BOV on a 2.8 hilux.

[Ash.brown]

Just wondering if it is possible to put a bov on a 3L diesel hilux and does anyone have any diagrams on the setup of one?

[crankycruiser]

pretty sure u cant do it as diesels dont run a butterfly on the intake.. therefore no buildup of pressure when u shut the throttle..

u jsut want it for wank factor i guess?

[Kingston_99]

u jsut want it for wank factor i guess?

+1 wank factor to the max, BOV on a 4wd lamo

[Going_up]

mine sounds like a mack truck when i change gears. blowing back through the turbo... like the "pewwww" sound

i dont have a bov, pod filter or nothing... not sure why it dose it

[cmarico]

Just wondering if it is possible to put a bov on a 3L diesel hilux and does anyone have any diagrams on the setup of one?

Stainless Steel Pipes, Big Truck Intercooler and a Pod filter and it will dose like a vl bro!

[Wambat]

in most setups the bov still harms the intended use. as yes it saves your turbo from damage with the air and all that, but as most vent to atmosphere(cause nobs like that) or back into the exaust, the preasure built up is wasted, if you want it to help the hilux chug along then a waste gate is the better option.

also like the otheres have said piping will get you the noise if thats what you want, but you wont ever gett the same noise out of a diesel they just dont spin as fast. (most of the motors dont really rev past 4500 and eve that would be high, my 75 redlines at 3500 where as your petrol is coming on boost at those rpm it will have a deep loud sound.

my turbo 60 series had the noise an all i did was not run a muffler, and in doing that had less ristriction it spooled faster and preformed better.

[mutilated]

BOVs can not be fitted on diesels as they have no throttle butterfly to trap boost pressure.

[SCANAS]

x2 on the no mufflers...

You can run one but not worth the hassle.

[oldmate]

the 2h as an example have inttake butterflys to control fueling, so at high boost a blowoff valve is required.

As for fitting one to a 3l, there's no reason you can't add one you could just mock up a butterfly to the intake. It won't affect the engine because there's no air/fuel ratio to worry about. However it would have to be a good job to avoid air leaks and such.

[cmarico]

in most setups the bov still harms the intended use. as yes it saves your turbo from damage with the air and all that, but as most vent to atmosphere(cause nobs like that) or back into the exaust, the preasure built up is wasted, if you want it to help the hilux chug along then a waste gate is the better option.

Ummm - your a bit wrong their mate.

Wastegates are designed to control boost by venting excess exhaust out of the system (or back in later in the exhaust). Done so your turbo doesn't keep spooling.

A BOV is designed to vent excess boost that builds up when the throttle butterfly closes, the built up air has no-where to go - and has to rush back through the turbo. Bad for the turbo and also increases lag.

The pressure built up is wasted regardless of whether you fit a BOV or not - as it will either vent out through the BOV or go back through the turbo. At least with a BOV - the vented air won't go back through the turbo forcing the turbine to slow down - hence reducing lag.

[SCANAS]

BOV is not worth doing for performance in a low boost diesel set up.
Valve $200 bucks plus $50 piping... spend it on exhaust!

For sound it is possible but you would be better off putting a mandrel bent 2 1/2" system with no mufflers on the vehickle to get a good whistle.

A free flowing exhaust will keep your turbo shaft spinning freely in between gear changes, increase life of turbo and help reduce lag

Diesel's don't create an intake vaccum so the release is bugger all

Unless you have a fully worked 3l making 20+psi in which case you better start saving for a new engine

[Ash.brown]

OK. well the setup the vehicle has at the minute. is a full 3in bandrel bent exhaust from turbo to just past the tansfer (where the exhaust ends). it runs around the 13psi mark which gets to about 14 at around 4200. it also has a topmount intercooler off a soarer or supra.

[SCANAS]

Up to you then, It is probably the next step if you are already running more boost zaust intercooler etc.

Would be small gain.

You could always change gears at WOT

[tweak'e]

you don't need a butterfly in the intake to make them work.
run them off the vaccum system and electrically triggered, usually with throttle and clutch switchs.
effect is usually small but some of the highly worked motors have found they help a fair bit. it will depend a lot on what turbo etc your running.
i don't think they are worth the cost.

check out surf forum, there is a few guys running BOV on them.

