had any1 here encounter gear grinding when shifting at high rpm ? especially 1-2 shift.

i know there is the TSB on the 1-2 shift, but for those who has not got that problem, how does the transmission perform at high rpm shiftings ?

I cant wait to have mine 01' broken-in and hear the vtec.

 

There are a bunch of people that have experienced grinding at any RPM shifting from 1-2. The TSB is suppose to address this. Personally, I don't have the grind, but I do find it easier to shift at higher RPMs.

 

Shifting at the redline is best. If you shift at the peak, the revs will be too low after the shift. For the techno geeks, you want to maximize the area under the torque curve through your shifts, and to do that, you have to shift at the redline.

 

Just punch it until you see the red zone flashing then shift ... It's the beauty of the S2K at it's very best. Just make sure you don't do it too late when it cuts the fuel.

 

Did it couple of times. You better be good at it or you smell something funny

 

[QUOTE]Originally posted by gregstevens
[B]Personally, I run it to the red every time I'm trying to squeeze out the very fastest run.

 

... actually - blush, blush - in 4th and 5th I'm not 100% sure that shifting at the redline will produce the best ETs.

The reason is that the 4th to 5th and 5th to 6th gear ratio is only 1.2 while 2nd to 3th and 3th to 4th is substantially higher (1.38 & 1.27). So the drop in revs decreases on every upshift thru the gears.

The result is that what applies to an upshift may not apply to the next. I apologize for having misled you before, but the Honda force charts do not cover all the rpm range in 5th and 6th.

There may be an ET advantage to short shifting in 4th and 5th. I have not made the calculations myself, maybe someone will take care of that.

 

[QUOTE]Originally posted by Luis
[B]... actually - blush, blush - in 4th and 5th I'm not 100% sure that shifting at the redline will produce the best ETs.

 

Hard to tell from those graphs. Not enough resolution.

From looking at a JDM torque curve, it looks like the engine pulls 18kgm at 9krpm, maybe a bit less. Upshifting at 9krpm on 5th lands you on 7.5krpm exactly at max torque of 22.2 kgm.

18kgm*1.2 (5th to 6th gearing ratio) gives you 21.6kgm, so it's a close call.

I'd say you'd have to get on a stretch of a freeway with a stopwatch in your hand to really find out.

 

That is not a power shift. A power shift you use the clutch but never let up on the gas.