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This Vitesse MAF thing..

Tam Lin

Tam Lin

New member
Having saved up for the next round of ugrades, my long-suffering 924S has had a Vitesse MAF & Piggyback programmable mapping facility installed for its S2 3.0 lump.

Boy does it make a difference. What I always thought were vibrations inherrent to a four pot with HUUUGE pistons have disappeared thanks to a mapped flat AFR. So it was inconsistent fuelling all along.

The power increase is nice (up about 14 BHP at the wheels to 183). The sound is great. What used to be a drone is a lovely hardeding of sound as the needle climbs from 4k to 6k rpm. Thanks to John Vitesse for the product, and thanks to Promax for adapting it to my, erm, unusual vehicle. It's expensive. But it's a drastic improvement in feel. Oddly, more so than fitting the 3.0 engine instead of the standard 2.5.
 
That's very interesting to know. I have always been of the opinion that a MAF upgrade on a N/A car would not make that much difference to the outright power, but it would improve the delivery and responsiveness. So it's very good to hear you've had a useful power increase and it has also cured a niggling problem after getting the AFR spot on with the piggyback
 
ORIGINAL: TTM

Are you suggesting the fueling of the original mapping is lean?
Click to expand...
The original AFR on mine was all over the place: really rich (down to 9.5) just after 2000 rpm, then leaning off to about 14 around 3500, then going richer and richer to about 5400. The injectors were fine, the fuel regulator/fuel pressure were fine, and chipping didn't seem to make that much of a difference. Because of the installation (in a 924) the intake is K&N and non-standard, which may have had something to do with it, but mostly I suspect it was the signal the AFM fed the Motronic...
 
Sounds like you had some problem with the injection system. Perhaps the AFM was worn around the 2k mark where the engine spends most of its time. The MAF replaces this component so would eliminate the issue.
 
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