well all...

i was just playing with a virtual Z in CarTest using most of the info from the C&D article...

(www.cartest2000.com)
What i changed: weight: 3188 lbs. per Jay.

I left every other measurement like C&D found (HP, torque, top speed/gear, gear ratios, Cd, height, width, track, etc).

This is what CarTest spit out:

Best 0-60: 5.42 with Clutch Dump at 1800RPM
Best 1/4mi: 14.10" @ 101.84 MPH
Top Speed: 165 MPH (gear limited)
SkidPad: .907 G's

What does this show? Well, it shows that the weight should HAVE been stated as 3188 lbs. (Which is what it is, right?)

And... the only way these numbers will be lower is if the car they tested did not have the final HP/torque. (IE, their car was 287/274... hopefully ours is higher...)

Michael

attached is data sheet:

 

here is the results:

 

Wow, good job. Thats pretty neat. If you got those numbers at 3188 lbs I don't see how it could weigh 3300+

 

I don't know if the Java version of CarTest2000 is the exact same algorithm as the MSDOS version but...

I noticed that CT2k for DOS defaults to a 0.5sec shift for manual transmissions. I imagine if you are power shifting you could shave that down a bit. Would 0.25sec be too aggressive of a shift? This might signify that C&D were doing easy shifts in their tests...

Also, the torque curve is just an approximation based off of two points (torque at 4800rpm and torque at 6400rpm). The real torque curve is going to be different. I know this is obvious to most of y'all but figured it was worth pointing out to those that start playing with the program.

It's a fun program to play around with. You can get the DOS version for free (really it's shareware) on their site. The Java version is prettier but I'm not sure what you get over the DOS version as far as functionality goes.

--
Jeff

 

Does it compute a different drivertrain loss for the carbon fiber driveshaft or does it not consider that. If it does not then the 3322 weight could be right for the preproduction with extra perceived power coming from the driveshaft getting more power to the wheels. Considering this, if the actual weight is 3188 then we will see better figures as suggested by JmanZ, SeedyRom and others.

-Mike

 

You can set the drivetrain loss to be whatever you want (buried in menus). At most, I think the carbon fiber would knock off a percentage point of loss. Probably wouldn't affect the results much.
--
Jeff

 

So, we do have to shift into 4th to finish the 1320, huh? That could very well explain the high trap, bad ET, couldn't it?

 

Running some more tests, and changing some parameters made some new findings...

Changes:
Manual shift time from .5 to .4 sec (read somewhere this is really acheivable)
Mechanical Losses from Axles and shafts from 5% to 4% (for carbon fiber... just a quess)

Recalc best launch to be clutch dump @1700 RPM...

0-60: 5.25s
1/4mi: 13.92 @ 103.10

I hope some of the other mags can get down to about this level (if not better )

michael

 

here is a comparison to "competition"

 

Third gear is going to KILL in traffic! HOORAY for TORQUE!

 

Wow! Finally, I get some torque. All I've had for the last 10 years is "talk".

 

WOW!

Those are some great looking numbers to me. This thing's gonna be a blast, and a breeze, to drive!

 

166 *drool*

not like I'd go that fast on a highway, officer. And I'm not suicidal yet either.

I think this car is going to get me to sears point very soon after I break it in.

 

SkiDaZZle, where did you find this program? Is it downloadable somewhere?

Thanks

Dan

 

That program isnt really accurate if you look at it.....It says the M coupe runs 13.8, when in reality it runs 13.1. Just a quick observation

 

ahahahaha...thanks VQ. I'm such an idoit. Just like a newbie sometimes.

 

To make people feel even better, CarTest does have conservative 0-60 and 1/4 mile times. Any way you set up the launch in that program it still sucks and will either roast the tires or the clutch for the first 50 feet or so. I'm sure when you get it to the track people will be out there pulling 13.7's or even quicker.

 

I like those numbers. You hit the nail on the head.

Could you simulate the Z if I modded it up a little say to 316 HP (10% increase)?

Also is temprature standardized? What temp? If it can be adjusted what kind of HP could we get at on a winter day??