I am currenting having problems with my hp at 14psi of boost. I pull strong at around 10 to 11 psi of boost and after 11psi, my car does not pull as hard. I am hitting 14psi, I checked all the couplers and BOV, but still cannot find the problem or any leak.

I am going to check out what the problem again this week. Herbenny and I will diagnosis the MSD ignition or spark plugs, but if anyone has the similar problem, any suggestions would be greatly appreciated. Thanks

Leo

 

If you are running your stock turbo's your turbo's may be showing wear and causing inefficiency. Check the shaft play on them. This is just an idea and I don't know if it is the right place to look.

Tell Herb I said hi.

 

Thanks, I will check in on that...

Oh yeah my idling is also really rough, it fluctuate a lot. When I set the throttle at 1200rpm, it will stay for a few days and then start fluctuating below 1000rpm. Then I have to set it again.

 

Hmmm......I notice your sig includes the line "still needs to be tuned..."

I would suggest that you get your car tuned and see how it runs after that.....

 

I actually have someone's basemap on there. I had it tuned at 11psi at 300rwhp. Even though it is not fine tuned, it should be around 340rwp at 14psi.

 

If you are reading 14psi off of your PFC and that is your only method of getting a boost reading then I can almost guarantee you that reading is wrong. You really need a boost gauge to effectively read your boost and a separate boost controller to control it. The PFC's boost reading is known to be off. You are probably over boosting and leaning out.

I agree with rynberg that your problem is most likely a tuning issue.

 

I actually got a boost guage that read around 14 to 15psi.

 

Your BNR's need to be tuned properly, try that and if it doesn't work check back with.

Tell Herb that I said hi and that I love his intercooler.

 

I agree with the others about getting the ECU tuned for your mods/car.

However, you might hook up a temporary fuel pressure gauge and make sure you aren't dropping pressure at those upper boost levels.

 

Thanks guys, I will give those suggestions a shot, hopefully it is nothing major.