The Forgotten On

Add the 94-95 GTS style auto kickdown. It works great and makes the car much more fun to drive in that you no longer need to floor the car to get it to downshift.

ptuomov

PcarMiami

PcarMiami

ptuomov

Porken experimented with reversing the flappy operation such that it is normally open and temporarily closed where there's a benefit. He might be able to make some comments on whether this was worth it.

I think the partial throttle torque is pretty much irrelevant. You can always press the pedal more or less to get what you want. What's more relevant is the stability of the partial throttle torque, in two ways. First, as the rpms change you want the same amount of torque at the same throttle angle to have a nice to drive car. This might be worth testing, but I expect there not to be much of a difference between flappy open and flappy closed modes. Second, at a given cruise rpm, you want the same throttle angle to result in a consistent amount of torque. With high overlap cams and a single-throttle plenum manifold, you can get the torque to be unstable and the engine surging and buckling. This is not relevant with S4 or GT cams, as they don't have any overlap to speak of.

worf928

davek9

PcarMiami, what condition is the S4 Auto, are you sure all is working at 100%, MAF, Knock and HAL sensors, car will run fine/OK even if they are not 100% but will be down on power?
There is a big difference in GT to an S4 as already pointed out, and if you are not running out 1st gear that too will make the launch feel heavy..

As far as Kick down goes just add an additional switch inline w/ the peddle Kick down and bump it to first if in second and at low RPM.

PcarMiami

davek9

General question: Does a Flappy make a difference on a Boosted car, is it still needed?
I recall reading some just remove the plate and open up the intake.

Thanks,

Dave

hacker-pschorr

Yes
Same function under boost as N/A.

ptuomov

If you're not knock limited, then absolutely it does the same for you as with a normally aspirated car with a turbo or centrifugal supercharger. If you are knock limited at say 2500 rpm and have to bleed of exhaust in a turbo or boost in a belt-driven supercharger at such a low rpm, then the flappy doesn't help much.

ptuomov

merchauser

my flappy appears to be fully functional, but wondering if a flappy can open or close too soon or too late?
if so, what are symptoms?

is there any adjustability in the set up?

DR

Hi Dave,

If using the "correct" type of boost, there is NO Flappy to worry about..ha, ha! J/K

Cheers,

Dave

FredR

The only way I know of that it can be adjusted is if you have access to and use Sharktuner. The command to open is generated in the engine management computer and that thing either works or it does not.