ok we all know that dump valves are just one of many things that cause you to be regarded as homosexual in passionford land (along with water injection, decompression plates and anything that doesnt say GRS on it ) but im sure the members of this board are not so shallow minded as to follow the crowd.......

so dv's yay or nay? it seems universally accepted that there's no real performance benefit, though i have heard things said about them being "carb friendly" but not sure why....

Of course the big thing is the noise. I like the turbo chatter (rolls' sounds mint!) but mine sounds a bit for some reason - it's loud, but sounds like a flock of doves!! Just got myself a cheap nearly new grpA DV to replace the old bailey piston.........anf i gotta say, as roy bacer as it may be it sounds mint lol

so who uses one?

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nup, nup and nup.... I did have one but took it off at Brunters and noticed a big difference performance wise. The car was actually less laggy without it. Noise wise was better without it as well cause the chatter was mean!!!! By all means try it, but am 99% sure you'll take it off!!

Chris

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I had a Grp A Renault 5 one on my carb'd XRT setup, when I took it off it was noticeably better, and a bit more stealthy on the road. I got fed up off tw*ts always looking when you drove off from the lights.

I'd personally say no, but it's down to different tastes I guess, and if you want people to know you obviously have a turbo lump under the bonnet.

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Kam
1982 E21 323i EFi Turbo

but thats just it, mines not mean, its gay! Rolls' sounds vicious (as yours probably did) and so does my mates GTT (and thats a T25 too!). Quite funny at ford fair, I'd just arrived and was busy cleaning, heard a mahoooosive chatter and thought "i bet thats rolls", looked up and behold a silver XR2 rolling in lol




I been running one since i turbo'd it, with short spells without. tbh yeah it is "slightly" more laggy with it on - though this new diaphragm one also seems to shut earlier than the bailey piston type did so there'll be less time spent pouring air out on spool up!

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I guess it's down to personal preference and what you want. The chatter from mine isn't a lot, but it's enough for anyone who hears it to know theres a turbo under the bonnet. That's fine for me, the less people know about my car the better, especially the criminal element if you know what i mean!

I guess the other thing might be to upgrade to a T3 for some extra loud chatter?

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Kam
1982 E21 323i EFi Turbo

I did have one but took it off and sold it!

Its just for little boys who want their car to make a noise!

Dave.

whooop whooop!!! bring it on ptschhhhhhhhhhhhhhhh

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not necessarily. On me MR2 its the absolute nuts and works very well. It only works well on certain cars....

You need to adjust what you said I think!

Chris

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yeah Chris. the thing is on the ERST engine they CAUSE problems (crazy metering unit strikes again!), so having one is really pretty pointless as your making trouble for the sake of the noise.

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aiiii!!!!

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The jap ones like chris has on his mr2 sound mint...the typical pttttsssccchhhh is not my cup of tea...actually detrimental to performance unless you run a T4 upward and then I think you might need one to shop the blades shattering...gimmicky...give me the chatter any day!

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Guess what im gona reply guys????
As chris and dave both say, i think that the jap ones sound pretty bloody kool, but i wouldnt have one one my car.

As you say, the chatter on mine is ok, esp for 6psi, i cant wait till i can afford to get the car setup on 12 to see what it sounds like then. Thing is that my car drives so much nicer without one on- no drop off in boost, no time needed for the turbo to spool back up again etc..... Will only have one on a turbied car if it needs it, on a t4 with big boost for exapmle!!!!!

Think it also helps on mine that the airfilter is about 4 cm form the actual turbo- you can even make it chatter on the spot, which is kool!!!!!!! I think that t3 helps things too, it was never that lond with the t2 on, and that was running double the boost level!!!

cheers rolls

I've got a forge group A for the mk1, with a kevlar diaphragm. I'm gonna run it but shim/spring it right up...sounds wicked cos you get the very short, sharp "ptshh" then chatter, as the spring is so hard that it only opens momentarily, and once the initial pressure is released the vacume isnt enough to overcome the spring.

