they will replace under there warranty. good enough for me. They are testing out new 20g turbo on my car. they also replace intercooler. radiator, front shock tower brace. all intercooler pipeing, downpipe,exhaust and computer.

 

It actually doesn't hit with the same pressure. In fact it doesn't really get hit with pressure at all. It abruptly hit a "brickwall" in simple terms. The differential pressure on the shaft is what causes the damage.

 

Most pictures I've seen of the CyberEvo show a block-off plate over the BOV flange. They're probably willing to sacrifice longevity for 1-lap of glory.

Either way I'd tell your Deep Throat top-secret operative deep inside the JDM scene from behind the walls of Super Street to take a hike.

 

If you have a surge ported compressor cover then you could run w/o a BOV on some applications. I run a Forge w/ the stiffest spring and it never opens. The surge porting gets rid of the backed up air.

 

way back in the day, BOV's or bypass valves were not used...the reason was because systems tended to run very low boost levels, and as such, venting the air really caused no benefit. However, as engein management systems improved and boost levels were able to be raised even on factory systems, bypass valves, pop off valves or blow off vavles were introduced in order to combat compressor surge. It was done as a reliability mod, not really as anything performance enhanicing (at first). In the old school, wastegates were not used either....the turbo would just make what it could make, and a pressure relief valve would vent, allowing a consisten boost level to be maintained.

Nowadays, I have not seen a single "JDM" tuned car that did not use one, or more than one - heck, even the Evo WRC car uses one.

Your car does have a blow off valve from the factory, and for factory boost levels it works reasonably well. As soon as boost is increased or a larger turbo fitted, you will quickly find the limitations of a stock unit, at which point an aftermarket one can do a world of good (provided you pick the right one for your needs)

 

yeah back in the 70s-80s BOV wernt used.....but pushing 21psi one dircection then haveing it go the other way...maying the turbine backspin....no good.

 

I have also heard this little rumor that the Japanese don't use BOV's. You know what though? Who gives a ****? Like someone before me said they also buy soiled panties. Ricers might be a joke here but, from the videos I've seen, I think they might be an epidemic in Japan.

Adam, thanks for clearing this all up, pretty interesting stuff. So did car back in those days not have ANY sort of pressure outlet from the factory, must be some pretty weak turbos?

 

very weak indeed - we have a T3/T4 here from an OLD School Datsun turbo kit....no wastegate at all, and all she can muster is 16 psi

 

Maybe I missed it some where but who's they? If it's then goodluck!

 

thegvr4kid [QUOTE]Either way I'd tell your Deep Throat top-secret operative deep inside the JDM scene from behind the walls of Super Street to take a hike

it seems that every time you reply to a post you are very negative, I guess your name says it all. it seems that the evo is the wrong car for you . with all the comments you write you should of bought an srt4. there you could bash each other. Grow up kid.

 

nice

 

you guys talk about compressure surge when running VTA, i've never had this problem

 

The company is Greddy, Trust in Japan. I got really lucky and got the whole package as long they use my car to test fit there product. They installed a 20g turbo, r spec intercooler. all pipeing excent the one that connects to the throttle body. still waiting on that part. that is why I do not have a blow off valve yet. down pipe. and exhaust. They were suppose to install the new emanage ultimat but waiting on a new harness, so I have the regular emanage installed. So far they got 350whp. I don't know what dyno they used. they used a dyno from gt motorsport. They said it was a very, very conservative tune. barely had to change the fuel maps because they said the computer was doing a fairly good job adjust to new turbo. I will post some pics this evening. got to go to work.

 

what r the advantages with the new Emanage?(asking b/c i had one in my old Evo)

 

what I have been told, new emanage. has datalog, set a/f ratio and do a couple passes and computer will try to get a/f setpoint. similar to exede. it uses wide band to do this. capable of removing airflow meter at the filter for higher hp cars similar to aem. uses actual crank angle sensor not feedback from oem computer to control timing and injectors. does not use oem injector signal like old emanage. will control timing and injectors not just bypass and send different signal. what I was told, will do just as much and more as stand alone and still have the drivability as oem. what I have read, others with full stand alone like the aem are haveing problems as soon as weather changes. with this set up you have all the features of stand alone and still have drivabitlity as oem.