degradated

Some of you may have seen this already, but if not - check it out.


Please right click, save as.
http://www.lexushp.com/videos/Chris%...61%20Supra.mpg

You might need this Codec to view the video:

http://www.elecard.com/ftp/pub/mpeg/.../EMpgDec20.zip

(I had to reboot after downloading this and the video for it to work)

It's a video (sort of dark but you can still tell what's going on) between a T61 Supra and a sport 500 turbo 300zx. Basically the supra is putting out 40 more peak hp, but the 300 is putting out ~75 more ftlbs torque peak. Figure the 300zx is about 50-100 pounds heavier than the supra (estimate).

It's interesting that even though the supra has more peak power, the 300 stays right with him the whole time. And is it just me or does the supra start getting pulled ever so slightly at the very top (right before he let off and the other car zoomed by)? I believe they took it from 65-155.

Here are the dyno charts:

Chris' 300zx plotted with speed on the x axis:


Chris' 300zx plotted with RPMs on the x axis:


Paul's supra plotted with speed on the x axis:


Paul's supra plotted with RPMs on the x axis:



Maybe this helps to show that peak horsepower isn't always the most important aspect of acceleration.

Now keep in mind, these cars are not exactly equal. Different gear ratios, different coefficient of drag, but their weight is very similar and they are both ~3 liter turbo engines each running at 19 psi, so it's a pretty good comparison IMO.

bretx0r

thats weird, inline motors usually make more torque than V motors.

degradated

I've heard just the opposite.
It's not just that, but it's also the fact that the Z has sport 500s which are very small turbos (same size housing as stock), compared with the Supra running a significantly larger turbo which is more efficient at higher RPMs but suffers worse turbo lag. Naturally, if you are making more torque down low than up top, your peak torque numbers will be higher than peak hp numbers.

I Like Boost

Torque ownz, thats why i went 84mm on my block

Speedy Gonzalez

Area under the curve, that's all. Forget about peak HP or torque #.

degradated

Right. Well, as long as the peak numbers aren't spikey, they give a general indication of what kind of area under the curve you have. It's just easier to label a car by it's peak #'s, then post the dyno so people can actually see the curves which are hard to put into words.

Kamin

horsepower is just a measure of torque over time

hp is for top speed
torque is for low end.

so theoretically, the supra would beat the Z in the top speed/high rpm, not have the Z pulling on the supra at the end.

SiRkid

its a decent comparo but the other factors play big roles!!!
of course generally more torque is what you would like though.
but for a fwd honda.... too much torque and too soon is no good!


[Modified by SiRkid, 3:37 AM 1/9/2003]

Full-Race Javier

is he using a JWT ecu?