tune after cams...dissapointed

[98gst62]

Installed Fp2's, Crower springs and retainers. Had it dyno tuned...and it couldnt be tuned for crap only gained about 10hp . it was due to the gm maft, that would throw off everything. I dont really want to take that out, and go back to the stock mas because i would have to get a new uicp, intake and mas. Is there another option, like maft pro or am i sol?

 

[DJYoshaBYD]

What are you using to tune? If you have something else besides MAFT, then just 0 out your MAFT so its just acting as a translator, not a tuning device...

 

[dsm-onster]

Are the numbers in your profile the numbers you've jsut gotten from this dyno session to you are refering? if so then:

Have you checked for boost leaks?
Have you checked your compression?
Have you checked your cam timing?
Have you checked your ignition timing?
Base fuel pressure?
What are your fuel trims?
Did the dyno shop apply a base tune to your bill? or was this done first by you?

My GM MAF Blowthru set up is great. A bit touchy in the tuning process. Nevertheless, I have no regrets.

What do you mean by

it was due to the gm maft, that would throw off everything.

Did you put your stock maf in to verify this? or did your dyno guy tell you this?

 

[98gst62]

The numbers in my profile are before the head work. I have had all my tuning done by them with the stock maf, with the gm maf blowthrough, and with the blowthrough and cams. this is the only time they had a problem with tuning it. every thing checks out ok, no boost leaks, compression is fine, fuel trim is fine now but they were limited to a base tuning due to the gm maf leaning it out soo much every time they did a pull. they advised me to go back to the stock mas, which i am considering. this was done at a very reputable shop and i trust their opinions. I really like the blowthrough setup, but i also want my car at its full potential.

 

[98gst62]

If i took it out of blowthrough and put it before the turbo, would that help ease the tune and stop the inconsistency?

 

[dsm-onster]

Yes this usually helps...

 

[Hop]

The GM MAF in blow through doesn't match the stock MAS exactly, I know that for a fact on my car. Praises to DSMLink for allowing me to tweak the airflow table!

 

[98gst62]

So, am I better off going back to the stock mas, will the gm maf still be inconsistent in drawthrough?