Guys, Had parts fitted to my car, had it mapped every thing was fine for about 3 weeks and now it only boost to 10psi, and did run just under 20psi before. Even the 10PSI doesnt feel like it pulls.

I thought an air leak, so I took the intercooler off the car replaced all the Jub Clips and hoses for Silicone new one, still no luck. It has a Piesburg 3 port Boost solenoid fitted as well. Checked all pipes coming from the 3 Port, they are all new anyway.

I don;t know what else to check. Don't have an CEL on, starts up fine, no noises.

Any ideas would be great please..

WRX 2003
VF34 Turbo
Sti IC with std DV
OEM Air box still fitted.

 

Actuator.

 

Matt how sure are you mate? Will i have to get a remap again? I do have a forged one on my old TD04

 

Impossible to diagnose over the net but its something worth checking.
You sure a hose hasn't come loose or split, boost solenoid faulty ???

 

Iv got the old 2 port I could try that I guess

 

Split boost/vacuum pipe I think too

wiley

 

Stuck the old 2 port back on and it work but boosting at just under 24psi now. Was at 18ish before

 

Had the same symptoms myself. Car drove fine but felt like there was almost no boost. Checked all hoses, clamps etc multiple times, nothing found

Had it plugged into diagnostics, turned out it was the MAF. Had a new MAF put on, problem solved!

 

Get yourself a new 3 port ordered chap.

 

Just done that mate.

 

Thanks for all the help guys

 

I think the boost solenoid was faulty from day one as the guy said he had problems increasing boost, would i need a map adjustment with another 3 port

 

As long as the car makes the same amount of boost as was mapped for then you'll be fine.

 

Cheers Matt

 

i had an issue with mine a few weeks back, car wouldnt make over 7psi and was about 17 before hand.

i took the maf out and it was filthy. cleaned it with a cotton bud and some isopropanol alcohol spray and it was back to normal.

thank god lol