Weight vs gearing?

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hemisport5.7

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Just curious out there if anyone knows the weight difference on a single cab 5.7 hemi and a crew cab? Who would win in a 1/4 race a single cab with 3.21 vs a crew with 3.92 gearing stock for stock? Thoughts?
 

WilliamS

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That would be a good race, are these both 8 speeds? I think the cab and seats is about 500 pounds in terms of weight, vs the 22% mechanical advantage. I think the 8 speed will equalize that gearing on the long run it would be close. I dont know, I think I would call it to the regular cab. Man maybe not.
 
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hemisport5.7

hemisport5.7

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That would be a good race, are these both 8 speeds? I think the cab and seats is about 500 pounds in terms of weight, vs the 22% mechanical advantage. I think the 8 speed will equalize that gearing on the long run it would be close. I dont know, I think I would call it to the regular cab. Man maybe not.

Ya both trucks having the exact same transmission and engine, just the gearing difference and cab size. Would 500lbs be that much more noticeable on a truck? I know it's really noticeable on cars.
 

crash68

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I'd say the 3.92, it should get off the line quicker and I doubt you'll run out of rpms by the end of the track. There is a bit more of a chance of spinning the **** outta the rear tires even if the truck has a LSD.
 

huntergreen

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i'll just wait for the results of the race.
 

liftedgm1982

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Thought I read somewhere the weight difference between Reg cab and crew cab is ~1000lbs. Don't quote me. I'd take the Reg cab in that race.


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hemisport5.7

hemisport5.7

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Thought I read somewhere the weight difference between Reg cab and crew cab is ~1000lbs. Don't quote me. I'd take the Reg cab in that race.


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I haven't been able to find the exact numbers but I'm leaning on the reg cab as well for the win. I'm not sure if it's a 1,000lbs lighter though. But then again wouldn't the frame be slightly shorter not to mention less exhaust components and of course the cab size?
 

liftedgm1982

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I haven't been able to find the exact numbers but I'm leaning on the reg cab as well for the win. I'm not sure if it's a 1,000lbs lighter though. But then again wouldn't the frame be slightly shorter not to mention less exhaust components and of course the cab size?



Yeah most definitely. The doors alone I would guess weigh at least 50lbs a piece. It all adds up quick. Let's say it's only 500lbs more, that's still a significant amount of weight to haul in a race.


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WilliamS

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I think the old school race math is each 60lbs you can shave off a car was equivalent to 1hp. So if its a 1000 pound difference, then the extra nearly 20hp in weight alone, the transmission will equalize the power band once off the line. Im going regular cab at this point.
 

oe542bob

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I recently traded MY15 RCSB Sport/Rambox/3.92LSD
Weight = 4891lbs.
PS: This truck was a blast to own and drive

Purchased a MY16 CC Laramie Longhorn/6.4'Rambox/3.21LSD
Weight = 5532lbs.
I would bet my $$ on the RCSB in the 1/4, even though it has the 3.21s
Just less weight to get moving
This would also depend on any wheel spin, but I'm ignoring that aspect, let's say both would launch equally as far as tire hookup
As far as my trucks, the Hemi has plenty of power, but I certainly wish I had the 3.92LSD in my CC.
 

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I always thought accepted RCSB weight as being 5300 lbs.
Might be including driver but I'm unsure.
 
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hemisport5.7

hemisport5.7

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I recently traded MY15 RCSB Sport/Rambox/3.92LSD
Weight = 4891lbs.
PS: This truck was a blast to own and drive

Purchased a MY16 CC Laramie Longhorn/6.4'Rambox/3.21LSD
Weight = 5532lbs.
I would bet my $$ on the RCSB in the 1/4, even though it has the 3.21s
Just less weight to get moving
This would also depend on any wheel spin, but I'm ignoring that aspect, let's say both would launch equally as far as tire hookup
As far as my trucks, the Hemi has plenty of power, but I certainly wish I had the 3.92LSD in my CC.

Where did you get your numbers from? 640lbs seems like a close figure on weight difference.
 

oe542bob

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Where did you get your numbers from? 640lbs seems like a close figure on weight difference.
I realize that I should have cited my source. In PA, on our yearly registration cards, it shows unladen weights. That is where I found those numbers.
The state uses those weights to determine registration class. As the weight goes up past certain levels, you pay more.
 
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RLJ10X

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My numbers came from the scale down the road.

I'd like to have a RCSB, 8 speed. Just not bad enough to spend $37,000, or what ever they're up to now days.
 
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