. Why not tune for the JECS?

You'll have to figure out how to kill the check engine light, but I believe that's posted here somewhere.

It won't be perfect, but it will be alot closer than the stock Hitachi unit. And will have alot more headroom after tuning.

Posted: Fri Dec 19, 2008 7:26 am
by know1
JECS MAF is sitting on my desk right now. >:)


td04, 06 tmic, 3" turbo back, JECS MAF, 550cc yellow tops....mmhmm

Posted: Fri Dec 19, 2008 6:55 pm
by Legacy777
What are you tuning? Stock ECU? Piggy back?

Posted: Fri Dec 19, 2008 10:47 pm
by douglas vincent
T into the blue wire and ground. No CEL then.

Posted: Fri Dec 19, 2008 11:45 pm
by cj91legss
T into the blue wire and ground? will that work if you're running stock ecu? will there be any complications like running to lean or rich?

Posted: Sat Dec 20, 2008 5:33 am
by douglas vincent
If you run the 550s, you should still be a tad rich, but alot closer than if running the stock maf.


Yes, the grounding trick works with the stock ecu.