I've talked to them over the phone on 2 occasions.. yeah.. they know their shizzle. when I'm ready to go FI, I'll be knocking on their door.

 

HP is a measure of power, torque is a measure of torque. If you have a high reving engine with low torque but high HP, then you have to stay in the upper RPM's so gearing can take advantage of torque. If you have a high torque motor with the same HP, the power band is usually in the midrange, and going out of the powerbad can put you out of power. This is like a few american engines. Theres a reason why they redline at 6000 or 5700rpm. After that, they just loose power. By simply changing out stock cams, you give ur self pwr at the expense of torque

 

Transplant a big block Chevy into your Z if you're that concerned about torque.

 

It's under the hood of an '06 Z06 Corvette.

 

Well, with more torque higher in the rev range, the engine would have even more HP.

You'd have to drive a diesel car like a VW to understand what I meant about "poor driveability". Some diesel engines will red line at 4,500rpm. So the HP number is always lower than the peak torque. They work very well, but not for long (rpm wise).

We can view the situation from many angles (and we are, this is a nice topic by the way :-) ). For our Z, we are pretty much limited with the car's final drive. Having tons of torque at 4,400 rpm would be useless since you'd just be doing burnouts at 80mph. (okay, that would be fun) My point is, 100lb more or less won't make a difference once you brake traction.

Like Starchecker said, the setup you've shown is probably running a small enough turbo to limit lag, but too small to maintain boost at high rpm. It's not fun when the nose drops down way before red line because you're loosing torque. It's purely subjective because you'd still be going fast. But it wouldn't feel fast. Not like when you red line your Z now.

I'm not sure I'm making sense...

 

Small turbos, good tuning, and an excellent designed turbo kit that JWT has come up with.

NOTE: We have noticed Torque and WHP to be similiar up to around 10 PSI, after that, torque defintely exceeds WHP as much as 10-20%.

Yes, I said that correctly. Torque exceeds WHP as much as 10-20% after 10 PSI using the BB530 and BB700 turbos.

And BTW, I owned a ZO6, the car had less than 400 WHP, yet with 400 ft/lbs it moved through the gears amazingly. This is how and why we use the JWTs roadracing, they are perfect to simulate powerful V8 torque.

Goodluck.

M

 

that's what I'm talking about! thanks for chiming in. very cool site you got going on, too.

 

Thanks.

PM if you need any help.

M

 

Well said.
One more point that I see brought out on the forum is the VQ specs, two VQ engines, one with 287 Hp and one with 300 Hp, both have different peak torque. 300Hp has a flatter Tq curve than the 287Hp one, so its more usable over a wide rpm range even though the 287Hp engine has higher peak Tq.