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im looking for a forum thats strickly for turbo cars. something with a large member bae and people who know what theyre talking about. ive got a couple questions, wlel one big one im trying to figure out

 
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what kind of information are u looking for? just general turbo tech?

you'll probably find a lot of good information on the supraforums (takes forever to get u'r account activated though - it's been 3 days now and still nothing for me), vortex (unter the technical forced induction sections), e30tech.com...

there's probably no single turbo forum out there... but any good solid forum will have people that know what they're talking about. just because you don't drive the same car the majority do there doesn't mean they can't help.

 
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As Notorious says, its better if you focus on a certain platform because alot of ppls knowledge is limited to just that. I would recommend SRTForums if your interested in big turbo setups and so on, 60% of the members on that forum dunt have stock turbo systems

 
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Homemadeturbo.com these guys are good

 
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well the car is boosted and has alot of work done to it. im trying to find out a couple things actually, first off, my buddys 180sx is running no bov, just a wastegate, ive been trying to figure out how that setup is safely run. ive seen this setu pon a couple cars now, infact roguevettes vette if i remember right runs two wastegates and no bov. also im contemplating adding spray to the car but i wanna run it before the intercooler so that it mixes withthe hot air and wanted to find more info abou that. basically what kind of gains id find vs jet size and also if its possible to just run say straight co2 for cooling with no negative effects.

 
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My understanding is that the no BOV turbo systems tend to be harder on the head units. The old dodge daytona systems run the same type of setup.

 
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Try turbobuicks.com
Grand national and T type site
Not many of those guys running blow off valves.

 
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Supraforums would be a great place to search and find info. But it will be a horrible place to actually make a post asking questions if you tell them its for a z24 (nothing personal from me, they are just all ******** there and think supra is god.)

Running without a BOV/BPV is not advisable if its going to be a frequently street driven car. It puts alot of un-needed stress on the compressor wheel/shaft. I don't really see a purpose of not running one, a propperly sized BOV for your application should not leak under boost, maybe slightly at idle if you go to something as huge as the Godzilla BOV...

I am not to familiar with nitrous so I can't help you there....

As for a CO2 sprayer, I have seen many setups with nozzles on the IC spraying CO2 without issues. It will drop your IAT's several degrees.

 
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When the bov doesnt release the pressure built up when the throttle plate closes, the air rushes out back into the compressor wheel and damaging it.
BOVs are said to increase the life of a turbo.

Have you considered water or meth injection?

The best thing for cooling is air because co2 (i suppose u mean a system such as CRYO2) needs to be re-filled. or maybe a water/air intercooler im not sure how those work tho.

 
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Alright guys back to the basics! The purpose of a BOV:

A BOV is hooked up between the turbo and the throttle body to eliminate pressure spikes between closed throttle conditions. The valve has a vacuum line hooked up to the back of it and is bolted to the intake pipe somewhere between the turbo and the throttle body. When in boost there is pressure on both sides of the valve and is equal, meaning the pressure in the charge pipe and the pressure in the intake manifold is the essentially the same. In closed throttle conditions intake manifold pressure drops and turns into a vacuum and same with pressure on the otherside of the valve. The pressure on the valve the vacuum draw from the otherside causeing the valve to open. Now there is a spring in the bov which can keep tension on the valve in part throttle situations where vacuum and pressure is moderately seen. This helps so that the BOV doesn;t stay partially open causeing lack in performance. The better BOV's on the market have a number of springs you can buy or that it comes with to eliminate this problem. They might also has a screw or nut to adjust aswell.

Now essentialy you see the role of the BOV and if the valve was not there it becomes unhealthy for the turbo. The pressure built up between the throttle plate and the compressor wheel is greater than that of the turbo output. This is very unhealthy for the turbo's life because the pressure builds up to the point where it can slow down the speed of the compressor wheel because that air has no where to go and it tries to back track. This is refered to alot as compressor surge!

Now a wastegate basically operates on the same mechnical functions as the the BOV, but what it does is regulates exhuast gases. If there were no wastegates the turbo would spin as tremendous speeds because is would see 100% of the exhaust gases flowing through the wheel. The wastegate relies on pressure just like the BOv and it releases excess gases past the turbo and back into the exhaust so that the turbo spins in a controlled maner. The sole purpose is to regulate exhaust gases, which essentially controls boost amounts (psi).

I do not have alot of experince with No2, but there are kits out there from nitrous express which can spray no2 on the cooler to lower air temperature. Also like the guys were saying methanol injection is another route for lower temperatures. I don;t know exactly what you are looking for so i can;t help you out there.

I personally haven;t seen a car with no BOV from factory and i don;t see why there wouldn;t be one there.

Also if you have any questions don;t heistate to ask! there is a good bunch of knowledgeable poeple on this site and they just don't have oppurtunities to help poeple because good technical questions are never usually asked.

 
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As stated already here... Not recommended for a street/daily car. A lot of older turbo race cars (possibly even newer ones, but i'm not too sure) didn't have BOV's, it's quite a distinct sound. But as stated, not good for your turbo in any way.

Wastegate and BOV have separate functions.

While I've never had N2O on a turbo car, I don't think it would be advisable to put the nitrous before the intercooler as it will start to puddle. Also the amount of time that it has before it enters u'r engine doesn't determine how much colder the charge is afaik.

That is obviously best done on a dyno. It also depends on your engine management. If your running standalone it'll probably have an option to turn on the nitrous and adjust fuel and timing all in one shot.

CO2 isn't injected into u'r engine, but it's a good legal alternative to cooling u'r intercooler w/o the hassle of worrying about cops and a connected N2O bottle in u'r trunk.

 
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car already has meth injection. i knwo all too well evreything you gys are saying in regard to bov snad wastegates. ive just been trying to figur eout how they get away with so much boost and no damage. my buddies 180 was a street car, he even drove the thing to work and it just made me wonder if it was somehow using the wastegate to vent air in some way.

for the nitrous, it would be essentially a dro pshot, no fuel being added, just straight nitrous for cooling and any compenssation that needed to be made could be made through my computer. im just trying to see if i can combine the meth and nitrous together to get some more hp fro mthe car. my intercooler does a great job of cooling down the air, at 30x8x3 it better, lol, but i wouldnt mind helping the hot air out pre intercooler by injecting a little spray into it and then helping it out again with the meth kit.

thanks for all the input

 
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I think your better off with race fuel then trying this out! you might do more harm then benefit, however it is an interesting idea to say the least.

 
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im jst looking for added cooling from this. im already running meth through the motor so i dont really need race fuel. but if i can get an extra 25 or 30 hp by cooling the air before it hits the intercooler and then mixing that with meth then im all game

 
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why not get the nx express cooler kit? This way you get the provided cooling you want and basically does the same thing you are saying. I beleive the kit is called the ntercooler. This is probably the easiest way to get a higher intercooler efficiency on a street application.