recommend to re-tune NISMO cars after installing a cold intake?

ZKindaGuy · 03-29-2010, 05:59 PM

Quote:

Originally Posted by Modshack

Short answer: NO. The ECU will adapt to the minimal differences this will have on your car..

I don't know what the diameters of the tubing at the MAF portion are for various brands of CAI but the "diameter" concept I described is the determining factor and rule as to when to retune when putting on a CAI.

Modshack · 03-29-2010, 06:33 PM

Quote:

Originally Posted by ZKindaGuy

I don't know what the diameters of the tubing at the MAF portion are for various brands of CAI but the "diameter" concept I described is the determining factor and rule as to when to retune when putting on a CAI.

I've discussed this extensively...Off the shelf CAI's are not radical enough to require a "retune"...

ZKindaGuy · 03-29-2010, 09:09 PM

Quote:

Originally Posted by Modshack

I've discussed this extensively...Off the shelf CAI's are not radical enough to require a "retune"...

I can buy that. Caution though....it takes as little as a 5mm difference in diameter of the intake housing where the MAF sensor sits to make a significant A/F ratio impact. I assume then that most 370Z off-the-shelf CAI's are just about all the same diameter as the stock housing diameter at the MAF then?

Modshack · 03-30-2010, 08:12 AM

Quote:

Originally Posted by ZKindaGuy

I can buy that. Caution though....it takes as little as a 5mm difference in diameter of the intake housing where the MAF sensor sits to make a significant A/F ratio impact. I assume then that most 370Z off-the-shelf CAI's are just about all the same diameter as the stock housing diameter at the MAF then?

Stock MAF tube tapers from 2.34" to 2.36" and the car will run with a rich correction to long term fuel trims. (-9%). Bumping the MAF tube up to ONLY 2.39 seems to pretty much eliminate the rich correction and put the Fuel trims right at 0% correction. Only three one thousands of an inch.

Read about why here: Modshack | Stage 2 MOFO (BAMM)

My new tubes:

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