chris_uk
Premium Member
Registered: 8th Jul 03
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for some reason my boost seems to be loosing pressure.
it shoots up to 15 then drops and drops until i change gear.
ive checked DV for leaks, checked all pipes are fastened propperly,
i have a boost T and it was set to 16PSi
but the boost t has 3 ways, so i blocked one way and the boost stayed at 6psi, regardless if i unscrewed the boost t or tightened it. it stays at 6psi
if i take the plug off the 3rd exit it does as before but if i unscrew the boost t until its almost out i get 16psi then drops until i change or tight 6psi constant.
wht the hell could be wrong.
ive cleaned the boost t made it nice n shiney and cleaned the DV
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corb
Member
Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
User status: Online
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does it back all the way off eventually? could be a bolloxed actuator?
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Nismo
Member
Registered: 12th Sep 02
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sounds like an elctrical fault , check the solinoids
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chris_uk
Premium Member
Registered: 8th Jul 03
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i suppose it would eventually but i gotta change gear at 6k and its at about 5 or 6 when i change.
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chris_uk
Premium Member
Registered: 8th Jul 03
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quote:
Originally posted by Nismo
sounds like an elctrical fault , check the solinoids
were?
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Hayley
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Registered: 27th Jul 05
Location: Cheshire/Lancs
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Its sounding electrical to me as well, either that or you could have a very small hole/gap somewhere, so small you're missing it.
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Jake
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Registered: 24th Jan 05
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you sure you havent got compressor surge?
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corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
User status: Online
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amal valve you thinkin nismole? Apart from that only other electrical thing turbo related is ecu innit?
But if it wont hold the boost, could the spring in the actuator not be getting old and thus slowly backing off as it cant hold the wastegate open?
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chris_uk
Premium Member
Registered: 8th Jul 03
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1. what would the actualtor have todo with it (i gueniunly dont know)
2. why does it sound electrical?
3. compressor surge??
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chris_uk
Premium Member
Registered: 8th Jul 03
User status: Offline
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quote:
Originally posted by corb
amal valve you thinkin nismole? Apart from that only other electrical thing turbo related is ecu innit?
But if it wont hold the boost, could the spring in the actuator not be getting old and thus slowly backing off as it cant hold the wastegate open?
over my head that ... 
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corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
User status: Online
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1. see above!
2. ditto
3. ditto
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Hayley
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Registered: 27th Jul 05
Location: Cheshire/Lancs
User status: Offline
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I recall someone on another fourm ahving a problem very similar, and it turned out to be something going wrong in his ECU, I just figured as it was a simliar problem it could be a similar solution. I can't actually recall what was wrong with his ECU just that it required a new remapped version..
It could be any of the above though, its not always an obvious solution to a problem 
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chris_uk
Premium Member
Registered: 8th Jul 03
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quote:
Originally posted by corb
1. see above!
2. ditto
3. ditto
do you mean the spring in the DV not holding?
or before that?
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Jake
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Registered: 24th Jan 05
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Sounds to me like you got abit of C.S going on. but i dont know much about stuff...
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chris_uk
Premium Member
Registered: 8th Jul 03
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quote:
Originally posted by jake
Sounds to me like you got abit of C.S going on. but i dont know much about stuff...
that doesnt help one bit 
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Nismo
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Registered: 12th Sep 02
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quote:
Originally posted by corb
amal valve you thinkin nismole?
Well possibly , the solinoids that control the boost on my car , when they went i wasnt boosting at all it would shoot up then drop off straight away , replaced them and bingo
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Jake
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Registered: 24th Jan 05
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quote:
Originally posted by chris_uk
quote:
Originally posted by jake
Sounds to me like you got abit of C.S going on. but i dont know much about stuff...
that doesnt help one bit
compressor surge, basically what corb mentioned. Wastegate isnt opening properly (or similar) and the air is getting forced back in the chamber
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chris_uk
Premium Member
Registered: 8th Jul 03
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what would cause the air to be forced back
/???
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Jake
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Registered: 24th Jan 05
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when the butterfly doesnt shut enough and the air gets pushed back
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Jake
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Registered: 24th Jan 05
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but its probably the same problem egg head had.
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chris_uk
Premium Member
Registered: 8th Jul 03
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you mean at the top of that black pipe??
[Edited on 28-07-2005 by chris_uk]
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corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
User status: Online
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you have solenoids controlling your boost? like an electrical actuator or something? Got any pics of that, out of curiosity.
the straight dark line is the actuator arm, on the right attached to the wastegate linkage(dont know the technical term) which in turn opens and closes the wastegate to allow more/less boost. On the very left hand side of the pic, you cant see it cos its dark - ill find you a better pic of that in a second, youve got the actuator spring housing and gubbins. Gimme a minute on that bit though!
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corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
User status: Online
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on the left on the actuator arm you can see the housing etc.
What car/engine am i looking at there chris?
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corb
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Registered: 24th Apr 02
Location: Calgary, Alberta, Canada
User status: Online
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COMPRESSOR SURGE etc.
http://www.corsasport.co.uk/board/viewthread.php?tid=209250&page=3
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chris_uk
Premium Member
Registered: 8th Jul 03
User status: Offline
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the pic i put up is my engine, punto gt 1.4 8v turbo.
the pic you put up is a 2.0 turbo from probably a cav or calibra
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