Hesitation near redline

[sr20detmaybe]

I started to up the boost today on my profec b 2, i set low at 10 psi and high at 13 psi, i did a few pulls to redline, like 10. after 20 minutes of driving, the car would hesitate more and more as i reved to redline, now it wont rev past 4500~4600 from 3rd to 5th and 2nd will rev to like ~5300. 1st will rev almost all the way to 6500 which is where i stop revin it. When it stops revin higher, it pops and studders badly. I pulled the 1st spark plug and it was very black. Is it running very rich? Think i have a boostleak?I tried to check for codes on my car but I have no LED on my ecu. Is there any other way to check for codes or do i have to take it to some1 and have them put a LED in it and where does it go if i have to get this done. Also, what is the largest turbo that is basically bolt on? Is it a GT2871r? THanks all.

[drifter808]

your engine could be knocking like crazy and causing itself to retard the timing

[sr20detmaybe]

My safc2 shows no knock on my runs, maybe as high as 10 knock after these runs at idle but once i start to boost, the knock goes to 0.

[sr20detmaybe]

UPDATE: found a large rip in the coupler between the turbo outlet and the hotpipe, going to replace it now and see how the car acts.

[xxchurroxx]

i'm having the same issue. please post your results as soon as you find out.

[sr20detmaybe]

yeh, this is what was wrong with my car. i got the swap done about 2 weeks ago, and then the car started to feel slower. i thought i was getting use to the extra power but i guess the coupler was ripping more and more. Feels like a whole new car now. XxChurroxX , do a boost leak test. this might help for something not as obvious as a big ripped coupler like mine.

[xxchurroxx]

thanks man. i shall do that.

[xxchurroxx]

well it turns out that not having the correct gapping between spark plugs will give u the same indications...in my case, too much gap. apparently under high load, it will not cause a spark. problem solved =)