[Wambat]

in most setups the bov still harms the intended use. as yes it saves your turbo from damage with the air and all that, but as most vent to atmosphere(cause nobs like that) or back into the exaust, the preasure built up is wasted, if you want it to help the hilux chug along then a waste gate is the better option.

Ummm - your a bit wrong their mate.

Wastegates are designed to control boost by venting excess exhaust out of the system (or back in later in the exhaust). Done so your turbo doesn't keep spooling.

A BOV is designed to vent excess boost that builds up when the throttle butterfly closes, the built up air has no-where to go - and has to rush back through the turbo. Bad for the turbo and also increases lag.

The pressure built up is wasted regardless of whether you fit a BOV or not - as it will either vent out through the BOV or go back through the turbo. At least with a BOV - the vented air won't go back through the turbo forcing the turbine to slow down - hence reducing lag.

yeah, i understand that, and that is what i have been taught, however, the part i may have wrong i would think then becomes the plumb back type?? which may be where i was confusing wastegates and bovs,

i know it is used to stop your turbo spinning backwards when the butter fly snaps shut(have had to explain that many a time to quite a few people) but the part i thought was the difference, is that some one had told me if you set it up correctly you can use the bov(as i have been corrected) so plumb the exhaust back into the front of the compressor(the exhaust manifold) to help keep the turbo spooled up.

again i could be wrong, and i welcome being taught the right information, as it will help me in getting my lazy ass 2h working better!!!

[Gwagensteve]

The 660cc suzuki cappuccino motor used that system - BOV plumbed back in before the compressor to aid spooling.

I have no idea if the effect is measurable though. In the cappuccino, it was a handy spot to run the piping. On the same motor in a suzuki sierra, suzuki plumb the BOV back into the air filter, or put the whole BOV in the air filter.

PS, diesels then to run on boost a lot more than a petrol. If you were able to set up a BOV on a 3L to acutally work, you'd get sick of the sneezing pretty quick.

the 660cc suzuki motors are also generally on boost all the time, and the sneezing BOV is a massive PITA- especially off road where you are making lots of small throttle adjustments- they're much better plumbed back.

you'd be better playing with plumbing, wastegates etc to get a nice wastegate pop and spool whistle - that's a more appropriate sound for a diesel.


Steve

[Matt_85Lux]

If I understand sorrectly a plumback blow off valve is pumbed into the exhuast manifold to help spool up the turbo? If that is the case the person that told you that doesn't seem to know what they are talking about. If you were to do that, and i'll use a petrol efi motor as an example, then the exhaust will be getting fresh unburnt air which in turn will make the motor appear, to the ecu, to be running lean and it will create extra dramas in the tuning process.

The only real use of a BOV is to vent the excess pressure build up in the intake pipes when the throttlebody shuts which helps lessen lag and prolongs the life of a turbo as a diesel doesn't have a lot of lag anyway due to it not having a butterfly as such and the aslo not drawing a vacuum it ,imo, would be a waste of time to put one on a diesel

[pozman]

plumb back bovs, plumb back the wasted boost pressure pre turbo and post air flow meter/maf, they plumb it back here because the bov lets of metered air if vented to atmosphere, hence making the car run rich between gear changes

if it is plumbed back there is no metered air lost from the intake and the car will run normally, this is also why atmo bovs are illegal

this is for petrols btw

[hilux79]

plumb back bovs, plumb back the wasted boost pressure pre turbo and post air flow meter/maf, they plumb it back here because the bov lets of metered air if vented to atmosphere, hence making the car run rich between gear changes

if it is plumbed back there is no metered air lost from the intake and the car will run normally, this is also why atmo bovs are illegal

this is for petrols btw

X2

[tweak'e]

The only real use of a BOV is to vent the excess pressure build up in the intake pipes when the throttlebody shuts which helps lessen lag and prolongs the life of a turbo as a diesel doesn't have a lot of lag anyway due to it not having a butterfly as such and the aslo not drawing a vacuum it ,imo, would be a waste of time to put one on a diesel

the other thing is not so much excess pressure but just normall boost.
when running very high boost, the slowing down of the motor (especially if stalled in comp use) means the boost in the intake pipes has no where to go, so it trys to go backwoulds through the turbo.

have a read up of "turbo bark" in diesels.

even in our usuall lower boost motors the bov bleeds off the boost lowering the load thats on the turbo which helps keeps the turbo spinning. that alone can help with some motors.

