If the Greddy kit is bolt-on why does it not enclude a BOV?

Because the sound of compressor surge is COOL? Probably not. I just don't understand. Mabye so that you can run whatever bov you like? $6500 is enough, it should come with everything! If I get this kit and it's missing a single bolt I'll be sending a bill to greddy.

Anyone have an explination?

 

BOV are not really needed when running only 5.7psi of boost. If you get one you better get a welder to weld the flang were ever your going to put it. To me its just another place were boost could leak

 

Typically you loose any chance of passing emmissions when you put a blow off valve on a car that uses a MAF or AFM. This is because air that is already metered is being evacuated, causing a massive rich spike when the BOV is open. The ECU is injecting fuel for air that is no longer in the charge.

This is what causes those flames out of the exhaust on the shift you see in some cars. Its unburnt fuel burning in the exhaust. It will destroy your cats in short order as well.

HOWEVER with the 350Z using a Greddy kit... Since Greddy has put the MAF in the charge pipes, you could possibly get away with not having these rich spikes if you put the BOV on a pipe before the air gets to the MAF. Never tried this on this type of setup. Its not common to boost thru a MAF.

-Charles

 

The ATI Procharger boosts through the MAF. Works fine.

 

"BOV are not really needed when running only 5.7psi of boost. If you get one you better get a welder to weld the flang were ever your going to put it. To me its just another place were boost could leak "

I totally disagree. The Mitsu 18g turbos are not cheap. Not using a BOV is going to cause premature wear. Six psi isn't a lot, but it's still going to cause problems if you let of the throttle quickly.

My point is the greddy kit is NOT a blot on kit. A BOV is a required component of a turbosystem, unless you really don't care about the life of your turbos. Also that compressor surge is going to make the turbos take longer to spool up. It's just a stupid move on Greddy's part if you ask me. Mabye I will get the Vortech kit. I dunno...

 

So far I think all the FI kits for the 350z are, much like the IS300 systems. I wasnt saying its never done, just saying its not common overall... didnt mean specifically in this community.

-Charles

 

etx: you are over reacting about the kit. the BOV or not should be the last decision you make in purchasing a system.

Lots of people dont like the BOV sound, or just dont care. The longevity of the turbos is not that big of a deal... cause i promise you will blow your motor long before those turbos go from not having a blow off valve.

initial spoolup is not effected by a BOV, however when you shift you will loose compressor instantly without one.

Either way, it wouldnt ever be CARB exempt with a BOV, and most of the turbo kits Greddy does they try and get CARB certified. That is probably the #1 reason why they dont have a BOV on it. Not only that, but if it DID come with a BOV, everyone would be complaining that it doesnt come with the BOV that they want. Lots of tuners have a preference, and they dont want to buy a BOV that they dont want to use. If it means a lot to you, simply install one. If you sent me a pipe and a flange I could perfectly TIG weld it for you for $40 + return shipping.

-Charles

 

I used a TD05 18g on my turbo eclipse for 50k miles with no BOV and the turbo kept going after I got rid of it. If you also look at most race cars there are no BOV. busher racing does not use them on there talons. Its not needed. I would be a little more concern about fuel management with this car then a BOV . Yes this is a bolt on kit, as in you can install it with no other mods and it will work just fine

 

you realize there was a time, not very long ago, where turbo cars had no BOV's, right? The higher the boost, the more a BOV is needed.....at 5.7 psi of boost though, its not needed, though we advise it anyway

Not to mention that AFAIR, no Greddy kits include the BOV's

 

If greddy kit include the BOV, it will not pass CARB exempt. Then their kit will not be legal on the street of California. Then they will lose attraction to some consumers. Buying a CARB legal kit is very important to some people. So, they left it out and let you decide if you need one or not.

 

A blowoff valve vents the intake (post turbo, but pre-throttle) to amosphere, correct? If this venting occurred before the MAF, why would that affect emmisions? Is there a way to pipe the vented air into the exhaust so prevent any emmisions problems, or is that just too complicated accomplish feasibly?

-D'oh!

 

you could pipe the air back into the intake if you wanted too, but like I said, at the boost we are running why spend the extra money when you don't need it.

 

Just about every stock turbo car I can think of has a bov stock. If you don't like the sound of it then vent it back to the intake like a stock setup. If the bov is before the MAF sensor it should not cause a rich condition and cause the carb test falure.

I could see an all out race car with an auto drag tranny not having a bov. That makes since because the throttle plate most likely only closes at the end of a run.

You don't NEED in intercooler, but it is nice to have right? A turbosystem I not healthy without a a bov. But that's just my opinion.

 

Well its an easy fix then... if it means so much to ya, just add one.

Like I said... some people have a BOV preference anyway... if Greddy supplied one then everyone would complain that they dont wanna pay money for the BOV if they dont need it or if they want a different one...

I dont understand what the big deal is... get a BOV if you want a BOV.

 

Stock turbo systems typically run much more than 5.7psi. If GReddy's kit was boosting 10+ psi, I'm sure they would have included a BOV. This system is perfectly capable without a BOV, whether you think so or not.

The fact is, you don't need one. Like phunk said, though.. if you're worried about it, go buy one to ease your mind.. it can't hurt.

 

exactly

 

when i ordered my kit i ordered the bov....i feel bov and boost controlers and larger intercoolers are all stuff to optimize the use of the turbo kit........its like nitrous....you dont need the bottle heaters but they make the nitrous hit better....PLUS IT SOUNDS COOL!!!

 

Its all stuff that if not tuned properly could cause a lot of damage in the wrong hands. After reading a lot of your post and if I was a tuner for your car I would have never given you the options of a boost controller. I am really scared for your car man!!!!! Be Safe and don't play to much with it.

 

Same here.

 

I might not know alot about cars, and i might now own a shop, but excuase me for wanting to see how much boost the internals can hold. I never said im doing the work my self......i go with 12secZ in that if i did the work myself instead of paying people to do it, i would be rich.....but i like to see how far i can push the limits and im sick of being flamed for trying to push the barrier.