trying to figuare out if my gearing will be close (rpm) wise

Go down

trying to figuare out if my gearing will be close (rpm) wise  Empty trying to figuare out if my gearing will be close (rpm) wise

Post  5pointslow on July 31st 2018, 2:15 pm

Not sure if anyone can help or has some input

car made 649 Hp at 6400 rpm
weighs 2900lb with me

1.76 gear powerglide
28x10.5 slick

4.10 gears

i have a gut feeling i have to much gear , but not sure and want to address before going 2 hours away to track
I plan on running 10.00 and 10.50 index using the ez plate under the carb ( slowing car up )

10.50 index i feel will be around 130 plus/minus 5 mph
Any help would be greatly appreciated , not sure if there was an accurate calculator for this
5pointslow
5pointslow

Posts : 1271
Join date : 2009-10-11
Age : 30
Location : MASSHOLE aka BOSTONIAN

View user profile

Back to top Go down

trying to figuare out if my gearing will be close (rpm) wise  Empty Re: trying to figuare out if my gearing will be close (rpm) wise

Post  5pointslow on July 31st 2018, 3:28 pm

1/4 mile
5pointslow
5pointslow

Posts : 1271
Join date : 2009-10-11
Age : 30
Location : MASSHOLE aka BOSTONIAN

View user profile

Back to top Go down

trying to figuare out if my gearing will be close (rpm) wise  Empty Re: trying to figuare out if my gearing will be close (rpm) wise

Post  69F100 on July 31st 2018, 4:13 pm

I think you should be able to run the 1/4 with the 4.10 gears. I had 4.30 gears in mine with 1.76 glide with 29.5 X 13.5 tires crossed the 1/4 around 6700 mine with me in it is 2940
69F100
69F100
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 5185
Join date : 2009-01-04
Age : 52
Location : Irwinville Ga.

View user profile

Back to top Go down

trying to figuare out if my gearing will be close (rpm) wise  Empty Re: trying to figuare out if my gearing will be close (rpm) wise

Post  stanger68 on August 1st 2018, 10:06 pm

The auto math handbook has a lot more writing on this topic than I could ever share in a post here but, The formula for overall gear ratio for automatic trans is (tire dia/335) X (rpm/mph) standard trans replace the 335 with 340. I highly recommend that book for any gearhead. Using this formula you have to know what your target trap rpm would be.


mph=cubed sq.route of (hp/weight) x 234


stanger68

Posts : 318
Join date : 2015-12-05
Location : Birmingham, Al

View user profile

Back to top Go down

trying to figuare out if my gearing will be close (rpm) wise  Empty Re: trying to figuare out if my gearing will be close (rpm) wise

Post  whitefield on August 2nd 2018, 6:58 am

Should be close with the 4.10 ! The 4.10 gear you will probably have to turn it about 6700 to 6800 rpm through the traps. 3.80 or 3.90 gear would work great should be around 6500 rpm through the trap . If your going to spray it 3.70 or 3.50 gear. 1/4 mile . Just my opinion based on my setup
whitefield
whitefield

Posts : 2230
Join date : 2009-08-23
Age : 51

View user profile

Back to top Go down

trying to figuare out if my gearing will be close (rpm) wise  Empty Re: trying to figuare out if my gearing will be close (rpm) wise

Post  5pointslow on August 3rd 2018, 9:36 am

whitefield wrote:Should be close with the 4.10 ! The 4.10 gear you will probably have to turn it about 6700 to 6800 rpm through the traps. 3.80 or 3.90 gear would work great should be around 6500 rpm through the trap . If your going to spray it 3.70 or 3.50 gear. 1/4 mile . Just my opinion based on my setup


i can live with 6700-6800 rpm


i will have to just try it and see
5pointslow
5pointslow

Posts : 1271
Join date : 2009-10-11
Age : 30
Location : MASSHOLE aka BOSTONIAN

View user profile

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum