Car sputters after 2g mas install

[GettinPaper]

After installing a 2g mas my car seems to sputter in low rpms?
from 1500 till i start to boost it seems like it bucks/sputters...
but while i'm boosting it's fine..
Anyone seem to know the cause?

 

[gsx7707]

try cleaning it with mas cleaner i have had that problem with a oily mas.

 

[blowinsmoke95]

my car does this as well... but i have a 90 with a 1g maf

 

[carpethead10]

When was the last time the car had a tune up? Have you ever cleaned the throttle body? I coulnt believe how dirty mine was with only having 90k on it.

 

[donniekak]

How are you compensating for the maf?

 

[GettinPaper]

How are you compensating for the maf?

What do you mean by that?

 

[robbo185]

What do you mean by that?

do you have larger injectors for the increase in airflow??

any time of engine management....dsmlink/safc....etc

 

[GettinPaper]

do you have larger injectors for the increase in airflow??

any time of engine management....dsmlink/safc....etc

i'm still on the stock 450's.. but i have a rewired walbro 255 fuel pump..
could it be i need bigger injectors?

 

[robbo185]

can you give a list of all your mods

 

[92AWDHX40]

List your mods would be great you cant just put it on and expect it to run correctly.

 

[GettinPaper]

Rewired walbro 255 fuel pump, Manual boost controller set to 15lbs, FMIC, Full 3in turbo back exhaust, and the 2G Maf.. I cleaned the maf and it seems to be running a little better. Also still rockin' the 14B

 

[delta448]

do you have larger injectors for the increase in airflow??

You do not need larger injectors, you need an SAFC, logger and a wideband O2 to add fuel/airflow at low throttle and cruise.

The 2G MAS will read a lower Hz frequency at the same flow volume as the 1G MAS, this causes the ECU to dispatch less fuel from the injectors. You're running very lean at idle and cruise, this is why it bogs, sputters and misses. When you hit higher boost the ECU targets a very rich AFR, this is the only thing saving you from burning your engine to the ground right now.

 

[GettinPaper]

Damn, so i need a wideband, and a safc?
Should i leave the maf in or take it out?

 

[steve]

Damn, so i need a wideband, and a safc?
Should i leave the maf in or take it out?

Until you have an SAFC or a something else to correct for the differences in the MAFs you should take it out.

 

[GettinPaper]

so i picked up an safc for 80$
and i'm going to follow the vfaq setup..

So i got the safc hooked up, and i was wondering what settings i should set it to compensate for the 2g maf?