MAF vs MAP Options

[jason]

Just curious what everyone's opinions on these are (FI application)

for a street driven car (low throttle driving) that also see's its share pf peppy driving (wot pulls) which is "better" and why?

blow off would be recirculated, and leaks not being considered, why would one choose a map system besides tunning capabilities?

[lagos]

one tuner, this is complete speculation, thought that it could be the gt2871r, it was pulling a lot more air than the stock turbo, going past the threshold that the MAF was supposed to be operating within

This is why. the 2871 makes a good 40-50hp more at the same boost level then the ct26. On the ct26, i have personally seen different air flow values and a/f ratios at 7psi and 12psi. after that, it just keeps the same air flow reading.

Art, this is far from a silly topic. This is general tuning stuff that no matter the application has value.

Its a silly topic because its too general. You cant say a one is better then the other in a general sense, and that everyone, regardless of what car they are in, should ditch their setup for the clear winner.

Take a look at the evo and sti guys. Their cars come with mafs located preturbo. Now by all accounts this is great, the maf should account for changes in VE and everything should be fine no matter what minor bolt ons you do to the car. However this is not the case. Those guys (expecially subaru guys) run into all kinds of trouble just from installing an intake. Seems simple things like that throw off their highly sensitive hot wire systems giving them all kinds of drivebility problems. So why dont all those guys just convert to map? Because they have fully programmable ecu's and can simple change their tune to account for the difference in air flow reading. in that cause, it actually makes no sense to convert the car to a map system just to fix what is essentially a maf related problem.

point is... work with what you got. the real problem is not so much the sensor, but the ability to retune your stock fuel maps to account for your new mods. Only at very high hp levels will you see some sensors run out of resolution, and at that point, you will be on a stand alone ecu, and will be able to convert to the type of sensor that suits your needs (generally map).

This post has been edited by lagos: May 29, 2009 - 11:17 PM