I found a program called CarTest where you enter car-specific data and it will generate different results. For example, it will generate Standing Start Acceleration results, Rolling Start Acceleration results, Horsepower and Torque Curves, etc. The product I used was pretty old (last copyright was in 1998), but there might be an updated version. If anyone sees any settings that I should change, please let me know. Here are the results for a '07 G35x (this does not account for the top speed limiter):

2007 G35X
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CAR SPECIFICATIONS

Engine Displacement: 3498 cc.
Engine Location: FRONT
Engine Type: NORMAL
Engine Max Horsepower: 306 bhp
@: 6800 rpm
Engine Torque: 268 lb-ft
@: 4800 rpm
Compression Ratio: 10.6 :1
Maximum engine speed: 7600 rpm
Start Engine Speed: 900 rpm
with Clutch: BRAKE TORQUE
Transmission Type: AUTOMATIC
Number of Gears: 5
Gear Ratio 1st: 3.84 :1
Gear Ratio 2nd: 2.35 :1
Gear Ratio 3rd: 1.53 :1
Gear Ratio 4th: 1.00 :1
Gear Ratio 5th: 0.84 :1
Gear Ratio 6th: :1
Final drive ratio: 3.69 :1
Driving wheels: REAR
Car test weight: 3704 lb.
% weight on front wheels: 53 %
Wheelbase: 112.2 in.
Tire section width: 225 mm.
Tire circumference: ft.
Wheel diameter: 17 in.
Tire profile: 55 %
Coefficient of drag: 0.29
Frontal area: sq.ft.
Overall height: 57.8 in.
Overall width: 69.8 in.
Ground clearance: 5.1 in.


GENERAL PARAMETERS

Air Temperature: 65 deg. F.
Barometric Pressure: 29.38 in. Hg.
Relative Humidity: 55 %
Elevation above Reference: 0 ft.
Headwind (+), Tailwind (-): 0 mph
Road Grade (+=Ascend, -=Descend): 0 %
Shift Time, Manual: 0.50 sec.
Shift Time, Auto: 0.30 sec.
Engage Time, Manual: 0.20 sec.
Engage Time, Auto: 0.10 sec.
Clutch Slip Max. Time, Manual: 5.00 sec.
Brake Release Time at Start, Auto: 0.10 sec.
Trans. Engage Method-Lin,Prog,Regr: R
Shift@O=Optim,R=Redline,D=Driver,P=Prog: O
Engine Free Decel Rate: 2000 rpm/sec
Engine Bog Down Decel Rate: 4000 rpm/sec
Engine Wheelspin Decel Rate, Manual: 500 rpm/sec
Engine Clutch Slip Decel Rate, Man.: 250 rpm/sec
Engine Trans. Slip Accel Rate, Auto: 750 rpm/sec
Engine Wheelspin Accel Rate, Auto: 250 rpm/sec
Max. Coefficient of Static Friction: 1.00
Max. Coefficient of Kinetic Friction: 0.85
Coefficient of Rolling Resistance: 0.013
Tire Expansion Factor: 0.020 %/mph
Hot Tire Pressure: 35 p.s.i.
Tire Tread to Section Width Ratio: 90.0 %
Wheel and Tire Weight: 45 lb.
Minimum Engine Speed: 700 rpm
Zero h.p. Engine Speed: 600 rpm
Turbo Start Speed: 3000 rpm
Max. Torque Conv. Slack Until, Auto: 2000 rpm
Low Max. Brake Torque Speed, Auto: 2000 rpm
Time Increment: 0.05 sec.
Start Time after Car Moves: 1.00 ft.
Mechanical Losses-Auxiliaries: 2.00 %
Mechanical Losses-Manual Trans.: 6.00 %
Mechanical Losses-Auto Trans.: 8.00 %
Mechanical Losses-Differential: 4.00 %
Mechanical Losses-Axles & Shafts: 5.00 %
Mechanical Losses-Torque Converter: 3.00 %
Max. Clutch Slip Losses, Manual: 10.00 %
Max. Trans. Slip Losses, Auto: 15.00 %
Max. Torq. Conv. Torque Multiplier: 2.25
Effective Engine Radius: 3.0 in.
Drive Shaft Radius: 1.0 in.
Center of Gravity from bottom: 30.0 %
Graphics Aspect Ratio (EGA): 0.75
Graphics Aspect Ratio (VGA): 1.00
Sound Effects (Y=Yes, N=No): N


STANDING START ACCELERATION RESULTS

Starting vehicle speed: 0 mph
Starting engine speed: 900 rpm
Starting gear: 1st

Optimum Shift Points:
1st 7600 rpm @ 43 mph
2nd 7600 rpm @ 71 mph
3rd 7560 rpm @ 109 mph
4th 6710 rpm @ 149 mph

Time to Speed:
0- 30 mph............ 2.1 sec.
0- 40 mph............ 2.9 sec.
0- 50 mph............ 4.5 sec.
0- 60 mph............ 5.7 sec.
0- 70 mph............ 7.2 sec.
0- 80 mph............ 9.6 sec.
0- 90 mph............ 11.8 sec.
0-100 mph............ 14.3 sec.

Time to Distance:
0- 100 ft............ 3.1 sec.
0- 500 ft............ 7.9 sec.
0-1320 ft.(1/4 mile). 14.4 sec.
@ 100.2 mph

Top Speed............. 160.1 mph


The 1/4 mile time seemed in line with some times listed in this forum. I was wondering what you all thought of this and could it be useful in any way to determine what the effect of a mod could be?

 

I dunno, they are claiming 0-60 in 5.2 for the new sedan, 5.7 seems high.

 

I thought so to, but I saw some times posted by others (https://g35driver.com/forums/showthr...ighlight=track) and the 1/4 mile seemed right on with their times.

 

I think a lot of people who are tracking it, may still be in break in or have just gotten done with it.

Plus, they may not be able to drive either, hehe.

 

I agree.. Too many other variables for the 1/4 mile times.
Engine also needs 15K miles on it to really loosen up.