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Won't boost past 10psi?

624 views 3 replies 2 participants last post by  lowbudgethero 
#1 ·
Hi guys.

Have recently reinstalled all the BPC and plumbing in prep for my stage 3 ecu.

Took the car for a run today with a spare ECU I've got, starts and runs fine, drives alright but won't boost past 10psi in third gear.

1st, 2nd boosts up to about 8, which as I understand it is normal (been a while since I have let the BPC take control!)

3rd, 4th and 5th will only boost and hold at 10psi.

I can't hear any leaks although of course it's a bit difficult to hear that when doing <cough>mph along the dual carriageway!


If it helps, the car has had a new BPC, new silicone piping for the BPC and new plugs.

If it's just a case of needing an adaptation run or something I won't worry too much as the ECU is due in the next week but obviously I want to make sure all is well before that!

Cheers guys.
 
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#2 ·
I think that's actually normal. Even with the mbc my car boost goes back down to just over 10psi in lower gears by redline.
 
#4 ·
for a stock car its normal... thats why when you put the mbc theres such a big difference

now imagine when you'll be getting close to 20psi on your stage 3 :eek:
 
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