dump valves or not to dump

paulsgarden · Post by **paulsgarden** » Sat May 26, 2007 8:06 pm

hi there all can any one tell me if fitting a dump valve is a worth while practice and if so what sort would be a good choice? thank you all in advance
Paulsgarden

98kellrs · Post by **98kellrs** » Sat May 26, 2007 8:45 pm

As i understand it dump valves on our size turbo do bugger all as they spool up fairly rapidly anyway. I'm under the impression that dump valves are best used on larger turbos to reduce turbo lag, however I'm no expert by any means.

clubman_dan · Post by **clubman_dan** » Sat May 26, 2007 10:00 pm

Welcome to the forum!

there is already a dump valve fitted as standard on the car, if you mean an atmospheric one that makes more noise, i am not sure how well they work on the 480 because of the maf. however someone who has tried it may be able to say otherwise..
from what i understand, the standard bosch dump valve is more than man enough to handle boost up to quite a high level, and its suposed to be there so no problems trying to bodge things to make them work.

paulsgarden · Post by **paulsgarden** » Sun May 27, 2007 7:17 am

well thank you all that has put that idea to rest. looks like it will be a remap to get that exstra

any recomendations. its a 1994 480 turbo in red and good nick.

robkendall · Post by **robkendall** » Sun May 27, 2007 7:28 am

loads of threads about the pros and cons of re-circ (standard DV on 480) versus the BOV type atmospheric DV......fitting wise, is easy, straight swap pretty much.

some people say theyve seen a little difference for the worse, some say not much change.....its one of those suck it and see things.....try one, if it feels good still, then youre probably ok....if not, swap back and sell the atmosdv.

bailey dvs seem to be a pretty good choice....
rgrds
rob

crispy-d · Post by **crispy-d** » Sun May 27, 2007 12:42 pm

Hello there,

Best bet is to replace the standard Bosch recirc. valve with the one that goes in the Audi TTs. I went to the local (well, within 10 miles) Audi dealer and picked one up for under Ã‚Â£24 - it's a direct swap and is exactly the same apart from having brass internals and being able to withstand much higher pressure. Forgotten what the part number is, it's on the forum somewhere, but it ends in 710N.
It actually DOES make a difference, is much smoother and more responsive, and obviously holds boost far better than the standard one. Of course mine was shredded when I replaced it, so of course it was going to be better than that!

Crispin

rpruen · Post by **rpruen** » Sun May 27, 2007 4:11 pm

I would have to say stick with a recirc type.

The audi upgrade type is better built, and will take more boost as mentioned above.

Having tried both, there is no change when replacing a working standard part with the Audi one. The only time it will improve things is if your standard recirc is not working properly.

Richard

ozturbo · Post by **ozturbo** » Tue Jun 05, 2007 7:36 am

It is beyond me why people want those noisy ones on their cars. As my 14 year old son says, it makes the car sound like it is sneezing.

paulsgarden · Post by **paulsgarden** » Tue Jun 05, 2007 7:20 pm

lol ooo yes he do have a good point