This is my first real post so be gentle

Ive been watching Japanese Touge for years and my first real encounter of an rx7 was the pink re-amemeiya look a like and the pink abflug beast. What i wanted to know was what Dump valves do the touge guys run like the grey feed fd?? They are recirculating which i want but i can only find an HKS ssqv bov which says it recirculates..are there any others that the touge masters use solely?? I cant stand the atmospheric valves had one before and thay sound cheap and nasty imo.

Ive just got my fd and want to stick with its home roots for styling and performance.

Thanks

 

You can recirculate a greddy

 

i think you can re-circ the synapse

 

I've not heard of a re circulating bov before. Is the idea to keep up some of the pressure between shifts??

 

It reduces the noise. On a MAF-based car recirculating the BOV helps maintain driveability. A fully vented BOV can confuse the MAF sensor and cause a lot of backfiring and sometimes even stalling. There are also hybrid "50/50" blowoff valves that recirculate under lower load/boost and then start dumping to atmosphere at higher load/boost.

 

I googl'ed it right after I posted it.

It also mentioned you can get a slight performance increase in terms of spool up time.

I imagine it would not be worth the effort, if one was running sequential twins right? My boost seems pretty quick now.....

 

recirculating is when the valve puts the air back into the boost system so that you dont get the pressure lost between gearchanges. It helps the life of the turbo and sounds beauuuutiful thanks for your help guys anymore with info????

 

Bosch 110 Bypass valve from a Porsche 993. Flows great (good for 30psi), and damn near silent.

 

recirculating bov's are vitually silent on lift off due to it being a closed system and fd's as stock come with the bov's piped back into the intake, hence, recirculating.

The chatter heard on most cars on the bmi/hot version/touge videos are running without a bov and what you are hearing is mostly compressor surge( the air pushing back over the compressor blades).When i was at Re-A the white track car was plugged where the bov would go!.Also the feed fd is running a cutback TO4R and again NO BOV the noise heard on lift off is compressor surge/wastegate chatter etc etc.

There are a million views on the bov/no bov opinion, i personally found better throttle response without the bov and ran my stock twins like that for over 2 years. They are still going strong but the chatter grew tiresome after a while so i bought an R2D2.

 

you can recirculate the HKS ssqv too...its an insert that you buy separately...for some car specific kits it comes with it, like the ones that we install on the GTRs

 

You will still hear it a little bit if you recirculate unless you have a bone stock intake system.

 

Totally agree! it can still be heard but with the OP stating the sound is "awesome" then this usually relates to the chatter heard from high power singles.

 

i think its the compressor surge on the bigger single turbos. to my knowledge compressor surge is a bad thing and i thought that the touge guys would try to eliminate this to save their turbos. I just love that chatter sound on low boost haha big kid at heart!

 

https://www.rx7club.com/single-turbo-rx-7s-23/8-months-counting-no-blowoff-valve-884695/