The definative running without a BOV thread

[Swampy442]

What I want :- real world experiences from single turbo owners running without BOVs, good and bad, mileages covered before failure or just mileages covered.

 

What I dont want :- "oooh you dont wanna do that" "my mate did that and his turbine literally flew out of his turbo and killed him. Stone dead. True story" "heres a link to...." "some guy in Kazahkstan has run a T99 without one for 40 years and no problems"

 

Thanks in advance

[pedrosixfour]

Speaking of BOV's...............

[Lukeyboy2k]

I'm running a PHR street kit without a BOV. I like the sound. I've covered approximately 14,000 miles since my single conversion over a combined period of 10 months in the last 2 years. This is split approximately 50:50 between slow urban commuting and spirited motorway driving.

 

 

The turbo still works.

[Swampy442]

Thats what Im after, thanks very much So no smoke, no compressor damage, no undue noise?

[hodge]

My blue supra ran a GT45 turbo without a BOV for the length of time I had it. And to this day I'm not aware if it breaking.

[Lukeyboy2k]

Thats what Im after, thanks very much So no smoke, no compressor damage, no undue noise?

 

Only smoke is from valve stem oil seals on start up - none from the turbo. I haven't had a close look at the compressor, but all seems to go very well. There is no undue noise - just cool flutters etc.

[hodge]

On the other hand my new build I'm running 2. There 50mm turbosmarts, just to be safe lol.

Seriously I think your going to get a very mixed opinion on this. Personally I'd say give it a go and see what happens.

[Swampy442]

Which is why I said I dont want opinions mate, just what people have experienced good and bad And I think 14k miles without a BOV and no issues is a good start.

[j_jza80]

My GT35R single came without a BOV. I did approx 10k miles in that car, with no problems at all

[sdistc]

Mine ran without BOV for 15000 km (lots of highway and urban driving, but plenty of WOT pulls ) without a problem. As I've noted, all of my friends with single turbos run without BOVs on 67+ mm turbos on 20+ psi boost - driven hard and no related problems that I've heard over 3 years.

[Swampy442]

Cheers Andy My turbo is in the throws of needing a rebuild so might get it done and run BOVless afterwards. Or just bolt on the stunt T04R and cane it lol

[johnny g]

Craig, I know Chris Wilson runs his cars without a BOV, and they survive trackdays. Drop him an email and he'll give you some good info.

[Kirk]

I know you just want people's experiences but i think a little discussion should be allowed.

 

I myself wouldnt run one if that helps

[jevansio]

Great thread, I want to remove mine, might just do it anyway

[Swampy442]

Lol Martin, a little opinion will no doubt descend who's right and who's wrong, this way people can form opinions on the supplied data

Jay Im thinking it myself, 4 experiences, all positive so far.

[Guest initial_j]

as with all these internet myths. the people that think there dangerous you will find 99 percent have "heard" its bad for a turbo

 

the people who realise its bollocks all base their opinions on fact and experience

 

ive personaly built and run a hell of a lot of turbod cars, and always remove and block dump valves. no problems to report here.

 

 

and if you want DEFINITIVE proof, how many turbo charged race cars run dump valves?

 

answer= none.

 

think id take advice from people that do it for a living instead of people who read something once on a forum

[jevansio]

I just ordered a 3" intake pipe to replace the section mine is on, might wait until after next week when it's mapped before fitting it just incase

[dr_jekyll]

So, is there any advantage of having a b.o.v? i would rather run without it but the old compressor stall and baring wear stories sit in my mind

[Paul]

as with all these internet myths. the people that think there dangerous you will find 99 percent have "heard" its bad for a turbo

 

the people who realise its bollocks all base their opinions on fact and experience

 

ive personaly built and run a hell of a lot of turbod cars, and always remove and block dump valves. no problems to report here.

 

 

and if you want DEFINITIVE proof, how many turbo charged race cars run dump valves?

 

answer= none.

 

think id take advice from people that do it for a living instead of people who read something once on a forum

 

So the folks at Toyota were a bunch of c*cks for fitting a BOV in the first place?

[Guest initial_j]

no. it was built as a road car with engines built around emmisions and fuel consumption/noise reduction

 

RACE cars are built for speed and performance. so decide what you want.

 

the question is will it cause damage. the answer is no. this is based on a lot of personal experience from cars ive had and cars friends of mine have had.

 

if you have some experience evidence to suggest otherwise, suggest you share it? as answering with a question about what toyota designed 20 years ago is not that.

Edited November 10, 2010 by initial_j (see edit history)

[sdistc]

Cheers Andy My turbo is in the throws of needing a rebuild so might get it done and run BOVless afterwards. Or just bolt on the stunt T04R and cane it lol

 

Well, I always vote for caning it

Although, if you have a bit of spare cash you could snap up Miko's brand spankers billet?

[Swampy442]

J race/rally teams dont use them Im guessing because a new turbo is a drop in the ocean should it go.

 

Andy all my cash is going on the manual conversion at the mo mate.

 

Craig, read the first few posts, 15,000 miles with no bov on a single turbo with no problems

[Chris Wilson]

I have not run a BOV on any turbo engine of mine for many many years and have never found the turbo either fails, nor wears prematurely as a result. Lag is unchanged, maybe even reduced without a BOV. My opinion is shared by Turbo Dynamics and by Geoff Kershaw who owned Turbo Technics, as well as by Ken Brittain late of Brodie Brittain Racing, who are two of the countries leading experts on turbos. http://www.morego.co.uk/bbr-gti/two_bs.php A "BOV" was simply used to stop turbo noises when suddenly closing the throttle, the noise was thought to be sufficient to annoy or worry early turbo car customers. It wasn't designed to increase turbo life, nor to reduce lag.

[Swampy442]

And there you have it folks, thanks for the input Chris. Anyone wand an HKS SSQV? Lol

[Guest initial_j]

I have not run a BOV on any turbo engine of mine for many many years and have never found the turbo either fails, nor wears prematurely as a result. Lag is unchanged, maybe even reduced without a BOV. My opinion is shared by Turbo Dynamics and by Geoff Kershaw who owned Turbo Technics, as well as by Ken Brittain late of Brodie Brittain Racing, who are two of the countries leading experts on turbos. http://www.morego.co.uk/bbr-gti/two_bs.php A "BOV" was simply used to stop turbo noises when suddenly closing the throttle, the noise was thought to be sufficient to annoy or worry early turbo car customers. It wasn't designed to increase turbo life, nor to reduce lag.

 

exactly.

 

however theyll be hundreds disagreeing because "they read on the internet there bad"