SD tune, but MAF is still installed?

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Dec 28, 2013 | 11:35 AM

TAPyvehc93

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From: Mooresville

SD tune, but MAF is still installed?

Hey all. When i bought my car, it supposable had a SD tune on it. The thing is, it still has the MAF still installed on the intake but its not connected to the plug. I am not sure if the previous owner had left the MAF installed when he had it SD tuned or not. I was wanting to remove the MAF(I believe its the stock one) and just install a coupler from the lid directly to my 90mm TB, but i am not sure if that would through off the SD tune because of there being less restriction? Any help would be great.

Dec 28, 2013 | 11:53 AM

soundengineer

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From: Chicago IL

for an SD tune..the MAF can physically be there, and even still plugged in...

all that matters is the Tune has the MAF fail frequency set to 0
or you can just unplug the MAF which will cause it to fail and it will go into SD

only way to know for certain if the car is in SD is to check the tune

Dec 28, 2013 | 11:54 AM

Ed Wright

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A piece of tubing in it's place would be fine. Not likely to run any faster. LOL

Dec 28, 2013 | 12:37 PM

TAPyvehc93

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Quote:

Originally Posted by Ed Wright

A piece of tubing in it's place would be fine. Not likely to run any faster. LOL

Should add about 20hp. lol jk. I was more worried about it causing it to run too rich or too lean. Since there should be more airflow without it.

Dec 28, 2013 | 12:50 PM

Ed Wright

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Quote:

Originally Posted by TAPyvehc93

Should add about 20hp. lol jk. I was more worried about it causing it to run too rich or too lean. Since there should be more airflow without it.

Which do you think it would be? Sounds like maybe you should leave it alone.

Dec 28, 2013 | 08:29 PM

maf_diver

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From: Straya

Any increase in airflow from freeing up the intake will show up as increased MAP, so the PCM will compensate. The MAF is about a 0.3 kPa restriction on a stocker (I've tested it), so expect to gain about 0.3% power