Too slow rpm Drop between shifts 993

[e p slick]

Other than installing a titanium clutch and flywheel is there a way to quicken rpm drop between shifts on my 3.6 993 NA? Can any DME work achieve this objective?

EPS

[dtakenname]

Hi,

Why?

While banging gears, don't you want to have your rpms up there. Isn't that why they blip the throttle when the clutch is pressed down during up shifts?

[Steve@Rennsport]

Originally Posted by e p slick

Other than installing a titanium clutch and flywheel is there a way to quicken rpm drop between shifts on my 3.6 993 NA? Can any DME work achieve this objective?

EPS

Hi Paul,

Is this for the 993 or a 3.6 in an early car??

[Flieger]

Generally the blip is only for downshifts on a warmed up transmission. The upshifts can usually be done without the blip since the higher gear requires a slower engine speed so the natural slowdown is working for you. The gear spacing and drag on the rotating components needs to be right, though, otherwise you may need to wait for the engine to slow, which can happen on CIS cars. If the car is like an MFI race motor it may need a blip on the upshift if the driver is not fast enough in the shift.

[e p slick]

Throttle control. Clutch/throttle relationship response. If I wanted grandpa's Oldsmobile I'd have put a Hydramatic or fluid drive in the car. Want more of a WRC action but have to run the clutch. (New Centerforce).

EPS

Originally Posted by dtakenname

Hi,

Why?

While banging gears, don't you want to have your rpms up there. Isn't that why they blip the throttle when the clutch is pressed down during up shifts?

[e p slick]

Steve: It's for the 3.6 conversion in my 86 911. Like I mentioned above I want much more/quicker throttle control, clutch/throttle relationship response. If I wanted the car to drive like grandpa's Oldsmobile I'd have put a Hydramatic or fluid drive in the car. Want more of a WRC action but have to run the clutch. (New Centerforce).

How are the cats? Mine have learned not to go outside, thus still live, with the bobcats and occasional mountain lion on the prowl around the house. Saw a 5' wingspan owl the other night out on a cat hunt.

Best regards

EPS

Originally Posted by Steve@Rennsport

Hi Paul,

Is this for the 993 or a 3.6 in an early car??

[GaryR]

Originally Posted by e p slick

Other than installing a titanium clutch and flywheel is there a way to quicken rpm drop between shifts on my 3.6 993 NA? Can any DME work achieve this objective?

EPS

If i'm reading this correctly ("quicken rpm drop") you want the RPM's to drop FASTER between shifts? Seems to me lightening the flywheel assembly would have the opposite effect. Now if you want to "lessen RPM drop" that would be one way to achieve it.. Tighter gearing would get you similar results looking at it a different way.

[e p slick]

The greater the rotating mass the more the inertia and thus the longer the time for the reduction in speed of the rotating mass.

Lighter flywheel not in my budget.

Kepler

Originally Posted by GaryR

If i'm reading this correctly ("quicken rpm drop") you want the RPM's to drop FASTER between shifts? Seems to me lightening the flywheel assembly would have the opposite effect. Now if you want to "lessen RPM drop" that would be one way to achieve it.. Tighter gearing would get you similar results looking at it a different way.

[GaryR]

Originally Posted by e p slick

The greater the rotating mass the more the inertia and thus the longer the time for the reduction in speed of the rotating mass.

Lighter flywheel not in my budget.

Kepler

Makes sense, I think I had "rev's faster" = lighter in my head...

[dtakenname]

Hello,

These guys charge 160$ to lighten your flywheel, may be that works for you.

lightened flywheels

[Bill Verburg]

The heaviest 915 flywheel ever made is as light or lighter than any g50 flywheel.

If the revs aren't dropping during a shift I suspect that you still have binding of some sort in the throttle linkage.