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Old 11-29-2003, 09:09 AM   #1
zmw
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Default yo... Drive by wire?

Posting here because I don't want the onslaught of replies. i might or might not get in 2.5LTurbo forum...

Anyway - So I've been noticing that with the drive by wire, It seems every time I depress the clutch it blips the throttle up a few hundred rpms, is this by design or am I just a crappy driver? or both?

I do like the drive by wire though under normal conditions, it doesn't buck like the WRX did when you were in traffic and just let of the gas completely, seems like the drive by wire brings throttle down quickly but not violently....

Anyone else notice this stuff or am i just retarded and I was driving the volvo too long?

-Z
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Old 11-29-2003, 09:26 AM   #2
SubaruPilot
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Your timing of depressing the clutch and releasing/letting off the gas is just slightly off when you are making a shift. It is just your technique, mine was messed up too. I just practiced and was able to get it just right over time. If you can watch the rpm guage while you drive, watch it in a second gear pull/acceleration and try to time your pedal movements such that when you make the shift to third the rpm needle peaks and drops off slightly when you shift and doesn't blip.
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Old 11-29-2003, 09:46 AM   #3
zmw
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I'm not entirely sure that's it - I have on several occasions (car still in break in, so this is under light driving) made a conscious effort to completely let my foot off the gas, wait a split second and depress the clutch, it still blips up... I can't decide if it's by design or fault... Here's what I THINK is happening... it's long winded so only read if you care...

I suspect the ECU is going through some type of deceleration routine that gradually lets off the throttle (well more gradually than a cable and just lifting your foot, but not slowly by any means) and when i depress the clutch while it is in that process it is still applying a slight amount of throttle causing the rpms to jump just briefly.... it's not like it's out of control, if i shift right at 3500 rpms, it probably jumps to 3650-3700 if that...

I dunno... it's similar i think to what happen with the 2002s while on cruise control, if you yanked the car outta gear it didn't respond right away, it blipped the throttle up and then finally let go.

Don't get me wrong I'm not saying I am the greatest driver, and it is certainly a new car, However it definitely has to be part of the drive by wire as out of the other 2 manuals we own, they don't do it, and my rex certainly didn't.

I'm sure that just adjusting my driving or shifting faster (RAWR!) will fix the problem, it also might not do it while under hard acceleration, and since i have the whopping 280 miles on it I don't know yet...

Peace - Z
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Old 11-29-2003, 11:25 AM   #4
Strepto
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I've heard of the same thing happening with other drive by wire vehicles. I believe Volvo's did this?

Kind of a shot in the dark, but it could be possible that it's a mechanism to smooth out downshifts.

I've heard of it being normal though. Don't know if it is for the STi.

Sorry I can't help much.

-Ro
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Old 11-29-2003, 12:37 PM   #5
Drac9
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I noticed that in my buddie's sti. Seems like it's normal
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Old 11-29-2003, 12:47 PM   #6
CirrusWRX
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Sorry to jump in here, but I believe this has nothing at all to do with technique, or DBW. If you do a search, you will see that people were experiencing this when the WRX's first came out (and probably even before that...)

I think the most "common" conclusion is that it's actually emissions related. It IS controlled by the ECU, and, to some extent, it can be REDUCED by altering your driving habbits, but it is not 100% driver controllable. In my 02 WRX I went out and did some testing and under various conditions, I kid you not that I could be "coasting" with my foot off the gas after a hard acceleration (only for an instant) and hit the clutch, the RPM's would still blip.

Some other people believe it has to do with a heavy flywheel- not sure I'm with that... But other people with 5mt or 6mt CARS (non-subaru alike) that are relatively new have experienced this "rpm blip" and many cite something to do with burning off the extra fuel before it gets released out the tailpipe in an effort to reduce emissions.

That's my "answer" and I'm living with it, but feel free to find another one
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Old 11-29-2003, 01:25 PM   #7
zmw
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Cirrus,

Hmmm interesting reply - certainly possible.

The new S60 Volvo R does do this but I thought it was only on downshifts with the 6MT, how it knows the difference between downshift and up**** before it happens is a mystery..... but volvo is smarter than I am.

I will agree that in theory driving habbit could cause some of this too, but I think more likely driving habbit will just learn to minimize it. - I was just wondering if anyone else had experienced it, to make sure I wasn't smoking crack....

-Z
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Old 11-29-2003, 11:13 PM   #8
COwannago
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I experienced this when driving the STi as well.

Nick C.

Is habbit some kind of specialized hobbit?
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Old 11-29-2003, 11:37 PM   #9
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It's just the retarded driver
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