To all rotor heads. If your planning on buying a Tial BOV for your RX7 it is very important that you know what to ask for. The BOV comes with two different spring rates. The softer of the two should be used on the rotory. Because The stiffer spring is made for engines producing 20 Vacume or more to open faster and so not to have compressor surge. The softer spring works better with for example THE ROTARY because it sees 15-17 vacume at idle so in that case a softer spring will allow it to open sooner, not affecting the performance of the BOV. I found this out because I was getting compressor surge just by letting off the throttle a little bit. Also the BOV was opening late(on a 2 sec delay) I hope this educates drivers out there. I hate to see people waste there money or be taken advantage of.

REV HARD!!!!!

 

cheers for that i was looking at their bov's

 

Let me ask you this, I know this has nothing to do with performance but how loud is your tial bov??

 

The sound is noticable. Its makes a swoooosh sound

 

Ok.. cool.. just wondering if it had a noticable sound or not.

 

Can anyone explain what a compressor surge sounds like? "Coolrotaries" had just about the same problem as I do. There is a weird sound (like...voop...voop.voop) and the BOV opens up. The thing is, the Blitz BOV was working fine with the stock set up. After installing the front mount IC, I hear this weird noise when I lift off the throttle ( part and full) then a late blow off from the BOV. When I had the stocj set up, the BOV was quick when I lift off. I get mixed responses when I talked to the speed shops here. Some say that I should feel it when I lift off like a fuel cut. Anyone has experiences?

 

My RX6 turbo sounded like the freakin' three stooges when I was running it without a BOV -- let off the gas and wub-ub-ub-ub-ub.

I put a TiAL on there but I don't know which spring I got. It seems to work fine (no more stooges) so I am happy. It is pretty quiet as BOVs go, but you can definitely hear it. It doesn't make weird bird noises or anything - just a slight pop and then air rushing.

-Max

 

Like the HKS SS?

 

compressor surge is sometimes a "bub-ub-ub-ub" sound or a "cho-cho-cho" sound. here is an example of how the "cho-cho-cho" compressor surge sounds like (but damn...it does sound cool. . but not good for the turbo(s) whatsoever):

http://neil.f-dup.net/Cory-BOV.WMV

http://neil.f-dup.net/Cory-BOV3.WMV

 

cho cho cho....whubba whubba AHAHA it's always fun to see how people interpret sounds.

My take is that it's more of a ch ch ch ch ch sound....but then again it depends what turbo and the filter element etc....but bad no likey surgey

 

Right on MAX! Same here till i got my Blitz bov.

 

how many pounds of boost can you run the the two different spring rates?

 

Hmm, my tial sounds the same. Compresser surge or just the way that bov
sounds? I'm running a 62-1.

 

is this with the older 34/40mm sizes or the newer desings 38/45mm ?? i've run the older desing for years on a few rotaries and never come across this issue, but I always ordered the .45bar spring..

 

BOV, not wastegate.

-Max

 

Yeah, those 2 vids are definitely surge!! My Tial just goes "pssssshhhh!" Nothing else.

 

oops my bad, thinking about one thing.. looking at another. I use R2D2''s or SSQV's.. but good info regardless..

 

How can you tell from one spring to the other?