T5's BOOST QUESTION
#1
#2
#5
C70 T5 COPUE 2.3L 2001 ME7.0 BOSCH ECU
1st gear holding at 3000rpm foot flat down to 6000rpm with 0 psi boost pressure straight into 2nd gear negative boost pressure unto 3500rpm vacuum at 20-25 inHg boost pressure then climbs upto 0 psi at 4500rpm keeping on the throttle to 6 grand into 3rd climbing between 3000-4000rpm i start to get positive boost pressure upto 8 psi @max rpm. Ive looked at the ECU NO fault codes stored ,also pipes ,hoses arnt a questions all brand new and secured with high pressure hydraulic hose clamps new actuator diafram no smoke from turbo or any in pipes I have also done a full vacuum system test by pressurising through the turbo i did find a minor leak @ the intercooler but repaired that.the only thinkl concerning me to this fault it the boost control selonoid situated side of air filter box but i would have thought a fault would have come up if malfuncting
1st gear holding at 3000rpm foot flat down to 6000rpm with 0 psi boost pressure straight into 2nd gear negative boost pressure unto 3500rpm vacuum at 20-25 inHg boost pressure then climbs upto 0 psi at 4500rpm keeping on the throttle to 6 grand into 3rd climbing between 3000-4000rpm i start to get positive boost pressure upto 8 psi @max rpm. Ive looked at the ECU NO fault codes stored ,also pipes ,hoses arnt a questions all brand new and secured with high pressure hydraulic hose clamps new actuator diafram no smoke from turbo or any in pipes I have also done a full vacuum system test by pressurising through the turbo i did find a minor leak @ the intercooler but repaired that.the only thinkl concerning me to this fault it the boost control selonoid situated side of air filter box but i would have thought a fault would have come up if malfuncting
#9
I am going to hazard a guess and say you have a vac leak somewhere (like the line to the boost gauge), causing it to read funny.
Drive the car around -- is there a notable difference in acceleration and general performance when the gauge reads 8psi in 3rd vs. 0psi in 1st and 2nd? If there is, it's a turbo problem (meaning the gauge is reading right, and something wrong with your boost system), and if there isn't, then it's a gauge problem (meaning you're pushing the same amount of boost, but your gauge is telling you otherwise).
Drive the car around -- is there a notable difference in acceleration and general performance when the gauge reads 8psi in 3rd vs. 0psi in 1st and 2nd? If there is, it's a turbo problem (meaning the gauge is reading right, and something wrong with your boost system), and if there isn't, then it's a gauge problem (meaning you're pushing the same amount of boost, but your gauge is telling you otherwise).
#11
Alright then, it's a turbo issue.
maybe you have an exhaust leak somewhere? I can't think of any logical reason why you would boost differently at the same RPMs in different gears.
Maybe your boost computer is messed up?
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