TypeTSX

I am stil in my break-in period....450 miles to go, and I was on the freeway driving as per the break-in procedure by varying my rpms (and pissing off alotta motorist), left it in gear and constantly let off the throttle and let it decline to 2k rpm, and then slowly throttle it up to 3.5k. I've noticed that there is a slight lurching motion when reapplying the throttle in gear. Can anyone explain this, what's the mechanics of this "phenomenon". Also noticed this same thing at low speeds, IE...in first gear, let go of throttle , then reapply...lurches...only way to remedy this is to reengage the clutch.

id888

Yeah, I get this with the TSX as well. It's not unique to this car, but it seems more pronounced than with other manuals I've driven. I give it more gas and feather the clutch. I know that's not so good for clutch life, but I don't want my passengers blowing chunks in my interior.

provench

You know ... I have noticed this same thing and it is kinda annoying if you pay attention to it. Could it be the drive by wire? This was one of the minor things I was going to point out when I took my car in for it's 5K service (oil, rotate, etc.).

Anyone else got any thoughts on this one? Does the 5AT do this when you press the gas after letting up on it and cruising?

AKay

mine doesnt do that and its a 5AT but in manumatic it does some wierd jerks.
AKay

TypeTSX

Yes I agree that these symptoms aren't unique to the TSX 6MT, just more noticable....could possibly be due to the dbw, who knows. I don't think the auto TSX experiances this, because I had a auto honda prior and never felt any lurching upon reapplying the throttle.
Tried searching in other forums and on google, and the only explanation I received was because of the lack of low end power. Any truth in this?

provench

Yeah - I have had many Honda/Acura products and the TSX has the most pronounced jerk feeling on throttle apply when coming off of "coast" in gear with no throttle. It is like the fuel influx is not smooth or something (yeah - real technical ey? ).

Lack of low end torque makes zero sense ... that is not it. The feeling I am talking about has nothing to do with acceleration, just an engage/disengage of the gas pedal while in gear.

fdl

Guys, we had a similar discussion regarding this a while back. Not sure if there is anything useful in this thread but here it is...

http://www.acura-tsx.com/forums/show...&threadid=1729

provench

Just read the link ... not what I am talking about ... that thread is talking about what all manuals do as they are revved up, etc, etc. This is much different than being at 5K RPM's and pulling up on the accelerator for the "bronco ride" as was described in the other thread

What I am talking about here is a very harsh kick in of the throttle. Just go 50-60 in 6th let up on the gas, press it back in .... it will give a quick, but harsh jerk as the accelerator re-engages. I have not had another Acura do this to me .... most recently the RSX-S .... which I don't think is drive by wire, which is why I brought that up.

fdl

Ahh.,.ok. My mistake then. I can;t say I have really experienced this..or perhaps I have and just never really noticed. I'll try it out tomorrow.

TypeTSX

Precisely what I was referring to.

joedokes

I've noticed this as well, it also happens at low speeds as well.

swami

It's definitely the DBW. I have the 5AT and if you let off the gas and get back on it, sometimes it jerks. Seems to depend on the RPM as I've experienced it in a 6MT and the 5AT. The gear your in doesn't seem to matter, more than likely it's the lapse in throttle application.

ClutchPerformer

It's definitely the drive by wire system. What else could make the throttle so knife-edged? It jerks when you're coming off the gas, too. It's kind of annoying actually, and its one of the only things I'd change about the car (not taking away the DBW, but changing the control logic to reduce that jerkiness). It's not a huge problem though. So I guess I can live with it....

phirenze

It is defanitely the drive by wire.
I've driven both cars back to back and both had it exactly the same.
yes, it really pisses me off too. you can avoid it though by pressing the throttle really softly. The best way to do this is place your heal on the ground and align your foot parallel to the throttle so your toe presses it up at the top. You can't drive the throttle like its hinged from the top like I treid to do at first. Once you realize this the problem will go away shortly.

dabuda

i dont like the jerkiness but have learned to live with it. i think the TSX would've been better off withouth DBW, for the 6SPDs anyway. if i want more power i'll downshift, dont need some stinking DBW to do it for me!

provench

Yeah ... DBW ... ok ...

Now that I know what it is ... I am over it now

Johns

I doubt that this is a drive by wire problem. I have a 6 speed Mercedes C230K which is drive by wire, and it is very smooth when re-applying the throttle. My 2000VW Passat jerked almost as bad as the TSX. You just learn to get used to it.

jiggaman

does anyone think that this jerking will lessen as the engine breaks in?

swami

More than likely it will lessen as you gain more experience in the car. Everything new takes a little bit of adapting to.

ClutchPerformer

It doesn't. Sorry.

provench

Gotta read back ... this is not something a driver can "master" ... it is just a behavior the throttle has ...

As for the Mercedes ... yep ... my point was this was a TSX drive by wire implementation problem. I will ask during my oil change (in a few weeks probably).

TSXautoXer

I think it has to do with different DBW profile. In highway cruising speed, DBW switch to a more aggressive profile, thus a little input translate to a lot of revs. Whereas on city driving speed, DBW uses a less aggressive profile to help smooth operation. So DBW is not linear, thus drivers will have to get use to it. I tried it today, and I found out that it is possible to reengage throttle without any jerk/lurch. However, I will have to do it delibrately, rather just put my foot back on. And I have come up with a theory:

When a driver tried to reengage throttle after lift off, he/she would just put the foot back on throttle, but on to the original position. Most likely, it's going to be a little more than the previous position. Since DBW is at it's aggressive profile, the acceleration will pull the driver's foot away from the throttle pedal, and immediately the car decelerates, and put the driver's foot back to the pedal. This process will repeat a number of times and thus the jerkiness. For drivers who just experienced lurching, my bet is that their foot is just firmer, and may have to do with driving position as well. So, I would think the different profile of DBW is the main culprit of all these phenomenom. I will try it on a BMW M3 when I got a chance since the DBW system on that car has driver switchable profile. (TSX has auto switching)