MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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ive got a 1.6 16v Gsi, and i guess in the future some time i would love to do a C20LET conversion.....but anyway
how do turbos work Exactly???? and do they work differently from other car makes???
i know it is device which is belt driven and spins up and creates forced air induction, but thats all i know? how does the rest work?? intercooler, exaust manifold, boost, psi, turbo sizes...etc
and also would it be possible to make a TWIN turbo on the C20LET engine???
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Kerry
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Registered: 5th Oct 01
Location: Norwich
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Simply put, the turbo utilizes pressure created by the exhaust system to turn an exhaust impeller. The exhaust impeller shares a shaft with an air impeller that receives fresh air. As the exhaust impeller spin increases the air impeller pulls air in and forces air into the engine.
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Kerry
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Registered: 5th Oct 01
Location: Norwich
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http://www.gtr.co.uk/html/faq/turbos.asp
thats quite interestin to read 
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MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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oh i see, so they work on the exaust gasses of the car, which explains the lag for it to spin up,
so do ALL turbos work on the outlet manifold of a car then?
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Kerry
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Location: Norwich
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yes i should imagine so
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MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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do u reckon somebody has done a Twin turbo C20LET on a corsa? or if its even possible?
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Kerry
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Registered: 5th Oct 01
Location: Norwich
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i dont think it has been done and i dont think its possible but hey ho i may be wrong 
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MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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i always hear that turbos ar very unreliable on engines that are not disigned for them?? 
why is this? what goes wrong?? isnt it all just mechanical and a case of bolting it all on and conecting up all the pipes correctly??
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Kerry
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Registered: 5th Oct 01
Location: Norwich
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i wouldnt say unreliable id just say puttin more strain on the engine gives room for more things to go wrong really. as for engines that arnt meant to have them then they prob wont be as strong in the first place
turbos are ok til u start upping boost ect then really u need to uprate all the internals to cope with it
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Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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Turbos get HOT.
N/A engines without proper cooling facilities shall indeed blow up
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Kerry
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Registered: 5th Oct 01
Location: Norwich
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yes i have top mounted intercooler it is shite my car doesnt like it
i really need a front mounted one
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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Monkey - Superchargers are belt driven
Why would you want a twin turbo?? not much point... 1 efficient turbo will work much better.
As said... the main factor to watch is the heat!!!!
I melted 2 pistons, damaged another, took the ends off 3 plugs, fucked 5 valves and took out two turbos
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MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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well ive never seen a twin turbo corsa, and its somthing different i guess!
so big issues with turbos is the heat then
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James_DT
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Registered: 9th Apr 04
Location: Cambridgeshire
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Yeah. If the charge temp gets too high it'll fuck an orginally N/A engine, which is why people fit front-mounted intercoolers. Cool it properly as Jambo said, and it should be fine.
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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c20let engines run better and cooler at higher constant speed, once you idle the temp rises, buts thats ok for these engines, they are designed to cope very well with it
turbo at 1 bar shoves in double amount of air (4litres)
at 2 bar its 6litres and at 3bar  8litres
air goes into airbox, thick pipes lead it to the turbo, its then spun round like fuck,compressed and heated, runs up to the intercooler,air cools down, air goes to throttle body and set amount of boost is let through, the remaining waste either floats about the vacuum pipe if no dump valve is fitted, if there is one it escapes through the dumper, air let through goes to intake manifold and cylinder head, air and fuel meet and there is a bang in the combustion chamber. some of the waste air is passed back through the turbine and some is passed to the exhaust exit, simple enough? 
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
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quote:
Originally posted by MoNkEy MaGiC
oh i see, so they work on the exaust gasses of the car, which explains the lag for it to spin up,
lag is nearly non existant on TD's
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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turbo diesels usually get slated, but i think they are more efficient
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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turbo lag is either where you wait for the turbine wheel to start spinning, or unused boost creeps back down the vacuum pipe and interferes with turbine spin, eg slowing it down, thats why you have dump valves although some tend to be useless
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MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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thanks a lot everyone, u lot so helpfull
i finally know how turbos work now 
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MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
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so...... now how the hell does a supercharger work then
are their any supercharged corsa's about???
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Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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Theres a kit availible from Lexmaul for like £3k!
Only adds 40bhp IIRC and is something silly like £3k fitted.
Superchargers generally give more power lower down the rev range and are considered mre refined than turbos, hence why u see them on like jags and astons the like
Not 100% sure on how they work, belt driven as said above but they are considered "forced induction" too
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Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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oh that kit is for the XE btw
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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A supercharger is the same but uses a belt driver compressor off the crank instead of exhaust gases.
quote:
Originally posted by VenomTurbo
air goes to throttle body and set amount of boost is let through, the remaining waste either floats about the vacuum pipe if no dump valve is fitted, if there is one it escapes through the dumper
Incorrect.
What sets the amount of boost let past the throttle body? Except the obvious position of the butterfly....
The boost is regulated by how much the amal valve uses the actuator to open the wastegate.
Going by what your saying means that the dump valve would be active with the throttle body open, which isn't the case.
The dump valve operates when the throttle is closed. This creates a vacuum in the inlet manifold, which sucks the piston in the dump valve up to open it, and the boost that was pushing against the closed butterfly is allowed to escape.
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J da Silva
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Registered: 10th Apr 03
Location: The FACTory
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i should have added that miles thanks for the correction my bad
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ed
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Registered: 10th Sep 03
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[Edited on 20-06-2004 by 1800ed]
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