Dump valves on Diesels?
Turbo Mini Forums

Hey.

This is a little off topic, but considering you lot know what your on about when it comes to force induction, thought it was the best place to ask...

I've recently got a Vauxhall Astra 2litre turbo Diesel S reg, I was wondering, is it worth fitting a dumpo valve, and maybe an intercooler? I am unsure if it has one atm... also is it worth it?

Sorry for being offtopic, but I wanna put my thoughts to rest lol

ta

Definitely worth fitting an intercooler, it has the same effect on diesel and petrol. However, a dump valve works on the shutting of butterfly and seeing a vacuum. There is no butterfly on a diesel so it won't work or give any benefit, as far as I understand it.

Edited by Ben H on 18th Apr, 2008.

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Intercooler is worth it however it won't go any faster unless you sort the fuelling at the same time.

Dump valve on a diesel is an absolute 100% waste of time and effort.

just to let you know it has both... i had one of these as a loan car it has a recurculating dumpvalve and an intercooler :) New shape

sorry didnt see it was an S reg i thought they had intercooler as it was only small ones hidden away?

Edited by Paul R on 18th Apr, 2008.

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

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A friend of mine who is a bit daft fitted a dump valve to his Nova TD. It wasnt pipe into the engine in anyway tho. Something to do with rigging it to the brake servo. Just to achieve the psssst.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


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I wasn't after one for the noise, I wanted to fit one for the benifit, but as it seems, it would be a waste of time.

I'll investigate about an intercooler... Tom, how would I go about fettling with fueling?

I think they have intercoolers as standard iirc. You will be able to get more power by winding up the boost and sorting the fuelling. Do a load of reading on it, tuning diesel turbos is totally different from tuning petrols.

As for dump valve, ben is absolutely right. No butterfly so no vac and no point. I think derv doctor sell a kit with a solonoid to release the pressure. I've heard them before, they sound awful.

they have an intercooler. infront on the rad on the n/s or left hand depending if your being all EU about things .

best thing for a diesel is get a decent cooler on it and abit more boost and then get it properly remapped by a diesel tuning place. stupid benifits to be had just from remapping a wiesel!

if its an izuzu engine you can get loads of power from them, such on mig web, something todo with twiddling a few simple things and changing the intercooler

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

AlexF

recurculating dumpvalve, looked like the old ford mondeo plastic ones not an egr

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

i am a little confused now, if its a 2 litre then its not the isuzu one i dont think, i have turned an astra and a nova isuzu td of my own up and the gains are simply amazing (the difference, not the actual performance, lol) i have also done a 205td with verry good results but they were all mechanicle pumps and i think that on an S plate yours will be ECU... go buy an isuzu one:) hehe

The 1,7 is Isuzu. Dump valve on diesels

Ok thanks for all the info fellas, I knew you'd lot know :)

If my Astra does have an intercooler, would it be worth upgrading it to a better one?

Also, mainly to the people that have fiddled with TD enignes... you talk about benifits, such as?

More MPG? More power & MPG?
Just curious :)