My '04 is often crunchy when shifting from 1-2. Not grinding, I know what that's like. This is just a distinctly non-smooth engagement.

 

This is intresting, i always wondered how the 04's Carbon Fiber Synchro's will holding up. pre 04's have brass sychronizers.

Although carbon fiber load capacity is higher pound per pound. Impact dynamics is not that well understood.

I'm a Structures Engineer in the Aerospace industry. And, I try to keep touch with technologies used in the Aircraft industry. Airbus is making use of alot of CF in their airplane's structure, like the Horizontal Stabilizer Mounting Lugs, but Boeing continues to use Aluminum Lug Bolted to CF Beams.

Boeing avoid using CF in locations which experience "specturm" stresses (varying stresses short duration high load, long duration low load, compression, tension, shearing, and so). CF has not proven to be very predictable, yet.

Right now I favor Boeing practices. The Airbus CF Horizontal Stab Lugs Fail, like the one that crashed in New York, after 911. Small defects can become critical quickly.

When i heard Honda used CF sycronizers in the 04'. I wondered if they are they going to last. The syncronizer experience the alot of specturm stresses. I wondered if Honda figure out a new manufacturing process that was reliable?

 

Hmmm... I heard that the new synchros are "carbon", not necesarily "carbon fiber." I imagined the synchros to be some sort of hard compound that has a high carbon content, like a ceramic but not necesarily as brittle.

 

I see, that would make a big difference. Thanks for the correction.

 

once in a while when stone cold the 1-2 shift has a crunch, i can shift slower and not get it...rest of the time it is like butter...if your car crunches all the time then it is time to get it to the dealer and reproduce the noise so they can attend to it, that is not supposed to happen, these transmissions are soooo smooth and shift soooo positive, like no other.

 

[QUOTE]Originally posted by BlitzSRM
This is intresting, i always wondered how the 04's Carbon Fiber Synchro's will holding up.

 

shifting at high RPM is actually smoother for me...and for the majority of the people here I believe...

 

I don't think that high RPM is the issue, but rather the quickness of the shift. Sounds to me like you just beat the synchronizers. This used to happen with sports cars from the '50s and later, when synchro boxes were first introduced. Anyone here ever drive a Porsche 911 with the 915 transmission? No quick-shifting on those is allowed! Slow the gear change down a bit and that might cure the problem.

 

Move your seat up more then you normally drive. See if that cures it. The 1 to 2 shift can be picky on clutch engagement. Try it even if you are sure you have the clutch to the floor and are not releasing it to soon.
George