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Discussion Starter #1
Heading out to Las Vegas for the big reveal tonight of the 2020 Polaris Slingshot. Hopefully we will get to see the new engine, verify an automatic transmission and some of the other changes. I will be taking as many pictures and videos as I can and get them posted up. Let me know if there is anything you want to know or picture of and I will see what I can do
 

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Some brief reactions:
-I sat in the cockpit and it is a 1,000% improvement. Stock steering wheel is great and might kill the market for aftermarket wheels. Seats are supportive. Dashboard display much bigger, brighter, and easier to read. The one I sat in had the auto trans.
-The form factor remains largely unchanged.
-Only heard from a video but the new engine sounds nice, deep and growly exhaust notes.
-Overall fit & finish strikes me as a giant leap forward, esp. compared to my '16.5.

Go SS!
 

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From the descriptions I've read, I wonder if the AutoDrive capability can be retrofit to the original manual transmission and, if so, would it be cheaper than transplanting a conventional automatic trans? Ideally, I'd like to keep the manual stick shifter, but also have automatic operation when I want it.
 

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Discussion Starter #9
Some brief reactions:
-I sat in the cockpit and it is a 1,000% improvement. Stock steering wheel is great and might kill the market for aftermarket wheels. Seats are supportive. Dashboard display much bigger, brighter, and easier to read. The one I sat in had the auto trans.
-The form factor remains largely unchanged.
-Only heard from a video but the new engine sounds nice, deep and growly exhaust notes.
-Overall fit & finish strikes me as a giant leap forward, esp. compared to my '16.5.

Go SS!
the new engine also felt smoother than the current Ecotec. Like you said the interior is much improved, they did a great job with the new gen.
 

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After watching some videos on youtube, the new model sounds much better! Was hoping to see support for CarPlay, etc. But might not be possible. Also was looking for powered side mirrors. Everything else looks like nice steps forward! From little details like the flat bottom steering wheel, the stress cracks on the side when getting in and out should be hopefully gone to a new engine and better interior and layout!
 

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Discussion Starter #13
After watching some videos on youtube, the new model sounds much better! Was hoping to see support for CarPlay, etc. But might not be possible. Also was looking for powered side mirrors. Everything else looks like nice steps forward! From little details like the flat bottom steering wheel, the stress cracks on the side when getting in and out should be hopefully gone to a new engine and better interior and layout!
In person the new engine did sound really good, even stock and it was definitely smoother.
 

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While i am curious to to test drive once my local dealer gets one in stock, I'm rather curious if an add-on like a Pedal Max or similar might rectify possible issues with the new transmission setup
 

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Discussion Starter #15 (Edited)
When Polaris introduced the new Prostar 2.0L engine and mentioned the horsepower numbers, they did sound really good, but we did see a reduction in peak torque from the previous 2.4L. Once the new engine specs were posted on the Polaris website after the reveal, they also posted up the new transmission gear ratios and the new final drive ratios and that's when we started to notice some important changes Polaris made.

Once we saw these changes, it became pretty obvious to us that although the engine would make less torque, we were going to see a faster Slingshot.

To start the comparison, we used one of the base 2.4L Ecotec dyno graphs GM has posted over the years that shows peak horsepower and torque. We put that information into a spreadsheet that multiplies the engine power by the gear ratios of the transmission, final drive and also takes into account the rear tire diameter. We plotted that information for all 5 gears on a graph, shown in red below.

Next we needed to generate the same data for the the new Prostar 2.0L engine, but there is no actual dyno posted yet from Polaris. No problem, Polaris was good enough to give the peak torque and horsepower figure and what RPM's they occur. Knowing both of those figures, it is pretty easy to interpolate between them to make a nice smooth graph. That took care of the RPM range above peak torque, below the peak torque figure, we had to estimate the torque the engine is making. Although we did estimate the new engine torque below peak, we feel but came up with something that should be fairly accurate based on how other engines making similar Horsepower and torque behave.

The new Prostar 2.0 engine was plotted on the graph below in black. You will see that each gear is indicated by a different line same as the Ecotec. This graph shows the 2.4L Ecotec and the 203HP Prostar -

A couple takeaways from the graph data -

- The new engine will not have the same torque at the wheel as the current Ecotec in the lower RPM's of 1st, 2nd and 3rd gears. However those are relatively low speeds and under full throttle, the time spent in this area of the graph will be pretty minimal. Also, typically the rear tire can not maintain traction at these speeds in these gears, so even though the Ecotec has more available power in this range, the Slingshot is typically traction limited here so even though the Ecotec has more power, the rear tire will determine the actual acceleration.

- Once the Ecotec reaches peak torque and starts to drop off in power, the new engine keeps accelerating. Not a big surprise here since the new engine seems to be designed to make its power more in the upper RPM range.

- Once the Slingshot is in 4th or 5th gear, because of the new transmission and final drive ratio's, the new Slingshot will out accelerate the Ecotec. Even with the engine making less torque, because of the gear multiplication, there is more power available at the actual tire than before, especially while cruising in 4th or 5th gear.

- The new Slingshot will be electrically limited to 125mph from Polaris, but it will also have a lower actual top speed also because of the shorter gearing of around 185mph at the stock redline, compared to well over 200mph with the older gearing. Not that this really matters for most everyone, but thought it was fun to note.


DDMWorks Polaris Slingshot Acceleration 2020 vs 2019 .JPG
 
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