I just got an email from a dutch based company who explained a bit about a variable turbocharger so i was like what?!

Basicly the have and extra valve in the ex. housing that with lower rpms/boost is almost closed so there is more pressure on it and when further on the throttle it opens!

somehow it does sounds dodgy but i reckon it has a point as well!


here is the pic they sent it with!




what do u think ?

 

if we mean variable vein turbos then been done for years mate, mainly on diesels.

theres a reason its not used on petrols, reliability reasons, probably to do with heat, not sure

if you mean summat else, fuck knows

 

its called a wastegate you spoon

 

no u numbnuts! i know what a fookin wastegate does!

 

ah so now you add a pic to make me look stupid

 

it is ? hmmm didnt know that !

but i diesel is out of puff quickly anyway

 

 

They do it on diesels rene so they can use a bigger ex housing and still have no lag, so they dont run out of puff so easy top end.

Itd be good on a petrol if it works properly, but theres an issue with VVTs that stop that happening, dont remember why, but there is, hence why we not all using them

 

aaah ok steve thanks!

anybody knows for sure why we aint using them ?

 

Variable vane has been around ages as Steve said. Petrol engines run too hot for them though but IIRC I think there are a few cars appearing with this technology. Might be bollox though.

 

Geoff Kershaws ballistic missile 24v 3dr Sprint car uses 2 of these , he runs Turbo technics for those who didn't know . I will be talking to Giles about one maybe for next year once i understand a bit more about them as im just as in the dark as all you experts .

 

we use VNT on our petrol engines !! , very effective i suppose , would like to see it on a very h igh performance engine tho !!

 

I had a magazine feature on his car but ive lost it

But yea was gonna say that 24v twin turbo thing used 2 of em.

Meant to be 600bhp or summat wasnt it?

 

im sure the pug 205 t16 had it
but like said,,, they had to change turbos,,, alot

theres loads of derv on the road with it,, sprinter vans being one

 

It does Fookin go ... Seen him Sprint a few times , well built car and a quality Driver too , shown an interest in Racing with us next year from what i was told . 4wd tho' with some interesting ideas and tiny wheels !

 

Variable Geometry turbochargers - been around for a few of years now - when i worked for Holset Engineering in huddersfield (they make turbochargers and turbochargers only ) i was involved with the construction of the VG assembly line (was a lectrical engineer there for 2 years) and it was some mean feat - them VG units went thru years and years of design and testing - used to love watching the test booths - they tested turbocharges to destruction on self contained units in sealed booths and also had engine test beds with dyno's on each bed - they were fantastic - 40% overfueling on an 14 litre cummins straight 6 - was pushing out over 700 horse power at 2600rpm . was asked to watch a test bed with a DAF engine on - tested that to destruction - snapped the crank in half and sent bits of engine all over that was fantastic

 

i reckon i need another job!

sounds fookin cool

 

http://www.holset.co.uk/files/2_5_1_...20geometry.php

explains the principles and fundimentals of a Variable Geometry turbo

 

http://www.holset.co.uk/pics-related...eometry/VG.swf

this even