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CougarXR/7
08-15-2016, 10:14 PM
Ok......I road Course my 94' SC five speed.............I am curious............has anyone move their MAF directly on the TB? I am building vented back plates for my 13" front brakes and thought of moving the MAF to see if there were any gains.

sam jones
08-16-2016, 03:42 AM
Good morning

I am not a tune expert but I would assume moving the stock MAF sensor closer to or directly in front of the throttle body would compromise factory ECU fuel mapping/metering adjustments. I'm sure a tuner from this forum could explain this better than I. Maybe this can help. Read the under MAF sensor failure patterns.



https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwikmLi_ssXOAhUF6iYKHbEWAZUQFggcMAA&url=http%3A%2F%2Fwww.counterman.com%2Funderstandin g-mass-air-flow-issues%2F&usg=AFQjCNF_-tnfxmIe22LLLeUfftkks0An4g&sig2=AjNagf-AHyHviTaat28NBA



Good Luck.

DrFishbone
08-16-2016, 12:57 PM
Good morning

I am not a tune expert but I would assume moving the stock MAF sensor closer to or directly in front of the throttle body would compromise factory ECU fuel mapping/metering adjustments. I'm sure a tuner from this forum could explain this better than I. Maybe this can help. Read the under MAF sensor failure patterns.



https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwikmLi_ssXOAhUF6iYKHbEWAZUQFggcMAA&url=http%3A%2F%2Fwww.counterman.com%2Funderstandin g-mass-air-flow-issues%2F&usg=AFQjCNF_-tnfxmIe22LLLeUfftkks0An4g&sig2=AjNagf-AHyHviTaat28NBA



Good Luck.

You are correct.

Bends and obstructions upstream (especially) and downstream of most flow meters will change the voltage vs flowrate output of the sensor. The factory MAF curve is set-up for the stock airbox arrangement, so really any physical changes to the air inlet can throw the curve off by some amount. If you can tune the car, you can re-align the voltage vs flow curve to make things work right.

BUT....

I think you will have problems even doing this with the throttle plate being so close to the MAF. The throttle plate would be a variable that I don't think could be easily compensated for, since the rate of throttle angle change couldn't be factored into the MAF curve. Maybe it wouldn't interfere as much as I'm picturing, but I could see quick throttle changes leading to spikes (or dips) in the MAF reading - which would lead to improper fuel calcs for a split second. If anything, this would hurt performance.

Are you pondering power gains by doing this? The only possible power gains you might see from JUST moving the MAF are from accidently running leaner. I can't think of any practical reason you would want to move the MAF closer to the TB.

1FSTBRD
08-16-2016, 01:54 PM
Agreed on the advice here. I'm not an expert, either, but as far as I know and can remember reading about, the MAF needs a certain amount of distance and shielding from air reversion waves and turbulence/ resonance that feeds back from the throttle body and the intake, in general. Car manufacturers do their best to minimize this turbulence. Ie: our factory SC maf has a closed metering tube, whereas a C&L maf has an open blow/ draw through tube, and there has been known problems with C&L mafs and other mafs, as a result of airflow not being steady enough. There's definitely the possibility of enough turbulence in a forward motion, though I'm not sure exactly how much there is in a backward motion.

coupe2016
08-18-2016, 02:57 AM
Basically you would have to get the engine tweaked to the new adjustment you have made to the engine, i made the same mistake before the car will run fine in low end to mid range revs but as soon as you get into mid-high range revs the power will just cut... dreadful really don't make the same mistake i did