Top Speeds in Different Gears (6MT)

PeterSellers · 10-21-2009, 11:36 AM

Quote:

Originally Posted by 370Zsteve

Resistance from the air will flatten those numbers as speed increases in 5th and 6th. The Z has nice drag coefficient spec, nonetheless physics will take over eventually.

Not exactly. Air resistance does not affect a car's theoretical top speed in any gear. The top speed in any gear is only a function of engine speed, gearing and final drive (and wheel size I suppose). This is all assuming the car has the power to reach those speeds.

schnabdt · 10-21-2009, 02:30 PM

PeterSellers, that explanation sounds right to me. I have to doubt the z will do 195 as JoeD stated. Unless it's modified and a new transmission which makes this thread very unspecific.

JoeD · 10-21-2009, 02:49 PM

Quote:

Originally Posted by schnabdt

PeterSellers, that explanation sounds right to me. I have to doubt the z will do 195 as JoeD stated. Unless it's modified and a new transmission which makes this thread very unspecific.

195 MPH is the theoretically calculated top-speed based on gearing, tire-size, and the engine's redline. Not taking into account the tire's expansion at that speed, 7500 RPM in 6th-gear works out to 195 MPH.

I never said the car will get to that speed.

But a TechnoSquare re-flash with an 8100 RPM fuel-cut will get you to 210 MPH in 6th at that RPM.

JoeD · 10-21-2009, 02:40 PM

Quote:

Originally Posted by PeterSellers

Not exactly. Air resistance does not affect a car's theoretical top speed in any gear. The top speed in any gear is only a function of engine speed, gearing and final drive (and wheel size I suppose). This is all assuming the car has the power to reach those speeds.

Exactly.

kannibul · 10-21-2009, 02:41 PM

Quote:

Originally Posted by PeterSellers

Not exactly. Air resistance does not affect a car's theoretical top speed in any gear. The top speed in any gear is only a function of engine speed, gearing and final drive (and wheel size I suppose). This is all assuming the car has the power to reach those speeds.

+1, though, aerodynamics do play a HUGE part in it.

Take a Mustang GT500 and a Corvette. Mustang will throw all it's power into pushing air over what is basically a brick with wheels, vs the Corvette slipping through the air somewhat like a wing. End result, Corvette is faster.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
$5 Million Lawsuit Charges Apple With Fraud Over 3G Speeds	AK370Z	The Lounge (Off Topic)	10	01-11-2011 07:03 PM
Gears and Coffee car show - Sacramento 10/25	g37mobbin	Northern California Region	1	10-21-2009 12:56 PM
370 Z AT with Sport package and shifting speeds	casaforte9	Nissan 370Z General Discussions	5	10-13-2009 10:52 PM
Skipping Gears with SRM	MJM33067	Nissan 370Z General Discussions	9	08-16-2009 10:26 AM
Close ratio gears?	tvfreakazoid	Engine & Drivetrain	24	01-30-2009 03:44 PM

10-21-2009, 02:30 PM	#2 (permalink)
schnabdt Base Member Join Date: Apr 2009 Location: Nashville Posts: 15 Drives: 09 370 SPT TRG MB M6 Rep Power: 18	PeterSellers, that explanation sounds right to me. I have to doubt the z will do 195 as JoeD stated. Unless it's modified and a new transmission which makes this thread very unspecific.