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any gains going from 4.10 to a 4.30 gear #1188928
03/01/12 02:52 AM
03/01/12 02:52 AM
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Mt Morris Michigan
mopar dave Offline OP
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anyone have an ET gain going from 4.10 to 4.30 gear?

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188929
03/01/12 08:38 AM
03/01/12 08:38 AM
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Ringtown, Pa.
Dartsport540 Offline
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I run 4.30 and 4.10 gears. No difference in et. , only a 200 rpm difference at the stripe. I usually run 4.30 gears, and the 4.10 are my extra set.


548 cu. in., Bill Mitchell Aluminum Block, CRT 727 auto trans, Alston Chassis. 8.981et at 149.46 mph. 1.204et - 60 foot, So Far....
Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188930
03/01/12 09:31 AM
03/01/12 09:31 AM
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Ontario, Canada
Dodgem Offline
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You can expect to run about .76% faster if your at 12.000 should hall to 11.90
10.55 to 10.46


That is assuming it does not cause spin or run out of wind top end and all else stays the same!

Last edited by Dodgem; 03/01/12 09:34 AM.
Re: any gains going from 4.10 to a 4.30 gear [Re: Dodgem] #1188931
03/01/12 09:40 AM
03/01/12 09:40 AM
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east coast
Otherlane Offline
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Is there a rule of thumb for gear changing? like one member said he didnt get any ET but there is a 200 rpm difference.is it for every gear change so does 200 rpms?

Re: any gains going from 4.10 to a 4.30 gear [Re: Otherlane] #1188932
03/01/12 09:57 AM
03/01/12 09:57 AM
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Re: any gains going from 4.10 to a 4.30 gear [Re: Otherlane] #1188933
03/01/12 11:27 AM
03/01/12 11:27 AM
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NC
440Jim Offline
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Quote:

Is there a rule of thumb for gear changing? like one member said he didnt get any ET but there is a 200 rpm difference.is it for every gear change so does 200 rpms?


You can use the web calcs given above.
But the pure gear change equation is:

RPM1:RPM you run with gear set 1 (G1)
RPM2:RPM you run with gear set 2 (G2)
MPH1:MPH you run with gear set 1
MPH2:MPH you run with gear set 2

RPM2 = MPH2/MPH1 x RPM1 x G2/G1

For example,
If you run 130 MPH1 with 4.10 Gear1 at 7000 RPM1,
and if your MPH doesn't change, ie MPH2=MPH1, then:

RPM2 = 130/130 x 7000 x 4.30/4.10 = 7341

The question of if your MPH changes depends on your car's combo. Also, in some applications the converter slip will change; which changes RPM

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188934
03/01/12 11:33 AM
03/01/12 11:33 AM
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Ontario, Canada
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Back in the day gained about .170 going from 4.10 to 4.56 going from 11.5's to 11.3's. gained .2 more going 800 holley to 1050 Dom Holley!

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188935
03/01/12 12:38 PM
03/01/12 12:38 PM
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Trumbull,CT.
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jim sciortino Offline
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Quote:

anyone have an ET gain going from 4.10 to 4.30 gear?


To make a long story short, it's like most other things......

It's combination specific, as there are too many variables to make a definitive response. What works on one deal, may not on another.

It takes time and money to cycle parts and make calculated/accurate comparisons, but that's what it takes to sort out any combination.

Bottom line......try it and see what happens.

Re: any gains going from 4.10 to a 4.30 gear [Re: jim sciortino] #1188936
03/01/12 01:08 PM
03/01/12 01:08 PM
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Balt. Md
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To me its not worth it. You wont see much if any change. If I was going to change gears I would use a much more drastic change like 4.56 or 4.88. Now I may go from 4.30's that I run to 4.10's or 3.91's but thats because its a street car and if the performance is about the same I can drop my cruising rpm. Ron

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188937
03/01/12 03:21 PM
03/01/12 03:21 PM
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Bend,OR USA
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Quote:

anyone have an ET gain going from 4.10 to 4.30 gear?


My car, 518 pump gas stroker, 3450 lbs Duster, ran almost (within hundreds ands less than .25 MPH) the same with 3:73,3:91,4:10 and 4:30 Low tens at 128.+ MPH I do run the Mopar 2:77 low gear set in the trans so that may play into the results, the car usualy didn't spin no matter which rear gear was in it ,


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: any gains going from 4.10 to a 4.30 gear [Re: Cab_Burge] #1188938
03/01/12 03:58 PM
03/01/12 03:58 PM
Joined: Jan 2007
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Mt Morris Michigan
mopar dave Offline OP
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more good info guys, thanks. i cross the strip right on my peak hp at 6800 and i read somewhere you need to cross 300-500 above peak hp. a 4.30 gear would put me at 7200 according to wallace calc,
.

