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Old 05-07-2001, 04:08 PM   #1
Nick
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The other night I had my car going about 5300 rpms on over drive. Now i am not for sure about my final drive ratio but at 60 in 5th I am pulling about 1900 rpms. I still have the factory size 225/60r15. Does any body have a clue as to how fast I was going and what my axle ratio is?

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Old 05-07-2001, 07:08 PM   #2
mike g
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you have 3.73 gears

and you were going around 160mph
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Old 05-07-2001, 11:17 PM   #3
speedy_stang
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Quote:
Originally posted by mike g:
you have 3.73 gears

and you were going around 160mph
Hmmmmm, 160 MPH with 373's? Personally, I don't know if a car with 373's could get up to 160 MPH if it was dropped off a cliff.

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Old 05-07-2001, 11:24 PM   #4
mike g
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5300rpm in overdrive(.667 is the overdrive gearing) is 160mph

edit: i just noticed something he said 5th gear, but then he said being in overdrive and i did his gearing for an aod. so it will be alittle off if he has a t-5 since fifth gear is .675

[This message has been edited by mike g (edited 05-07-2001).]
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Old 05-08-2001, 01:59 AM   #5
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Thats scary because i have H speed rated tires. I have a theory though, couldn't higher gears raise top speed because it allows to use more of 5th gear. Oh yeah, it was a really long stright road to.

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Old 05-08-2001, 11:20 PM   #6
Joe92GT
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Yes, higher gears do allow a higher top speed because 5th becomes usefull. Especially if the mustang is making more power than stock. But 160 is pretty scary in a near stock stang, now I don't know what suspention work you have done or anything.

------------------
92 Mustang GT
Mods: World Products Windsor Sr. Heads, B303 cam, GT-40 intake, 70mm throttle body, 75mm mass air, MAC fenderwall induction, long tube headers, high flow cats, MAC catback, tremec 3550, 3.73 gears, auborn locker.Mac upper and lower rear control arms, lowering springs, 12 degrees timing. 250 HP, 294 Ft/lbs at rear wheels
Best time: 13.7 @ 103.1 MPH
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Old 05-11-2001, 01:29 AM   #7
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I have Cobra Calipers and Kyb Shock and struts. The car was shuddering pretty bad.
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Old 05-11-2001, 03:35 AM   #8
mike g
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what are h rated tires rated to like 95 or something like that?
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Old 05-11-2001, 02:22 PM   #9
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132 mph
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Old 05-11-2001, 02:56 PM   #10
Dan the Man
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I don't know how fast you were going, but to figure out your gears do the following:

1)Jack up the car so the wheel are off the ground.

2)Get under the car and using a chalk mark the driveshaft and a point of reference on the differential.

3)Now still under the car mark the tire and a reference point inside fender.

4)Spin the tire one full rotation as you count how the number of driveshaft rotations. Almost 3 is 2:73, 3 and a bit, 3:08, 3 and a half 3:55, you get the idea.

Oh, don't forget to disengage the e brake and put it in neutral



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Old 05-28-2001, 06:59 AM   #11
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Tire speed ratings are determined for a four hour test. So driving "H" rated tires up to 160mph is not exceding the speed rating, as long as you don't do it for longer than four hours.
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Old 05-30-2001, 01:23 AM   #12
1o1PRooF
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If im not mistaken my old 2.73s ran about the numbers you posted. I do remember 2000rpm @ 80mph, check it and see.
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Old 05-30-2001, 08:29 PM   #13
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http://members.tripod.com/Mr5oh/327.html

Check this out, looks like you might have 327's

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Old 05-30-2001, 09:21 PM   #14
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Snake, that page doesn't take into account wheel/tire combos. Are those calculations with stock 225/60HR15s or 225/55HR16s?

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Old 05-30-2001, 11:22 PM   #15
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stock 225/60 /15"s I believe I saw in there somewhere.
I'm running 225/60/15's and 308's and the gear charts are right on for me.

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