MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by Kris TD
yes it would slow you down as it dumps all the boost so the turbo has too spool up again.
Doesnt on mine 
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vibrio
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quote:
Originally posted by VenomTurbo
recircs are gay
your gay as is your dad
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vibrio
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quote:
Originally posted by MattyB
quote:
Originally posted by Kris TD
yes it would slow you down as it dumps all the boost so the turbo has too spool up again.
Doesnt on mine
out of interest have you ever driven the car without it
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vibrio
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quote:
Originally posted by vibrio
quote:
Originally posted by MattyB
quote:
Originally posted by Kris TD
yes it would slow you down as it dumps all the boost so the turbo has too spool up again.
Doesnt on mine
out of interest have you ever driven the car without it
just read down a few posts 
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vibrio
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quote:
Originally posted by MattyB
quote:
Originally posted by Adam
it's the fact that there is no throttle that they don't need or can have a dv
yep - they can have a d/v, its just forced operation.
There is no need for an atmos D/V on a petrol turbo either.
there is a need for a DV (atmops or recirc) on petrol engines
[Edited on 08-12-2003 by vibrio]
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by vibrio
quote:
Originally posted by MattyB
quote:
Originally posted by Adam
it's the fact that there is no throttle that they don't need or can have a dv
yep - they can have a d/v, its just forced operation.
There is no need for an atmos D/V on a petrol turbo either.
there is a need for a DV on petrol engines
It was you who was telling me in a previous thread that atmos d/v's on turbo petrol cars are just as useless, as they too dump stored boost, meaning turbo must spin back up (exactly the same as a TD).
Maybe you are talkin bout turbo stall??
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vibrio
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quote:
Originally posted by MattyB
quote:
Originally posted by vibrio
quote:
Originally posted by MattyB
quote:
Originally posted by Adam
it's the fact that there is no throttle that they don't need or can have a dv
yep - they can have a d/v, its just forced operation.
There is no need for an atmos D/V on a petrol turbo either.
there is a need for a DV on petrol engines
It was you who was telling me in a previous thread that atmos d/v's on turbo petrol cars are just as useless, as they too dump stored boost, meaning turbo must spin back up (exactly the same as a TD).
Maybe you are talkin bout turbo stall??
yes atmos DV's dump the boost to the air soincrease turbo lag between gear changes but they are still required. I would not run a petrol turbo car without some sort of DV
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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it would totally shag the turbo on a petrol if some kind of dv was not fitted. all turbo petrols come with them as standard.
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MattyB
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Location: 118.5bhp :D
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why are they still required? Reduce stresses on the turbo? Reduce turbo stall (fin damage)?
Turbo lag as u so rightly put it, is a bad thing, but d/vs on tds have a negligable impact on the lag time. If any.
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by Kris TD
it would totally shag the turbo on a petrol if some kind of dv was not fitted. all turbo petrols come with them as standard.
What does a TD have fitted as standard from the factory? (to release boost)
[Edited on 08-12-2003 by MattyB]
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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nothing, IT DOESNT NEED ONE, there is no throttle butterfly to close, therefore no vacuum is formed, therefore no turbo damage from not dumping the excess boost.
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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the only thing they have is a wastegate, same as every turbo, but this is only too limit boost pressures.
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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So, with my D/V TURNED OFF, when i accelerate to 4.3k revs in 3rd under load and get to bout 1.1bar boost, then drop into neutral (foot off accelerator), why do my boost levels fall?
A wastegate does what? prevent over boost by lettin pressure out at a certain PSi?
[Edited on 08-12-2003 by MattyB]
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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so all in all its not worth it?
ah stuff it i need a cheap run about diesel fits the bill
its a little faster than my current car
and i know corsa's inside out
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by MattyB
why are they still required? Reduce stresses on the turbo? Reduce turbo stall (fin damage)?
ttt.
Why does boost "shag" the turbo in a petrol car?
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by Adam-D
so all in all its not worth it?
ah stuff it i need a cheap run about diesel fits the bill
its a little faster than my current car
and i know corsa's inside out
There are no kits for the corsa yet Ad, so even if u wanted one, u cant have it! lol
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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quote:
Originally posted by MattyB
So, with my D/V TURNED OFF, when i accelerate to 4.3k revs in 3rd under load and get to bout 1.1bar boost, then drop into neutral (foot off accelerator), why do my boost levels fall?
A wastegate does what? prevent over boost by lettin pressure out at a certain PSi?
[Edited on 08-12-2003 by MattyB]
please dont tell me you are asking why does the boost level drop when you take you foot off the accelerator.
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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matty, that guy where you got ures told me that the only thing you need to do to adapt it for other cars is a bracket.
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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when you lift of the gas you are not putting load on the engine, hence it needs less fuel, therefore less air, turbo doesnt need to pump air in so the boost levels drop to nothing.
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by Kris TD
quote:
Originally posted by MattyB
So, with my D/V TURNED OFF, when i accelerate to 4.3k revs in 3rd under load and get to bout 1.1bar boost, then drop into neutral (foot off accelerator), why do my boost levels fall?
A wastegate does what? prevent over boost by lettin pressure out at a certain PSi?
[Edited on 08-12-2003 by MattyB]
please dont tell me you are asking why does the boost level drop when you take you foot off the accelerator.
yeah i am asking that!! - where does the boost go!? Coz u said, in standard form a TD has no form of pressure release???
Obviously with your foot off the accelerator, there is no exhaust gases spinning the turbo up (producing boost), but what bout the 1.1bar of boost already in the system in a TD? Or just straight into the engine?
Matt
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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erm, the air get used to combust the fuel.
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vibrio
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Registered: 28th Feb 01
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quote:
Originally posted by MattyB
So, with my D/V TURNED OFF, when i accelerate to 4.3k revs in 3rd under load and get to bout 1.1bar boost, then drop into neutral (foot off accelerator), why do my boost levels fall?
A wastegate does what? prevent over boost by lettin pressure out at a certain PSi?
[Edited on 08-12-2003 by MattyB]
your boost leves drop cause the exhaust gases produced in neutral do not spin the turbo
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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quote:
Originally posted by Kris TD
matty, that guy where you got ures told me that the only thing you need to do to adapt it for other cars is a bracket.
in that case, i guess its the same princible on all TD engines with a mechanical fuel pump (altho i doubt the accelerator arm + micro switch set up wud be the same??) -> the kit on mine seemed very tailored to the D8A bosch fuel pump.
but i've never seen a 1.5 izusu engine I/P before.
Matt
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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it works of the throttle cable, not the fuel pump.
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
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who needs a dv anyway when you have the ptish over overboost from the safety valve
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