mrc24x

Saturday I went to a different shop to get a Certification run since the last shop had a problem with there weather station. I'm pretty happy with the numbers now but I'm concerned with the lean condition. I installed a high output pump from Racetronix and I have the new style Holley AFPR but it won't go over 41psi. My first thoughts are that the larger adjustable "****" on the regulator is hitting the body of the regulator and it just won't tighten down anymore. I'll start there but I'm looking for ideas..........

89onlyZ51

Isn't ~14 about spot on for the A/F, esp. on a MAF car?

STL94LT1

12.5-13:1 A/F is a better target. 14:1+ is in the danger zone.

hippy

I'm surprised you are making that kinda power. The RPM doesn't surprise me but the actual RWHP does, congrats. You're about 20 over what I'd expect from a LTR intake.
I'd be a little concerned about 14-1 but the saying I use is "lean is mean." 13-1 may lose a little RWHP, maybe not, your car surprises me already.

mrc24x

Thanks Hippy. I wasn't sure how this would turn out. I know you and a couple others from CF haven't had much luck w/ this combo (277-287 rwhp) but there are two guys over at thirdgen that have this similar setup and they are around 325rwhp/380tq. The only thing I did different from the thirdgen guys is that I didn't siamese my base/runners and I added 1.65 rr's for the exhaust. I feel pretty good about the powerband, 5600rpm is as high as I want to go since I'm running the $800 2 bolt short block from Pace.

If I can scrape together some extra play money I would like to make my original block a forged / splayed 369 w/ HSR and the current heads,cam, etc.....

_twisted_

When you installed the AFPR was there a flat washer about the size of a quarter in the kit? 41 is way to low for having an adjustable regulator. it that checks out - verify you are getting good voltage to the pump

Aardwolf

Did you clearance the regulator? It is to high and hits the back of plenum. I had to remove quite a lot of material there on the plenum. Maybe it is binding. I have mine at 46 PSI with no trouble.

TA

You definitly have to do a good bit of grinding on the underside of the plenum with that AFPR

hippy

Mine was auto though so I figured if I had a stick that would put me around 300rwhp. The one thing I didn't have on my car that probably would have benefited me would have been a true dual, I had a 2 into 1 junk setup. Regardless, your pull is still pretty decent.

mrc24x

I did have to grind a lot off the plenum so that isn't a problem I guess it's time to pull it apart again to see if I put the washer in.....I hope it's something simple. Then on to the voltage. Thanks for the advice.