clutch kick drifter

http://videos.streetfire.net/search/...8250795ac2.htm Is this all compressor surge? Answer this question.... does he have a blow off valve or not?

McRussellPants

It sounds like it has a BOV but its sprung to tight.

The most baller sounding 240SX ever was the Falken S15. nothing but the beautiful sound of ass raping the bearings out of a 3071.

dc2_lsvtec

why was his motor smoking?

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clutch kick drifter

HEll YEAH!

clutch kick drifter

cuz SR's suck

redsuns3838

sounds like hes getting some blow off but its too tight. But some track cars dont run them because they dont care about turbo life that much, and would rather have preformance benefits instead. Just depends on how much $ you have to spend.

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derk

the motor wasnt smoking.

it was the sprayer for the intercooler, i forgot wether it was water mist or nitrous that the used though.

but it isnt smoke thats for sure

clutch kick drifter

my question is though where in the hell do you benifit from surge? Pretty sure it dosnet make the turbo spool any faster does it?

GSXRJJordan

This is something that not many outside competitive drifting know about - very few cars use blow off valves.

That sound you heard is compressor surge ~ a BOV really only vents once, maybe twice if you've built up a lot of pressure. Whenever you hear the multiple 'pssht' sounds, that's compressor surge. The Formula D car I worked on was a lot like the Falken S15 mentioned above - RB25, GT3076, and no BOV. The newer GT30R series turbos have special vanes around the compressor intake to relieve a little bit of the surge and to make the compressor surge sound even louder, which is what everyone wants, cause it puts V8's to shame =D

Anyhow, from a performance standpoint, no BOV means your hotpipe/intercooler stay charged with pressurized air, so your throttle response is 'better'. I put 'better' in quotes because I never enjoyed the jerky feeling, I like to build power in a drift, let off, and have a second to build it back up again, but whatever. From a competitive DRIFTING perpective, it's all for the crowd - people love hearing turbos.

That's all. Put that SSQV back on, you dont have 3 spare turbos that Garrett bought you sitting on a shelf in your shop. Keep your bearings/seals in good shape.

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clutch kick drifter

^^ thanks man

spoolin_s14

sounded like a revlimiter and a hks ssqv to me? my car does the same at lower bost

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HalveBlue

^^Same here.

Although, I don't know about the rev limiter part, since I don't have one.

And since the newer SSQVs aren't adjustable, even if it is too tight you're SOL.

McRussellPants

I ran no BOV on a T25 for a year or so and it didn't shit its pants.

I'll be doing the same on a bb T28.

Compressor surge rules the day.

hellion240sx

not trying to promote this bov, but very useful info...

http://videos.streetfire.net/search/...3f0150f005.htm

+1 for me

Team Rootbeer

welcome to the club.

mine shit out on me along time ago, and i just took it off and welded up the pipe. fuck that noise.

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chibo

Hm, that seems kinda neat. Research time

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sbanzer123

i dont know if i agree with that. because when you run no bov, and your compressor surges. when you step on the throttle again your starting out with a turbine that isnt spinning or is spinning in the opposite direction. so that to me would seem like it would take more time to get spooled up again then having a spinning turbine and half empty intercooler piping, because not all the air in the piping is vented out. just my .02

misfitsfreak81

i absolutely agree. compressor surge is when the charged air in the piping comes back and "hits" the compressor momentarily stopping or even reversing the flow. this is not something that you typically want, and is arguable as to any performance gain or not. anyone that hears this and doesnt have a couple spare turbos should cringe with fear.

chibo

Compressor surge being a performance gain is the dumbest shit I've ever heard in my life; who ever said that should go read Corky Bell's book rather than listen to what 'professional drifters' have to say.

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annie4rb20

+1

On the importance of BOV's..

"The pressure spike can also throw the compressor into surge, which can cause it to overspeed and damage the wheels by causing them to bend or even burst. Severe surge will fracture the compressors blades. Spinning at 120,000 rpm, even the slightest unsymmetrical weirdness in a wheel can cause it to burst explode. At best the pressure wave will drastically slow down the spinning turbo causing a loss of power, as the turbo must respool to re gain boost pressure after the shift."

From Mike Kojima himself... Nissan Performance Mag

hellion240sx

so how do you eliminate comp surge?or is that something that you have.

McRussellPants

lol, Corky Bell.

Or I could go out and drive my car with no BOV and like it.

PS, thanks for bumping this shitty thread so you could play Mr. Engineer since you read some shitty 100 page picture book from the 1970s.


lol.

upSLIDEdown

A good friend of mine has run without a BOV on all of his SRs. Never had a turbo blow. Granted he has sold them all fairly quickly too. While compressor surge will shorten the life of the turbo, it will NOT do so in 5k miles. It does cut down on turbo life, but not by leaps and bounds. Plus, from what I've been told, it isn't that expensive/difficult to rebuild one; granted I've never had to do it, so I wouldn't know.


P.S. Surge still sounds FUCKING BADDASS!

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chibo

I wish you luck, good sir.

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clutch kick drifter

thanks for the responses.

Ca_laurier

wow that totally sounded like mad compression serge. i was running a gt28r and had a sard high boost bov that was to tight and it sounded exactly like that.

This year i am not running a bov for a bit but thats on a crappy ca t25 so i could give a rats ass what happens to it, just gives me a reason to upgrade and than i will consider a bov

white97s14

i like that bov but i will always love the hks

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codyace

IIRC Maxium boost was published in the mid to late 90's...but who's checking?

Why bother making the point when you have no long term information. Megan Racing manifolds are good too for at least 100 miles...

You bet your behind it could kill a turbo in 5k miles. If you actually abuse the shit out of your car, it could...undoubtedly.

If you don't know, then don't post it. This is how mis information gets spread. Rebuilding a ball bearing turbo is NOT cheap/impossible...if you chuck one, you're usually out the 600-800 a replcament CHRA costs you on a GT series b/b turbo.






I run a BOV because i'm a girl., and can't afford replacing turbos like they mean nothing. I've realized that being 'baller status' on a forum usually makes you look silly to 95 percent of the rest of car guys....

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clutch kick drifter

^^^ !!!! YES , PUt them to shame. Baller status is the way to go ! lol

upSLIDEdown

I wasn't making any particular point, just giving some input from my experiences.


Again, from my experiences, it hasn't. I've seen him go through at least 3 cars running them this way, all of them definitely longer than 5k miles. Saying it COULD is worthless, because it just as easily COULD NOT. That's like saying you could die in a fiery car crash tonite, you just as easily could not.



Again, that's the reason I said I didn't know. I'm probably gonna run a BOV, but I haven't fully decided yet.



At least you can admit it... Relax, I'm just kidding with you man. Like I said, my post was from my experiences. If I don't know something, I'm sure as shit not gonna tell you it's the truth. I was actually also told by another good friend of mine that had and EVO, that when he took his BOV off alltogether, the car's driveablility was a LOT better.

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