New Forge RS BOV
Originally Posted by Mike@Forge
The spring in the RS Valve took us 15 weeks to develop.
It's a conical, progressive rate spring that is adjustable from 7 to 34 PSI.
They are all individually cold-wound. A process proven to prevent sagging or relaxing of the spring tension regardless of pre-load or length of use.
It's a conical, progressive rate spring that is adjustable from 7 to 34 PSI.
They are all individually cold-wound. A process proven to prevent sagging or relaxing of the spring tension regardless of pre-load or length of use.
Tony
Read my post at the bottom of the first page of this thread.
https://www.evolutionm.net/forums/sh...8&postcount=15
The "fluttering" felt with the older valve IS NOT "surging".
Surging would imply that the valve is not opening fully to allow the flow of air required causing the residual pressure to slow the spool of the turbo and increase lag. This is usually experienced when the valve is adjusted too tight or if no valve is used at all.
With the older valve, surging is not what is being felt.
Fluttering is what is being felt due to the movement of the piston/diaphragm of the valve in relation to the inconsistent pressure differential between the bottom(pressure) side of the valve and the top(vacuum) side of the valve during throttle modulation.
There is a delay between when the vacuum line will have the same amount of pressure or vaccum as the hard pipe connected to the bottom of the valve. This creates the fluttering concern at throttle modualation.
This feeling is exacerbated by the design of the older valve's piston. We experimented with different designs and were unable to create a piston that performed effectively within the older valve's body.
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To make a long story short....
Yes, the new RS valve has almost completely eliminated the fluttering concerns.
We have changed the design of the piston, incorporated the highest possible flowing ports and internal valve bore, and have used a spring design that can be precisely adjusted to each application.
A very slight amount of fluttering will still exsist, but only at part throttle due to the modulation of the throttle and the above mentioned pressure differential.
https://www.evolutionm.net/forums/sh...8&postcount=15
The "fluttering" felt with the older valve IS NOT "surging".
Surging would imply that the valve is not opening fully to allow the flow of air required causing the residual pressure to slow the spool of the turbo and increase lag. This is usually experienced when the valve is adjusted too tight or if no valve is used at all.
With the older valve, surging is not what is being felt.
Fluttering is what is being felt due to the movement of the piston/diaphragm of the valve in relation to the inconsistent pressure differential between the bottom(pressure) side of the valve and the top(vacuum) side of the valve during throttle modulation.
There is a delay between when the vacuum line will have the same amount of pressure or vaccum as the hard pipe connected to the bottom of the valve. This creates the fluttering concern at throttle modualation.
This feeling is exacerbated by the design of the older valve's piston. We experimented with different designs and were unable to create a piston that performed effectively within the older valve's body.
--------------------------------------------------------------------------------------------------------
To make a long story short....
Yes, the new RS valve has almost completely eliminated the fluttering concerns.
We have changed the design of the piston, incorporated the highest possible flowing ports and internal valve bore, and have used a spring design that can be precisely adjusted to each application.
A very slight amount of fluttering will still exsist, but only at part throttle due to the modulation of the throttle and the above mentioned pressure differential.
We have successfuly replicated the fluttering concern felt with the older valve on our own Evo's multiple times, so we are familiar with what everyone is describing, and we spent a lot of time trying to eliminate it within the exsisting valve, but the inability to do so partially lead to the development of the RS valve.
It is almost impossible for me to effectively describe how significant the reduction of fluttering is when using this valve in comparison to the older Evo valve.
It's just not something that is felt except under extreme on/off throttle modulation. (A good analogy is when someone tells you you are using the gass pedal like a light switch. Either on or off.) That is the only circumstance under which a very slight amount of fluttering will be felt, but not nearly to the extent to which the drivability of the car will suffer.
If anyone is in the Orlando area and would like to drive my car (with me in it, of course) to try out the drivability of the valve, please let me know.
It is almost impossible for me to effectively describe how significant the reduction of fluttering is when using this valve in comparison to the older Evo valve.
It's just not something that is felt except under extreme on/off throttle modulation. (A good analogy is when someone tells you you are using the gass pedal like a light switch. Either on or off.) That is the only circumstance under which a very slight amount of fluttering will be felt, but not nearly to the extent to which the drivability of the car will suffer.
If anyone is in the Orlando area and would like to drive my car (with me in it, of course) to try out the drivability of the valve, please let me know.
Originally Posted by tcarretti
Mike,
thanks for the clarification. I really appreciate it.......
Tony
thanks for the clarification. I really appreciate it.......
Tony
We are here to offer whatever support we can concerning our products, so please let me know if anything else is of concern.
(This goes to anyone!)
Originally Posted by vtsnake
Nothing else is required to allow the valve to work.
The FMDVRS-R is already built with the appropriately sized 34mm inlet/outlet ports and will "bolt" right into the factory valve's location.
(I will try to get some pictures of mine up tomorrow.)
It will be required, however, to tune the valve to your application once installed, but no other components are required
The FMDVRS-R is already built with the appropriately sized 34mm inlet/outlet ports and will "bolt" right into the factory valve's location.
(I will try to get some pictures of mine up tomorrow.)
It will be required, however, to tune the valve to your application once installed, but no other components are required
Originally Posted by gixxer9
How difficult is it to tune? It cannot be very hard if it is only adjusted by the knob on top...