12-28-2020, 05:45 PM | #1 |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
Posts: 2,343
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Manually shifting A10 trans at WOT
Anyone having good luck manually shifting the A10 auto to get closer to a 6500 rpm shift at wot while running down the 1/4 mile track? (on a close to stock HP car) And I seem to be more comfortable nudging the shifter up rather than paddle shifting, speed of the shift should be the same ? yes / no
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12-28-2020, 08:59 PM | #2 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,616
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Hmm, doesn't it shift perfectly near redline in D when you're in performance shift mode? I'm not sure shifting at exactly 6500 rpm will give you the absolute highest power throughout each shift, by the way.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 Last edited by arpad_m; 12-28-2020 at 11:12 PM. |
12-28-2020, 11:03 PM | #3 | |
2020 Shadow Gray 2SS
Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019
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12-29-2020, 07:52 AM | #4 |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
Posts: 2,343
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Normally wot shifts in drive are short, especially 1-2 and the 2-3 shift. Shifting as close as possible to red line and any gear for a 1/4 mile run should be beneficial. The hard core 1/4 mile guys that run the untuneable 10 speed auto trans hopefully have tried to manually shift closer to a higher rpm and can share the info if that it can be done or that the trans lets them do just that.
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12-29-2020, 08:04 AM | #5 |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
Posts: 2,343
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I agree and am well aware of hitting the rev limiter . But the A8 and the A10 both shift way short of redline in the 1-2 shift and the 2-3 shift at WOT. I have successfully made many passes down the 1/4 mile in manual trans corvettes and Camaros (C7 corvettes and 6 gen camaros) and making a shift close to redline and not hitting the rev limiter is a challenge. It has to be much easier with a auto trans. Its also been proven a good driver can get better ETs with out launch control. A highly sensitive driver can do better than the computer.
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12-29-2020, 08:37 AM | #6 | |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,616
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Quote:
Taking the 1-2 shift as an example, a redline shift would be from 6500 rpm to ~4100 rpm, and if you compare the segment of the torque curve you traverse to, say, the one you'd see shifting at 5500 rpm to ~3500 rpm, the latter keeps you in a much stronger torque ("power") band for the final few seconds. Similar considerations apply to the 2-3 shift and even to higher gears, to a lessening extent. The only time short shifting the A10 would hurt performance is if it caused an extra shift to occur during a given distance run, but I'm pretty sure this doesn't happen in a quarter mile. I'll be happy to be corrected in my amateur back of the envelope "analysis" if it isn't sound, though.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
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12-29-2020, 09:42 AM | #7 | |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
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12-29-2020, 10:12 PM | #8 | |
Drives: 2017 Camaro 1SS M6 Join Date: Apr 2015
Location: Indy
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12-29-2020, 11:21 PM | #9 | |
Drives: 19 Chevrolet Camaro 2SS 1LE Shock Join Date: Apr 2020
Location: BC, Canada
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For most NA engines, normally you want to shift as close to redline as possible. The idea is that you want to upshift at a point that would give you more wheel torque(what includes torque multiplication of the gears in transmissions) in the higher gear at the lower RPM you shift to than the RPM you are currently at in the lower gear, unless you hit redline first, which is often the case with an NA engine.
Engineering Explained has a good video on this topic: With turbocharged engines, however, you can hurt acceleration by shifting at redline. This is because when the turbo starts to "choke" the engine at a higher RPM(especially if your turbo is small, or your factory tune is on the conservative side), your torque will drop off significantly and you are better off shifting earlier. There was an article that tested the 2.0T 1LE that observed exactly this. They actually achieved better 0-60 times by shifting at a lower RPM than running it all the way out to the redline. I would think a supercharged engine would be more similar to an NA engine, not 100% sure, though.
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12-30-2020, 10:07 PM | #10 | |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
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Quote:
Thanks UnknownJinX for the video link, this one I haven't seen yet .
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
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12-31-2020, 08:47 AM | #11 | |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
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12-31-2020, 09:39 AM | #12 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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When my car was stock I ran my best times manually shifting only because I could rev out 1-2 and 2-3. Stock they are programmed to short shift in the event of wheel spin so it stays off the limiter. Once you are tuned letting the computer shift is faster because there is some shift torque recovery settings that can not be adjusted in manual mode that actually make the car a tad slower.
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12-31-2020, 09:50 AM | #13 | |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
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01-01-2021, 01:57 PM | #14 | |
Drives: '20 ZLE Join Date: Jun 2020
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I always drive mine in Manual mode using HUD. Like most other racers here, I can't do WOT in 1st or 2nd. So, to answer your question, I pull the paddle around 6200 and it shifts varying amounts of RPM thereafter depending on the shift - 2/3, 3/4, etc.
My main objection to going WOT in Sport/Auto is the inevitable downshift is impossible to predict and cope with. Even a 4/3 downshift at WOT spins the tires. I'm a bit off topic here in that I have more hp and torque. Quote:
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OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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