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Old 11-27-2012, 01:22 PM   #1 (permalink)
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Shift points for Elise and Exige S 240

The latest proActive magazine from Lotus Engineering has a fascinating article about the differences in performance between an electric Evora 414e Hybrid with 6 speed combustion powered Evora S.

Proactive Magazine | Lotus Cars

At first, on paper, it appears the electric car with maximum torque at zero revolutions will be significantly faster. Adding in a bunch of factors shows the internal combustion engine will be the primary propulsion for years to come. The article included a bunch of torque curves and shift points for the Evora.

Long ago, after putting my Elise on the dyno and gathering the torque figures, I created a chart that shows where the optimum shift point are. No, you are not fastest when shifting at the red line rather you should shift where the torque any given gear crosses to the next gear. The shift lights in the 2008 and newer instruments help.

Lotus Elise Information, Shift Points, Chart

Can some kind person please send me some actual dynamometer runs for the Exige S 240? I will be happy to create the chart showing the optimum shift points.

You respond with a private message or find my real email on my website, contact listed at the bottom of the index on the page listed above.

thank you,

Michael

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Old 11-27-2012, 04:04 PM   #2 (permalink)
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From what I understand, you are supposed to shift so that the next gear lands in the heart of your torque so that you keep accelerating as quickly as possible
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Old 11-27-2012, 04:58 PM   #3 (permalink)
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shift points optimized for Acceleration? Most of the SC cars dynos I have seen are pretty much linear all the way to redline (implied Constant tq). I think this implies redline is the optimum shift point to maximize acceleration.
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Old 11-27-2012, 06:37 PM   #4 (permalink)
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Nod, the Katana 265 kit produces torque which climbs with RPMs; peak torque is at redline.
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Old 11-27-2012, 07:37 PM   #5 (permalink)
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This always becomes a big debate, but Michael is absolutely right. For maximum acceleration, you need to keep the torque AT THE WHEELS at maximum, which must be evaluated through looking at the gear ratios, the engine's torque curve, and the road speed, just as he's shown on his web page. The optimal point is different due to variations in the combination of these three variables for different cars. It's pretty easy to evaluate with the car's information and Excel.
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Old 11-27-2012, 08:25 PM   #6 (permalink)
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Certainly newton would agree to maximize torque at the wheels to maximize acceleration. I believe that if the hp curve always has a positive slope (as is the case for most sc dynos I've seen here), this will be achieved by shifting at redline.

This is not the case for cars that have tq curves that fall off at higher rpm

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Old 11-27-2012, 10:18 PM   #7 (permalink)
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While I see what they're doing, they had me at "mass correction".
Someone care to break it down?

I did some googling and found these:
note: 220.8 PS = 217.78 hp



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