Got about 12 pulls on a mustang dyno today.

Car dyno'd 200whp w/ K&N FIPK on Dynjet.

First 3 pulls today I got 182whp, was hitting low 10's on A/F, did one full turn counter clockwise on RRFPR and pulled 220whp.

Hooked up a boost gauge and it's hitting about 5psi @ 9000.

It's obviously reading way low, as it's much faster than it was N/A- what I thought was hugely impressive was how much a turn on the RRFPR made. 40whp. (Dyno'd 3 times and consistently put down 22xwhp. A/F is now high 10's low 11's.

 

So, you're making only 20 whp with a supercharger than before the supercharger?

 

sonething is VERY wrong, my car makes 221rwhp(mustang dyno) NA!!

 

Something is obviously very wrong with the dyno, as @ 181whp, I'm much faster than I was @ 200whp N/A. (Raced the same people before and after, done an unofficial quarter mile and trapped much higher than possible before, can hit 145mph with the top down, whereas before I couldn't go past 135mph) The car is not making less power.

 

Am I not understanding something here......?
So you installed a S/C and now you have less whp....?

 

<sigh>Pretty sure something is ^ with the dyno. Was more interested in baseline versus changing RRFPR.

 

Your baseline on the Mustang would have been less that a Dynojet. Probably closer to 175rwhp.

Your first 3 pulls would have been close to what you were stock. Post the dyno sheet and maybe we can help you figure this out. You should be pushing 260-270 on that Mustang dyno so where is the missing 50 hp or more?

 

Do you typicaly get more or less on a mustang dyno? I got 288 whp with just the charger and exhaust on a dynojet.

 

You typically get lower numbers on a mustang dyno than you do on a dyno jet.