Transmission & Drivetrain Gearboxes, Differentials, Clutches

how to make a tranny survive at high rpms?

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Old Jul 15, 2009 | 10:02 AM
  #1  
JDogg's Avatar
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Default how to make a tranny survive at high rpms?

Is there anything that can be done with a honda tranny to slow the wearing of the syncros at high rpm shifts?

i have a problem lifting to shift, its way more fun to leave my foot on the floor, obviously we all know that stock syncro's dont like this. they dont slow the gear enough and it ends up trashing the sleeve and gear.

certain fluid types seem to help but its not a solution, it just prolongs the inevitable.
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Old Jul 15, 2009 | 12:09 PM
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Default Re: how to make a tranny survive at high rpms?

either learn to drive, invest in ignition interuptor, run closer ratios, or invest in symchros.

OR have tranny convert to dog style, but that would be several thousand $$$$.
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Old Jul 15, 2009 | 12:17 PM
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Default Re: how to make a tranny survive at high rpms?

i know how to drive, i rarely miss a gear, i just like to shift wot.

even new syncros dont last too long. I dont want to have to shift slower. I want the mess to live with 9000 rpm shifts. dog box is out of the question.

there has to be a way to do it.
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Old Jul 15, 2009 | 08:04 PM
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Default Re: how to make a tranny survive at high rpms?

someone sells carbon coated OEM synchros. but like you said, prolonging the inevitable.
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Old Jul 15, 2009 | 11:49 PM
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Default Re: how to make a tranny survive at high rpms?

Originally Posted by JDogg
i know how to drive, i rarely miss a gear, i just like to shift wot.

even new syncros dont last too long. I dont want to have to shift slower. I want the mess to live with 9000 rpm shifts. dog box is out of the question.

there has to be a way to do it.
No way around it, you don't wanna spend the money, pack it up and go home.

Synchros are just brake pads, a wear item. Would you expect a OEM pad to work for and enduro at Road Atlanta????

It won't happen, you have to make the choice.
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Old Jul 16, 2009 | 01:32 PM
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Default Re: how to make a tranny survive at high rpms?

Clutch it.

Even with carbon-moly synchros and scuffed cones, you'll still wear the dog teeth on the gear and slider at an extreme pace. Synchro ribs will be worn faster and gear cone will likely glaze over.
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Old Jul 16, 2009 | 02:00 PM
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Default Re: how to make a tranny survive at high rpms?

Originally Posted by Aquafina
Clutch it.

Even with carbon-moly synchros and scuffed cones, you'll still wear the dog teeth on the gear and slider at an extreme pace. Synchro ribs will be worn faster and gear cone will likely glaze over.
i didnt say i dont want to use the clutch.. i said i dont want to lift off the gas..

ever see howard from rlz shift.. thats about how it is
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Old Jul 17, 2009 | 12:03 AM
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Default Re: how to make a tranny survive at high rpms?

Yup, full-throttle shifting

Best you can do is change to Carbon-Moly synchros, and keep replacing them every 10-15 passes or so if you want to keep your dog teeth and slider teeth in good condition.

For oil, make sure to run one that includes synchro/friction modifiers to help with shifting (most fluids with the "synchromesh" label do).
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Old Jul 17, 2009 | 04:43 AM
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Default Re: how to make a tranny survive at high rpms?

Originally Posted by Mista Bone
either learn to drive, invest in ignition interuptor, run closer ratios, or invest in symchros.

OR have tranny convert to dog style, but that would be several thousand $$$$.
You can convert your b series tranny to dog engagement for $730-$750
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Old Jul 17, 2009 | 04:46 AM
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Default Re: how to make a tranny survive at high rpms?

Yeah, the Liberty Faceplate option
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Old Jul 17, 2009 | 05:18 AM
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Default Re: how to make a tranny survive at high rpms?

yes sir
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Old Jul 17, 2009 | 07:18 AM
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Default Re: how to make a tranny survive at high rpms?

Originally Posted by MFactory
Yeah, the Liberty Faceplate option
some how i dont see that as a great idea for my daily driver..

since you're the tranny expert.. what kind of fluid would you recommend for my s2000?
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Old Jul 17, 2009 | 07:33 AM
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Default Re: how to make a tranny survive at high rpms?

yeah it would be about as bad as driving around on a "base map"
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Old Jul 17, 2009 | 09:15 PM
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Default Re: how to make a tranny survive at high rpms?

I used to flat shift my Z6 at 7000 rpm on nitrous, never left, just tap the clutch and shift.
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Old Jul 19, 2009 | 10:41 AM
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Default Re: how to make a tranny survive at high rpms?

yeah, thats pretty much it.. at 7000 rpms a honda tranny will last forever, at 9000 not so much..
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