starting line gear ratio? - Page 3

rod · 08-29-2021, 04:29 PM

guys, thanks for the input. the charts are very neat. very possibly the Dick Miller 11.25 # was with a torque converter [didnt say in the book] and when you ad in torque multiplication, it changes everything.
with mine,as is, at 13.69, its high from Miller and low for both the 2 charts. however, I will rather be under geared than over reved at the stripe. plus I could just gain more MPH if the engine will continue to pull.

have to wait till Thanksgiving to run at Vegas [that just sucks-every track in the country is runnin' except Vegas]
Thanks again, all.
Rod in AZ

Mike Rietow · 08-29-2021, 08:45 PM

Quote:

Originally Posted by GUMP

You get my vote for "Clueless Post Of The Year".....

It was a copo with a 409cid LS. The explanation may not be up to your standards, but at least I understand the announcer when he says "this is a copo.

68/ss · 06-29-2023, 05:43 PM

Need Help,2350# 15x33 tire,6.20 rear gear. going stick racing with G-Force 2000,Ram billet Clutch as reccomended by Mike @ Ram. tranmission is coming from G-Force with 3.167 1st,2.148 2nd,1.576 3rd1.250 4th 1.000 5th according to my calculation SLR of 19.63 ,engine makes 850@8750 and peak torque 595@6500 is this too much SLR ?

GTX JOHN · 06-30-2023, 02:30 AM

That sounds like a lot to me in that light a
racecar and that HP!

Mike Gray · 06-30-2023, 10:44 AM

Quote:

Originally Posted by GTX JOHN

That sounds like a lot to me in that light a
racecar and that HP!

I’m thinking 4.56

Stan Weiss · 06-30-2023, 12:17 PM

Yes that seems very high.

Without changing anything, I would think it would like launching in 2nd much better than 1st gear.

Stan

James Hensler · 07-02-2023, 05:32 PM

Hey guys do the math for me and tell what you think.
987 Hp
5.83 rear gear
2.81 1st gear G force 2400
3200 lbs
33 x14.5 Goodyears
Really don’t want to go over 9500 but I can in 4th if I have to

Stan Weiss · 07-02-2023, 08:36 PM

Quote:

Originally Posted by James Hensler

Hey guys do the math for me and tell what you think.
987 Hp
5.83 rear gear
2.81 1st gear G force 2400
3200 lbs
33 x14.5 Goodyears
Really don’t want to go over 9500 but I can in 4th if I have to

► 5.83 * 2.81 = 16.3823

Looks good to me. That is just about 1% different than I calculate as a good starting place.

Stan

08-29-2021, 04:29 PM	#21
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 307 Likes: 0 Liked 17 Times in 13 Posts	Re: starting line gear ratio? guys, thanks for the input. the charts are very neat. very possibly the Dick Miller 11.25 # was with a torque converter [didnt say in the book] and when you ad in torque multiplication, it changes everything. with mine,as is, at 13.69, its high from Miller and low for both the 2 charts. however, I will rather be under geared than over reved at the stripe. plus I could just gain more MPH if the engine will continue to pull. have to wait till Thanksgiving to run at Vegas [that just sucks-every track in the country is runnin' except Vegas] Thanks again, all. Rod in AZ

06-29-2023, 05:43 PM	#23
68/ss Junior Member Join Date: Apr 2011 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Re: starting line gear ratio? Need Help,2350# 15x33 tire,6.20 rear gear. going stick racing with G-Force 2000,Ram billet Clutch as reccomended by Mike @ Ram. tranmission is coming from G-Force with 3.167 1st,2.148 2nd,1.576 3rd1.250 4th 1.000 5th according to my calculation SLR of 19.63 ,engine makes 850@8750 and peak torque 595@6500 is this too much SLR ?

06-30-2023, 02:30 AM	#24
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,530 Likes: 2,222 Liked 1,809 Times in 572 Posts	Re: starting line gear ratio? That sounds like a lot to me in that light a racecar and that HP! __________________ John Irving 741 Stock 741 Super Stock

06-30-2023, 12:17 PM	#26
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 607 Likes: 0 Liked 545 Times in 291 Posts	Re: starting line gear ratio? Yes that seems very high. Without changing anything, I would think it would like launching in 2nd much better than 1st gear. Stan

07-02-2023, 05:32 PM	#27
James Hensler Member Join Date: Apr 2022 Location: Noblesville,In Posts: 107 Likes: 6 Liked 57 Times in 35 Posts	Re: starting line gear ratio? Hey guys do the math for me and tell what you think. 987 Hp 5.83 rear gear 2.81 1st gear G force 2400 3200 lbs 33 x14.5 Goodyears Really don’t want to go over 9500 but I can in 4th if I have to __________________ SS/AH 328X