2g mas on 1g idles weird

[Russman1986]

Put a 2g mas on my 91 gsx. I know the mas is good came off my 96. Used the vfaq to make the harness. The car idles ruff and has bad TB response and backfires some any ideas?
I know I don't have a boost leak was tested.

 

[bryanwheat]

Are you tuning it with anything or using 550cc injectors?

 

[Bud92gsx]

Did you wire it like this? http://www.dsmtuners.com/forums/articles-intake-exhaust/440902-2g-maf-wiring-dummies.html

Are you using 550 injectors, a tuner, or stock injectors?

 

[Russman1986]

It is wired correctly. The 91 is all stock but hard pipe.

 

[donniekak]

It is wired correctly. The 91 is all stock but hard pipe.

Then it's not going to work properly. The 2g maf is going to make the car run about 20% leaner without a way to compensate.

 

[agentorange313]

Then it's not going to work properly. The 2g maf is going to make the car run about 20% leaner without a way to compensate.

^This, same applies to using the EVO mas.

You need a method of compensating, larger injectors or a tuning solution, AFC or ecmlink for examles.

 

[91stocker]

With no tune, you will need to run evo 550cc injectors. The evo injectors with no tune will run "about" 20% too rich. And like said above, the 2g mas will run "about" 20% too lean on the 1g.

So when combined they almost cancel out. Allowing you to run more injector and more boost on an otherwise stock setup. A pretty effective budget upgrade really. The evo injectors can be had for about $100 on average.

I would still recommend you get a logger on there though. Watch the logs to see how much boost you can get away with. There are numerous free loggers and Do-it-yourself write ups on making your own logging cable for about $7.

 

[Russman1986]

I have played the DSM game for a wile. I have built alot of cars, I had no idea about that. That car I was building with all of the best of the 1st and 2nd gen parts left over form other builds. Thank you for the info.

 

[untouchablecc]

I have played the DSM game for a wile. I have built alot of cars, I had no idea about that. That car I was building with all of the best of the 1st and 2nd gen parts left over form other builds. Thank you for the info.

Same here. I started messing with these cars in 04 with my friends and I just recently found out about the 2g mass on a 1g with 550 injectors. Justin actually told me about this when I went to get a turbo from him a few weeks ago. He said that is how dsmers back in the day got it done before the luxury of link and other tuning programs. I was also informed you could get away with 18-20 lbs of boost. I will be doing this to my 1g daily with some logging software to check for knockage. I just so happen to have a 2g maf laying around and the car already has 550inj

 

[92AWDHX40]

Grab some 550s or some evo 560s, get a logger to help, good to go.