Estimate how fast I was going.

BanginStang97GT · Sep 12, 2004

I was in 5th gear at around 5,800 rpms. I have 3.73's. My speedo was pegged but I have no idea how accurate it is at that speed. Thanks, Kev-

Jason94gt · Sep 12, 2004

id guess 130 ish

trinity_gt · Sep 12, 2004

BanginStang97GT said:
I was in 5th gear at around 5,800 rpms. I have 3.73's. My speedo was pegged but I have no idea how accurate it is at that speed. Thanks, Kev-

Hmm. Well, from first principles:

T45, 5th gear = 0.67:1 (I think)
Driveshaft RPM = 5800 / 0.67 = 8656.7RPM
Axle RPM = 8656.7/3.73 = 2320.8RPM
Assume wheel diameter of about 26" (2.17'); C=6.807

MPH = 2320.8(r/min) * 6.807(ft/r) * 1/5280(mile/ft) * 60(min/hr)

MPH = 179.5MPH.

Something isn't right. Either I've got the wrong gear ratio for 5th, the tire size is wrong, my calcs are wrong or your tach is wildly off. I don't think a car that manages 94MPH in the 1/4-mile has a 180MPH top-speed.

CanadaStang · Sep 12, 2004

1/2 of 5800 rpms is 2900rpm. Check how fast you are going at 2900rpms,then double it[if your 70mph at 2900rpm, then at 58000rpm you would be going 140] Should give you a good idea.
My 98' with 3.27 gears will do 132mph, using a GPS [same reading as speedo]

highvolts · Sep 12, 2004

This will solve it for ya

http://www.tchracing.com/tech/gearcalc.php

krly79 · Sep 12, 2004

177 mph is your ideal mph without factoring in wind resistance. I would say somewhere around 160ish probably, give or take 5mph.

1992 2.3LX · Sep 12, 2004

Jason94gt said:
id guess 130 ish

if he had it pegged i sure hope his speedo isn't off by that much.

CdnNavybob · Sep 12, 2004

krly79 said:
177 mph is your ideal mph without factoring in wind resistance. I would say somewhere around 160ish probably, give or take 5mph.

Ummm, sorry but no. Stock 99+'s won't exceed 145. Those Mods on a 97 wouldn't get it that fast, then you have add the shorter gears...

I'd say 130 would be a best case scenario, but that's just a shot in the dark.

nickthegenius · Sep 12, 2004

Somehow I just don't believe that a car with your mods would pull to 5800RPM in overdrive.

Even with the power a stock LS1 has compared to an NPI boat anchor, my '99 and '01 Formulas had to make top speed runs in 5th because they couldn't pull in 6th gear.

highvolts · Sep 12, 2004

Jason94gt said:
id guess 130 ish

What does the 97 speedo go to? My 03 GT goes to 150

87gn2 · Sep 12, 2004

nickthegenius said:
Somehow I just don't believe that a car with your mods would pull to 5800RPM in overdrive.

Even with the power a stock LS1 has compared to an NPI boat anchor, my '99 and '01 Formulas had to make top speed runs in 5th because they couldn't pull in 6th gear.

but your 6th gear is like .05

twogts4us · Sep 12, 2004

Going that fast on a public road is just stupid. Please tell me you were on a closed track...?

Jesus · Sep 12, 2004

I have gone 137 with my mods. I cant remember the RPM's, but I remember thinking this car could definately go 150 if I kept on it.

FallenPhoenix · Sep 12, 2004

CdnNavybob said:
Ummm, sorry but no. Stock 99+'s won't exceed 145. Those Mods on a 97 wouldn't get it that fast, then you have add the shorter gears...

I'd say 130 would be a best case scenario, but that's just a shot in the dark.

The 3.73s would increase his top speed in this situation

BanginStang97GT · Sep 13, 2004

My mod list is vague my biggest of the mods a vortech s-trim, steeda boost pipe, snow performance meth. inj kit and im hittin around 10lbs of boost. I just haven't felt like updating my sig. I have pics if anyone has there doubts. So with that being said what's my est. speed?

70stangcoupe · Sep 13, 2004

I've been 145 (on the speedo) in my near -stock 97, and it was in 5th gear.

StngStr · Sep 13, 2004

Ah....the blower makes things a little different.

trinity_gt · Sep 13, 2004

BanginStang97GT said:
So with that being said what's my est. speed?

The mods don't matter: if you've got the motor and the aerodynamics to actually turn 5800 in 5th gear with 3.73s, you'll be moving at about 179MPH.

GTvert01 · Sep 13, 2004

What size tires are you running?

cronin49 · Sep 13, 2004

Please, give me a break! If you where turning 5800rpm in 5th with 373's, you were running about 175 mph! That ain't gonna happen in a Mustang GT!

Estimate how fast I was going.

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