yup its gonna be fast but also weird dynoing on one roller!
The LE5 never made more than 177HP and 173 ft/lbs. The LAF/LEA were rated at 182HP but those had direct injection which it appears the Slingshot does not. Hope that clarifies where the missing HP is, if you go on wikipedia you can search for "ecotec" and find the info for the various versions of the engine.I found this a tad interesting. GM says this engine has 182 hp @ 6,700 rpms. So why is Polaris publishing the horsepower ratings that the engine produces at only 6,200 rpms? The 9 "missing" horsepower is probably not missing at all. Just rev it 500 more rpms. Same goes for the torque figures. GM says 172 lb-ft @ 4,900 rpms. Polaris says 166 lb-ft @ 4,700 rpms. The "missing" 6 lbs are in the 200 rpms not being used. The dyno graphs clearly demonstrates this. Also I found interesting is that Polaris published that they're using a rev limiter that kicks in at 7,000 rpms.......... so that means that the whole rev range and capabilities of the engine is available in the Slingshot! Another thought I entertained was a little power loss while transferring the final drive from shaft>belt>tire. But that still doesn't explain the lower rpm rating. I feel pretty confident stating that this is a 180 horsepower machine. (Maybe 182! Like the manufacturer reports)
I think the issue is that it isn't the LEA 2.4 motor but the LE5 which makes a little less hp/tq and is not direct injected. The LEA has 182 but the LE5 made between 169-177 depending on the vehicle it was in.I found this a tad interesting. GM says this engine has 182 hp @ 6,700 rpms. So why is Polaris publishing the horsepower ratings that the engine produces at only 6,200 rpms? The 9 "missing" horsepower is probably not missing at all. Just rev it 500 more rpms. Same goes for the torque figures. GM says 172 lb-ft @ 4,900 rpms. Polaris says 166 lb-ft @ 4,700 rpms. The "missing" 6 lbs are in the 200 rpms not being used. The dyno graphs clearly demonstrates this. Also I found interesting is that Polaris published that they're using a rev limiter that kicks in at 7,000 rpms.......... so that means that the whole rev range and capabilities of the engine is available in the Slingshot! Another thought I entertained was a little power loss while transferring the final drive from shaft>belt>tire. But that still doesn't explain the lower rpm rating. I feel pretty confident stating that this is a 180 horsepower machine. (Maybe 182! Like the manufacturer reports)
What do you mean?I am sure that garbage pail looking muffler on the SS isn't helping matters either.
Noah, when looking at that muffler and seeing all the rivets on the front side, I am thinking that is a cathlitic converter and muffler combo and is not very effective.What do you mean?
The bigger a muffler, the less restrictive it is.
Not true, at all. For example, a bullet style muffler is barely larger than the diameter of the incoming and outgoing pipes, and is the least restrictive muffler design there is. Lots of science goes in to exhaust design, and OEM and aftermarket design goals are different. If they weren't the aftermarket wouldn't exist.What do you mean?
The bigger a muffler, the less restrictive it is.