Dump valve open
Turbo Mini Forums

With engine running at idle, is the dump valve supposed to be open? cos it is!

Sooperdooperturbocooperexpertengineering!

they do tend to be slightly open, blip the throttle and it should close.

At idle you have a vacuum on the inlet manifold side (pulling it open) and no positive pressure on the other side of the butterfly so in theory it should be open.

(if my brain is in gear!)

thing is, at part throttle at cruise, there likely to be some vac there isnt there? will it matter? or do i need a stronger spring?

Sooperdooperturbocooperexpertengineering!

it should be fine

I wouldnt worry too much.

I'd say you need to worry...

Sounding like a bus in not good

alex

AlexF

Nothing wrong with sounding like a bus!

get a blow off valve instead, i am getting one off ebay! end up sounding like a soddin jet or summat, proper high pitched dump!

Shirley that are one and the same?

Sooperdooperturbocooperexpertengineering!

Yep. They often call them BOV's now and then charge lots more money as it makes a different sound! lol!

Ive just got a forge grp A one i picked up brand new for ?50. Ebay Bargain!

i got a forge competition one (FMDV002) too

http://www.forgemotorsport.co.uk/products....product=FMDV002

for ?44 on ebay! brand new!

Sooperdooperturbocooperexpertengineering!

dumpers, dvs, sump valves, bovs, all the same shit!

alex

AlexF

a Sump valve eh?.... is that to blow out excess oil?

Sooperdooperturbocooperexpertengineering!

my mini has 1 of em...

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

yup :p

AlexF

ive also got that one from ebayh, with new diaphram 22.50 hahaha i win

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3

Mines better tho... ner ner!

Sooperdooperturbocooperexpertengineering!

this one is very similar to mine, came with a full fitting kit too, bloke said it cost him ?150!! can believe it now looking at those prices!!!

Mine was brand new too.

[link]http://www.forgemotorsport.co.uk/products.asp?cat=TUNDV&product=FMDVEV014[/link]

I had a diapraghm one then went with these which are sort of half and half. Worked loads better. its nearly the same as my le mans grp A one i had, that sounded really good.

Not bus like at all as it was really crisp.

Took it out last night.... its quite quick!!

but the dump valve is sucking (quite loudly) untill you put the gas on.... especially coasting up to jumctions...

anyone else experience this?

Sooperdooperturbocooperexpertengineering!

iv often wondered about this, as its un-filtered air getin into the engine. i meen you coast down to lights engine sees vacuum opens DV, and its easier to sook air in there than thro turbo and air filter...

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

evolotion I have wondered on this as well
It strikes me that it would get air through , making idle LEAN ...
lets see what the pros say :)

TurboLessTosser

it wont make idle lean, as its intaking on the fresh air side of the carb. the air will just go in through the DV intead of the turbo... ie unfiltered!

its just the noise thats concerning me!

Sooperdooperturbocooperexpertengineering!

Forge do one with a filter built in
for rally stuff where there's loads of dust etc about

I went out tonite in mine, it seems to be staying open, well, as soon as i get to like 3000revs it opens up! Yes i sound like a coach! Thats only when its under load though, like going up hill.

On downhill, or stationary revving it its fine and opens only on high revs.

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3

it should close more when it comes on boost! as the pressure forces it shut. You sure you've got it all connected right?

Feebs thats not rite! it should open when manifiold is under VACUUM (ie when at idle or low throttle openings.) once under throttle, it should close!

Sooperdooperturbocooperexpertengineering!