Vxr8

[Mike]

Are they actually on sale now??

I saw one in Caerphilly South Wales yesterday night, with a Dudley registration (DY)

[Jack]

Since July '07 iirc...

Doesn't have VTEC though, so I'm not interested. Yo.

[Philsutton]

Since July '07 iirc...

Doesn't have VTEC though, so I'm not interested. Yo.

thats bad marketing, they'll never sell any with that attitude

[novacabrio]

Been on sale ages, I can supply one if your buying, only about 8 dealers in the country lol

[Saloony]

Yep, my mate has one with the exhuast upgrade, the only car that when it took off up the road it gave me goosebumps just from the noise, i shall be having a roadtest soon..

[Mike]

^ TBH the one i saw did sound quite nice :D also saw/heard a load of Astra CDTi things, didnt realise they have dump valves as standard?

[novacabrio]

^ TBH the one i saw did sound quite nice :D also saw/heard a load of Astra CDTi things, didnt realise they have dump valves as standard?

they dont?

[Saloony]

If anything the turbos spool up is seriously loud on them things.

[Jack]

I didn't think a dump valve works on a diesel, as they don't have a throttle so there's nothing for the air to hit?

Well, you can fit an electronically controlled one, but its a bit pointless lol

[draper]

i thought diesal turbos worked at lower pressure so a normal dump valve doesnt work, you can get diesal spefic ones tho

[Mike]

they dont?

I was outside our B&B (been working away) smoking and saw loads of them, you could hear ever so quitely a D/V noise. The Merc Van ive been driving has got one too, thats a 114CDi thingy

[Jack]

Dervs work at higher pressure than petrol engines, thats how combustion takes place inside the engine.

On a petrol engine, when the throttle closes, there is still exhaust gas passing over the turbo so its still generating pressure - this compressed air hits the closed throttle and bounces back to the fan blades and makes the turbo stall (bad). A DV is opened when the throttle shuts (due to vacuum on the inlet side) and allows the air to vent elsewhere, be it back to the air box or to atmosphere.

As a derv engine has no throttle, it doesn't have the capability for this, so needs to have an electrical way of controlling a DV

[Mike]

^ what i did notice with our Merc Van, the DV makes it noise when you press the throttle, it hisses then you go lol

[mowgli]

^ what i did notice with our Merc Van, the DV makes it noise when you press the throttle, it hisses then you go lol

I thought the merc td had a variable aperture inlet tract to alter the torque...


Please clear this up for me. is a dv a device to deliberately lose boost thus lower the power which in turn stops the wheels spinning on escort cossies etc in forests?

[Stuart]

the EGR valves on most TD's "act" like a dump valve to bin off some air on lift off, but generally the VNT/VGT (thats variable Nozzle Turbo/variable geometry turbo) controls overrun boost and it can make a dumping kind of noise.

those damn merc engines are horribly noisy ewwww

[Lee]

Only on PNG can a thread about a VXR8 turn into an in-depth discussion on diesels before it even makes it out of the first page lol

[Mike]

those damn merc engines are horribly noisy ewwww

Yea, TBH it is a bit noisy, but it has got 104+ thousand miles on it lol it does make some wickedy bo noises tho lol and it gots the bestest handbrake evar! Its a fecking handbrake PEDAL!

[Jack]

Please clear this up for me. is a dv a device to deliberately lose boost thus lower the power which in turn stops the wheels spinning on escort cossies etc in forests?
No, it stops the turbo from stalling on closed throttle.

[Timmy]

why bother run aint lag baby !!!!

[Stuart]

a DV is infinately cheaper to use correctly than anti lag is...

you need a special spec turbo, which still needs rebulding every 5 mins for anti slag lol.

[Dar]

I wouldn't bother with any of that, just rip out the engine and fit a VTec Yo!!

As for the diesels run at low pressure/high pressure thing. They have a much higher compression ratio, anything from 14:1 to 25:1 but the turbos run lower pressure (I think).