Darren
Member
Registered: 21st Apr 02
Location: Hadleigh, Suffolk
User status: Offline
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Standard c20let in a corsa. Boosts upto around 11/12psi then falls down to 5/6psi and then slowing climbs back up again, is that ok?
ALso, the header tank was almost empty and had like crusty custard in the bottom??
Cheers
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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my mates in his 200sx his 11psi, then dies off towards the top of the rev rabge
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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sounds like overboost. Dunno if thats a std thing on the c20let...
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PaulW
Member
Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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from what i read somewhere & remember...
9psi is standard boost on the LET with about 12psi overboost.
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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just get a bleed valve or EBC fitted.... constant 11psi 
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CRB 553
Member
Registered: 5th Apr 02
Location: NE Drives: Punto GT
User status: Offline
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C20LET should be
0.6bar/ 9psi constant
0.9bar/ 13psi overboost
[Edited on 07-12-2004 by CRB 553]
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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1bar=14.5psi
8.7psi constant
10.05psi overboost
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CRB 553
Member
Registered: 5th Apr 02
Location: NE Drives: Punto GT
User status: Offline
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overboost is nearer 13psi standard
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CRB 553
Member
Registered: 5th Apr 02
Location: NE Drives: Punto GT
User status: Offline
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1. Drive the vehicle until a normal water temperature reading is attained.
2. Choose a long straight empty road (preferably with a gentle incline). Steady the engine speed to around 3000 rev/min and select either third or fourth gear, depending on road speed.
3. Using your left foot on the brake pedal, gently increase throttle whilst applying the brakes to maintain 3000 revs/min.
4. When full throttle is reached at 3000 rev/min check the boost reading on the gauge.
5. If the boost pressure requires adjustment, consult the manufacture's recommendations.
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miles
Member
Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
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Thats a odd way of doing things CRB.
Overboost should be tested in 5th or 6th, at about 3000rpm floor it, it should overboost then drop and hold a certain value, it might tail off high up the rev range as the turbo cant keep up.
It shouldn't overboost, drop and then rise again. It should overboost, drop and hold.
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CRB 553
Member
Registered: 5th Apr 02
Location: NE Drives: Punto GT
User status: Offline
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miles, that was procedure for measuring constant boost pressure i believe, not overboost.
You have more insight into this than me i just got the above from turbotechnics website
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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just boot it in top gear from low revs and watch what happens...
My GT is over boosting to 22psi, holding 20psi today 
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Darren
Member
Registered: 21st Apr 02
Location: Hadleigh, Suffolk
User status: Offline
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cheers, ill give it a whirl a bit later 
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