[sloshy]

Is this so redneck or is it just me?

[berad]

BOVs can not be fitted on diesels as they have no throttle butterfly to trap boost pressure.

x2 correct, the rest of you need to research how a bov/motor works

[berad]

you don't need a butterfly in the intake to make them work.
run them off the vaccum system and electrically triggered, usually with throttle and clutch switchs.
effect is usually small but some of the highly worked motors have found they help a fair bit. it will depend a lot on what turbo etc your running.
i don't think they are worth the cost.

check out surf forum, there is a few guys running BOV on them.

Correct though what a pain in the arse for a minimal improvement on a diesel, their spooling almost instantly which lag is not a problem.

If a 500+hp prime mover has no bov system i dont see the point of going to hours and hours of effort to plumb in a bov system. When the prime mover is after minimal lag for pulling massive loads.

[lysdexia]

BOVs can not be fitted on diesels as they have no throttle butterfly to trap boost pressure.

x2 correct, the rest of you need to research how a bov/motor works

just again, QFT

you CAN NOT run a bov on a diesel, unless it's some werid ass diesel that runs a throttle body.

without a throttle body, there's no built up pressure to release, it just gets sucked straight into the engine..

[berad]

For anyone wanting a "sick" noise when they change gears, if they havnt got the turbo bark im happy to post a cd for $200 which will have a bov noise over and over again for the length of 80 mins

[tweak'e]

BOVs can not be fitted on diesels as they have no throttle butterfly to trap boost pressure.

x2 correct, the rest of you need to research how a bov/motor works

just again, QFT

you CAN NOT run a bov on a diesel, unless it's some werid ass diesel that runs a throttle body.

without a throttle body, there's no built up pressure to release, it just gets sucked straight into the engine..

you guys need to brush up on your engines. a lot of late '80s to 2008 have butterfly's, used for emmision control. ones like toyota 1kz are operated off the throttle. take foot off the throttle and butterfly shuts.

however typically you would remove the throttle rather than fit a BOV.

[tweak'e]

you don't need a butterfly in the intake to make them work.
run them off the vaccum system and electrically triggered, usually with throttle and clutch switchs.
effect is usually small but some of the highly worked motors have found they help a fair bit. it will depend a lot on what turbo etc your running.
i don't think they are worth the cost.

check out surf forum, there is a few guys running BOV on them.

Correct though what a pain in the arse for a minimal improvement on a diesel, their spooling almost instantly which lag is not a problem.

If a 500+hp prime mover has no bov system i dont see the point of going to hours and hours of effort to plumb in a bov system. When the prime mover is after minimal lag for pulling massive loads.

yes its a pain and big cost for minimal gains, hence why i wouldn't bother.
however get a light weight vechile and youve fitted a bigger turbo or its simply has a crap turbo that your pushing to the limits, a BOV can make a fair bit of improvement.
its just not a big effect like on a petrol motor.

[berad]

I agree, but what are the costs to set it up and the years it would take off your life in stress haha, if you were to set it up your self, chances are you are smart enough to make a turbo adaptor and new dump for next to nothing even payin for it would cost 200? for both, a 2nd hand good cond t28bb is 300-400?, 600 for a superior turbo that will spool earlier, come on harder and hold boost, a massive upgrade for minimal cost.

[tweak'e]

I agree, but what are the costs to set it up and the years it would take off your life in stress haha, if you were to set it up your self, chances are you are smart enough to make a turbo adaptor and new dump for next to nothing even payin for it would cost 200? for both, a 2nd hand good cond t28bb is 300-400?, 600 for a superior turbo that will spool earlier, come on harder and hold boost, a massive upgrade for minimal cost.

the ones i've seen have all that already. bigger turbo's, added intercooler, tuned injection etc etc.
BOV just big cost for minimal gains, but if they have the $$$ and want max performance.
law of diminishing returns, the last little bit of performance costs a lot.

[berad]

I know, unless they have a money tree, or are wanting to squeeze every .1 of a sec out of the car down the strip which they wouldnt i find it slightly amusing, although each to their own.