Jerky with BOV
I have the leak stop kit as do many fellow dsm's and it works perfectly!
As for the fluttering most everybody is talking about, well that can be described as follows.
Put the car in 5th gear and attempt to go up an aggressive hill (average speed starting out would be around 60-70) using part throttle acceleration (not enough to build full boost, but enough to start spooling the turbo..
Then the "fluttering" begins...very annoying
Solution: Get the 1g valve and the leak stop kit..
As for the fluttering most everybody is talking about, well that can be described as follows.
Put the car in 5th gear and attempt to go up an aggressive hill (average speed starting out would be around 60-70) using part throttle acceleration (not enough to build full boost, but enough to start spooling the turbo..
Then the "fluttering" begins...very annoying
Solution: Get the 1g valve and the leak stop kit..
^^ Same thing.
1G = OEM MR BOV
Shocking news from the Dejon site.
"Due to quality issues, we no longer carry Greddy BOV's"
It works great till it stops working.
1G = OEM MR BOV
Shocking news from the Dejon site.
"Due to quality issues, we no longer carry Greddy BOV's"
It works great till it stops working.
Last edited by cfdfireman1; Feb 14, 2007 at 06:53 PM.
My MR BOV holds fairly well even at 27psi. I may end up trying the ForgeRS just to see if there is much of a difference.
But I don't see why you would need anything else at this point.
But I don't see why you would need anything else at this point.
Port 3?
If that's port 3 it MUST be pre throttle body.
Last edited by cfdfireman1; Feb 14, 2007 at 11:46 AM.
Newbie
Joined: Dec 2006
Posts: 12
Likes: 0
From: Redmond, WA
BOV's are a balance. If you weld it shut, it will hold boost really really well. Same the the 1G's and crushed 1G's, sure you can make them hold boost really well by putting very strong springs in them. You have to be careful the valve actually works still though, when you get -12 to -15 psi behind the throttle plate and +ve psi in the intake track, you need it to open. If you have a super hard spring, it's not going to open.
I wonder whats worse, removing the BOV altogether and getting compressor stall if you ever quickly let off the throttle (which is pretty rare) or having the fluttering which causes the car to buck violently happening all the time in high gears and hills?
Andy
I wonder whats worse, removing the BOV altogether and getting compressor stall if you ever quickly let off the throttle (which is pretty rare) or having the fluttering which causes the car to buck violently happening all the time in high gears and hills?
Andy
Ok, what I did was T off of the line I drilled and tapped that is going into the intercooler pipe for my boost controller...that is what caused the issue...or so I thought. I am having the same problem again with the high gear flutter/jerking issues...
Somehow this is related to the extreme cold. As the day I changed my MBC source back to the BOV line, it was 42 degrees out, and I had no problems....
Somehow this is related to the extreme cold. As the day I changed my MBC source back to the BOV line, it was 42 degrees out, and I had no problems....
Ok, what I did was T off of the line I drilled and tapped that is going into the intercooler pipe for my boost controller...that is what caused the issue...or so I thought. I am having the same problem again with the high gear flutter/jerking issues...
Somehow this is related to the extreme cold. As the day I changed my MBC source back to the BOV line, it was 42 degrees out, and I had no problems....
Somehow this is related to the extreme cold. As the day I changed my MBC source back to the BOV line, it was 42 degrees out, and I had no problems....
so I took of the bov return on the 1g (just to see if that would have any effect).
It had no effect on the flutter at 4-5th gear, but the car did not have any idle/stalling issues. Although it did go rich between shifts as usual. And damn a VTA bov is loud. Reminded me of the HKS days on the 2nd gen...
O, its recirculated now for those wondering...
It had no effect on the flutter at 4-5th gear, but the car did not have any idle/stalling issues. Although it did go rich between shifts as usual. And damn a VTA bov is loud. Reminded me of the HKS days on the 2nd gen...
O, its recirculated now for those wondering...
Newbie
Joined: Dec 2006
Posts: 12
Likes: 0
From: Redmond, WA
So I got my Forge Adjustable BOV - very nice unit, well made, nice in black. It was easy to fit the 34mm outlet version is the same size as the stock BOV, so it only took me a few minutes to plug it in.
Bad news is that it's no better than the stock IX BOV. Yes, it's very adjustable, it has *52* distinct 'clicks' that you can adjust it too. However, I tried lots of different positions from full soft to full hard and in all the positions, the stock IX BOV performed better in all situations. With this valve I saw for the first time what 'part throttle boost flutter' was, which means if you use anything other than full boost, the valve will flutter. In various positions it was almost undrivable as it fluttered so badly at even low boost and at other settings it fluttered badly at maximum boost. It's a shame, it's a nice part, you would have thought at some 'middle settings' it would be the same as the stock valve. The valve sounds different, it's a bit louder and there is often a slight whistle - which means to me it's not closing shut as well as the stock one does.
