Problem: MY00 Turbo 2000, boost not being held on part throttle (example hits 0.7 bar in third and tails off straight away) boost will hold if using WOT!

Boost solenoid has been cleaned and checked, dumpvalve checked and ECU reset with no CELs.

Have been told that the problem is on the induction side a split in a hose maybe, can someone tell me what and where all the induction hoses are located?

If it was a leaking hose I would have thought it would lose boost on WOT as well?

Thanks in advance

Si

 

Is the car standard? Does the boost go higher than 0.7bar during WOT?

 

How far does the boost decay?

http://www.ecutek.com/tuning/oemcompare/ may be useful to you. Note how the part throttle boost compares between 99 and 00.

 

Car is standard apart from full decat and green panel filter. Car will boost to max 0.9 bar on WOT in 4th.

With part throttle the boost tails off to around 0 as soon as it hits either 0.5 bar in 2nd and around about 0.7 bar in 3rd

 

I was gonna say it sounds likes it's doing what it should be. But if it's tailing off to 0, I'm not so sure. Certainly with my own MY00, I never used to get full boost with part throttle. And I didn't think you're supposed to either with stock boost control. If you had a GBE or Dawes fitted however, different story...

 

Should it tail off though while your still acclerating? it may not be tailing off to 0 but it deffinately drops as soon at its either 0.5 or 0.7 bar

 

I have never been very sure about the relationship between power, torque and boost. Dyno graphs ofetn show boost and torque on the same axis. Does this mean they are directly related? Can power still be increasing if boost is falling off or do they have to tail off together? If the ecu map holds peak boost longer does this just increase the time at max torque, or can it increase power as well?

Graham