I just got my car tuned and I was wondering if the numbers are normal to what others have squeezed out of their cars. I have an AP1 with a Comptech blower on 10psi, intercooled. Test pipe, HKS exhaust, RC550s, and an AEM EMS 2. The car made 330whp on the dyno today. It's actually still at the shop. Please post your numbers to compare. My issue is that while it was being tuned, the first pull had a result of 330whp (the motor was cool). The rest of the pulls were 295whp (with the motor warm, obviously). The tuner, who is well-known for tuning on AEM, said that everything was fine and that they contacted AEM about it too and got no answer as to why it would be that far off. I'm trying to figure this out since it's such a big difference in power. Would it really jump down THAT much after warming up?

 

I made 343whp on 7 psi stock pulley. Vortech sc, aem 1052, HKS dual exhaust and test pipe ID 1000cc injectors. Dyna pack dyno. Getting retuned next monday at 12.5 psi pulley.

 

with supercharger the average is around 350whp

 

About dropping in power like that, that does seem really weird. During my tuning I kept making power until the very last pull when it went down like 3whp or so. Unless it was running really lean or something at first making more power and he had to make the tune much safer thus losing some power idk besides that.

 

Did the tuner have fans pointed at the cars radiator?

 

i only have to ask because it has happened at a shop local to me before (not my car but a buddies)- did he put the e brake on before the second pull? a shop out here (went out of business- go figure) made several pulls with the ebrake engaged.

 

If you were aftercooled, then you probably could have hit atleast 350whp at 10psi. Your injector duty is probably over 80% too.

 

If your only running the standard much smaller front cooler that cools the water then I am sure its cause of heat soak.

 

Well first of all what kind of Dyno? If it was a lower reading such as a mustang then 330whp would be right in line with the common 350whp/10psi Dynojet readings. As for the 35whp loss, that is pretty drastic, I would find it hard to believe that solely heat soak after one run caused this much drop, it may have been a combination of this along with some tuning adjustments durring that run. Anytime your tuning a hot motor to make safe, power is going to suffer quite a bit. A upgraded heat exchanger such as what SOS sells along with a higher flowing pump will dramatically improve this and would be recommended at your boost level. As a daily driver your fine with the stock heat exchanger, but don't expect to be pushing the best numbers consistently. And I suppose there is always a chance that your motor is sick, running a comp test and looking at the plugs for any visual signs of oil fouling or severe detonation will tell you allot.

 

Did anyone check the belt tension? Sometimes it's the simple things...