dump valve,bov - Page 2

t4 tony · Mar 13th, 2008, 17:15

Quote:

Originally Posted by t4 tony

now then,put my dump valve on yesterday (its a forge one) and it's very quiet??? dose it need to work in a bit or something???or could a small air leak be the cause?i thought maybe some thing was'nt tight enough or there was air git out elsewere?i'm sure i've tightend everything up right though can any shed some light?

ok been for a blast today and the valve dumps off nicely to 5000rpm but after that nothing???any ideas anyone???

t4 tony · Mar 13th, 2008, 17:22

p.s.the dump valve is in the intercooler to throtle body pipe

Enigma666 · Mar 13th, 2008, 19:04

Above that one a standard map you're losing boost pressure which would explain the lesser dump noise....need to find our perfect shift time to get max woosh value

t4 tony · Mar 13th, 2008, 19:15

what do you mean enigma666 i didnt under stand that am i losing boost then

Enigma666 · Mar 13th, 2008, 19:26

Ok, the car makes max power on the curve
Max Power (bhp/rpm) 200/5500 apparently
But in certain gears (especially lower ones) that boost pressure tails off pretty quickly so there is less boost pressure to release to sound the valve...does that make sense?

t4 tony · Mar 13th, 2008, 21:09

yeh man now i understand,lol. i'm a biker really,these turbo cars are new to me i've only had a car license a year!

wa666ou · Mar 13th, 2008, 23:55

And for different boost pressure (0,6 vs 1,6 bar) there are different springs available (for the Forge).
Too hard spring on low pressure turbo means that BOV won't open much or at all.
Softer spring means that valve opens too early.
In most BOV's you can adjust the spring hardness with the screw.

And it's interesting that some people have tested many BOV's and none of them work. Twin piston or not, no difference. Car just stalls every time.
And why doesn't it work... I don't know.

t4 tony · Mar 14th, 2008, 11:05

Quote:

Originally Posted by t4 tony

now then,put my dump valve on yesterday (its a forge one) and it's very quiet??? dose it need to work in a bit or something???or could a small air leak be the cause?i thought maybe some thing was'nt tight enough or there was air git out elsewere?i'm sure i've tightend everything up right though can any shed some light?

alright boy'os i've fixed it...it was the vaccume pipe on the top off the valve were the problem was,it was getting folded over when i shut the bonnet!!!doh.any way it's dumpin like a winner now i love it

Enigma666 · Mar 14th, 2008, 11:06

Congrats mate....any ill side effect at all?

callyuk · Mar 14th, 2008, 11:14

i wonder if im having a simalar problem to that with mine on my 850 t5 iv always just put it down to being a quiet valve

Mar 14th, 2008, 11:14	#20
callyuk Premier Member Last Online: Mar 26th, 2011 14:40 Join Date: Nov 2006 Location: aberdare View Photos By: callyuk	i wonder if im having a simalar problem to that with mine on my 850 t5 iv always just put it down to being a quiet valve __________________ http://corlesscustoms.uk.nu/index.php

Mar 13th, 2008, 17:22	#12
t4 tony Master Member Last Online: Nov 1st, 2016 19:57 Join Date: Mar 2008 Location: up north View Photos By: t4 tony	p.s.the dump valve is in the intercooler to throtle body pipe

Mar 13th, 2008, 19:04	#13
Enigma666 Master Member Last Online: Apr 16th, 2021 11:32 Join Date: Aug 2006 Location: Chester	Above that one a standard map you're losing boost pressure which would explain the lesser dump noise....need to find our perfect shift time to get max woosh value

Mar 13th, 2008, 19:15	#14
t4 tony Master Member Last Online: Nov 1st, 2016 19:57 Join Date: Mar 2008 Location: up north View Photos By: t4 tony	what do you mean enigma666 i didnt under stand that am i losing boost then

Mar 13th, 2008, 19:26	#15
Enigma666 Master Member Last Online: Apr 16th, 2021 11:32 Join Date: Aug 2006 Location: Chester	Ok, the car makes max power on the curve Max Power (bhp/rpm) 200/5500 apparently But in certain gears (especially lower ones) that boost pressure tails off pretty quickly so there is less boost pressure to release to sound the valve...does that make sense?

Mar 13th, 2008, 21:09	#16
t4 tony Master Member Last Online: Nov 1st, 2016 19:57 Join Date: Mar 2008 Location: up north View Photos By: t4 tony	yeh man now i understand,lol. i'm a biker really,these turbo cars are new to me i've only had a car license a year!

Mar 13th, 2008, 23:55	#17
wa666ou Junior Member Last Online: Jan 26th, 2016 08:34 Join Date: Jun 2006 Location: Kermarne	And for different boost pressure (0,6 vs 1,6 bar) there are different springs available (for the Forge). Too hard spring on low pressure turbo means that BOV won't open much or at all. Softer spring means that valve opens too early. In most BOV's you can adjust the spring hardness with the screw. And it's interesting that some people have tested many BOV's and none of them work. Twin piston or not, no difference. Car just stalls every time. And why doesn't it work... I don't know.

Mar 14th, 2008, 11:06	#19
Enigma666 Master Member Last Online: Apr 16th, 2021 11:32 Join Date: Aug 2006 Location: Chester	Congrats mate....any ill side effect at all?

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