Shifting a FI Car

Sh0velMan · 05-14-2013, 03:33 PM

Quote:

Originally Posted by phunk

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, 03:40 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, 09:27 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, 09:39 PM

Quote:

Originally Posted by Dwnshift

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, 10:26 PM

Quote:

Originally Posted by Mitco39

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, 10:44 PM

Quote:

Originally Posted by Sh0velMan

@ 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, 11:30 PM

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

Mitco39 · 05-15-2013, 11:32 PM

Quote:

Originally Posted by NitrousZ34

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, 03:35 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, 09:23 AM

Quote:

Originally Posted by Dwnshift

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, 04:38 PM

It happens...live and learn.

gomer_110 · 05-17-2013, 04:40 PM

So that's what happened in Daytona.

Mr.Squeeze · 09-09-2013, 02:34 PM

Quote:

Originally Posted by phunk

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, 02:57 PM

I shift at 9000 but my tach goes to 11.

phunk · 09-09-2013, 03:01 PM

Quote:

Originally Posted by Mr.Squeeze

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

05-14-2013, 03:40 PM	#17 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	Thanks guys for all the info on both sides. I've decided that I'm going to try this next ttime at the track. __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

05-15-2013, 09:27 PM	#18 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	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. Sh0velMan likes this.

05-17-2013, 04:40 PM	#27 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	So that's what happened in Daytona. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

09-09-2013, 02:57 PM	#29 (permalink)
Arrvaxx A True Z Fanatic Join Date: Jul 2013 Location: Whore Island, MN Posts: 1,243 Drives: 40th F.I. Twin Turbo Rep Power: 18	I shift at 9000 but my tach goes to 11. __________________ 2010 370Z 40th Anniversary (#480 born 1/19/2010) Fast Intentions Twin Turbo \| Varis Arising II \| Limited Edition Recaro Sportster \| Tuned by Specialty Z \| 604hp 525 torque @14lbs boost on 100 octane

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05-15-2013, 11:30 PM	#22 (permalink)
NitrousZ34 Banned Join Date: Apr 2012 Location: Canoga Posts: 505 Drives: Myself crazy Rep Power: 0	I think someone on here has kevlar syncros. Might look into something like that.

05-16-2013, 03:35 AM	#24 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	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.

05-17-2013, 04:38 PM	#26 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	It happens...live and learn.