MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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The throttle cable obviously operates the fuel pump, and the whole electronic side of the DV kit gubbins is situated on the fuel pump itself. (2 sepearate metal arms that the switch is connected to)
The micro switch and accelerator cable arm use a metal bracket and micro switch, which are such a size, so as to fit onto the D8A fuel pump.
The throttle cable operated the fuel injection arm on the pump, which is where the micro switch, bracket, solenoid etc are located
Thats wot i meant
[Edited on 08-12-2003 by MattyB]
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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BACK TO MY ORIGINAL QUESTION:
On a petrol turbo engine, once boost has been spun, but the throttle closed, where does the boost go?
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Tom
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Registered: 3rd Apr 02
Location: Wirral, Merseyside
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quote:
Originally posted by vibrio
atmospheric dv's are gay on an car 
yesh  which is why so many people have them
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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its the same as modifying your car.....
its done soley to be different and attract attention.
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
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quote:
Originally posted by MattyB
BACK TO MY ORIGINAL QUESTION:
On a petrol turbo engine, once boost has been spun, but the throttle closed, where does the boost go?
it builds up between the turbo and throttle butterfly or out of the dump valve if there is one, on a diesel there is no throttle to close tho
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Tam the diesel man
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Registered: 31st Jul 01
Location: Portsmouth
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matty b what you done to get 118bhp?? you still got the standard i/c?
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Voyto
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Registered: 9th Feb 03
Location: Stafford
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whats a dv?
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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dump valve
the bit that goes ptshhhhhhhhhhh
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Voyto
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Registered: 9th Feb 03
Location: Stafford
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ooohhh dump valve. sorry 
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Tam the diesel man
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Registered: 31st Jul 01
Location: Portsmouth
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also heard on the diesel dv if you leave your foot off it continues to dump the boost until you reapply the throttle. dunno if this is true
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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
quote:
Originally posted by MattyB
BACK TO MY ORIGINAL QUESTION:
On a petrol turbo engine, once boost has been spun, but the throttle closed, where does the boost go?
it builds up between the turbo and throttle butterfly or out of the dump valve if there is one, on a diesel there is no throttle to close tho
According to Kris:
quote:
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.
Erm? Which one of you thinks they are right? Vibs, can u help out here
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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
erm, the air get used to combust the fuel.
So what your saying is, even without a D/V, the boost would all be released.
I know that with my D/V turned off, boost levels drop pretty rapidly anyway. So - Basically whether i have a dump valve or not, you are saying that the engine will release boost, there fore increasing lag.
Some people are also saying that ALL turbo petrols have a Dump valve as standard OR need one, but they cant explain why???
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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 Tam the diesel man
matty b what you done to get 118bhp?? you still got the standard i/c?
Fuelling and boost reset/adjusted by a derv specialist. Runs 1.1bar boost. Torque also up to 174lb/torque from 144lb/torque.
Results from stage 1 tune vary massively between engines, seen one get 121bhp on rollers, but had viper kit as well. Where as others (usually older ones), only had 114-115bhp (all on same rollers).
I've also fitted a little cheapo raid induction kit. Doubt its increased power on the rollers, but it does seem to rev a lot free-er and drive bit smoother.
Matt
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Tam the diesel man
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Registered: 31st Jul 01
Location: Portsmouth
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with a dv wouldnt the air be vented instead of goin into the engine.
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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 Tam the diesel man
also heard on the diesel dv if you leave your foot off it continues to dump the boost until you reapply the throttle. dunno if this is true
yep thats true 
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
User status: Offline
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quote:
Originally posted by MattyB
quote:
Originally posted by Adam
quote:
Originally posted by MattyB
BACK TO MY ORIGINAL QUESTION:
On a petrol turbo engine, once boost has been spun, but the throttle closed, where does the boost go?
it builds up between the turbo and throttle butterfly or out of the dump valve if there is one, on a diesel there is no throttle to close tho
According to Kris:
quote:
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.
Erm? Which one of you thinks they are right? Vibs, can u help out here
we're both saying the same thing, if someone does a turbo conversion they might not fit a Dv, 99% will tho but it's not an essential for a petrol turbo
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Tam the diesel man
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Registered: 31st Jul 01
Location: Portsmouth
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my head hurts
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
User status: Offline
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quote:
Originally posted by Tam the diesel man
with a dv wouldnt the air be vented instead of goin into the engine.
yes mate, thats wot 'atmospheric' means.
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MattyB
Member
Registered: 13th Nov 01
Location: 118.5bhp :D
User status: Offline
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quote:
Originally posted by Adam
quote:
Originally posted by MattyB
quote:
Originally posted by Adam
quote:
Originally posted by MattyB
BACK TO MY ORIGINAL QUESTION:
On a petrol turbo engine, once boost has been spun, but the throttle closed, where does the boost go?
it builds up between the turbo and throttle butterfly or out of the dump valve if there is one, on a diesel there is no throttle to close tho
According to Kris:
quote:
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.
Erm? Which one of you thinks they are right? Vibs, can u help out here
we're both saying the same thing, if someone does a turbo conversion they might not fit a Dv, 99% will tho but it's not an essential for a petrol turbo
But what i want to know is, if a petrol turbo doesnt have a d/v, what downsides are there?
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
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try reading this thread then ask again
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MattyB
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Registered: 13th Nov 01
Location: 118.5bhp :D
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Yes, like i've said already, "it will totally shag the turbo if a petrol turbo didnt have a d/v".
Please could you explain why? is it coz of what i said it might be (turbo stall etc)
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M4rk P
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Registered: 22nd Jan 03
Location: Herts, Car:1.5tds
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quote:
Originally posted by Adam
who needs a dv anyway when you have the ptish over overboost from the safety valve
i dont have a overboost valve on my td, cant find it anywhere. its not on the manifold like kris's?? 
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Tam the diesel man
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Registered: 31st Jul 01
Location: Portsmouth
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might be on the back mate (where the fuel pump is) seen a few engines with the valve there
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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
quote:
Originally posted by Kris TD
erm, the air get used to combust the fuel.
So what your saying is, even without a D/V, the boost would all be released.
I know that with my D/V turned off, boost levels drop pretty rapidly anyway. So - Basically whether i have a dump valve or not, you are saying that the engine will release boost, there fore increasing lag.
Some people are also saying that ALL turbo petrols have a Dump valve as standard OR need one, but they cant explain why???
sorry but i really dont have a clue what you are asking.
the air will combust with the fuel in the engine, it doesnt just dissappear. the reason it stops boosting is because there is not as much fuel pumped into the engine, hence less air is combusted, hence less exhaust gas, hence the turbo doesnt spool.
dump valves on petrols are there to prolong turbo life and reduce stalling of the turbo.
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Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
User status: Offline
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quote:
Originally posted by Tam the diesel man
might be on the back mate (where the fuel pump is) seen a few engines with the valve there
nah, its not got one full stop.
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