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Author Topic:   gear change ?
Speedway65
Dirt Freak

Total posts: 344
posted June 29, 2004 01:09 PM  
we run a metric car with 7.5 rear 3/8 mile high banked track.The problem is with our new motor we turn too much rpm 6700 to 6900.Th350 in 2nd gear with 4.10 ratio 82 inch tires .My question is motor guy says around a 5.80 but we can only get around a5.66 with 3.73 in 2nd.we want to turn around 6300 to 6400.
Any ideas?


racer17j
Dirt Forum Champ
Total posts: 5390
posted June 29, 2004 06:53 PM  
we run 2.41 in first with t-350

Speedway65
Dirt Freak

Total posts: 344
posted June 30, 2004 06:13 AM  
we are not limited to tire size and we run a TH350.The only thing is i want to run in second gear because the tranny is special if you know what i mean.

juliaferrell
Dirt Freak

Total posts: 370
posted June 30, 2004 12:59 PM  
3.73 will work fine. Yes 3.90 is probably optimal but if your gonna run second then that's about as close as you're gonna get. I like the 2.41 first gear setup. Just slower on starts.

racer17j
Dirt Forum Champ
Total posts: 5390
posted June 30, 2004 04:13 PM  
We run tonight so i will let you all know how it turns out!

Speedway65
Dirt Freak

Total posts: 344
posted July 04, 2004 04:56 PM  
Well ended up with 3.73 in 2nd with a 82 inch tire.Didn't get 6400rpm,got about 5900 to 6000.On the positive side the car was bad fast,its to bad we ran out of laps ended up finishing 2nd.I am really pumped about this change because i was a little worryied it wouldn't work!Well back to putting a new side on the car because we race against a lot of hammers.

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 04, 2004 09:48 PM  
July 16 we won the feature.we ended up turning 6100 rpm and the track still was tacky.

poorboy5792
Dirt Roller

Total posts: 17
posted July 21, 2004 08:16 PM  
I need a 3.73 for a street stock car 7.5 any one have one around the south carolina area? thanks in advance!!!!!!!!!

[This message has been edited by poorboy5792 (edited July 21, 2004).]

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 21, 2004 10:43 PM  
i have one in iowa 100 plus shipping for carrier with or without welded spider gears or 75 for just r/p

    

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