Replace the o2 sensor since you know its bad, do a boost leak test, videos on youtube on how to.

Ok thanks, I'll try that today or tomorrow

I did that and it still does it, when I step on it all the way it stutters at 4000 rpms then a black smoke comes out my exhaust, I just put in a 255 walbro fuel pump and have 550cc injectors on it but I don't think I have a AFPR on it, would that be my problem?

What are you using to compensate for the 550's? If nothing then that may be your problem. Put your stock 450's back on until you have something to adjust fuel trims.. I would also recommend getting a wideband when modding the fuel system and of course an SAFC, ECMlink or a Flash tune will do. If none if this help check the plugs and gap.

I don't think I have anything to compensate my 550's that's how I bought the car if I buy the wideband controller can I keep the 550's or put the stock ones back? After that what would I need to do?

And would I need the gauge wideband or the controller?

I recommend an lc1 wideband with the gauge, but I would definitely put the stock injectors in until you have something to tune and log with. You are dumping excessive amounts of fuel in right now.

Damn really, well umma get a innovate motorsports wideband kit and a SAFC for it, do I still need to put back the stock injectors?

I agree with the other members. Change the bad 02, take out the 550's and put the 450's back in until you can control the bigger injectors. Start there and come back with your results. I was in the same boat a few months ago, bought a gst that would barely run because the kid I got it off of put a wally 255 in with 650's with no afpr of afc.

Ok thanks guys ill do that today

Well I put the stock injectors but it still stutters a little bit, umma put a wideband with a SAFC to see if that stops the stuttering

Is the 02 sensor the only code your getting?

why have you still not fixed the 02 sensor?

I did fix the o2 sensor, yea that's the only code I get nothing else

You probably fouled your plugs out with those injectors. Get a new set of Ngk bre6's and gap them to .028 and see if that fixes the stutter problem. Once you get the wideband and the safc, you could put those injectors back in. If you aren't raising the boost past stock with the stock turbo, I wouldn't worry about it though. And as for the fpr with the wally 255, I wouldn't worry about it. You should be fine with the stock fpr as long as it is in good condition.

I would save my money and buy dsmlink instead of getting a safc, but I guess that depends on if you ever want to go bigger. It will be fine for your 550's, but anything over 650, you will need dsmlink or another way to tune.

Well I have a 16g evo 3 turbo on it and I just put some NGKS and the stock injectors back and I'm pushing 18 PSI

I wouldn't go over 12 psI until you have a wideband and a way to datalog. Its better to be safe than sorry.

Then u think I should get a boost controller?

96_EcLiPsE_GsT said:

Then u think I should get a boost controller?

Click to expand...

Here is what I think. I think you should replace the stock 450s, plug the wastegate line into your j pipe (or where ever your boost source is), until you order dsmlink or get an eco 8 or a black box ecu with ecuflash, order an innovate wideband and gauge, and get all your maintenance in check. Most people here will probably recommend a afpr with that 255, as do i. I might also pick up new plug wires depending on how old your current ones are. After you do this, then you might want to think about a boost controller.

Ok thanks