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-   -   Shifting a FI Car (http://www.the370z.com/track-autocross-drifting-dragstrip/71241-shifting-fi-car.html)

Sh0velMan 05-14-2013 02:33 PM

Quote:

Originally Posted by phunk (Post 2315532)
EDIT: nevermind, rereading your last post it sounds like you just said exactly what i just said.

I agree, its about the actual RPM that you begin the shift, and how quickly you are expecting the synchronization to occur. The gas peddle position is mostly irrelevant once the clutch has been disengaged. I shift at 7500 with my setup, as I expect most people here will be. I did not do it long on the stock type clutch configuration, so maybe I should stress a little more that all my experience has been with lightweight racing clutches and perhaps with a stock style clutch, others may not see the same endurance in their trans.

Yes, we're vehemently agreeing with one another. :)

The fact you've got low-mass components make a huge difference. Less mass to slow down to synchronize the input and output shafts. If folks all go to lightweight twin disk setups, they'll prolong the life of their transmissions, even if they never power shift. (Within certain limits, the harshness of take-up in a true racing clutch can be hell on various bearings and whatnot if not driven with care)

Mitco39 05-14-2013 02:40 PM

Thanks guys for all the info on both sides. I've decided that I'm going to try this next ttime at the track.

Dwnshift 05-15-2013 08:27 PM

We run an 9 lbs flywheel...
We life the gearbox now at 6 races...then its officially a spare.
I can say ...yes..if you don't push the cluth all the way in and flat shift...its life is going to end sooner than later.
I'm just saying in my personal opinion I would t recommend a flat shift system with these particular boxes.

Mitco39 05-15-2013 08:39 PM

Quote:

Originally Posted by Dwnshift (Post 2317769)
We run an 9 lbs flywheel...
We life the gearbox now at 6 races...then its officially a spare.
I can say ...yes..if you don't push the cluth all the way in and flat shift...its life is going to end sooner than later.
I'm just saying in my personal opinion I would t recommend a flat shift system with these particular boxes.

When you are racing do you flat shift the cars? Have you ever not finished a race due to a trans issue?

I appreciate the info!

Sh0velMan 05-15-2013 09:26 PM

Quote:

Originally Posted by Mitco39 (Post 2317790)
When you are racing do you flat shift the cars? Have you ever not finished a race due to a trans issue?

I appreciate the info!

@ Daytona, he would probably have podiumed if not won if not for a tranny failure.

Mitco39 05-15-2013 09:44 PM

Quote:

Originally Posted by Sh0velMan (Post 2317884)
@ Daytona, he would probably have podiumed if not won if not for a tranny failure.

Ah, I would assume this is why they have a 6 race limit? lol. Is there anything out there to beef up these transmissions?

NitrousZ34 05-15-2013 10:30 PM

I think someone on here has kevlar syncros. Might look into something like that.

Mitco39 05-15-2013 10:32 PM

Quote:

Originally Posted by NitrousZ34 (Post 2317949)
I think someone on here has kevlar syncros. Might look into something like that.

I just came across a thread saying he used ford racing syncros.. I posted in it to see what info if any I can get out of that.

This might be my next winter project.

Dwnshift 05-16-2013 02:35 AM

Me personally ... NO I do not...but we had a driver that was attempting to do so and it cost us a very good finish.
Stripped the synchros ...broke the 5/6 shift fork.

Sh0velMan 05-16-2013 08:23 AM

Quote:

Originally Posted by Dwnshift (Post 2318096)
Me personally ... NO I do not...but we had a driver that was attempting to do so and it cost us a very good finish.
Stripped the synchros ...broke the 5/6 shift fork.

LOL 'A Driver' aka, Tim Bell. He's used to dog boxes man, can't help it!

:P

Dwnshift 05-17-2013 03:38 PM

It happens...live and learn.

gomer_110 05-17-2013 03:40 PM

So that's what happened in Daytona.

Mr.Squeeze 09-09-2013 01:34 PM

Quote:

Originally Posted by phunk (Post 2315532)
EDIT: nevermind, rereading your last post it sounds like you just said exactly what i just said.

I agree, its about the actual RPM that you begin the shift, and how quickly you are expecting the synchronization to occur. The gas peddle position is mostly irrelevant once the clutch has been disengaged. I shift at 7500 with my setup, as I expect most people here will be. I did not do it long on the stock type clutch configuration, so maybe I should stress a little more that all my experience has been with lightweight racing clutches and perhaps with a stock style clutch, others may not see the same endurance in their trans.

Well my transmission didn't like the power shifting with the OS Giken Triple Disc I blew it up this past weekend shifting at 7800 RPM .

Arrvaxx 09-09-2013 01:57 PM

I shift at 9000 but my tach goes to 11.

phunk 09-09-2013 02:01 PM

Quote:

Originally Posted by Mr.Squeeze (Post 2479169)
Well my transmission didn't like the power shifting with the OS Giken Triple Disc I blew it up this past weekend shifting at 7800 RPM .

3rd gear? if so, thats totally normal for your HP level with this trans


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