Rev matching does not protect your synchros at all. Rev matching helps to keep the car from going uncontrolable in a corner from changing gears. It's like hitting the brakes if you don't rev match.



As for the synchros being wear items, no they are not. Honda knows exactly what is a wear item and what is not. If they say "it might be considered a wear item", they are bullshitting you. If it is a wear item, they should know it. There shouldn't be a "might be" about it.

And $1800 to tear down the tranny and put it back together is a lie. I just had 1st, 2nd and reverse replaced and had to pay for the labor and it was only $600. It should be less to just take it apart and put it back together.

 

This concept of rev matching protecting your synchros comes up very often. But it is incorrect. I think I should explain why.

The transmission has three shafts.
1) Input shaft - this is connected to the clutch and the pressure plate, and "inputs" the power to the tranny.
2) Output shaft - This is connected to the driveshaft and "outputs" the power.
3) Layshaft - This shaft is normally below the others and has usually 1st, 2nd, and reverse on it.

When you push in the clutch, the flywheel is completely detached from the clutch. Therefore, any rev matching will have absolutely no effect on the transmission at all.

Each two gears have a synchro between them. Synchros are simply devices that replace the need to double clutch a transmission. (double clutching is when you quickly let out the clutch after dissengaging a gear and prior to engaging the next gear)

After you take the transmission out of one gear, and you start to engage the next gear, the synchro touches the next gear's collar first in order to match the speeds of the two dog teeth gears to make them mesh quicker.

Rev matching only works when you let out the clutch between shifts.

So just to be clear, rev matching has no effect on synchros at all. It just makes for a more smooth transition between gears. Which is only needed when taking a corner VERY aggressively at high speeds. Otherwise, you will probably spin out when you let the clutch out.

 

Rev-matching dosesn't do anything.....

Only DOUBLE-CLUTCHING on your downshifts will help save your synchros.

 

Hey guys...

I just want to say thanks for all of your help and input. I really appreciate all the feedback you guys have given me in this as well as my other recent threads.

I picked up my car from the Honda dealer and decided against proceeding with the tranny teardown. Based on the info here, as well as my own gut feeling, I'm guessing the warranty company would deny coverage based primarily on the fact that my synchros are not entirely broken yet.

However, 2nd gear continues to baffle me. It shifted fine at the dealer, and it shifted fine on the way home from the dealer yesterday. But this morning, it again refused to let me into 2nd, I was completely blocked out. So, I parked the car and let it sit for a few minutes while I ate breakfast. Afterwards, I started the car again, and was able to use 2nd gear normally. I have no idea what's going on with 2nd gear anymore. Needless to say, the dealer thinks I'm nuts because he has not personally experienced the 2nd gear problem, but I know there's something out of the ordinary happening (if only at times).

I'm going to monitor this over the next few days, and a local S2Ki member has very graciously offered to check out my car firsthand and make sure my shifting isn't to blame. If necessary, he's also offered to give me some tips on how to shift so as to minimize these issues. Somehow, I'm hoping that 2nd gear will be on its poorest behavior when he sees it, otherwise I can chalk up one more person who will think I'm nuts.

If I can't figure out what's going on with 2nd gear, or if I can't somehow get this resolved satisfactorily, then I'm just going to trade in the car. It'd be a shame, and I'm sure I could get this resolved if I went to great lengths, but I just don't have the time to deal with this stuff at this point in my life. I'm going to check out some cars this weekend so I can start thinking about that possibility.

Thanks a bunch for all your advice guys.

 

As Big Ben said, the $1800 labor quote is outrageous. That would be over 20 hours at most shops labor rates. R & R and overhaul tranny should be about 8 hours labor. I don't think they charge $225/hr, even in CA

 

^ Your loss if you go with another car. Sucks to be you.

 

[QUOTE]Originally posted by jyeung528
^

 

[QUOTE]Originally posted by Ash
so why would you have extended warranty based on the number of years and miles on your car, when wear and tear items aren't covered?

 

[QUOTE]Originally posted by Road Rage
I have never had a manual car where the synchcros wore out before 100k miles - is it me or is it the car? Well, one was a Honda Accord, the other an Eclipse GSX-AWD.

 

[QUOTE]Originally posted by Road Rage