So I was looking at the chart below on Stillen's website [regarding how much power each stage of the Stillen SC adds to each of the two 2005 G35C engines] and was wondering why there's such a large gap between the torque and hp of the two engines [with SC installed] when their normal hp [without a SC installed] is quite small.

For example, the engine in the 2005 6MT has 298 hp which is 6.4% higher than the 280 hp the 5AT coupe from the same year has. But with a Stage 3 Stillen SC installed, the 6MT engine produces 12.1% more torque than the engine on the 5AT....almost twice the ratio of their horsepower difference. A couple of questions:

-Why is there a greater difference between the engines' torque than their horsepower? Is the 6MT engine designed better in some other way (i.e. it produces its peak torque at a higher RPM)?

-Is the torque difference (which is a bigger difference than the horsepower difference) more indicative of the car's performance, particularly acceleration (assuming you negate the gearing/transmission) than the hp difference?

Thanks in advance.
-------------------------------
280HP VQ35DE Engines

STAGE 1 - 369 hp / 305 lbs/ft Flywheel
STAGE 2 - 382 hp / 313 lbs/ft Flywheel
STAGE 3 - 410 hp / 339 lbs/ft Flywheel

298HP VQ35DE Engines

STAGE 2 - 390 hp / 360 lbs/ft Flywheel
STAGE 3 - 410 hp / 380 lbs/ft Flywheel

 

It has to do with the transmission, not torque converter. You loose more through the 5AT trany than the 6MT. Plain and simple, the 6MT is more efficient.

 

6MT engines are different (05+). They rev higher and have more top end power.

They also have slightly less torque.

Peak torque and peak hp numbers are not a *VERY* accurate measure of performance.

 

Please dont buy that kit as i should know.

 

What should I look for then?

 

Agreed... not a great kit for the money.

.