I've read quite a number of posts about rerouting BOVs and seems that most of you guys prefer it this way.

I'm very new to the forced induction camp and have nothing to compare my atmospheric BOV to. What I do notice is that the BOV flutters when i release at part throttle (i think fluttering means Shss shh shh shh instead of one loud SHHH when I release the throttle? or does it occur on boost?). Does the fluttering BOV affect throttle response, power or anything? I would be running 2 settings 1 at 18psi and another at 25 psi

According to this from Evo modding for dummies,

Diverter Valve/ Blow Off Valve (DV/BOV):

Do yourself a favor; kill the ricer within you now. Evos do not respond well to BOVs. Especially if they vent 100% atmospherically. The stock IX diverter valve (aka JDM MR diverter valve) is a very capable and inexpensive solution. The IX diverter is metal and can handle 25 psi without any issue. You will experience very limited, if any drive ability issues. Partial throttle situations will be manageable and not violent.

- If you have an VIII, do yourself a favor and get a IX diverter valve.
- Don't be a ricer, unless you have an aftermarket ecu then stick with a recirculated diverter.
- Aftermarket diverters tend to have partial throttle issues and will never be as daily driving friendly as the stock IX diverter.

What are the partial throttle issues?
I'm using a HKS racing single valve BOV. Should I try to recirculate it or use my stock JDM Evo IX GT valve?
I don't have an aftermarket ECU and have my ECU reflashed with ECUTECH. I wana make sure I get all my hardware right before I send in the car for a retune.

Any advice is greatly appreciated.

 

go back to stock.

 

Any explanation to that? Would recirculating the BOV be an option for me? I would also consider the option of buying an APS BOV but would not waste that extra hard earned cash if getting a recirculating system for my current BOV is also just as effective.

 

yes man you will need to recirculate it again if you wnat it to ever drive right. then I suggest the synapse BOV for it did wonders for me. Good luck


S

 

dont listen to anyone... its still good... its wont really affect your car as bad as everyone says it will... other than running a lil rich... your tuner can compensate for it in the tune itself

 

Even if its just an ecu reflash and leaving it still venting to atmosphere?

 

The synapse never did came across my mind because I do not have a local distributor whereas someone did bring in the APS. I'll read up about it, thanks.

 

i just went from the forge recirc to the ix diverter and the car drives so much better

 

***

 

depends on how the flash is set up... lol to many variables play into its not just a one time flash and your done..

like i said jus keep it

 

Does it have any issues running 25-30psi?

 

dont know yet i only run 20 currently but within the next week im putting a ix turbo and tubular mnanfolf on and turning up the boost

 

Thanks for the reassurance. By the way, what do u guys mean by fluttering? Does it occur when u are on boost or when u release the throttle.

 

when your on partial throttle... itll sound like a "ufo" or something... lol completely normal , bro

 

Lots of local guys where I live fried their 9 turbos in the circuit which prompted me to get an upgrade. Not sure if we're talking about the same magnesium turbo here as all our Evos in Singapore are JDM. Anyway best of luck to your new turbo.: