Dump valve YES or NO?????

[2barGee]

I have got a rev 2 with a ct27 turbo running 1.2 bar. i currently have a aftermarket dump valve fitted. would i be able to run without 1 at all?? Or would this cause damage2 the turbo??

I cannot use the standard one as i have bootmounted intercooler so the pipein is different!

Thanks dan

[Mark Edwards]

If you have a ct27 and a boot mount i/c then you should really already have or be considering an after market ecu in which case having a vent to atmosphere bov isn't an issue.

[J3OOSST]

I was lead to understand that once you started to exced 300BHP a dump valve was pretty irrelivant in use, not sure that was technically correct or not...

[Mark Edwards]

I was lead to understand that once you started to exced 300BHP a dump valve was pretty irrelivant in use, not sure that was technically correct or not...

Rubbish i would say.

[TBDevelopments]

yeah i've never heard anything like that either. I know for certain plenty of people on here over 300bhp are running bov's.

Isn't a boot mount a bit overkill for a ct27?

Tim
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[karammander]

definatly rubbish, many high performance cars dont use dump valves like the wrc cars. but there cars are only built to last a couple of stages not thousands of miles. to keep you turbo in the best condition i would use a valve, jus my personal opinion i would recirculate the valve so you dont waste any air needed.

cheers karam

[Mark Edwards]

Isn't a boot mount a bit overkill for a ct27?

Very much so really yes.

[TBDevelopments]

this is still a wierd situation, i've got a BB turbo and been running for over a year now with no bov and its still running perfectly.

Wierd how alot of japanese demo car's don't run them either.

I think the damaging effects are massivly over exagerated. Garrett themselfs said a bov was best but wasn't like the turbo was going to self destruct if one wasn't used.

Have to rememeber WRC cars run something stupid like 2.6 bar boost.

Tim
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[skinthespin]

WRC cars are also rebuilt pretty regular, like Karammander said, infact I thought not using w=one was such adaft idea I called my friend at a WRC team (he is an engine engineer) and asked, he basically said why would a manufacturer waste money putting something on that wasnt necessary, especially when manufacturers are trying to save every penny on every component on a vehicle, it will prolong the life of the turbo and reduce turbo stall, it makes not much difference on a WRC car because the amount of anti lag means the turbo is spooled up all the time anyway.

So basically, unless you are willing to change the turbo more often, and are happy to suffer potential turbo stall then take it off.

[TBDevelopments]

this is what i mean.............

Your mate says one thing.

Garrett one of the worlds biggest turbo manufacture say something else.

I'm still mixed minds, so i don't recommend anything. If it messes up on my car then its my fault and my cost to fix it.

Tim
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[skinthespin]

Eh? Read it again Tim....

Garrett themselfs said a bov was best but wasn't like the turbo was going to self destruct if one wasn't used

Garret know what there on about, and so does my friend, and thats what he said, its best with one on a road car, and WRC cars dont use them cos they get there turbos replaced everyday and they run anti-lag.

[TBDevelopments]

sorry been a long day.

Just never understood why this big japanese tuning companies don't run BOV's? nice and simple to install so never not bother.

Tim
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[skinthespin]

No worries.

Im just assuming they run anti-lag and or/accept they will be changing them often, much like WRC cars, plus the assosiation with top flight motorsport is always a welcome one.

[aaronjb]

Don't forget there is another benefit to a recirc valve that people often forget about (and, IMHO is probably a large part of the reason that factory cars have them):

It makes the turbo silent when you lift off the throttle..

Lets face it, Joe Bloggs doesn't want his flash new motor going 'boing wibble' every time he gets off the gas... (we do, but we're not the average car buyer)

[TBDevelopments]

i can understand replacement with anitlag as thats not good for the turbo anyway.

But some of the jap cars like supras and skylines not running that system and they don't run bov's always wandered why,

Oh well see how long mine lasts. Plus i like the sound better, lol

Tim
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[skinthespin]

Thats a good point by aaron too to be fair, we are always trying to cut down noise to pass legislation, to the point now where we are trying to make the actual engine noise as low as possible so we can make the exhaust even louder!

[Mark Edwards]

Thats a good point by aaron too to be fair, we are always trying to cut down noise to pass legislation, to the point now where we are trying to make the actual engine noise as low as possible so we can make the exhaust even louder!

I've got more noise everywhere.

[TBDevelopments]

wait until you get a screamer pipe on there mate. now those are just taking the p1$$.

Tim
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[george]

what a screamer pipe is?? I heard it before but I dont know what it is..

[TBDevelopments]

its when you have an external wastegate.

A wastegate is a device which opens a small hole up in the manifold to allow exhaust gases to bypass the turbo thus controlling the amount of energy it recieves and doing this you can control boost.

On Most cars where the wastegate opens and bypasses the exhaust gases around the turbo just rejoins the exhaust system after the turbo keeping this process quiet.

A screamer pipe is when the gases are just vented to the air instead of back into the exhaust. When this opens its like having a 40mm hole in the manifold at full throttle. The car raws or screams as when compaired to back to exhaust systems which are quiet.

This is why when its vented to atmosphere its called a screamer pipe

Tim
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