Boost Wtf?

[JonnoHR31]

99% of time the problems arise when they havent been setup properly. if you take the time to read the guides on here and understand how it works then it gets pretty easy after a while to perfect.

most tuners simply cbf taking the car out on the road to set it up, when i had my car tuned ages the tuner just adjusted the set and didnt put any gain into it at all. picked up a good 400rpm spool re doing it myself

[GTRAAH]

Im using Garrets -5.... So before i launch on the street turn the gain slightly lower then reset peak and see what it peaks at keep repeating till it is at desired peak? i wish i knoew more about this shit, im sik of this tuner!

[SiR_RB]

Max boost will be different in every gear, turn the gain down one or two clicks and go through the gears. Make sure u reset ur peak boost until you are happy with the boost level

[MrStabby]

I believe gain trades off opening the wastegate early or late. If you open early you don't get to full boost as quickly as possible, if you open too late you get a spike. So yeah, keep turning it down until you get a very small spike.

[STATUS]

It seems like this is becoming a weekly thread where people are getting similar results with Profec B's, maybe we should rethink recommending these shitty things... I have had nothing but trouble with mine, two sets of turbos, shortest possible lines, actuators, tuners, bla-bla-bla...

It is true that boost should be checked on the road by the tuner after dynoing in the perfect world, as spikes often happen with different load on the street.

With my old turbo setup i tuned the boost curve much flatter (MFD graph) by lowering the gain slightly and the boost level that the wastegate begins to open at. Give it a go.

BTW, what turbos and actuators are you using?

seriously one of the simplest boost controllers..... generally they are fine. But they cant compensate for a badly set-up actuator system or incorrect pre-loads.... no controller can. The Blitz is by far the best but the Profec B comes in a close second.

the thing that confuses most is the gain (rate of ramp) and set boost or start boost (boost level it will start to control) often the gain is to high and it spikes or the start boost is too close from the final boost level.

[GTRAAH]

Ok i turned the gain down by 3% and nothing happened at all. I was told not to turn it down too much otherwise it needs a retune?