Did lotus rob us on horsepower?

[Tracked Emira]

This is a dyno I'm using to show that Lotus is not accounting for their claimed 400 horse power because I am not able to shift past 6,500 RPM. If I was able to go to the originally claimed maximum 6,800 RPM then the motor would unleash another 15 to 20 minumum horsepower.
If this is true then their claim of this 400 horsepower should be reduced to what the car actually puts out at the maximum RPM in the newer cars with automatics.
Brands have gotten sued over this and you have to spend a minumum of $1,500 with an upgraded intake or $2,500 for an exhaust system to gain that back based on the linear curve.
They should at least change their claims. My friend who just got the turbo says his goes to 7,200 RPM.

 

[seriously]

Autos have a lower rev limit?!

 

[Eagle7]

Keep in mind that chart shows the power to the rear wheels, which also shows how much drivetrain loss there is. The factory power rating is always what the engine is delivering at the crank, before going through everything in between the crank and the rear wheels. The amount of power that's absorbed by all those components is the drivetrain loss.

As you can see, the drivetrain loss on my car completely stock (this dyno chart was from my project journal thread) was 30 hp; only 370 hp out of the 400 was making it to the rear wheels. For the stock baseline run, the difference between 6500 and 6800 rpm is only 10 hp to the rear wheels which isn't much, and you're only going to see that increase above 6500 rpm

My car is the V6 with manual trans. If you're driving an automatic, the drivetrain loss is going to be different.

 

[chirowolf]

Was always under the impression that the engines are dyno out of the car in optimal conditions (like a crate motor) as Eagle 7 stated HP numbers do not reflect drivetrain losses.

 

[Jinba ittai]

Yeah. All manufacturers quote hp at the crank rather than wheel hp.

 

[Tracked Emira]

I'm talking at the crank, just using the dyno information as a guide to show what is lost in horse power between 6,500 and 6,800 RPM
It takes about $1,500 to gain every 10 hp in this motor. Whether it's a tune at $6000 to gain 40 hp or an intake at $1,500 to gain 15. Even shedding 181.8 lbs will only gain me about 10 hp, according to this Motortrend article on A Civic Si with the driver that weighs about the same as the Emira. So to shave 150 lbs with Ap racing rotors, GRP forged monoblock wheels, 2 Tillett seats, Antigravity battery, titanium lug bolts, an intake and a titanium exhaust system will cost over $15,000 to not even acheive this calculated 10 hp gain.
Granted, shaving this much weight will also help in handling as well as improving quarter mile time, which is more important than 10 hp.
It wouldn't be an issue if it didn't cost so much to extract each 10 hp, which is why even 10 hp is so important with the Emira.

 

[Jinba ittai]

Not to be an ass, but I think you bought the wrong car. This car is more about the qualitative elements than chasing numbers.