ZW99GT

Ben, you are comparing our 200-300 hp TQless wonders to huge high revving V8's or V10's. When you have 600hp, you don't NEED gearing. Your power can push you through the gears.

You are I are riding around with mid 300rwhp, and we do NEED some help getting through the gears.

Sxynerd

Nope, I'm not even exagerating 1 mph. Burried past 150 on the I80 and the dyno was 168 in 4th gear. Remeber I have 2:73's.

Mustang_NTriangle

Ilove my 4.10s for the power and grunt only thing I wish is that I could get more speed out of each gear. If I could do it all over I think I would go with 3.55 gears and a blower. Only good thing is w/ 4.10s I will be able to have my car in boost readily available.

01snake

gear's dont affect your top speed. if it does not much

some guy on svtperf. gps'd at 165 with minor bolt on's and 4.30's. also did a i believe 175 downhill.

tbirdscwd

Wind resistance will not allow our cars (at least without significantly more hp) to reach their maximum speed our gears will let us go. In fact with a little lower gears our cars can probably have a little better top speed in 5th because we will be at higher rpm (thus making more power) when the wind resistance really comes into play.

Sxynerd

They affect your thoretical top speed. But if your engine can't rev then you can't reach the same top speed.

A 4.10 car at 6000 rpm will be at 111mph in 4th and a car with 2.73's will be 167.8mph so it does affect speeds. Speeds with Overdrive or 5th is 4.10= 167 and 2.73= 251mph

Those numbers are a big difference if you ask me.

Check the calculator yourself.
http://www.allfordmustangs.com//Detailed/635.shtml

cliffyk

There's no aerodynamic drag on a dyno, so speedometer readings from that experience are irrelevant to most discussions...[/align][/align]It takes 210 HP or so to push a 94+ Mustang GT to 150mph (here's my HP versus speed calculator), so it's entirely likely that sxynerd can hit 150+ in 4th with his 2.73 gears. Probably quite smartly to as he'll be coming up right through the meat of the powerband--150 mphwould beright around 5500 rpm (speed versus gear/gears calculator).[/align][/align]In 5th gear the 2.73s wouldhurt top speed as 150 mph wouldsee the enginedown around 3700 rpm, where there's no wayit would be capable of making the required 210 HP--probably more like 160 to 170 max which would only be enough to push the car to 135/140 with the pedal to the metal...[/align][/align][/align]

Sxynerd

If I’m not considering Air speed friction or thermodynamics, my question is; Does the calculators stay accurate for true "engine" characteristics? Or is it merely an algorithm based on estimation of numbers inputted for tire height and rpm's?

ben790450

Zack i can always count on your to put it out there plain as day and make sense of it all in a simple way. Thanks bro. And you and everyone else are right. We drive underpowered muscle cars. They're meant to be low reving, heavy and have deep gears. Supercars are a totally different animal. High revving, lightweights, and tons and tons of power

Quicktime_GT

When I had 3.27s before the blower the car would pull pretty good up until the top of 4th gear then it would pull 5th gear reallllly slow...

With 4.10s I believe it would run faster top end than it would with 3.27s just because it wouldn't hardly pull the higher gear...

Now with the supercharger it pulls hard until about 135.. I've had it to about 140 and believe it will bury the hand, but after 135 it gains slow...