And at low engine speeds you dont get it opening at all which i like...nothing worse than seeing barry and his best mate kev rolling down broad street at about 5mph with a big "tssshhhhhhhhhh" every time they back off for a speed bump in thier standard -200mm chopped springed rusty erst.

So i say keep it, just stick either a big shim in, or a harder spring.

-Paul

pmsl at this smillie- didnt notice it before lol!!!!!!!!!!

rolls

Personally I would say no, most people look as they think its a bus and then laugh, or they notice the car and your more likely to get it nicked as its something special to see an xr2 with a turbo, and they arent exactly hard to nick.

I think the rally style ones sound good though, the whistle ones, not sure what the difference is, but they must be good.

I wont put one on the escort, I dont want to draw attention to the fact it has a turbo, just want to keep it looking as is but have a bit of go.

if you like it - keep it, if you dont like it - dont keep it! simple!

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i gotta agree about the rally ones, i think they sounds gorgeous. last time i drove a11 i had just fitted a new baileys twin piston dv. i gotta admit, each time it went off i couldent surpress the biggest grin! i totally love it. i may change my mind once the novelty has worn off. might try putting a harder spring in at some point but at the moment i think its spot on!

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Iv gotta defo have a Dump valve when i get me Turbo Engine,
Spose its because iv never had a turbo before.

ive had cheapo one, a bailey's and the only one i liked is my gpA cossie diaphram one, wiv a kevlar h/d diaphram. i never noticed any more lag with it on, but it has a h/d spring.
on low boost it never used to chatter wiv out a d/v, but on hi it would.
keep it, it might not do any thing on perf, but help prolong your turbo.

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2007 Yamaha R1 Race bike


Fiecos 11.1@124mph, 0-60 in 3.04, 0-100 in 6.88.. Xr2tt 13.6@100mph,

I was under the impresson that on the Escort and Fiesta RS Turbo engine's they are simply not needed and were generaly detremental to performance. It's only on the big Cosworth lumps that they actualy become useful for what they are designed to do.

Jason.

no, if a t34 or a t4 needs one when there runnin there max boost, then a t25 runnin to its max then the same applies, cos they work just as hard, spin the same sort of speeds.

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2007 Yamaha R1 Race bike


Fiecos 11.1@124mph, 0-60 in 3.04, 0-100 in 6.88.. Xr2tt 13.6@100mph,

id much prefer the sound of loud turbo chatter, but i have to admit, on some engines they do sound the nuts, and like paul said they sound good with a stiffer spring in. and sometimes you can still get a small amount of chatter then theyre like that!

chris LOVES his on A11 - but the guy likes novas, so what can i say

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wanted: Focus RS box. Mk2 MCR arch kit. Motivation.

Well, i think they do sounds pretty good, i'm easily amused. but i LOVE the chatter (i may have mentioned this before!). After hearing ptttish all day long at Ford Fair, it was getting boring, but when Gav from FT.com rolled past in his silver beast, the beautiful sound of the chatter caught my ear, and i was sold!

IMO, stick with the chatter, unless you can't get it, then go for the d/v.

I like the sound of the d/v Paul is on about, best of both worlds! can't be bad.

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Its not really the speed of the turbo that causes the damage.
Its the fact that larger turbos such as the T4 and above have heavier internals, the shaft itself has lot more mass, which casues alot of intertia to build up when running alot of boost. When the throttle closes and the air kicks back against the compressor blades (which causes "chatter") this can cause damage.

I've never heard of anyone actually breaking a turbo, my mate used to run a T4 on his 3 door and he removed his D/V for a while, after about 5 mins death it jammed the turbo shaft completely, luckily he was able to dislodge it and it appeared undamaged, but after he re-fitted the D/V it didnt ever happen again?

-Paul

id say no to a dumpy uless its a bailey ite, the one i have is sh!te

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even tho im drifting @ the E30zone i havent forgoton my Ford roots