Does anyone driving a MT TSX notice a HUGE bog when shifting from first to second?
My car seems to fall on it's face on the upshift, it seems much worse under heavy acceleration but it does it all the time....Please tell me this isn't normal!! Is there a software/firmware update? I've only got 1200 miles on the car! Help!

 

Hmmm, thats a great question. Anyone?

 

its true, search and you'll find many threads on the issue. I wish there was "software/firmware", but it seems its a gearing issue.

 

These should help.

http://www.acura-tsx.com/forums/show...=1st+2nd+shift

http://www.acura-tsx.com/forums/show...=1st+2nd+shift

http://www.acura-tsx.com/forums/show...=1st+2nd+shift

 

Thanks for the links!! They were very helpful. It seems to me that the problem is with dbw mapping or something like that 'cause the shift is much better when made slooooowly and length of time to make the shift obviously does not change the gear ratios! BTW..I have no issues with "notchiness", just the feeling that the power goes away when I let the clutch out in second. It is really bugging me in an otherwise great car!!

 

That's true. But it DOES change what RPM you're at. Bogging comes from erring on the high side of being rev matched (and getting your engine RPMs dragged down by the weight of the car). The quicker you shift, the more unmatched you'll be, and the more bogging you experience. The gear ratios DO determine what RPM you need to be at to be properly matched in the next gear. So with a bigger gap in ratios, you'll bog more given the same length of time to make the shift. It's worst at redline, but there's nothing you can do for now.

Not sure if that made sense, but I'm tired...

 

Clutch, that did make sense. The other thing that I think is happening (it's probably mentioned in one of those threads above) is that the DBW keeps the RPM up for a short time after throttle lift-off. Seems like about 300-400 ms. That tends to accentuate the problem of RPM on the high side of being rev matched because revs don't drop as quickly as you'd expect.

 

You're right. They do this for emissions reasons.

Actually everything new about engines that sucks is for emissions.

 

Welcome to 1973.

 

Make sure you have the VSA turned off for 0-60 runs. You might be getting some wheelspin on the 1-2 shift which is causing the VSA to kick in and ruin the fun.

 

At first I thought it was a VSA issue because I only noticed it during the 1-2 shift and hard acceleration, I thought I might be chirping the tires. Of course turning the VSA off didn't help.

Both of your comments make sense as I have noticed the very irritating trait of the rpm's hold for a few ms' when shifting, I think to burn residual fuel when the DBW butterfly closes.

Slowing the whole process down definetly helps....I guess I'm just going to have to learn (more) paitence!

Thanks for the feedback guys!

 

That does help with smoothness and "not-bogging", but it doesn't help you go fast. If you're trying to get your best 0-60, QM, etc. you just have to feel the bog. Try to get back on the gas as soon as possible to minimize the effects. Good luck.