924Board.org

[isuras2]

Just wondering what RPMs I should shift at during normal driving conditions. I have been shifting at 3-4k, but might need to wait a little longer. It does sound like the engine is racing when I shift, but that could also be the loud muffler.

Thanks,
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

[morghen]

what do you mean normal condition?

when you want to go slow you slowly push on the throtle and you shift under 3000 RPM

when you want to race you push the throtle all the way and you shift at 6000 RPM
_________________
Supercharger and EFI kits
https://www.the924.com

[924er]

i think the best time on a normal condition is 3500, sumtimes i hit 4000. when i race i take it all the way until i hit the tip of the red line
_________________
80' Porsche 924 NA - Slower then a S L O W
86' Porsche 951- New toy

[Khal]

[Smoothie]

For the racing while shifting (if it actually exists), you could check the throttle - make sure the return spring is there, plus give it a shot of carb cleaner or wd-40 to ensure that the throttle isn't sticking open temporarily instead of closing right away.

There's also a device called the deceleration valve (sometimes referred to as the anti-backfire valve) - this lets some air in, bypassing the throttle when the throttle shuts to give the engine a more gradual deceleration between shifts. As I recall, it affects emissions by eliminating a spike in NOx each time the throttle snaps shut, plus it eliminates the backfires that would occur otherwise.
Anyway- It seems at least possible that if this valve is malfunctioning, it could have the opposite effect and open too wide, causing the engine to over-rev.

The possibility of the distributors' centrifugal advance sticking may be another thing to look into.
_________________
"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Khal]

[924er]