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Gear Change #1656505
08/08/14 05:36 PM 08/08/14 05:36 PM
Joined: Dec 2005
Posts: 252
St.Louis, Mo.
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mokid Offline OP
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Been doing a little bench racing with a fellow racer about my rear gear set up I currently run a 5.13 car 60ft at 1.24 goes through traps at 8200 rpm I ran it by Strange Tech they said if I went to a 4.88 my MPH would go to 156 MPH but would lose 60ft time, My question is would this 156 MPH equate to a lower E.T while losing 60ft time.
Re: Gear Change [Re: mokid] #1656506
08/08/14 07:49 PM 08/08/14 07:49 PM
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Romeo MI
MR_P_BODY Offline
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Whats the engine and the car... need specs
Re: Gear Change [Re: MR_P_BODY] #1656507
08/08/14 11:41 PM 08/08/14 11:41 PM
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St.Louis, Mo.
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mokid Offline OP
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small block R3 W8 830 HP car weight 2830 LB we launch at 5200 RPM go thru trape at 8200 RPM
Re: Gear Change [Re: mokid] #1656508
08/08/14 11:53 PM 08/08/14 11:53 PM
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Romeo MI
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Quote:

small block R3 W8 830 HP car weight 2830 LB we launch at 5200 RPM go thru trape at 8200 RPM



I trap at the same rpm but use a 4.56 gear(this is
with my W-9 405ci)... I think your turning more than
the peak HP by more than the 10% that I like to run
Re: Gear Change [Re: MR_P_BODY] #1656509
08/09/14 01:26 AM 08/09/14 01:26 AM
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St.Louis, Mo.
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mokid Offline OP
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What are you 60 ft. I was surprised Strang said if I went to a 4,89 my MPH would go to 156,
Re: Gear Change [Re: mokid] #1656510
08/09/14 01:45 AM 08/09/14 01:45 AM
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western Ky
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Whats your mph now with the 5.13'S?
Re: Gear Change [Re: mokid] #1656511
08/09/14 01:48 AM 08/09/14 01:48 AM
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Romeo MI
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Quote:

What are you 60 ft. I was surprised Strang said if I went to a 4,89 my MPH would go to 156,



Best is 1.19... normal is 1.20-1.21
Re: Gear Change [Re: CraigS] #1656512
08/09/14 09:50 PM 08/09/14 09:50 PM
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St.Louis, Mo.
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149 MPH at 8300 rpm
Re: Gear Change [Re: mokid] #1656513
08/09/14 10:11 PM 08/09/14 10:11 PM
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Romeo MI
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Quote:

149 MPH at 8300 rpm



Is it still pulling good at that rpm.. I think my
engine was running out at 8200 and 152.. I was thinking
about going 4.30s but I sold the engine and have to use
my back up and run slower(only aloud to run 10.0 now
due to health)
Re: Gear Change [Re: MR_P_BODY] #1656514
08/09/14 11:13 PM 08/09/14 11:13 PM
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St.Louis, Mo.
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mokid Offline OP
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I believe its at it peak maybe a little more in it,
Re: Gear Change [Re: mokid] #1656515
08/09/14 11:41 PM 08/09/14 11:41 PM
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Romeo MI
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Quote:

I believe its at it peak maybe a little more in it,



I just dynoed my on a chassis dyno so the best I could
figure is it made peak HP at 8000 and I went through
the traps at 8200 but it seemed like it was out of
power before that.. thats why I wanted to try the 4.30s
but if you have a engine dyno sheet that says you make
peak at 7900 or so you should be in the park
Re: Gear Change [Re: MR_P_BODY] #1656516
08/10/14 12:46 PM 08/10/14 12:46 PM
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St.Louis, Mo.
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mokid Offline OP
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Yes our dyno sheet does shoe peak at 7900
Re: Gear Change [Re: mokid] #1656517
08/10/14 01:18 PM 08/10/14 01:18 PM
Joined: Jun 2003
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Romeo MI
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Quote:

Yes our dyno sheet does shoe peak at 7900



Just a guess here but you could be running out of power
like I think I was and the lesser gear might help..
but if your torque curve is falling off like mine, then
I think a lesser gear could help.. just a guess
Re: Gear Change [Re: MR_P_BODY] #1656518
08/10/14 06:57 PM 08/10/14 06:57 PM
Joined: Dec 2005
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St.Louis, Mo.
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mokid Offline OP
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I will check data logger on that torque curve, Thanks

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