G
Guest
·I've borrowed a Forge VTA dump valve from a friend for evaluation purposes and have a few questions.
Despite my best attempts I cannot get the car to stall when braking to a halt etc., Forge's website mentions something about their VTA valve for the Mits being specially designed to prevent this but as this valve was sold for a GTiR (they list the part numbers separately) I'm wondering if there is something about their design that prevents it?
Sometimes when lifting off there is a pronounced shudder from the drivetrain. I assume these valves can be adjusted so do I need to loosen the spring so that the vacuum overcomes the spring earlier and gives a smoother transition from boost to vacuum?
On the plus side, it seems that my oem valve isn't leaking that much, if at all. This was the main reason for testing it in the first place. The boost response with the Forge is pretty much the same as before, the only real difference is that there is a slight overboost when flooring the throttle but as I only run 12 psi that shouldn't be a problem - my boost guage has never shown more that about 14 psi in it's life!
I'd like to hear opinions from anyone who has one of the valves for their car.
Oh, and I don't think all this PSSSHHT!-ing is for me, I feel too much like a ned already after getting my louder exhaust!
Despite my best attempts I cannot get the car to stall when braking to a halt etc., Forge's website mentions something about their VTA valve for the Mits being specially designed to prevent this but as this valve was sold for a GTiR (they list the part numbers separately) I'm wondering if there is something about their design that prevents it?
Sometimes when lifting off there is a pronounced shudder from the drivetrain. I assume these valves can be adjusted so do I need to loosen the spring so that the vacuum overcomes the spring earlier and gives a smoother transition from boost to vacuum?
On the plus side, it seems that my oem valve isn't leaking that much, if at all. This was the main reason for testing it in the first place. The boost response with the Forge is pretty much the same as before, the only real difference is that there is a slight overboost when flooring the throttle but as I only run 12 psi that shouldn't be a problem - my boost guage has never shown more that about 14 psi in it's life!
I'd like to hear opinions from anyone who has one of the valves for their car.
Oh, and I don't think all this PSSSHHT!-ing is for me, I feel too much like a ned already after getting my louder exhaust!