The issue is really the fact that all sequential gearboxes are dog engagement without any synchros. As such, you've got to be deliberate and commited to every shift. Ask any noobie 997 Cup Car owner about their first weekend at the track and their experience in getting used to the gearbox. With a synchronized box you smoothly and gradually pull the shifter into gear while the synchros do their job of matching the speed of the idling gear and the fixed gear as it engages it.

In a sequential, those gears aren't speed matched until the dog teeth slip into place and the gear engages. It's not something you can pussyfoot around with. It requires a solid pull into gear in one smooth fluid movement.

And it's something that even the professionals can mess up in a racing environment. Do you know what took our car out of the 24 Hours of Daytona this year? It was a downshift into 4th that wasn't fully committed. We know this because of the telemetry on the car. The strain gauge says that the shifter wasn't pushed down hard enough. So what happened is the edge of the dog tooth contacted partially and it kicked it back into 5th gear. It kicked it so hard and instantaneously that it ripped a tooth right off the 5th gear, which proceeded to punch a whole in the side of the gearbox, draining it of gear oil. 12 hours in, running 5th place in class, and 1 bad shift ended the night.

 

^^ Matt your story brings tears to my eyes...one simple move and it's all done that's all it takes, sorry to hear brother and best of luck next time around ...

 

It was a real shame but sometimes that's racing. There's been talk about how the new Cup Cars practically drive themselves, but there's always going to be the human element. Races are won and lost most times at the hands of the driver.

 

another thing that would bring tears to my eyes is the bill afterwards

 

An option from Quaife:

http://www.motorsport-sales.com/inde...oducts_id=1697

 

so when downshifting it is not necessary to blip the throttle?

 

Well that was the final deciding factor on whether to go on or not. PMNA had a replacement gearbox in their trailer that would have taken half an hour to get into the car. There were 4 drivers, each with a damage deposit placed with the team. They took a vote whether or not it was worth it to them to finish, but finish as a backmarker, and spend the damage deposit money, or pull out. It was democratic and 3-1 they decided to call it a night.

 

When driving a dog box, sequential or not, rev-matching strongly encouraged. If I were to daily drive one of these boxes on the street, I would personally rev-match and double clutch most every shift. I have street driven a Subaru dog box and that's exactly what I did. Like I said above, it requires a driver who is willing to be 100% attentive at all times. Driving a full sequential is actually a bit easier than driving an H-pattern dog box, but it's still a situation where proper driver involvement is necessary.

 

I noticed the quiafe unit only recommends 500 bhp maximum. I am looking to rebuild my transmission or convert on my 993 TT proto car. Anyone have any suggestions or recommended routes as far as the 993 cars go? I know this is 996TT forum but there wasnt any sequential talk on my homeland forum.

 

how about the oakley shifter system instead. Feel of sequential without drawbacks on the street. Evoms did that setup with their built 996GT2 up here in denver and it was one fast shifting *****.


AT 6000 FT!!!

 

Gearbox is near enough the same.996 model on is cable instead of rod shift mechanism-- but easy enough to change(yes-it does cost$).993 TT box could be converted to sequential .That may be the cheapest option in fact-as to change to 996/7 box(bell housing is different-same size) would mean other changes.
Forget the Quaife box-- I am yet to hear anyone say anything nice about it-- and that is on minus 500hp engines.My recommendation-- speak to Matt.Second choice-- speak to Matt
3rd choice-- you guessed it!!

 

Could you PM me info on this and price? Very interested!

Thank You

 

So did I. If he did, I could help there. We can do a genuine sequential conversion on your stock box.



Hello sir do you have a contact number I can speak with you about my car.
Thank you

 

holy thread 🧵 resurrection!