I, like most other forced induction LT1's am tuned on a maxed out MAF. I recently found that LPE has designed a MAF that combats the maxing out that the stock MAF's get. Would it be in my best interest to buy one for my tune I am having done this summer? Or am I just as well off knowing my new tune will also max out my MAF, and having it tuned like before?

Here's the link to the LPE MAF > http://www.lingenfelter.com/store/lp..._lpe-4232.html

 

Link doesn't work.

 

Sorry. It seemed to work earlier. Try this one> http://www.lingenfelter.com/store/lp..._lpe-4232.html

Or if that doesn't work try this one> http://www.lingenfelter.com/store/ ,and click on "Fuel System" and scroll to the bottom of the page. The MAF is fourth from the bottom.

 

why not run on speed density?

 

Do a search. You will find it is WAY hard and not really benefitial for us non speed density guys to swap to it (also not as accurate as running the MAF).

 

May sound like a dumb question, but better a dumb question then no question at all. How do you guys know if your maxing your MAF out? I use TunerCat and scan with Freescan if you want to get specific on where to look.

Ken R.

 

You will have to look at one of your scans at WOT. Look at the MAF reading... the max the computer will take in is 512gps. A stock MAF curve is usually maxes out around 471gps (I forget the exact number). So if you see 471ish or so you are maxing out the MAF. This is usually around 500rwhp or so.
You can look in your tunercat under the MAF calibrate. It will have a frequencey vs AFGS table. Look at what the largest AFGS number is and that will be the number to look for in your log.

 

That MAF looks interesting. They give you the new MAF calibration tables also. I assume for the same amount of air this MAF would register less frequency than the stock. It doesn't say anything about changing the inj constant but, I bet you could just adjust it accordingly. If the MAF reads half the air then half your inj constant?
It is 4" dia also so you would have to fab that up in place of the 3.5" factory MAF.

 

*cough* FAST *cough*

 

That MAF looks like it's meant for a draw through application (MAF before the blower where the 3.5" MAF is a restriction to a 4" blower intake), not a blow through. If you look at the calibration table (http://www.lingenfelter.com/document...esv1.0_000.xls) it's still maxing out at 512 gps.

SD actually makes a bit more sense to me on a blown car since you don't have any restrictions in the intake track (MAF) and fewer couplers/clamps to fail.

 

Is yours for sale?

You will have buy/create new couplers for fitting since as mentioned above it is 4 inches in diameter instead of 3.5 This shouldn't be a big problem since you can find different sized silione couplers all over the place.

 

I was getting a MAF high frequency excess error. (OBD2). Error corrected (avoided) with LT1-edit version 2.2. Mass threshold moved to 60+k from 10.7K stock PCM setting. (383 - D1)

 

It doesn't matter what sensor you hook up to the computer, the max number you can put in the MAF calibration table is 511 gm/sec, which equates to about 550 hp.

I brainstormed some ideas before and here they are:

Idea #1: Run 2 MAF sensors in parrallel air flow. Hook one up to the ECM and leave the other as a dummy. For any given air flow, you only have half of it being sensed by the active MAF, so it would run lean. Half the injector constant, so the fuel doubles. Your MAF will now support twice the hp without hitting the limit. Would probably work, but the dual MAF sensors is kinda' rigged.

Idea #2: Build a circuit that halves the MAF frequency to the ECM. This once again will make it run very lean. Half the injector constant so the fuel will double. Problem is that no one knows what the max frequency output is on the MAF. If it stops at 11,216 hz, then this method won't improve the situation at all.

Mike

 

Good inputs Mike. Thanks

 

This idea is interesting, but you would only need one MAF sensor and just piping with a y-split before the sensor right? Seems easy enough...