Road Course: Part throttle drivabilitly
It has been my personal experience that the BOV is usually to blame.
We have been gobbling up all the available APS Twin Vents that we can find to use on the race cars. They can hold tons of boost and handle part throttle with no issues.
Depending on your boost levels, the IX BOV is a really good option. Much more reliable than most aftermarket ones and really cheap (~$90-$100).
We have been gobbling up all the available APS Twin Vents that we can find to use on the race cars. They can hold tons of boost and handle part throttle with no issues.
Depending on your boost levels, the IX BOV is a really good option. Much more reliable than most aftermarket ones and really cheap (~$90-$100).
I don't know anyone who has converted to SD for track purposes and complains about it. I had terrible part throttle surge; the car would buck really badly. I tried almost everything, even went through 3 different bov to rid of it. Nothing worked. I finally got my tuner to convert to SD, and all of the surging and bucking went away. It was night and day difference for track and dd. I have had several evo owners drive my car on track and they have all been impressed. Alwaysinboost purposely tried to make it surge in areas his car normally would, and nothing. I would never go back to MAF again. That's just how strongly I feel about SD.
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Joined: Aug 2008
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From: Atlanta, GA
It has been my personal experience that the BOV is usually to blame.
We have been gobbling up all the available APS Twin Vents that we can find to use on the race cars. They can hold tons of boost and handle part throttle with no issues.
Depending on your boost levels, the IX BOV is a really good option. Much more reliable than most aftermarket ones and really cheap (~$90-$100).
We have been gobbling up all the available APS Twin Vents that we can find to use on the race cars. They can hold tons of boost and handle part throttle with no issues.
Depending on your boost levels, the IX BOV is a really good option. Much more reliable than most aftermarket ones and really cheap (~$90-$100).
DONT CRUSH IT!!!!
your trying to fix your part throttle flutter, not make it worse. crushing it to preload the spring makes the flutter worse. you want to soften the spring as much as possible. the 9 BOV works so well because it has a soft spring. the forge DV has a softer spring option (comes with the medium one by default). change out the spring in the forge to the soft one, or use the 9 BOV WITHOUT CRUSHING IT.
your trying to fix your part throttle flutter, not make it worse. crushing it to preload the spring makes the flutter worse. you want to soften the spring as much as possible. the 9 BOV works so well because it has a soft spring. the forge DV has a softer spring option (comes with the medium one by default). change out the spring in the forge to the soft one, or use the 9 BOV WITHOUT CRUSHING IT.
I ran a crushed 9 bov on a bbkfull/2.0 at 24psi on track with no issues. A friend of mine has the aps on a maf car and i despise thesay it drives. I now run a synapse and it is butter. Super smooth driveability with zero flutter anywhere.
It has been my personal experience that the BOV is usually to blame.
We have been gobbling up all the available APS Twin Vents that we can find to use on the race cars. They can hold tons of boost and handle part throttle with no issues.
Depending on your boost levels, the IX BOV is a really good option. Much more reliable than most aftermarket ones and really cheap (~$90-$100).
We have been gobbling up all the available APS Twin Vents that we can find to use on the race cars. They can hold tons of boost and handle part throttle with no issues.
Depending on your boost levels, the IX BOV is a really good option. Much more reliable than most aftermarket ones and really cheap (~$90-$100).
I love my APS TwinVent. No flutter on the stock turbo or the 5857turbo.
Thread Starter
Evolved Member
Joined: Aug 2008
Posts: 785
Likes: 3
From: Atlanta, GA
DONT CRUSH IT!!!!
your trying to fix your part throttle flutter, not make it worse. crushing it to preload the spring makes the flutter worse. you want to soften the spring as much as possible. the 9 BOV works so well because it has a soft spring. the forge DV has a softer spring option (comes with the medium one by default). change out the spring in the forge to the soft one, or use the 9 BOV WITHOUT CRUSHING IT.
your trying to fix your part throttle flutter, not make it worse. crushing it to preload the spring makes the flutter worse. you want to soften the spring as much as possible. the 9 BOV works so well because it has a soft spring. the forge DV has a softer spring option (comes with the medium one by default). change out the spring in the forge to the soft one, or use the 9 BOV WITHOUT CRUSHING IT.
Thread Starter
Evolved Member
Joined: Aug 2008
Posts: 785
Likes: 3
From: Atlanta, GA
Just curious based off Kevin's response on the reasoning for crushing the unit.
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Joined: Aug 2008
Posts: 785
Likes: 3
From: Atlanta, GA
Just curious has any used a coil on plug setup? I was just surfing around and saw Spoolin' Up advertise that there COP setup reduces part throttle surge. Reading that got me interested in correcting my issue and starting this topic. Has anyone converted their track car to COP? Or is it just overkill for my sub 350hp evo?
i run a sparktech and stock 9 DV. i have only run into flutter on or two occasions on the same turn at the same track. it is a right hand sweeper taken in 4th gear, a few times i have had to lift a tiny bit and gotten it to flutter until i went wot again.
i have only tracked on the COP and not stock coils. i can say however that my around town driveability had a noticeable positive change from adding the COP.
i have only tracked on the COP and not stock coils. i can say however that my around town driveability had a noticeable positive change from adding the COP.
Most of that is from the divertor valve. Swap on the Stock IX metal divertor and it will be fixed. Forge and Forge Evo DV are well known to have part throttle drivability issues. I had this issue using a Forge DV back in the day.
Once that is done then get the beast tuned. Or I will help you tune it since you have a WB. We will use the Tephra Mod v7 for the IX.
Regarding your question on the COP...usually helps under conditions where the stock system is weak or has issues. Like at 7K and not enough time to fire thru 24 psi. Might help you in that regards. If the stock system is in good shape ( wires coils plugs ) it is fine up to about 350 whp. COP will allow you to open the gap a bit on the plugs. If you do not have miss issues at high rpm or off idle or at peak boost then maybe not much help.
Best regards,
Milburn
Last edited by WRC-LVR; Apr 23, 2013 at 03:22 PM.
i run a sparktech and stock 9 DV. i have only run into flutter on or two occasions on the same turn at the same track. it is a right hand sweeper taken in 4th gear, a few times i have had to lift a tiny bit and gotten it to flutter until i went wot again.
i have only tracked on the COP and not stock coils. i can say however that my around town driveability had a noticeable positive change from adding the COP.
i have only tracked on the COP and not stock coils. i can say however that my around town driveability had a noticeable positive change from adding the COP.
Last edited by WRC-LVR; Apr 23, 2013 at 05:52 PM.