Blow off valve testing, it really works!
http://cgi.ebay.com/ebaymotors/ELECT...spagenameZWDVW
It's on a website somewhere! It MUST WORK!
We have run tests on the single spring and it causes more idle trouble and boostleaks than anything.
You defend the mod like it was your idea. If it was, I would smack you for such idiocracy.
It's on a website somewhere! It MUST WORK!
We have run tests on the single spring and it causes more idle trouble and boostleaks than anything.
You defend the mod like it was your idea. If it was, I would smack you for such idiocracy.
How could changing the spring rate of a diverter valve cause a boost leak unless the valve is not reassembled correctly? A boost leak means you’re losing boost to the atmosphere. Are you recirculating or vta? I’ve used the mod and it works fine at over 30 psi. The fact is that the area of the valve that is moved by the reference from the intake manifold, the diaphragm, is much larger than the area of the valve that is pushed open by boost at the bottom. The valve will hold boost without a spring in it. Same pressure 2 different size areas, the larger area will have more force, simple physics.
It’s just too bad the diaphragm is a p.o.s. and fails or I would still be using the GReddy valve.
It’s just too bad the diaphragm is a p.o.s. and fails or I would still be using the GReddy valve.
So what you are saying is that you are making recommendations on a valve that you do not even use. NICE.
I have personally used this valve AND STILL DO for 22 months. I boost 33psi daily and I do it using the correct method of both springs AS GREDDY ENGINEERED IT TO USE.
I have personally used this valve AND STILL DO for 22 months. I boost 33psi daily and I do it using the correct method of both springs AS GREDDY ENGINEERED IT TO USE.
Go Ahead.
Well smack me. I have used the GReddy and I’m using it again modified to remove the diaphragm. The 1 spring mod works and the valve is slightly opened at idle just like a stock valve. GReddy engineered the valve as a blow off valve, as in vent to atmosphere and that’s not how most EVO owners use it. The stock valve is slightly open at idle and so is the GReddy with the 1 spring mod.
Last edited by cfdfireman1; Aug 30, 2006 at 06:19 PM. Reason: new info
I'll be the guy that brings this back to life... I'm interested in the 1 vs 2 spring debate as I am using the larger spring and have idle issues but love the driveability. I suffer no surge on the track and just a little on occasion if street driving.
Tested - couldn't find one. However I have seen dynamic leaks appear that wouldn't appear under static conditions.
Also, I have a BBK Full and wondered if maybe it didn't hold 27psi all the way too redline, although I hope it would.
Also, I have a BBK Full and wondered if maybe it didn't hold 27psi all the way too redline, although I hope it would.
I don't know if this matteers but I did not plug the little pin hole that come plug on the casing of the RS. I figured it's there for a reason but I guess by the same token, I shouldn't have removed the smaller spring 
Let's see here Forge makes 4 springs to chose from. 
Tial makes I don't know how many different springs.
So why is it that the GReddy needs the 2 that came with it when it was designed originally to run VTA?
Tial makes I don't know how many different springs.
So why is it that the GReddy needs the 2 that came with it when it was designed originally to run VTA?
I'm not sure it does - that's what much of the discussion in this thread is about. There are a few threads in which people have discussed using just the larger spring or both - perhaps it's because of one or both being for VTA vs recirc? I'm interested in what others have to say.
heres what I noticed going to the single spring mod and back. I am VTA
With the single spring mod, my freeway cruising was awesome. I got absolutely no compressor surge, held boost well, and I could release rapidly from any amount of boost and it would actuate extremely quick. BUT, my city cruising SUCKED in my lower gears, surging like hell and dropping my RPM way low at stop lights/clutch engagements.
But with BOTH springs in, it was the complete oppsosite. Still get the infamous RPM drop, but not nearly as bad as with the single spring. Freeway driving is a little sketcy with a fair amount of compressor surge when releasing from small amounts of boost, making quick CHEE CHEE CHEE sounds when the valve doesnt open enough.
would recirculating it work with the single spring to make normal driving good?
Im going to a stock 9 bov here shortly.
With the single spring mod, my freeway cruising was awesome. I got absolutely no compressor surge, held boost well, and I could release rapidly from any amount of boost and it would actuate extremely quick. BUT, my city cruising SUCKED in my lower gears, surging like hell and dropping my RPM way low at stop lights/clutch engagements.
But with BOTH springs in, it was the complete oppsosite. Still get the infamous RPM drop, but not nearly as bad as with the single spring. Freeway driving is a little sketcy with a fair amount of compressor surge when releasing from small amounts of boost, making quick CHEE CHEE CHEE sounds when the valve doesnt open enough.
would recirculating it work with the single spring to make normal driving good?
Im going to a stock 9 bov here shortly.
^^ Normal driving is great with the larger spring - it's equal to the stock 9 or jdm 8 with dejon mod. The issues I'm encountering are poor idle (though I have Kelford cams) and 3psi taper on the track over 6k RPM.
I'm not sure if the issues are related but I have learned the BOV can be the culprit to both good and bad behavior.
I'm not sure if the issues are related but I have learned the BOV can be the culprit to both good and bad behavior.