I need an education...I don't know anything about MAF's. I have the opportunity to get a used Delphi 85 mm MAF. What is a Delphi? Is it just another aftermarket brand or does this come from GM? What are its good & bad points on a basically stock 2001 LS1? Thanks guys, Gar

 

If you really want to do some reading, look around in the PCM section. Short story: On a stock motor, you're not going to see any benefit from a big MAF. The MAF table in your PCM isn't optimized for it, so it may do more to mess with the airflow calculations than any benefit you'd see from the added airflow. I'd stick with the stock one of you have it.

-Matt

 

Matt, thanks for the response. I am sending my computer out to have the usual modifications performed for my conversion. Can I take advantage of this & have it remapped for the larger MAF? I do have headers & 1.8 rockers on the engine, nothing else. Would this be the time? What will I gain? I really enjoy learning this LS1 stuff, as they seem to have so much potential! Thanks, Gar

 

As someone who did a 85mm swap with H&C I agree. I don't think the 85mm gained much if anything. However the MAF was added at the same time as the H&C. The tables do need to be changed for the bigger. LS1howto.com has the needed table changes

 

I'd stay with stock. It can handle it just fine.

 

The MAF sensor senses incoming air and calculates the mass of said air using a resistive wire and varying current to maintain a specific temperature. (If that doesn't make sense, it's ok.) The point is that it is calibrated for a specific air intake tract. When you change either the air tract or the MAF itself, the relationship between frequency and air is different. The way that most DIY tuners on this forum calculate new tables is to log frequency and dynamic air and modify the table so that they correlate. Here's one thread that discusses it.

Maybe this was more than you wanted to know. Short answer: you really can't get a very accurate table without logging. The stock table with the stock MAF should do you just fine. I went thru the logging to get my MAF table and it was pretty close to the stock F-body table. (Actually, I am using the Holden table right now because it was even closer and it's running great.) My intake tract is very different than a stock F-body. (I have a 2004 GTO elbow with the stock MAF and a K&N cone on the end.)

Hope that helps a little.

-Matt

 

We tuned a 2002 Silverado 5.3 on the dyno with not much more than headers, intake, and a cat back exhaust on it. We had a Z06 MAF laying around and decided to try it to see if there was any difference. We put the Z06 MAF table in the computer and ran it after tuning the truck, and it made no difference than the stock 5.3 sensor.
I tend to think that unless you are moving ALOT of air, like in a blower application and need the bigger hole, than it is not worth anything really.

 

This helps a lot in my decision to stay stock. Sense I am a beginner at understanding the LS1 systems, you have made it very easy to follow in your descriptions and analogies. Thanks, Gar