Low HP reading at Dyno yesterday
#1
Low HP reading at Dyno yesterday
After quite a few mods and most recently a Scivision MAF and chip, I decided to have my car dynoed, especially to check air/fuels, as I have never had them done. The good news is that A/F's are spot on, but HP was only 198.0, I have always thought my car was a little slower than a couple of my friends 951's, there's done 230HP on the dyno, and always thought it was the AFM(the porsche dealer even thought it was faulty), but after fitting the MAF the car feels exactly the same, not even any better response.
I have done the usual mods, removed the insides from the Cat, 3" cat back exhaust, 38mm Tial Wastegate, MBC bypassing the cycling valve, 3 bar FPR.
Yesterday at the dyno I had the boost maxed at 15.5psi.
I have checked and double checked for vacuum leaks, I also get a couple of flat spots as I accelerate after hitting boost.
Any Ideas?
I have done the usual mods, removed the insides from the Cat, 3" cat back exhaust, 38mm Tial Wastegate, MBC bypassing the cycling valve, 3 bar FPR.
Yesterday at the dyno I had the boost maxed at 15.5psi.
I have checked and double checked for vacuum leaks, I also get a couple of flat spots as I accelerate after hitting boost.
Any Ideas?
#2
I would check for excessive voltage drop on the battery to engine/chassis ground. I had a car that had low numbers and found it had 980mv voltage drop on the ground. Cleaned the ground points and replace the battery cables and the power jumped back up where is should have been.
This problem is more common that people know. I have two 951's recently that have had excessive drop that improved after cleaning.
This problem is more common that people know. I have two 951's recently that have had excessive drop that improved after cleaning.
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#9
mine with same mods at alittle less boost was 219.9rwhp on a dynojet- stock chips/3'' exhaust/ tial 38/ mbc @12psi. I would say yeah it maybe down slightly.
Last edited by xsboost90; 11-28-2007 at 01:35 PM.
#13
With all the safety rules around now, I was not even let into the bay where they do the dyno, all I could do was stand and watch from a roped off area.
I just went back to the shop, they printed out every readout they could for me, except RPM readings, they don't log them, they just run the car flat until the HP tapers off, I was there, the car was revving its **** off!
I just went back to the shop, they printed out every readout they could for me, except RPM readings, they don't log them, they just run the car flat until the HP tapers off, I was there, the car was revving its **** off!
#14
With all the safety rules around now, I was not even let into the bay where they do the dyno, all I could do was stand and watch from a roped off area.
I just went back to the shop, they printed out every readout they could for me, except RPM readings, they don't log them, they just run the car flat until the HP tapers off, I was there, the car was revving its **** off!
I just went back to the shop, they printed out every readout they could for me, except RPM readings, they don't log them, they just run the car flat until the HP tapers off, I was there, the car was revving its **** off!