Blow-off Valves
 

What is the difference between The Greddy Type S, Type RS, and Type R Blow-off valves? Thanks

Each one is made for different boost levels. The Type S is the "regular" BOV & has a 37 mm vent opening. The Type RS is new, and has a 40 mm opening. The Type R is pretty much for extremely hi-boost applications. Since most of our kits are running under 10 lbs. of boost, the Type S is more than adequate.

also, type S sounds louder than RS :P

Our cars should definately NOT use atmospheric blow off valves (in fact, most cars shouldn't other than older cars and things like turbo hondas).

We should have recirculating BOVs.

Either way its a pain in the ass to install in our car cuz you have to weld it in - leave it to the professionals and let them pick the right one for you unless you're dead set on doing it yourself.

If you don't plan to see more than 15 psi you should be fine with any BOV on the market.

Is there a benefit to having a recirculating BOV with the Greddy turbo ?

OK

If you are running an atmospheric blow off valve, when it PSSSHES its going to screw up computer readings because the pressure is going to mysteriously vanish, your computer won't know what to do.

If you recirculate, it'll just go back into the pipes and there won't be a crazy drop in pressure.

The reason you want a blow off valve in any case is because when the throttle body closes, its like all that pressed air slams into a wall, and what's it gonna do? Go back and smash into your turbo, killing the life of the compressor wheel.

I have to decide on either the type S or RS. Which one will work better with the Greddy kit boosting about 9 or 10 psi? Will there be any difference between the two bovs?

Thanks,
Jamie

did you bother to read the thread?

You're going to get stalling everytime you shift if you use them.

So do you not have a blow off valve of any sorts? I take it yours doesnt make the whosh noice then right? I read the thread but it seems like everyone with these kits has a BOV on it and they all look to be in the same place. Just wasn't sure about it that's all.

Jamie

I have the type S on my car & it works fine (non-recirculating). You just have to play with the adjustments. Some people had it too "soft" & hardened it. For me it was too hard, & I softened it. You have to adjust it a bit & it will work fine. You can use either the Type S or RS, they are both fine. We are running such low boost on our cars it doesn't really matter. It is not like we are at 20-30 psi like some of the Evo's where the BOV will make a big difference.

Where and how did you put the BOV on the kit?

You put it on the intake pipe (the one that goes into the engine). You get the BOV & the mounting kit (essentially a metal that fits on a flange), then you take that pipe to any welder & get a hole & weld a flange into it, so that the BOV mounts up to it.

Ok that's what I thought, just wanted to make sure that's how everyone was doing it. Why doesnt the kit come with a bov to begin with? Does it not have anyway of releasing pressure?

I've found two different mounting flanges for the bovs, an aluminum flange adapter and a Steel Weld-On Flange. Which one do I need?

Thanks,
Jamie

depends on the material that the pipe you are going to mount the BOV to. if you have a steel pipe, use the steel flange. if the pipe is aluminum, then go with the aluminum.

welding steel to aluminum is pretty near impossible. a friend a few years ago had a turbo on his civic, and the piping was steel, and he got the greddy BOV with aluminum flange. he cut his hole and had his buddy weld on the flange, but after they got it tacked down and turned the pipe to complete the welds, when they rolled the pipe to weld it, the thing would just pop right off.

I know that it matter which material you use, but what metal is the pipe in the Greddy kit made of that you mount the bov to?

aluminum

ahhh, sorry.

not 100% sure on the greddy kit, but i would assume that the piping is aluminum, as it doesnt need to withstand high heat and or intense pressure.

Ok thanks, just making sure before I buy one.

wait... i thought the greddy kit came with a BOV?

nope

reviving fromt the dead... if you have a greddy bov welded on can you still change it or are you stuck with that bov?

you weld on a flange... a greddy flange will accept greddy BOVs

they also make adapters to switch between certain BOV brands, so if I wanted to switch my Greddy to HKS I could do that using an adapter