On my PSI Powerbox there is a "floating" black wire (although documentation calls it a grey wire!) which can be earthed it then apparently switches the PSI Powerbox off. Never tried it but have run the car without the box and its pants.

Sorted............ I changed the in tank fuel pump, using Canyon's excellent through the floor method, from his template thread. The car's "performance" has been restored and I am now getting an average of 30 to the gallon, best it's been for about 18 month's. Wish I had changed it before...

Sorted............ I changed the in tank fuel pump, using Canyon's excellent through the floor method, from his template thread. The car's "performance" has been restored and I am now getting an average of 30 to the gallon, best it's been for about 18 month's. Wish I had changed it before...

Tommo138 thanks for your post, I did replace the pipe even though it appeared OK on inspection, just to be sure. Where did you get the MAP sensor from and more importantly at what cost! Thanks

PSI Powerbox returned from Powersport and was said to be OK but out of adjustment. Re fitted to car, no difference. Now believe fault to be the in tank lift pump, will replace and update.

Thanks Wammers for confirming my suspicions about the pump, I have ordered a replacement, will post results when fitted

I have had the car for over 3 years and up until a few months ago it would always average high 20's now it's in the low 20's. I am just surprised it still run's as "well" as it does with the lift pump fuse and relay removed. I am 99% sure the impeller has dropped off the end of the pump motor...

My 2001 2.5 DHSE has been down on power and low MPG for several months, I have checked most of the obvious things people have suggested on this forum (Replaced turbo hoses, cleaned out intercooler, replaced MAP sensor pipe, cleaned MAF sensor) without success. I am now thinking it could be the...

Update: Car is Auto and tick over is fine. Haven't checked the pipes DougK suggests yet (assume the lower 2" pipe is the one which connects directly onto the Turbo?). Renewed the pipe to the MAP sensor which appeared OK this made no difference. However spoke to the PSI Powerbox people about...

Cars done 85,000, no signs of oil around turbo, hoses look OK, slight bulging on all rubber turbo hoses when engine revved. Intercooler cleaned out about 4 months ago when I had to replace the engine oil cooler due to an oil leak.

Yes, both changed only 2 weeks ago, made no difference.

My 2001 2.5 DHSE over the last few months has been losing power whilst MPG has fallen from an average of high 20's to low 20's (with A/C off), I've owned it for over 3 years and it has a PSI Powerbox fitted. It now struggles up hills it used to go up without problems and overtaking is a no no...

Excellent, thanks for that.

Hi, does anybody know if the PSI Powerbox by Motorsport can be adjusted to give even better performance? I have opened mine up by removing the 4 screws on the lid and can see a red & green LED and a small (adjustable?) screw type potentiometer. I haven't had the nerve to turn the screw as I...

Thanks Irishrover I will give them a go.

Hi, has anybody uprated the original H4 60/55 wattage main/dip headlight bulbs on a P38 RR to the readily available H4 100/90 wattage bulbs? I understand they will obviously be brighter, but I am concerned with the extra current they will draw causing problems with the BeCM unit, as on a P38...