running no bov

[fcdrifer17]

i just met a couple guys who arnt running no bov's on there sr..
is it safe? will it do harm to the turbo?
they have been running them for about 6 months now with no problems and they all have fmic and no bov sounds nice... makes a wierd noise but its cool
lmk..

[chibo]

That weird noise is compressor surge, it will kill the turbo... Unless there is something that they didn't tell you about their setups.

[DrtyRat]

Search around...I know that this has been discussed before. There are quite a few people on here who have been running their sr's for a couple of years w/o bov...I would try to find it but i have to go to work.....gl

[upSLIDEdown]

A friend of mine runs no bov on his SR. The weird sound you're referring to is compressor surge. It's a fluttering/whirring sound. No bov will decrease the life of the turbo, but it's not like it's gonna kill it in a matter of months. Many people run that way without problems, but make no mistake, it will shorten the life of the turbo.

[Revolver Ocelot]

Was Dousan the guy you met? I remember he wasnt running a bov and he lives in socal too.

[90RS13]

You can have no bov and not hurt the turbo all the while, keeping the turbo spooled better than with a bov. If the compresser comes after the throttle body then when the butterfly shuts it sends the compresser into vacum. The turbo spins freely, and doesn't have to deal with getting pressure thrown back at it. There are major drawback though. If you use this type of set-up, you should never use silcone or sleeve type couplers for your piping after the compressor. Only bolt together flanges, because is a coupler were to fly off, slide off, whatever, the engine will ingest as much air as it can before you shut down the igition or fuel pump. Not a good situation. Most people that run these set-ups (rally) use them with a intercooler in the engine bay (wether it's a above,beside the engine, or a v-style with the radiator) that way, you can weld all the piping together and only have to have bolted flanges at the intake mani and the compressor outlet. Both of these have good flages that you can use already too. For the intake mani you can just use a spare TB and take out the butter fly. Then it makes a nice flange for bolting to the intake mani. Anywho, this ran kinda long but hope it helps.

-matt

just to clarify it would look like air filiter------TB-----compressor----IC------Intake manifold

[Dousan_PG]

i run NO bov
dail drive 1bar boost stock t28
friend w/ a Rb25 making 400+ hp heavily tracked, runs no bov since day one he got the car running (mark slide squad)

its fine.
ist not as bad as people make it but yes over time it will hurt the turbo.
my friends in japan run bovs but are usually so tight they dont open up haha...
others dont run it at all and run 350-400 HP d1gp/bm hai cars.

its been discussed a lot, its really up to you what you want to do.
make that executive decision!

[SoSideways]

You can have no bov and not hurt the turbo all the while, keeping the turbo spooled better than with a bov. If the compresser comes after the throttle body then when the butterfly shuts it sends the compresser into vacum. The turbo spins freely, and doesn't have to deal with getting pressure thrown back at it. There are major drawback though. If you use this type of set-up, you should never use silcone or sleeve type couplers for your piping after the compressor. Only bolt together flanges, because is a coupler were to fly off, slide off, whatever, the engine will ingest as much air as it can before you shut down the igition or fuel pump. Not a good situation. Most people that run these set-ups (rally) use them with a intercooler in the engine bay (wether it's a above,beside the engine, or a v-style with the radiator) that way, you can weld all the piping together and only have to have bolted flanges at the intake mani and the compressor outlet. Both of these have good flages that you can use already too. For the intake mani you can just use a spare TB and take out the butter fly. Then it makes a nice flange for bolting to the intake mani. Anywho, this ran kinda long but hope it helps.

-matt

just to clarify it would look like air filiter------TB-----compressor----IC------Intake manifold

That's how you have to run the Formula SAE cars if you have forced induction.

However, are you sure WRC cars are setup that way? I could have swore that I heard compressor surge when they actually let off for a few corners...?

[driftstyre]

There are no rallycars that run a pre compressor throttle body. With the majority of antilag systems, when the throttle is closed, the air will either be plumbed around the throttle into the intake manifold or plumbed into the exhaust manifold via a solonoid (or the throttle will just be stepped open to a certain % of TP)

[hellion240sx]

A friend of mine runs no bov on his SR. The weird sound you're referring to is compressor surge. It's a fluttering/whirring sound. No bov will decrease the life of the turbo, but it's not like it's gonna kill it in a matter of months. Many people run that way without problems, but make no mistake, it will shorten the life of the turbo.


wait wait wait i have a bov but i still hear fluttering sound after i rev it up? i am confused now? can someone clear this up. i have a greddy type rs. i thought that was normal?

