Why's my boost climbing after levelling??
12 October 2002, 09:48 PM
#1
After fitting dawes and testing the car (94 wrx) boost leveled at 0.92bar,
but car has started hitting the fuel cut!
Been out tonight and had a good look at revs and boost readings, in 4th gear put foot down boost rises fast and stops at 0.92bar at around 3,500rpm, then with foot planted still, watching the digital boost gauge, boost starts to rise again slowly and car starts accelerating faster, boost rises up to 1.00bar and hits the fuel cut!
Why is this? never had a turbo'd car do this, the boost normally tails off! It literally hits it's peak, stays level then very slowly climbs until it cuts out! It would prob keep climbing if fuel cut was raised!
Thought I could have set dawes wrong but it's not like it's hitting too much boost all at once
but car has started hitting the fuel cut!
Been out tonight and had a good look at revs and boost readings, in 4th gear put foot down boost rises fast and stops at 0.92bar at around 3,500rpm, then with foot planted still, watching the digital boost gauge, boost starts to rise again slowly and car starts accelerating faster, boost rises up to 1.00bar and hits the fuel cut!
Why is this? never had a turbo'd car do this, the boost normally tails off! It literally hits it's peak, stays level then very slowly climbs until it cuts out! It would prob keep climbing if fuel cut was raised!
Thought I could have set dawes wrong but it's not like it's hitting too much boost all at once
12 October 2002, 10:44 PM
#2
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sounds like boost creep. !
restrictor needs a drill shoved up it's **** I think.
Somebody else like to confirm tho before you go attacking your turbo
Andy
restrictor needs a drill shoved up it's **** I think.
Somebody else like to confirm tho before you go attacking your turbo
Andy
12 October 2002, 11:51 PM
#6
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had the same prob when i fitted my dawes, i shortened the pipe between the dawes and the actuator and found it was a little loose!
changed the piping for good quality silicone pipe and the problem dissappeared!!!
must have been leaking on high boost!
changed the piping for good quality silicone pipe and the problem dissappeared!!!
must have been leaking on high boost!
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13 October 2002, 03:08 AM
#8
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Boost creep is caused by the inability of the wastegate or wastegate actuator to bypass enough exhaust gas flow around the turbine wheel. Boost creep is made worse by extemely free flowing exhaust and intake.
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