Outer Limits 4x4 Board

AnthonyP wrote:So my final word of advice is BY A HICLONE THERE SO MUCH BETTER

note: the above reference to by a hiclone is purely intended as bullshit

God for a week for that one LMAO!!!!

ToNkA wrote::roll: http://www.sunamiturbo.com/

Surely thats a joke.......Please tell me thats a joke

P.S does anyone know where I can get some "Duff Duff" music for my Woofer
OOH OOH and some Nissmo/Trd stickers

Dont forget those long purple flashin bling bling undercariage rock lights
In the event of a rollover just crank the tunes and have a rave PARTAY

*NOTE:- BEFORE PEOPLE FLAME ME OR ATTEMPT TO MAKE A SMART ARSE COMMENT ON WHAT I'VE SAID, THIS POST HAS TO DO WITH PERFORMANCE PETROL MOTORS, NOT DIESELS*

A BOV actually does have a purpose other than the sound produced. When the throttle body is shut, where does all the excess pressure/air volume go if you DONT have a BOV?? Straight back into the compressor wheel of the turbo....not good. Why?? Cos the turbo is still spinning at high speed, so effectively you are pushing air back into the comp. wheel blades in the opposite direction to what the comp. wheel is compressing air. In high boost situations, this has disastrous effects on the comp wheel, being known to snap the shaft IN HALF with no BOV fitted.

External wastegate = used in high boost motors. For anything under say 18psi, and internal gate is fine, BUT, this also depends on the size of the turbo.

Phill

Was pretty clear that the thread was how to fit a BOV to a diesel.

CHEEZ wrote:does anyone know how to put a bov on a diesle engine??

looks clear its for a diesel engine to me

Ahh shit!! I made an arse of myself....Ozzie Day beers, who can blame me?!

My POST edited now

Phill

Thought I read somewhere that the 4.2 turbo diesel nissans have blow off valves and that theres problems with them leaking.
Also from memory, Mike Vine turbochargers in Capalaba runs blow off valves on his turbo kits for diesels.






And








What about volvo trucks and buses


They make a sound like a blow off valve when they change gear.

If you want a good sound run a 2 or 3" exhaust system with no muffler! sounds great and makes the turbo whistle LOUD

rocknferoza wrote:Thought I read somewhere that the 4.2 turbo diesel nissans have blow off valves and that theres problems with them leaking.
Also from memory, Mike Vine turbochargers in Capalaba runs blow off valves on his turbo kits for diesels.






And








What about volvo trucks and buses


They make a sound like a blow off valve when they change gear.

They don't run blow off valve's they run pop off valves and what there designed to do is nothing! nah they just sit there untill the engine may have a problem where there is way too much boost produced so the pop off valve is a valve with a preloaded spring and it's designed to release the air in the manafold if it reaches an too exessive amount, and that's why you can't run high boost in a car fitted with these untill there removed EG: VL Turbo Commodore

DR Frankenstine wrote:If you want a good sound run a 2 or 3" exhaust system with no muffler! sounds great and makes the turbo whistle LOUD

A mate of mine has got a turbo diesel disco with the john davies turbo upgrade kit and now hes removed the mufflers and is running the standard 2 inch exhaust straight through
Sounds awsome, you can hear the turbo at idle and it sounds like the comp trucks

a bov and popoff valve are the same thing....just a bov is adjustable to suit higher pressure!!!!

Happy to help if anyone wants to fit subs in their rockcrawler...
been there done that for many years

Putting a blow off valve on diesel is a lot of stuffing around...BOV's need vacume to opperate and a diesel dosent have enough vacume to opperate one...I have seen one set up electricly to opperate of the vacume of the alternater with set stage switchs on the clutch..it worked well released presure off the turbo and gained boost real fast..was very inpressed. but what a pain in the ass to do...




Bretto

mud4b wrote:a bov and popoff valve are the same thing....just a bov is adjustable to suit higher pressure!!!!

My understanding has allways been that a Pop off valve as fitted to most Turbo Nissans is for when boost excedes the recomended PSI. VLs will pop around 8-10PSI usually. These let go while under boost.

A blow off valve(Vacume controlled not electric) on the other hand releases stored Boost presure from behind the throttle butterfly when engine vacume builds up. So when you back off and shut the throttle butterfly the engine gets Vacume again rather than boost and it opens the Blow off valve to stop the boost presure becoming too high on the supply side of the throttle butterfly and therfore not slowing the turbo down and allowing it to remain at a higher level of boost and minimise lag between gear changes.

For example a VL turbo Manual with 15psi boost will loose maybe 5-10psi in a gear change without a BOV where as with a BOV fitted it will usually only loose 2-5PSI.

dats Fully Sik Man

straight through pipes sound way better. and get an engine brake. they sound cool too.

if ya want the *KSSSSSSSH* sound get a compressor.