WORKS Diverter Valve - 2008+ EVO X



The WORKS Diverter Valve is an OEM-style unit featuring all-metal construction (except internal diaphragm). The DV utilizes a unique internal design to balance maximum boost pressure regulation while maintaining excellent drivability. Special fastening hardware ensures a superior airtight seal.

Holds upwards of 30psi (when properly installed) and since 100% of the discharged boost pressure is returned back to the intake, the WORKS DV ensures the best performance possible.

You cannot get a better EVO X valve for performance, reliability and daily drivability.

Application: '08 EVO X including GSR and MR

QUESTION

ANSWER

This is a good option for people who want to upgrade their BOV due to running higher PSI on various turbos.

I say this is probably the best option for a recirc valve if you want to upgrade. Too many of these BOV cause a CEL to come on.

Just sharing some knowledge.

 

Thanks for the info.

I'd planned on getting one of these at some point, but it looks as though now is the time. I discovered just last night my *stock* Bypass Value is leaking boost pretty bad. I had initially assumed there was a leak somewhere in the plumbing, but after tightening everything down and even replacing a few of the T-bolts and one of the couplers, the BPV was the only thing left that could be responsible. I tested it last night by reversing the BPV (effectively making it a PULL-type valve) and viola, no more angry tea kettle.

Before I drop money on the WORKS valve I'm going to look into maybe just swapping the stock spring out for something stiffer. We'll see...

 

Same as Tomie BOV and it won't hold 30psi.

 

Any advice on a DV that will hold 30 psi and not throw a p1241 code?

 

Stock one...I am above 30 and no codes from it.

 

I'm assuming that us 08-09 Ralliart owners can purchase this as well, seeings how the stock BOV is interchangable.

Yes? No?

 

Don't mistake 30 psi peak and holding.

Some stock bov's (they are all over the place) can allow a 30psi peak but will not be able to sustain it. Some won't even allow 30psi peak.

Slightly crushing it helps a ton.

 

Yes. Same as stock Evo 9/10 Bov

 

Yea I wasn't referring to holding 30psi, but I don't know if I have seen anyone running(holding) 30psi at redline even with an upgraded turbo on the X yet.

Regardless, the stock unit is pretty capable, and I have heard good things about slightly crushing it, on the 9's anyway.

I assume you would be able to see if you were leaking boost on the dyno yes? Like your boost graph would be all jagged or just crap out and the power graph would represent this as well?

 

Leaking at peak boost you can usually see from a Wideband log (more from the downpipe and not tailpipe) as a rich dip right at peak boost.

I can post some screenshots.

On my personal evo, many moons ago, I had it tuned at 29psi peak but couldn't tune out a rich spot at peak boost. So out of curiosity, I crushed my Bov and went out for a log. The car hit 34psi before I let off (I had error correction off for this) with no other changes at all. So same WGDC, same everything. I tuned it back down to my target 29psi and the rich spot also went away.

Usually you can't see BOV leaks in power curves unless they are extreme.

I've had some great gains on the 9's from crushing bov's when trying to max out the stock turbos on E85. I had one 9 gain 40whp/40whp in the midrange from crushing the bov and no other changes.

I had a Evo 8 with a 35R gain 50whp up top from changing to a bov that wouldn't leak with 30psi sustained to fuel cutoff.