well, i have the hks super sequential bov for my evo. im ganna install it here soon. i was ganna put it on the same time as the emanage because it can stop the car from stalling because its an open atmosphere bov. but it looks as if im ganna have to wait a month or so on the emanage because of wiring issues. i want to go ahead and install the bov, is it likely the car will stall on me b/c its a maf? has anyone installed an open loop bov yet? i had a blitz super sound bov on my stealth, and it didnt stall ever, untill i got the greddy type s on, and it stalled almost every time i let off the gas. i think its because the greddy stays open at idle, and when you let off the gas. the hks ssqv stays closed, so in theory it should work like the blitz and not stall the car out. any input?

 

I believe that That WING240 has installed the HKS SSQV on his car without the recirc. adaptor, and he is not having any problems.

 

It wont stall, it should actually run just fine. I just installed a Greddy Type-S on an evo and it ran fine when we changed it over to run atmospherically. Maybe the ECU compensates?? It serious ran perfectly fine. I'm a perfectionist.....the slightest change in driveability and I would have put it back to the intake. The person I installed it for (TaiwanEvo) liked that sound so he wanted it venting.

 

y do recirculating blow off valves tend to cause problems?

 

Yea the Greddy Type S BOv venting to atmosphere runs fine at idle.. But in first gear, hitting 3k and letting go.. the car is a little shakey once it vents and stays in gear the car shakes a little.. Probably just time to switch gears.. And changing gear is a little sloppy also if you don't give it enough gas going to the next gear

 

Yeah, shouldnt have a problem with idle.. just after the blow off, the care will run rich for a bit.. It will effect shifting..


-Zach

 

Recirc'ed BOVs don't. It's those that are vented to atmosphere that might. The problem is that the MAF has already metered all the air that's being blown out of the intake tract when a BOV vents to atmo. The result is a rich mixture for some period of time after the blow off event.

Whether it causes driveability problems depends on a zillion factors. Sounds like we might be OK with a decent BOV on the EVO.

Thomas Dorris

 

im gana go ahead this wedsday and put it on, that is if my car isnt in the shop..

 

Hm, while we're on the topic, would it be safe to install a venting BOV w/o a SAFC to monitor or change the rich/lean fuel mixtures?

And if it is safe, are the Blitz or GReddy BOV's good to go? Since Claudius mentions the HKS BOV's tend to have problems...

 

Yes, it's perfectly safe. The change in mixture isnt so critical you need to adjust it back out. The Greddy Type S is probably the best for the evo because it's shaped identical to the stock one so you can recirculate easily. Just plugging the hole and turning the valve sideways you can vent to the atmos. I HIGHLY recommend a type-s. Make sure you get the Greddy Type-S 95-99 Eclipse Kit. It comes with everything you need.

 

wouldnt a Greddy typeR be a better bet in terms of flow for our high 20+ psi application? thats what im thinkin of gettin. no annowing woosy dolphin sound either.

 

yes, they type r is ganna be the better one for the evo. i was gana get that but decided on the hks because the rave reviews on it. the greddy type s will not hold much boost over 18psi.

 

I dont think you guys realize how huge the type-R is. I work with a lot with various BOV's on different cars. If you dont plan to go over 23 - 25 or so PSI, there's no need for the type R simply because of the inconvenience it is to install in the evo. It wont fit on stock piping because the diameter of the connections for the BOV are about twice the diameter of the type-S (with the exception of the flange, i think). You need a BOV dump tube that's basically shaped like a funnel if you want to recirculate...and that's if you can even fit the valve where the stock one is. With an aftermarket intake filter it's much easier.

They sell a kit somewhere were you can replace the spring in the type-s to handle even more boost. Before you go the type-r route, it may be better just to go with the HKS valve (i think it handles more than the type-s). Mitsu cuts it real close and the type-s barely fits in there because of the manifold and radiator hose. I'm not saving it cant be done, because I can think of ways to do it. You'd likely have to relocate the type-r (like behind the batt or next to an aftermarket intake) and vent to the atmosephere. I guess thats a way to do it, but i dont know where you'd stick it in without hitting the hood. Maybe attached sideways under the swaybar.

Here's a pic:


I can vouch though....the type-r sounds sick......just absolutely SICK. No whistle sound....just a super loud whoosh. Like a small afterburner. That's not to say the type-S sounds bad. Just ask TaiwanEvo (i installed that one), it sounds awesome and REALLY loud.

Regards,
Rob

 

BTW, if you are interested in a type-R. I found one selling really cheap (JDM spec TRUST brand)

http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

and here

http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

Notice from the pic how big the valve is. It's nearlyt bigger than the guys whole hand! HAHAH.