[Dousan_PG]

itrs more then a 'flutter'
sounds like a pigeon trying to fly out from under your hood
like that
sounds like bird wings.

haha..i dont know how to describe it..

[hellion240sx]

heh yeah that didn't help, but thanks :) well its when i'm idle i can hear it, of course. can't when driving heh duh :D but does that make a difference?

i guess it would be a little more uh ... I can't describe it either!

[Dousan_PG]

idle if your hearing that noise something is wrong hahaha
thats not bov or turbo u got some other problems.

or your RS is too loose
you can tighten losen it to open up easier/harder
ist adjustable

[hellion240sx]

well no, put that wrong. example, someone says let me hear your engine. i say ok. start car, rev to about 6500rpms, and let go of gas, hear bov, then flutters right after. is that better?

[fcdrifer17]

i did search and got about 500 treads and only went over about 100 with nuthing i was looking for...

so can i just shup my greddy type s till no air releases? will i hear the compression surge? its the same thing right?

[kuramaya]

I run mine so tight that it only releases at .5 bar boosts or higher...I get surge at all low RPM shift..

[hellion240sx]

could it be that i'm running it too tight?

[kuramaya]

could it be that i'm running it too tight?

yes according to your post above..if you rev it to 6500 and it blows off but still has some comp surge..it is too tight...thats a high ass rev anyway

[SoSideways]

well no, put that wrong. example, someone says let me hear your engine. i say ok. start car, rev to about 6500rpms, and let go of gas, hear bov, then flutters right after. is that better?

Don't do that chit.

That's uncalled for.

That's like, someone saying to you "hey, lemme see a pic of your gf" and you going "ok, here's a pic" and you go to show them a pic of your gf with jizz all over her face.

That's uncalled for.

But yeah, starting your car then revving to 6500 rpm will pretty much oblitterate your seals, especially when the car's cold. Even when it's fully warm at operating temps, you still shouldn't rev that high in neutral with no load. That's uncalled for.

[90RS13]

That's how you have to run the Formula SAE cars if you have forced induction.

However, are you sure WRC cars are setup that way? I could have swore that I heard compressor surge when they actually let off for a few corners...?

sorry I didn't mean WRC specifically

There are no rallycars that run a pre compressor throttle body. With the majority of antilag systems, when the throttle is closed, the air will either be plumbed around the throttle into the intake manifold or plumbed into the exhaust manifold via a solonoid (or the throttle will just be stepped open to a certain % of TP)

no rally cars? I've read that they also used systems like this sometimes but guess I'm wrong sorry

[andrewmp6]

only way i wouldnt run a bov is of the car was a auto since you dont let off the throttle but i have always ran one and you should unless you like buying a new turbo

[RSP13-Sideways]

Blow-off valves are kiddy shit and overated. Just my opinion.....

[andrewmp6]

rsp13 you might wanna read this before saying somthing that stupid http://minimopar.knizefamily.net/perf/bov.html#works

[s14slide]

I run one, but it's screwed down all the way and my boy does'nt run one, both sr, I'm stock and he's running a T28 at a bar. Been running like that for over a year both, and we have never had any probs. And neither of these cars have a gas pedal that gets babied. Your call, but if your not pushing crazy boost, it's not a big issue. If you want longevity, get a civic.

[MasterOFDrift]

i run no bov, been running no bov on my sr for a couple of months.

Its pretty much preference, bov will elongate the life of the turbo however by how much it is, it's probably more relative to the setup. I think that bov's are nice but not neccesary. The whole turbo will blow up A LOT sooner idea is more of a con by the import companies to get you to buy those $200 valves. Also the pshh sound is a good marketing scheme hahahha.

anyways bov<bov less

[RSP13-Sideways]

I'm going to have to say it again.....they're overrated. Most shops that I go to run high horsepower TwinTurbo Z33's and G35's never have blow-off valves.....they're just overated.

[sdtouge]

no bov
waste of money
i didnt run one on my ca for over a year. sr t25 and gt28rs (aka s15 spec r bb or whatever lol)

your fine. your also fine without coolant flowing to the turbo, just let it cool down for shure.

[fcdrifer17]

so how tight should the bolt on a aftermarkit bov be? 1/4" in?

[Cashizslick]

itrs more then a 'flutter'
sounds like a pigeon trying to fly out from under your hood
like that
sounds like bird wings.

haha..i dont know how to describe it..


Could that be the wastegate on your turbo?? /n00b

[nrg]

I think Dousan_PG is runing Internal Gate on his turbo. So it wont be the sound from his wastegate.

[Dousan_PG]

i got a rad stock t28 whooo hoooooooo

[sdtouge]

wastegate would sound more like a lion trying to get out from your hood lol.

[RSP13-Sideways]

rsp13 you might wanna read this before saying somthing that stupid http://minimopar.knizefamily.net/perf/bov.html#works

OMG :bite: It's written on the internet, so it must be right!

[hellion240sx]

anyways i don't do it when its cold. never. period.

it could be the wastegate. I DON'T KNOW.

i will untighten it tomorrow. i tightened it a lot b/c i am venting into the atomos, and it would stumble. so i figured if i tightened it it wouldn't. but it hasn't stumbled. getting an safcII then tuned! soon.

[DoriftoSlut]

Could that be the wastegate on your turbo?? /n00b
Do you even own a turbo? Besides his stock T28 (already said) having an internal WG (implied), an Ext. WG sounds nothing like a pigeon. Ext. WGs sound like Linda Blair from the Exorcist. Or Lions, that's a good one too.




Compressor surge is compressor surge. It always sounds like a pigeon.

"/idiot."

[kuramaya]

it could be the wastegate. I DON'T KNOW.
.
Ahh you would know...Just take a pic from your Turbo manifold to downpipe and we can tell you:naughtyd:

[hellion240sx]

awesome, thank you. i will try to have the pic up tomorrow, when there is day light.

[McRussellPants]

I ran no bov for about two weeks then had a greddy type S put on.

Fuck Type S - it sounds like nails on a chaulk board and it runs so rich shifting and coasting down my oil smells like gas.

I know the T25 is fresh since it looks brand new and we found the thrust washer from the old one in the oil pan so I think it will last a good while surging.

Whatever... its not like the T25 is anything worth holdin on to.

[Silverbullet]

Fuck Type S - it sounds like nails on a chaulk board and it runs so rich shifting and coasting down my oil smells like gas.




wanna know how to fix your problem? Recirculate it LOL

But overall the design of the Type S is terrible.

and yes, i believe BOV is over rated as well. Last year, i had my vac line for my stock BOV hooked up wrong for over half a year without any problems. How i found out was when i got new piping and an aftermarket BOV. the BOV didn't vent so i redid the vac and found out it wasn't even hooked up right before lol. Im hearing more and more ppl running no BOVs now. My new new piping dosn't have a BOV flange or port on it, i plan to keep it that way. And like McRussellPants said, the T25 isn't worth keeping anways.

[hellion240sx]

HAH yeah not wortth keeping, lol. but sorry i couldn't get the pic tonight. i will have it tomorrow. only work half a day tomorrow. so yeah you'll see a few.

mmmmm nails on a chalk board. sadly i have the type rs. has a pssh like sneezing lol.i love it tho.

[McRussellPants]

wanna know how to fix your problem? Recirculate it LOL

But overall the design of the Type S is terrible.

and yes, i believe BOV is over rated as well. Last year, i had my vac line for my stock BOV hooked up wrong for over half a year without any problems. How i found out was when i got new piping and an aftermarket BOV. the BOV didn't vent so i redid the vac and found out it wasn't even hooked up right before lol. Im hearing more and more ppl running no BOVs now. My new new piping dosn't have a BOV flange or port on it, i plan to keep it that way. And like McRussellPants said, the T25 isn't worth keeping anways.

I think recirculating it would be too much effort. the outlet on the type S is bigger than the hole on the inlet pipe, I dont have the fitting for the inlet either.

Im just gonna get a new 2in pipe for my OEM hotpipe and sell my Greddy to some Mitsubishi kid...

[Silverbullet]

I think recirculating it would be too much effort. the outlet on the type S is bigger than the hole on the inlet pipe, I dont have the fitting for the inlet either.

Im just gonna get a new 2in pipe for my OEM hotpipe and sell my Greddy to some Mitsubishi kid...

It's not too hard. I used a heater hose that fitted over the Type S outlet, then fitted that OVER the hose that fits into the intake.

Most DSM ppl rn't too fond of the Type S BOV either.

[hellion240sx]

mna i only got to take one shot so if you need another one, your gonna have to wait a few hours. 6 batteries are dead, so gotta recharge

well just tried to upload it but it's 264kb. so i'll take it tomorrow grrrr.

hmmm might do a write up... but need to do some research 1st.

[ryan hagen]

the enjuku cars ran no bov at chicago formula d, they said they did it for awhile and found no damage, they just said not to do it with a stock(used/old) turbo.