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aminidab · Mar 8th, 2006, 03:04 PM

Well I dynoed my car again today, iIt didn't go exactly as planned. I had my boost controller set at about 12-13 PSI. A little while after getting into full boost, at about 5500 RPMs it started hesitating and breaking up.
Did about 3 or 4 runs this way, in the middle I noticed the fuel pressure was at about 38, so I turned it down to 35. Still had the same results though. Then I turned down the boost a bit to about 11-11.5 PSI. On this last run, it wasn't perfect but came out a lot better than the earlier runs, even making more power at less boost.
So anyway that best results were 233WHP/226WTQ. Not too bad, up about 20 on each from my previous dyno, which was also at about 11 PSI. I was hoping for more, but
considering I could only run a max of about 11 PSI I'm pretty happy with the results. One other thing.. since replacing the fuel pump, no pinging like I had at my last dyno.

As I was leaving my main guess on the cause of the breakup/hesitation was the spark plug gap being too big. I can't think of too many other things that would cause the car to run fine up to 11 PSI, then run like shit at 12-13. The gap I was running was .030.
On my way home though my car was running good but then it started to run terrible and I figured a IC pipe had popped off. Got home and I was right. So it could have a boost leak was also contributing to this.
So on my to-do list is rework the hot IC piping, this is where the coupler came loose and it has never fit that great.
Also pull the plugs, check the gap and try running it a little smaller and see what happens.
Once I fix these issues I'll be back to the dyno to see what I can do.

I'll post some more info when I get the chance, hopefully tonight. I have the dyno charts, one with breaking up(max was 223WHP/231WTQ) and the 11PSI one and data logging on each dyno run, also some details on my setup.
I meant to get some videos of the dyno but my friend with the video camera wasn't able to make it at the last minute. I took some videos with my digital camera, but those kinda suck. If they are worth anything I'll post them, otherwise I can at least post audio clips if anyone is interested.

Mar 8th, 2006, 03:04 PM	#3 (permalink)
aminidab Destroyer of Engines Join Date: Apr 2002 Location: Austin, TX Posts: 561	GA16DE-T Dyno Well I dynoed my car again today, iIt didn't go exactly as planned. I had my boost controller set at about 12-13 PSI. A little while after getting into full boost, at about 5500 RPMs it started hesitating and breaking up. Did about 3 or 4 runs this way, in the middle I noticed the fuel pressure was at about 38, so I turned it down to 35. Still had the same results though. Then I turned down the boost a bit to about 11-11.5 PSI. On this last run, it wasn't perfect but came out a lot better than the earlier runs, even making more power at less boost. So anyway that best results were 233WHP/226WTQ. Not too bad, up about 20 on each from my previous dyno, which was also at about 11 PSI. I was hoping for more, but considering I could only run a max of about 11 PSI I'm pretty happy with the results. One other thing.. since replacing the fuel pump, no pinging like I had at my last dyno. As I was leaving my main guess on the cause of the breakup/hesitation was the spark plug gap being too big. I can't think of too many other things that would cause the car to run fine up to 11 PSI, then run like shit at 12-13. The gap I was running was .030. On my way home though my car was running good but then it started to run terrible and I figured a IC pipe had popped off. Got home and I was right. So it could have a boost leak was also contributing to this. So on my to-do list is rework the hot IC piping, this is where the coupler came loose and it has never fit that great. Also pull the plugs, check the gap and try running it a little smaller and see what happens. Once I fix these issues I'll be back to the dyno to see what I can do. I'll post some more info when I get the chance, hopefully tonight. I have the dyno charts, one with breaking up(max was 223WHP/231WTQ) and the 11PSI one and data logging on each dyno run, also some details on my setup. I meant to get some videos of the dyno but my friend with the video camera wasn't able to make it at the last minute. I took some videos with my digital camera, but those kinda suck. If they are worth anything I'll post them, otherwise I can at least post audio clips if anyone is interested. __________________ 2008 BMW 135i 96 Sentra GXE Boost is addictive 265WHP/257WTQ