i used to have a fujitsu cat back exhaust on my car and was running between 1.1- 1.2 bar, ive now fitted a hks superdragger cat back and lost boost, im now only boosting 0.9 bar, ive fitted a hks induction kit, and a hks bov and its still the same, any ideas pleese????????

 

reset the ecu ?

 

bttt

 

ive done that , still the same

 

If your new system is less restrictive then the boost will drop, I think. You may have the same performance just at a lower boost. When I fitted my exhaust and intercooler piping the peaks were higher but settled lower - maybe the ECU set the boost lower to compensate for the peaks. Fitted an MBC and just upped the boost again. Did you notice that you get more overboost due to the extra flow?

 

ive not had overboost, and what is a mbc, i dont know whether a blitz nur spec would be any better

 

i felt before it used to really throw you back in the seat where as now its lost that, i put the old exhaust back on and its back to normal, im puzzled , i thought hks was supposed to improve performance not take it away,especially at what it cost me

 

Improve over standard, but Fujistibo is a performance exhaust anyway.

The super dragger is the "legal" exhaust that HKS do, so is probably not as good as a their other one the name of which escapes me.

Less restriction should generally mean more boost, but you can get overboost followed by under boost (oscillation) if the change is too great.

Given that you have a non standard ECU, comparisons are harder to make, but I would say stick with the old system and just replace the downpipe.

Paul

 

but im stuck with either a hks or a blitz and my old system is knackered and has rusted out, which is the better one of the two
bttt

 

The 'other one' is HKS Hyper

 

whats the difference between them both?

 

bttt