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Author Topic:   R P M s
Dirt Forum Racer

Total posts: 94
posted March 29, 2001 08:42 PM
what kinda rpms do you turn
what size of track
auto or manual?
gear ratio[3rd gear 3.73s]etc.etc.

Dirt Roller

Total posts: 17
posted March 30, 2001 07:24 AM
got a couple of differnt gear setups for bombers on 1/4-3/8 mile : 241 rear gear with low gear in a 350 turbo about 6500rpms 607 final gear , 342 rear gear with a 176 low gear powerglide 5500 to 6200 rpms 601 final gear ,389 rear gear with second gear in a turbo 350 591 final gear (nice gear for slick track ) had a team mate try a 410 with second gear in a turbo 350 623 final gear
worked good on a small 1/4. too much for a big 1/4 or 3/8 .going to try a 256 in low on a 350 turbo for a 1/5 mile flat track ex-go cart track (stock motor) has any one tried this or do you guys think it will work. may try enduros at this track

Dirt Maniac

Total posts: 165
posted March 30, 2001 11:46 PM UIN: 54865418
i run on 1/2 and 4/10. pretty much stock engine set up just cam change using a t350 in 2nd gear and a 10 bolt rear end w/308 gear i run a 79 roll tire on the half and about a 74-76 on the 4/10. it will turn about 58-6000 rpm witch is right on my cams power band

Dirt Forum Racer

Total posts: 94
posted April 15, 2001 09:41 PM
thanks for your replys: iwas just trying to get a good topic started to see what everybody is doing around the country if ya dont try new stuff you get left in the dust right? always trying to be on the cutting edge!!!

Dirt Maniac

Total posts: 148
posted April 17, 2001 06:32 PM
Gear ratios are also dependent on tire roll out.We ran a 7.94 final on a medium 1/4 mile
and a 7.56 on a long 1/4 with an 89 inch tire roll out. We tried to keep RPM's about 7200 to 7500. We have also run an 8.19 final on the first mentioned track ( a little much)


Dirt Newbie

Total posts: 3
posted April 18, 2001 02:15 PM
Tight 1/4 Track
Manual (3spd Saginaw)
1.89 2nd Gear w/ 3.73 rear= 7.04 Final

Dirt Roller

Total posts: 19
posted May 27, 2001 06:54 PM
we run a 3/8 mile with a standard saginaw 3 speed tranny and run a 5.83 for dry slick tracks and a 6.00 for a heavy track.

Dirt Freak

Total posts: 239
posted May 28, 2001 09:52 AM UIN: 25419780
on a half mile I only turn 5800rpm on a 1/4 mile 4800..I run a gm standerd 3speed (I use in it high gear) with a 538 rear in a gm ten bolt with 82 to 89 tire roll out.I do pretty good at most tracks..

Dirt Full Roller

Total posts: 74
posted May 29, 2001 01:23 PM
3.70 gear on a 1/2 mile track
I run 82" IMCA tires.
I run 4th gear on dry slick at @4200 RPM and 3rd gear for a heavy track @5400 (4.74 total gear in 3rd).

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