question about 95 GTs

Unit 5302 · 01-27-2002, 01:47 PM

andy669, I'll cut you some slack, hehe. What you don't know about Killercanary's setup, is how he got to where he is. He was running low 15's stock. Before the EEC tuner, he ran a low 13 with the AFR's and most of his current combo in place on the stock SN95 computer

.

If you are arguing math based on your personal impressions for maximum trap speed with 4.10's, it sounds pretty weak to me. But just in case the gear ratio calculators are incorrect, let's do some math.

5500rpms 3rd gear in AOD-E 1.00:1. Rear end ratio 4.10:1. Stock tire size 245/45 17.

So let's start by doing the tire diameter. 245x.45 = 110.25 x 2 = 220.50 / 25.4 = 8.6811". 17 + 8.6811 = 25.68"

Circumference = 2 x pi x (25.68/2) = 80.68"

Wheel revolutions per minute: Now the engine is spinning at 5,500rpm. Since the transmission ratio is 1:1 in 3rd gear, that means the driveshaft is spinning 5,500rpm as well. Now, the rear end ratio is 4.10:1, meaning the wheels are spinning 5,500 / 4.10 = 1341.46rpm.

Mph = 1341.46 x 80.68 / 12 / 5280 x 60 = 102.49mph.

If the rear end ratio is truely 4.10:1, the car has stock sized dire diameter, and the transmission ratio isn't false, 5,500rpms HAS to equal 102mph.

Sorry, but a tachometer can be incorrect, the math cannot be.

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01-27-2002, 01:47 PM	#19
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	andy669, I'll cut you some slack, hehe. What you don't know about Killercanary's setup, is how he got to where he is. He was running low 15's stock. Before the EEC tuner, he ran a low 13 with the AFR's and most of his current combo in place on the stock SN95 computer . If you are arguing math based on your personal impressions for maximum trap speed with 4.10's, it sounds pretty weak to me. But just in case the gear ratio calculators are incorrect, let's do some math. 5500rpms 3rd gear in AOD-E 1.00:1. Rear end ratio 4.10:1. Stock tire size 245/45 17. So let's start by doing the tire diameter. 245x.45 = 110.25 x 2 = 220.50 / 25.4 = 8.6811". 17 + 8.6811 = 25.68" Circumference = 2 x pi x (25.68/2) = 80.68" Wheel revolutions per minute: Now the engine is spinning at 5,500rpm. Since the transmission ratio is 1:1 in 3rd gear, that means the driveshaft is spinning 5,500rpm as well. Now, the rear end ratio is 4.10:1, meaning the wheels are spinning 5,500 / 4.10 = 1341.46rpm. Mph = 1341.46 x 80.68 / 12 / 5280 x 60 = 102.49mph. If the rear end ratio is truely 4.10:1, the car has stock sized dire diameter, and the transmission ratio isn't false, 5,500rpms HAS to equal 102mph. Sorry, but a tachometer can be incorrect, the math cannot be.