you know, i keep my car at 16 psi and it runs great. Turn it up to 19 and it doesnt run as good. But 19 at 4/5 throttle and it runs good. Its like i back off the throttle a bit and it runs harder than full throttle. So thinking i have a knock issue, (i dont, logged many times with UTEC) and this is on MAP 0 (passthrough). So i put in about 13 gallons of 76 cool blue 100 octane and at 19 psi it runs the same as with 91. HHmmm. I cant turn up the boost cause i lost the instructions to the EVC and will just hit the limit set and dump boost. Its set at 20.5. I hate weird crap. Maybe my new RNR turbo kit will help things out... ... RRR

 

It could be knock it could be timing or fuel as well just set much more consertive at those levels. Just have to do some logging and see the differences.

 

Fuel Cut. Get Walbro

 

i am getting 720cc injectors and walbro pump. Good advice. I think i got one of the dud evos. But when ime done, it better go from dud to DANG!!!!.... Thanks guys. RRR

 

you know what, just thought of this, maybe i need to reset the ecu???!!! RRR

 

Injectors is probably a smart idea. If you are maxing them out you will actaully feel your car get slower at higher boost. I know that I did. Just felt sloppy and not crisp like it did at the lower boost levels. If this started once the weather got colder it very well could be your problem.

 

FWIW, you won't be maxing out your stock injectors on 19psi and the stock turbo.

If I were you, I would refrain from installing a turbo kit or anything until you get this issue identified and addressed. Installing a larger turbo kit and hoping that it fixes an existing issue is asking to find yourself in a much worse position.

 

What are you measuring boost with? Maybe your 16psi is really 19 psi and your 19 psi is really 22 psi.

 

I Have the same issues i only run 16 lbs. I need to install my walbro and see if it helps

 

if you are staying at 19psi... i have been told by turbotrix or dynoflash that injector is not necessary but just a fuel pump.. once boost goes to 23+ then you need it definetly.

 

Guys it is possible on the stock turbo and with a walbro installed, I could hit 100% duty cycle at 19psi at about 6500-6600 rpms on up. This is running the AEM for EMS at 11.1 afr on 93 pump gas, I am also running cams 264in and 272ex so this is part of the issue but not much more of it. In the summer time I would hit about 90% or maybe a little bit higher but as soon as the weather got colder my duty cycles jumped at least 6-8+% higher. I am running the stock head too.

Guys I have attached a race gas map that I was running on the stock injectors with a walbro and boost running from 20psi and falling. You can see that I am at 85% duty cycle running 12.1afr. At 11.1afr I would be over 90% and the air temps are at 69.80 degrees. This is at night and when I was running the stock MAF setup. Also notice my boost has fallen to around 17psi and I am still at 85% injector duty cycle. I can post a map at 19psi in cold weather later on if you want it but it is on my other laptop so just let me know. At 19psi in cold weather the injectors would be and were maxed out over 95% duty cycle. I know that every car is different this is just the experience that I have had with mine. Hope it helps ya out.

 

Possibly, but I've personally witnessed cars running 350whp (DJ) with stock injectors and the dyno A/F graphs do not exhibit any leaning. That being said, this more than likely a moot point where rraulston's car is concerned. As for taking a shot in the dark, the fuel pump and/or programming seem to be the most likely culprits.

 

Very true and I have as well but I am in that hp range also but like you said there are so many varibles that it is like taking a shot in the dark, it is crazy how a mass produced car can be so different or the same.

Also as you said get the injector problem nailed down first before installing a turbo otherwise you will just be asking for more trouble.

 

Ted,

I have the same mods as gtevo and i was also hitting 95% IDC with the stock injectors in at 20psi at 6000 rpms.

 

FWIW, I have similar mods, and I am running 650cc injectors. However, if you're running 95% IDC, while you are running close to static, you probably aren't noting an actual lean condition.

In the case of rraulston's car, he is running factory cams, and even with good tuning would be probably at least some 20whp or so down, which would seem to indicate the injectors shouldn't be causing a serious lean condition. It is impossible? No, but I'm suggesting the fuel pump (or tuning) is the more likely culprit in this case.