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188939
03/01/12 07:45 PM
03/01/12 07:45 PM
Joined: Nov 2003
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Mt.Vernon ,Ohio
VernMotor Offline
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My car was a touch faster with the 4.10 over the 4.30 I would of never thought that..

Re: any gains going from 4.10 to a 4.30 gear [Re: Cab_Burge] #1188940
03/01/12 09:39 PM
03/01/12 09:39 PM
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NC
440Jim Offline
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Quote:

My car, 518 pump gas stroker, 3450 lbs Duster, ran almost (within hundreds ands less than .25 MPH) the same with 3:73,3:91,4:10 and 4:30 Low tens at 128.+ MPH I do run the Mopar 2:77 low gear set in the trans so that may play into the results, the car usualy didn't spin no matter which rear gear was in it ,


Good example how different combos will respond differently. I had similar results with 3 gear ratios, 4.10, 4.30 and 4.56, the car didn't like high rpm and didn't need anymore torque multiplication at the start. Big torque motors with 3 speed auto transmissions may not be as sensitive as small cube/torque applications.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: any gains going from 4.10 to a 4.30 gear [Re: 440Jim] #1188941
03/01/12 10:22 PM
03/01/12 10:22 PM
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Sherman Texas
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The Shocker Offline
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Dont know about about 4.30 ,but i switched out the 4.10's in my Dart for 4.86 once,and that was the only change.My car lost a .05-.10 in the 1/8 and 3 mph with the 4.86's.The car 60 foots a mid 1.5 with either one.Im still trying to figure that out ,but i can say it seemed as though the 408 got lazy with the 4.86 gears and didnt spend enough time in low gear .It felt stronger on the hit of the throttle ,but that was it .I went back to the 4.10's ...


http://www.youtube.com/watch?v=ykcsXMV3vfg My Dart ,and im just getting started...
Re: any gains going from 4.10 to a 4.30 gear [Re: The Shocker] #1188942
03/02/12 10:09 AM
03/02/12 10:09 AM
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Pretty interesting...I would like to change the 4.88s out and go with a 4.30...


Need your rear end checked out? Contact Grizzly!!
Re: any gains going from 4.10 to a 4.30 gear [Re: tboomer] #1188943
03/02/12 10:31 AM
03/02/12 10:31 AM
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Quote:

Pretty interesting...I would like to change the 4.88s out and go with a 4.30...




why so much gear Ted...how big are the rear tires...

Re: any gains going from 4.10 to a 4.30 gear [Re: tboomer] #1188944
03/02/12 10:32 AM
03/02/12 10:32 AM
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Posts: 1,142
Central New York
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Quote:

Pretty interesting...I would like to change the 4.88s out and go with a 4.30...




I run 1/8th mile more now than 1/4. So I did the opposite I went from 4.30s to 4.88s. Did change the 60' but that could be just the track and I am only talking .002 quicker. The thing I saw was the car was alot more consistant thru the run.Plus shifting into high sooner gave me less to think about before the last 60' to the finish line.Killed the car for 1/4 mile races. Runs out of RPM and hits the high rev control at the 1000' mark.Still runs 10.80s letting off compared to 10.6s /10.7s with the 4.30s.


If the MODS did their job I would not be hitting the notify MOD button. LOL
Re: any gains going from 4.10 to a 4.30 gear [Re: smokinwoody] #1188945
03/02/12 10:34 AM
03/02/12 10:34 AM
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The old 4.56s were junk when Jimmy did the back half...I was out of money and he had the 4.88s.. Tires are an M/T 10.5x31w...


Need your rear end checked out? Contact Grizzly!!
Re: any gains going from 4.10 to a 4.30 gear [Re: slippery440] #1188946
03/02/12 10:42 AM
03/02/12 10:42 AM
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Vic...We only run 1/8th a couple of times in a season...My engine runs out of air after 6400 rpms.. So maybe a change is in order..


Need your rear end checked out? Contact Grizzly!!
Re: any gains going from 4.10 to a 4.30 gear [Re: tboomer] #1188947
03/02/12 04:13 PM
03/02/12 04:13 PM
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Bend,OR USA
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Quote:

The old 4.56s were junk when Jimmy did the back half...I was out of money and he had the 4.88s.. Tires are an M/T 10.5x31w...


Tire size can and usually does have a large impact on finish line RPM. I ran my car at Woodburn last year with a set of Goodyear 12x29x15 slicks on 12 inch rims that where right at 89.0 inches circumference, the car would crossed the finish line at 7000 to 7100 RPM. I switch to a set of MT 10.5x31x15W slicks on 10 inch rims that are 101 inches circumference with no other changes and the car crosses the finish line at 6500 RPM, same MPH within .10 MPH


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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