100 lbs.

outlaw · 06-24-2021, 10:37 PM

Always been told lose a 100 pounds pickup a tenth in the 1/4 if so what is it worth in the 1/8 mile? Also if running a 5.83 gear in the 1/8 what gear is needed to turn same rpms in the 1/4 finish line?
Terry

Ralph A Powell · 06-25-2021, 08:11 AM

We did a lot of 1/8 and 1/4 in early 70s with a manual 1/4 speed. Found that we ended up with the same gear ratio in rear. I would just stretch 3 rd gear out in 1/8 could run 1/8 with just 2 shifts.

Chris Hill · 06-25-2021, 01:58 PM

If 100 pounds is worth 0.1 sec in 1/4 mile, it's worth 0.06 in the 1/8 mile.

outlaw · 06-25-2021, 05:49 PM

Thanks for the replies. Figured it should pickup about whatever it was worth by the 1/8 but wasn't sure.
Terry

rod · 06-27-2021, 07:45 PM

I know a lot of old 1/8 mile guys who ran 6.00+ gears. but with old 4 speeds, I thinks the time shifting [between gears] cost them.

in my car, when running a 4 speed and a 5.67, streeeeetching 3rd netted better ets, than running a 6.20 and hitting all 4 gears.
maybe with the new very high dollar clutchless 4 speeds, it would take a lot of data logging to know. 6 to 7 seconds happens real fast.
Rod in AZ

06-24-2021, 10:37 PM	#1
outlaw Member Join Date: Aug 2008 Posts: 137 Likes: 78 Liked 132 Times in 52 Posts	100 lbs. Always been told lose a 100 pounds pickup a tenth in the 1/4 if so what is it worth in the 1/8 mile? Also if running a 5.83 gear in the 1/8 what gear is needed to turn same rpms in the 1/4 finish line? Terry

06-25-2021, 08:11 AM	#2
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 387 Likes: 2 Liked 225 Times in 136 Posts	Re: 100 lbs. We did a lot of 1/8 and 1/4 in early 70s with a manual 1/4 speed. Found that we ended up with the same gear ratio in rear. I would just stretch 3 rd gear out in 1/8 could run 1/8 with just 2 shifts. Last edited by Ralph A Powell; 06-25-2021 at 08:48 PM.

06-25-2021, 01:58 PM	#3
Chris Hill Senior Member Join Date: Jan 2002 Posts: 655 Likes: 8 Liked 244 Times in 26 Posts	Re: 100 lbs. If 100 pounds is worth 0.1 sec in 1/4 mile, it's worth 0.06 in the 1/8 mile. __________________ Chris Hill https://ihmusedparts.com

06-25-2021, 05:49 PM	#4
outlaw Member Join Date: Aug 2008 Posts: 137 Likes: 78 Liked 132 Times in 52 Posts	Re: 100 lbs. Thanks for the replies. Figured it should pickup about whatever it was worth by the 1/8 but wasn't sure. Terry

06-27-2021, 07:45 PM	#5
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 313 Likes: 0 Liked 20 Times in 15 Posts	Re: 100 lbs. I know a lot of old 1/8 mile guys who ran 6.00+ gears. but with old 4 speeds, I thinks the time shifting [between gears] cost them. in my car, when running a 4 speed and a 5.67, streeeeetching 3rd netted better ets, than running a 6.20 and hitting all 4 gears. maybe with the new very high dollar clutchless 4 speeds, it would take a lot of data logging to know. 6 to 7 seconds happens real fast. Rod in AZ