car sputters at higher rpms after maft install

[4BangerV8Killer]

yesterday i installed my blow thru setup and now when i hit boost anything over 10 psi my car kicks and looses all power....i tried to tune the maft the best i could and left my safc settings as they were from before the install.....what could be causing this?

i tuned the base and idle on the maft but left the mid and wot zeroed out. is this ok? and just tune the mid/high with the safc?

but what would cause the kicking?

 

[Quasimondo]

Sounds like you're triggering fuel cut from a combination of the maft and afc settings. Since your afc settings are untouched, set the translator back to its 450cc setting and continue to tune with the afc only.

 

[4BangerV8Killer]

so....zero out the base knob...what about the idle knob? and it doesnt feel anything like fuel cut .....just small sputtering

 

[Quasimondo]

It should be Aux 0, Base 2, Idle, Mid, and WOT all at 0

 

[4BangerV8Killer]

Yesterday i installed my 3'' maf and translator...i tune my car with safc but when i installed it i tuned the base and idle on the translator and left the mid and wot set to 0....i also left my safc settings untouched....now my car sputters at WOT and feels like i lost half of my power...i logged it and checked it and everything seemed ok..not running too rich or lean...injector duty cycles look fine. today i did a boost leak and found no leaks. idk what else it could be....should i just zero out the maft all together? and only use the safc? and my dsmlink should be coming in in like a week or so...when it does should i use that only and zero out the maft as well? if so how to i do that? im 99% sure i have version 1.3 but cant tell except for the sticker on the lid...idk if its been upgraded or not i dont know how to tell.

Thanks,
Ricky

 

[eclipsegsx1736]

With DSMlink, set the MAFT for 450cc injectors and do all your tuning within DSMlink. Set the injectors to the correct size in DSMlink etc and use the Airflow table to get the GM MAF to replicate the stock 2g MAS reading.

Sounds like your MAF is reading too high airflow under boost, causing a very rich condition, which is very common. My Airflow tables in DSMlink are +14% at idle, -7-10% at cruise, and -20% at WOT. That means my MAF is reading 20% too high of an airflow reading at WOT which is pretty common too. Once you get it dialed in with DSMlink, it should run better than with the stock 2g MAS if anything.

What kind of Karman readings were you getting with the 2g MAS, and what are they now? Can you hook up the 2g MAS again (you can leave the GM MAF in the piping) and compare the airflow readings back to back?

 

[4BangerV8Killer]

ill have to go do a couple logs then get back to you guys

 

[Michael Z.]

Theoretically, both the SAFC and the MAFT work in the same way. They both act as piggy-backs by tricking the ECU. By trying to tune the car with both systems, it gets a bit hairy when it doesn't need to be.

I got rid of my SAFC all together, and ran a keydiver chip. I had the chip set to 780cc, and zeroed out the MAFT. Once I got a desirable idle, I tuned very slightly with the MAFT for low, mid, and high settings. Set it, and forget it -- at least for me. This is a daily, so as long as I have a decent tune, I'm happy.