New C8 on a dyno - video-

[Tourmax]

Not sure if this has been posted, but you C8 "droolers" may enjoy it:



They did miss one possibility as to why it was higher HP than advertised: a "ringer".

Not saying that's what happened, just that it's a possibility. It wouldn't be the first time a manufacturer delivered a model to a magazine that has been "gone through" to make sure it's all to spec.

What (usually) ends up happening in that process is that the drivetrain gets "blueprinted".....which enables the assembly to achieve numbers a regular production version won't achieve. Its where the term "factory freak" comes from on some production cars: they're just put together "right" instead of being within production tolerances.

 

[pumpkinodin8844]

There are several people that already debunked the video. In summary there are screenshots of the actual data from the dyno and science apparently proves it not possible unless there are mods on the car not disclosed such as force induction. Obtaining 650 at the crank at 6500 rpm is not possible without force induction. The data suggests that the BMEP is 17.2 and the most efficient naturally aspirated engine is 13 and the current rating for the LT2 is actually 12.9 thus making the 17.2 BMEP not possible without forced induction. Chevy’s official SAE-certified power ratings, confirm the 12.9 and I trust there testing over this test that seems to be spreading very quickly on the net. One more thought is that if the numbers were true I'm pretty sure the first to brag about them would be the company selling the cars.

 

[Riley P]

Quite an insane number!!!! Heck, if the C8 put down 500 to the rear wheels, that would be awesome. However, as mentioned there are quite a few people who state that the '650' hp doesn't add up as the quarter mile trap speed would be higher, however, this makes for some excitement!

 

[Tourmax]

There are several people that already debunked the video. In summary there are screenshots of the actual data from the dyno and science apparently proves it not possible unless there are mods on the car not disclosed such as force induction. Obtaining 650 at the crank at 6500 rpm is not possible without force induction. The data suggests that the BMEP is 17.2 and the most efficient naturally aspirated engine is 13 and the current rating for the LT2 is actually 12.9 thus making the 17.2 BMEP not possible without forced induction. Motor trends dyno runs confirm the 12.9 and I trust there testing over this test that seems to be spreading very quickly on the net. One more thought is that if the numbers were true I'm pretty sure the first to brag about them would be the company selling the cars.

umm, the guy says in the video he's quoting the MT numbers.

Personally, I haven't seen it and have no skin in this game. I'm just reposting a video I ran across on youtube.

Wouldn't be the first time a manuf. has "dumbed down" the HP numbers though. Every OEM did in in the late 60's/early 70's to keep the insurance industry from charging super stupid rates on "musclecars". There were also "racing reasons" to underrate an engines output.....both to qualify a car in a class and to keep the competion guessing.

 

[Riley P]

Or the other one where the manufacturer would provide the rated hp of the engine that was recorded, but not inform anyone that their rating hp was 1500 rpm below the actual hp peak.

 

[pumpkinodin8844]

umm, the guy says in the video he's quoting the MT numbers.

Personally, I haven't seen it and have no skin in this game. I'm just reposting a video I ran across on youtube.

Wouldn't be the first time a manuf. has "dumbed down" the HP numbers though. Every OEM did in in the late 60's/early 70's to keep the insurance industry from charging super stupid rates on "musclecars". There were also "racing reasons" to underrate an engines output.....both to qualify a car in a class and to keep the competion guessing.

Sorry yes you are correct it was motor trend reporting the numbers and i should have reported that there’s no reason to call into question Chevy’s official SAE-certified power ratings.