After a few hours of testing I went back to the stock metal IX BOV, in the end this still has low boost / throttle shut flutter, but I can live with this as it's less pronounced than with the forge.
I'm actually temped to try and experiment now I have two BOV's - I'm interested in putting them in series - one vertical from the UICP and one horizontal next to the turbo - in theory this might actually work well - one value may flutter and let a bit of pressure past, but this won't be enough to 'flutter' the second value. In theory if they both get the same vacuum from the intake, they should still work properly as BOV's just have no leaking or fluttering....
Andy
Bad news is that it's no better than the stock IX BOV. Yes, it's very adjustable, it has *52* distinct 'clicks' that you can adjust it too. However, I tried lots of different positions from full soft to full hard and in all the positions, the stock IX BOV performed better in all situations. With this valve I saw for the first time what 'part throttle boost flutter' was, which means if you use anything other than full boost, the valve will flutter. In various positions it was almost undrivable as it fluttered so badly at even low boost and at other settings it fluttered badly at maximum boost. It's a shame, it's a nice part, you would have thought at some 'middle settings' it would be the same as the stock valve. The valve sounds different, it's a bit louder and there is often a slight whistle - which means to me it's not closing shut as well as the stock one does.
After a few hours of testing I went back to the stock metal IX BOV, in the end this still has low boost / throttle shut flutter, but I can live with this as it's less pronounced than with the forge.
I'm actually temped to try and experiment now I have two BOV's - I'm interested in putting them in series - one vertical from the UICP and one horizontal next to the turbo - in theory this might actually work well - one value may flutter and let a bit of pressure past, but this won't be enough to 'flutter' the second value. In theory if they both get the same vacuum from the intake, they should still work properly as BOV's just have no leaking or fluttering....
Andy
no
So I got my Forge Adjustable BOV - very nice unit, well made, nice in black. It was easy to fit the 34mm outlet version is the same size as the stock BOV, so it only took me a few minutes to plug it in.
Bad news is that it's no better than the stock IX BOV. Yes, it's very adjustable, it has *52* distinct 'clicks' that you can adjust it too. However, I tried lots of different positions from full soft to full hard and in all the positions, the stock IX BOV performed better in all situations. With this valve I saw for the first time what 'part throttle boost flutter' was, which means if you use anything other than full boost, the valve will flutter. In various positions it was almost undrivable as it fluttered so badly at even low boost and at other settings it fluttered badly at maximum boost. It's a shame, it's a nice part, you would have thought at some 'middle settings' it would be the same as the stock valve. The valve sounds different, it's a bit louder and there is often a slight whistle - which means to me it's not closing shut as well as the stock one does.
After a few hours of testing I went back to the stock metal IX BOV, in the end this still has low boost / throttle shut flutter, but I can live with this as it's less pronounced than with the forge.
I'm actually temped to try and experiment now I have two BOV's - I'm interested in putting them in series - one vertical from the UICP and one horizontal next to the turbo - in theory this might actually work well - one value may flutter and let a bit of pressure past, but this won't be enough to 'flutter' the second value. In theory if they both get the same vacuum from the intake, they should still work properly as BOV's just have no leaking or fluttering....
Andy
Bad news is that it's no better than the stock IX BOV. Yes, it's very adjustable, it has *52* distinct 'clicks' that you can adjust it too. However, I tried lots of different positions from full soft to full hard and in all the positions, the stock IX BOV performed better in all situations. With this valve I saw for the first time what 'part throttle boost flutter' was, which means if you use anything other than full boost, the valve will flutter. In various positions it was almost undrivable as it fluttered so badly at even low boost and at other settings it fluttered badly at maximum boost. It's a shame, it's a nice part, you would have thought at some 'middle settings' it would be the same as the stock valve. The valve sounds different, it's a bit louder and there is often a slight whistle - which means to me it's not closing shut as well as the stock one does.
After a few hours of testing I went back to the stock metal IX BOV, in the end this still has low boost / throttle shut flutter, but I can live with this as it's less pronounced than with the forge.
I'm actually temped to try and experiment now I have two BOV's - I'm interested in putting them in series - one vertical from the UICP and one horizontal next to the turbo - in theory this might actually work well - one value may flutter and let a bit of pressure past, but this won't be enough to 'flutter' the second value. In theory if they both get the same vacuum from the intake, they should still work properly as BOV's just have no leaking or fluttering....
Andy
I found that hard to believe.
Ah.
Nice Ad for Dejon. Please re-read the thread, this has NOTHING to do with leaking air past the BOV at full boost. This is a problem with very low boost situations and fluttering. The Dejon fix only improves the 1G BOV in high boost situations. Air leaking past the BOV is not a big problem, it will get into the engine eventually anyway - this is only a problem if you don't recirculate (which is not a sensible thing to do anyway unless cool noises is more important to you than drivability).
Andy.
Andy.
No.
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