okay well i have a full built b16 with a percision 6262 turbo one month old and everytime i hit boost my car only going to 5psi (8psi spring) then at 45-6k rpm it will cut off and go back to vacum 20

car has
3 bar gm map
880 injectors
walbro 255
tail waste gate that works tried diffrent wast gastes
greedy type rs bov
custom intercooler
custom manifold
68mm throtle body
skunk 2 intake mani
and
built block built head

please help out

stumped on this changed spark plugs changed out map waste gates and some other things

 

sound like boost cut on the map what ECU are you running '

 

its on a p28 and i have tryed 3 diffrent tuners and its still doing

 

double check timing

 

checked the timing all good-__-

 

I was having a problem like this, But my car has a boost cut at 15psi & it was cutting at about 10psi. Ended up having a hole in the line going to the boost gauge and boost was actually higher then it was reading. So I replaced the line and turned down the boost. Now it runs fine.

 

on my car you can feel the hole car die i wish it was that but you can feel the hole car just cut out

 

Is it tune?

 

street tuned it started doing that and we couldnt figure it out went to another tuner still did it went to king performance they made a bass map an still did it

 

1. Check for boost leaks.

2. Make sure TPS is calibrated and working correctly.

3. Switch back to oem MAP sensor, and have a tune that reflects this change.

 

no boost leaks
going to get it hooked up on the live feed to find out about the tps and i have changed maps but ill try a stock map tomorrow

thanks for the feed back