This weekend, a couple of very resourceful and helpful chappies fitted a BPM twin dump DP to my MY95 WRX. I was previously running a single dump (blanked wastegate) Magnex DP.

I have not yet had a chance to give the car a good spanking (had the missus with me on every run since the install), however, I have noticed a change in boost.....

On the way back from having the DP fitted, on the motorway, about 100 or so, foot down, boosted to 18psi then dropped to 14 and started to build up? I have never seen this before? The ECU then cut the boost and almost shoved me through the windscreen!

During the couple of small runs I have had since, the car does not appear to be producing as much boost as it did with the Magnex in place....? With the Magnex, it was boosting to 16/17psi the holding at 14. Now with the BPM it is boosting to 15/16 psi and holding at about 13.... the car does not feel any slower....

Anyone had an experience like this?

I am sure the DP is not leaking at the turbo (arnt we David !)

Cheers

Paul

 

There is a thread that might give you some clues here http://www.scoobynet.co.uk/bbs/threa...threadid=56686

 

deo you have a lambda link fitted?

If you are overboosting now, that suggests the boost is climbing to higher than it was, perhaps the normal cures for overboost might help.

 

I only had the overboost once, I had it before once with the Magnex on (cold foggy morning on the motorway at *cough speeds.

My concern is that the boost appears to be lower than it was with the single DP?

P