okay, so I want to up the boost on my Transporter 2.5 TDi but I'm not sure how to do it safely, this is why.

My system has a boost ref pipe that feeds the ECU, I've "T" into this just before the ECU to run pipe for my boost gauge. I think this has effected the control by placing a small reservoir in the small diameter pipework which is creating a delayed reaction type scenario. If I plant the throttle at around 2,000rpm I can sometimes get a boost spike of 1bar shown on the gauge. I'm not sure if this was there before but I suspect not.

So First problem is my accidental boost spike.

Next is the ECU sets the boost at 0.8 for 2,000rpm and reduces to 0.6 as it reaches 3,000rpm and up.

So if I use a bleed valve and set it to give 1bar at high revs then I may get 1.2bar at low revs and 1.4 bar spike.

What I really want if possible is about 1 bar across the rev range.

Manual Boost Controller? - I'm not sure how an MBC would integrate with my system, as the waste gate is pressure controlled I guess it would have to bleed off the pressure applied to the wastegate - this would work for about 30 seconds by which time the ECU would have tripped into limp mode.

So I sort of need a MBC and a boost ref bleed valve. It all sound like it's going to be an absolute pig to balance but maybe possible?

So is there any sensible way of doing this without a remap?

Thanks

Rich.