top speed with 3.73?

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Dec 20, 2004 | 04:32 PM

z28boysteve

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From: Houston

top speed with 3.73?

My buddy claims that his 3.73s I put in are killin his top speed, says he went 120 at 5,000 !? wtf, claims car will only go 140, shouldnt it go about 168 at 6500?

Dec 20, 2004 | 05:15 PM

flyinZ

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From: IL

The last high speed run I had, we figured it up and I was doin' about 145-150 at almost 5.5k.(i think) My speedo only says 110, so we had to figure it up on a speed calc.

Dec 20, 2004 | 05:23 PM

AnthonyConstant

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what gears do you recommend for an Automatic, that i plan on supercharging, its stock now

Dec 20, 2004 | 05:27 PM

flyinZ

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From: IL

How much highway driving do you do? Are you worried about mileage?

Dec 20, 2004 | 06:00 PM

Ls1LikeNoOther

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With a 3.73 and my forged 355 lt1 I topped out the LT1 Speedo and it kept pulling,not too high in the R's either.

Dec 20, 2004 | 06:45 PM

96capricemgr

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with a 4L60E 26" tire 7% TC slip and the 3.73s 5000rpms would be 138mph
5500 would be 152

Dec 20, 2004 | 10:41 PM

TwoFast4Lv

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From: LT1 land...the "409" of the 90s!

I can still peg my speedo(correctly calibrated)

With the blower I would go for 3.42

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Dec 21, 2004 | 03:44 AM

AnthonyConstant

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Quote:

Originally Posted by flyinZ

How much highway driving do you do? Are you worried about mileage?

nope i could care less about milleage, and i do a fair amount.

Dec 21, 2004 | 12:37 PM

#10

Dexter93

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Mine gets up to 130mph at 5000rpms and the I let off.

Dec 22, 2004 | 04:30 PM

#11

Formula96

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From: Longview, TX

i have a video of my car saying 155 on the speedo but that was calibrated for 3.23s. It didn't have much gear left...

Dec 23, 2004 | 09:57 PM

#12

Gloveperson

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There is a spreedsheet someone made for our cars that allowed you to enter your car, tire size and gear ratio. Anyone have that? That would answer this question with 100% accurate math.

Dec 24, 2004 | 06:57 AM

#13

z28boysteve

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From: Houston

oh I already figured it out with a calculator, 168 at 6,400 RPMs, OD with 7% converter slip......he dont beleive me though says he was goin 120 at 5000 that cant be right, especially with stock converter, oh, and his tires are low profile, only 24" tall

Dec 24, 2004 | 03:59 PM

#14

Mikey 97Z M6

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From: Vancouver, WA

I've used this calculator before: http://www.juric.org/mopar/tools/topspeed.php

I've had my car up to 5900rpm (Autometer tach read off the MSD) in 5th gear (.74 ratio) and with the 315/35/17's I had on it, it calcs out to be 178mph and it was still pulling slowly in 5th gear. I ran out of freeway though and I was getting a bit leary winding out the stock shortblock for that amount of time. Car was dead solid at speed though, I was impressed with the stability. I've gone 150 in my friends C4 and it felt really 'floaty' and made me nervous.

Mike