VEMS engine management

[S2central.net]

Actually just found it, and the biggest HFM5 only scales to 1000kg/hr in its standard housing. If you note that 900kg/hr is approx 300bhp then we're left a bit short...

Could be a nice project for someone with a BIG flowbench to try that sensor in larger housing and characterise them.

In rough numbers we need 300kg/hr for each 100bhp, so a 500bhp capable MAF needs to get into 1500kg/hr capability... which is about 50% more than the biggest off the shelf HFM5 package.

Paul

[GazzaG60]

with the vems the maf is removed. in all honesty i dont have a good reason to keep one. one of the biggest issues on the subaru's was finding an ecu where the maf can be removed. we always found mafs would start to be an issue at 350hp +

how about trying a mustang maf. they are available at 3" and more. they can and ofter are recalibrated before sale to suit apps. maybe having a word in somebodies ear will give you a maf thats big that is calibrated same as S2?

[A80Avant]

interesting...

[S2central.net]

Have indeed heard of a big Bosch one fitted to recent Mustangs - but I can't remember the details... I like MAFs for accuracy, but I totally take the point they can be a PITA on big power cars where 'accurate enough' is good enough.

[GazzaG60]

think the maf maybe helps more off boost to pick up the tiny differences in flow over the wire. on boost its a tough life for a maf.

what i have found is that adding a few extra rows in the pre boost areas can help to smoothen things and give better big injector fuel economy and running.


i know a 75mm throttle body is good for 1000RWHP on a FI mustang so i presume a 75mm maf a little less. one thing to be aware of with a larger maf you may need a device to swirl the air so that uneven airflow through the maf is avoided.

try summitracing.com i have used them lots for ARP, exhaust wrap and bits n bobs like that. i got my 75mm mustang throttle body from there that i was gonna use on the 16vt.