Gear shift jerk on SST
Jan 26, 2012, 09:35 AM
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Gear shift jerk on SST
hi..
This happens only a few times, I feel a big jerk when gear drop from D2 to D1 in low speed in Normal mode. Is it normal for the SST?
This happens only a few times, I feel a big jerk when gear drop from D2 to D1 in low speed in Normal mode. Is it normal for the SST?
Jan 26, 2012, 09:57 AM
#2
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Have you been tuned?
That exact issue cropped up in some prior beta revisions of the Ralliart GST Base Map. We tracked it down - the trail led back to a minor tuning change in the SST-Throttle-Voodoo-Requested-Torque-Guru-Meditation tables. Or something.
Once the low-load, low-rpm cells were smoothed down towards stock values, it resolved the issue.I reckon the ECU was getting confused, and tried to almost throttle-blip its way from 2 to 1 in Normal Auto mode. It had no place doing that in Normal, and got itself in a knot. Once fixed, there was no blipping, no clutch action, and all was smooth once again.
But... if you're on stock ECU, it's a "take it to the dealer" kind of thing.
Rich
Jan 26, 2012, 07:39 PM
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No, it's not normal.
Have you been tuned?
That exact issue cropped up in some prior beta revisions of the Ralliart GST Base Map. We tracked it down - the trail led back to a minor tuning change in the SST-Throttle-Voodoo-Requested-Torque-Guru-Meditation tables. Or something. Once the low-load, low-rpm cells were smoothed down towards stock values, it resolved the issue.
I reckon the ECU was getting confused, and tried to almost throttle-blip its way from 2 to 1 in Normal Auto mode. It had no place doing that in Normal, and got itself in a knot. Once fixed, there was no blipping, no clutch action, and all was smooth once again.
But... if you're on stock ECU, it's a "take it to the dealer" kind of thing.
Rich
Have you been tuned?
That exact issue cropped up in some prior beta revisions of the Ralliart GST Base Map. We tracked it down - the trail led back to a minor tuning change in the SST-Throttle-Voodoo-Requested-Torque-Guru-Meditation tables. Or something.
Once the low-load, low-rpm cells were smoothed down towards stock values, it resolved the issue.I reckon the ECU was getting confused, and tried to almost throttle-blip its way from 2 to 1 in Normal Auto mode. It had no place doing that in Normal, and got itself in a knot. Once fixed, there was no blipping, no clutch action, and all was smooth once again.
But... if you're on stock ECU, it's a "take it to the dealer" kind of thing.
Rich
Will the jerk gone completely if I change the ECU or tune?
Jan 26, 2012, 08:44 PM
#5
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Nope, I can't see how.
Rich
Feb 4, 2012, 12:10 AM
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I just watch the show Top Gear, they test the new lambo aventador.. and jeremy clarkson says that flappy paddle gearbox do jerk at low speed. Let say if we are trapped in traffic jam.. The lambo gearbox of cause better than evo sst, I think..
any comment??
any comment??
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Feb 10, 2012, 04:17 AM
#10
Evolved Member
Aug 3, 2016, 10:09 PM
#14
No, it's not normal.
Have you been tuned?
That exact issue cropped up in some prior beta revisions of the Ralliart GST Base Map. We tracked it down - the trail led back to a minor tuning change in the SST-Throttle-Voodoo-Requested-Torque-Guru-Meditation tables. Or something. Once the low-load, low-rpm cells were smoothed down towards stock values, it resolved the issue.
I reckon the ECU was getting confused, and tried to almost throttle-blip its way from 2 to 1 in Normal Auto mode. It had no place doing that in Normal, and got itself in a knot. Once fixed, there was no blipping, no clutch action, and all was smooth once again.
But... if you're on stock ECU, it's a "take it to the dealer" kind of thing.
Rich
Have you been tuned?
That exact issue cropped up in some prior beta revisions of the Ralliart GST Base Map. We tracked it down - the trail led back to a minor tuning change in the SST-Throttle-Voodoo-Requested-Torque-Guru-Meditation tables. Or something.
Once the low-load, low-rpm cells were smoothed down towards stock values, it resolved the issue.I reckon the ECU was getting confused, and tried to almost throttle-blip its way from 2 to 1 in Normal Auto mode. It had no place doing that in Normal, and got itself in a knot. Once fixed, there was no blipping, no clutch action, and all was smooth once again.
But... if you're on stock ECU, it's a "take it to the dealer" kind of thing.
Rich
)My thread about this issue is here: http://www.evoxforums.com/forums/sho...d.php?t=352041
Last edited by domyz; Aug 4, 2016 at 11:23 AM.
Aug 9, 2016, 08:08 AM
#15
Evolved Member
What did you do exactly ? I have this exact issue from 2nd to 1st on my 2012 MR, all stock SST tables. This clutch action is really annoying in normal, auto mode (especially for my girlfriend who don't drive in manual mode )
My thread about this issue is here: http://www.evoxforums.com/forums/sho...d.php?t=352041
)My thread about this issue is here: http://www.evoxforums.com/forums/sho...d.php?t=352041
What did we do? We were revising the stock ECU SST-related maps, and making them not-stock.
If a stock-SST-map car in NORMAL AUTO is doing horrible clunky downshifts at low speed, it's not typical. And I don't reckon it's something that can really be "fixed" by editing ECU SST-related tables.
Rich