[Shotimes] MAF connector question

[Jonathan Zane KC2ENA]

Interesting information.  Just what I'm looking for.  I am getting a MAF
Overflow message from my Speedbrain on the Stang, but I never really knew
why.  I'll have to process this more.  C&L swears my MAF is good to 500hp
though.  Hmmmmmm.  Can this voltage be measures directly off of the MAF like
most other sensors?

Jonathan Zane
 


> -----Original Message-----
> [mailto:shotimes-admin@autox.team.net] On Behalf Of Mark Nunnally
> 
> The size of the MAF doesn't have as much to do with the 
> ultimate power you are trying to reach as much as the 
> voltage/air flow curve.
> 
> The stock MAF curve for the SHO and 5.0L mustang is an 850 
> kg/hr curve.  You can have a 100 mm MAF, and if it's set up 
> for a 850 kg/hr curve and you try to make 500 hp, you'll peg 
> the meter.  Once the EEC hits the cap of voltage, good-bye 
> tuning in terms of fine adjustments, fuel trim, etc.
> 
> You say a 77mm MAF is over-kill?  Well with a stock SHO 850 
> kg/hr curve on that MAF (ProM 77mm), I hit 4.4 peak volt on 
> my factory 3.2L. (260 crank hp).  That's pretty close to the 
> max voltage, so to get to 300 hp or so you'd need to dump the 
> 4.7 volt - 850 kg/hr limit, and re-tune it to 1000+ kg/hr at 
> 4.7 volt or so, and change the EEC chart to match.
> 
> This is why Josh and some of the other blower guys have gone 
> to the 80/90mm Lightning MAF's (have like a 1700 kg/hr peak 
> IIRC) AND changed the map in the EEC to match (ie, going way 
> above the 850 kg/hr limit).  I think some of the aftermarket 
> MAF's dont' achieve 1 volt at idle, where the Ford units 
> typically do (easier to tune).  Josh is making 465 hp 
> measured at the wheels, and is getting about 4.5 peak volt 
> (close to the limit) on his 80mm lighnting MAF (I think it's 
> on a 1600 or 1800 kg/hr peak)
> 
> Although I don't follow the blower discussions real close, I 
> seem to recall the Ford 80mm runs about 1100 kg/hr, and pegs 
> out around 400 hp.
> 
> mark
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