Does anyone know if either MAF or Speed Density respond better to Aftermarket chips? What exactly does the chip control? Thanks

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1991 5.7L Z28
14.456 @ 92.78 MPH

 

The settings in the chip control a lot. Basically, the settings say "with this much throttle, this much rpm, this much vaccuum signal, this much MAF flow, at this mph, we're going to give it this much fuel, and this much timing advance, and this much EGR."

Idle, EGR, fuel, timing advance, fans are all outputs of the computer, TPS, MAF, O2, and a heck of a lot else are inputs.

Mass Air Flow is forgiving when you make mods. If you change a few things, it doesn't have "issues" too frequently; speed density is going to need a PROM with major changes (cam) so it depends on what you mean by "respond better to"


That's "the basics" at 1:49am

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jmd
1986 SS with...
86LB9 TPI atop the original L69, hydraulic clutch T5, Energizer 272 cam, chargedair.com fan, Global West CNR-88-C negative roll kit, 89 Iroc front springs, CC635 Moog rear springs and a whole bunch of other fun stuff

 

What I find interesting is GM started with MAF 85-89 in F-bodies, went to MAP from 90-92. I know GM went back to MAF in the 1994 LT1 Cars, And they have kept the MAF in the LS1/LS6 etc cars of late. So considering this, MAF can't be all that bad.

GM apparently thinks that it is an easier system or somthing to work with, cause I would think that the MAP system would be less expensive to produce.

Honestly, if you want to mod your car, look into burning your own chiips, and look into the PROM board, there are lots of guys there willing to help, and It is a heck of a lot of fun to tell your friends that you make your own chips for your car.

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87 Formula Yellow/Black
Engine & Transmission
.040 over 5.0 converted to TPI, 9.5:1 Compression, SLP Cam Dur 206/212, Lift 480/487, Cent Line 112, SLP headers, SLP cat-back exhaust, K&N Airfilter, Modified Stock cold air intake, Ported & polished Stock TPI intake, Holley Adjustable Fuel Press regulator, AC Rapidfire Spark Plugs.
Gil Younger (no yo-yo) Shift Kit, Aluminum Driveshaft, 3.73 Posi gear
Suspension & Brakes:
Baer 12" brakes 4 wheels, KYB AGX Adjustable Shocks & struts, Hotchkis strut tower brace, South side machine frame connectors, Custom reinforced control arms and pan hard bar.
Interior:
Custom Leather interior, CUSTOM Yellow Gauge Faces, Kenwood Receiver, Pioneer Speakers, Kicker Substations, Kenwood 10 Disk Changer, Pioneer Amp.

87 Formula TPI (5 Speed) Yellow/Gray STOCK

1967 Buick Riviera 430hp Turns high 14's (Not bad for 4300 lbs)

83 Camaro (Parts)
83 T/A (parts)

http://www.3rdgenformula.com

[This message has been edited by okfoz (edited July 03, 2001).]

 

At some point I read that the MAF was more cost effective to produce which was the reason GM changed back. Also it is a more "forgiving" system which also gives a "sense" of more reliability for GM.

 

First, the NEW MAF system is light years ahead of anything GM did in the past. Also it uses BOTH sensors instead of just one.

The first MAF system was GM's first try, but it had a "flow limitation" that exceeded GM's newer engines that it had in the works. SD was a "stop gap" IMO to get them over the "hump" when they brought out the LT1 (which initially used SD also).

Once the new system was developed (with both sensor readings), they went that route. But you should FORGET about the new system for our cars, it is not compatible.

For our cars, there is MAF and SD...and NEITHER bears any resemblence to the new system. They truly are apples and carrots.

 

this is 100% true but dont forget. it uses MAF as its main means of measuring air. it uses MAP as a back up incase something goes wrong with you MAF. kinda like a back up mode without having to go into the fuel dumping limp home mode. personally, i think the MAF system on our cars is better than MAP. theres is very little to no benefit to switching over to MAP. MAP is just guessing how much air is entering the system, MAF is reading the amount of air entering the system. i know ill prolly get flamed for this but oh well, *flame suit on*