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any gains going from 4.10 to a 4.30 gear #1188928 03/01/12 01:52 AM 03/01/12 01:52 AM
Joined: Jan 2007 Posts: 8,163 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,163 Mt Morris Michigan	anyone have an ET gain going from 4.10 to 4.30 gear? http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188929 03/01/12 07:38 AM 03/01/12 07:38 AM
Joined: Oct 2005 Posts: 1,648 Ringtown, Pa. Dartsport540 top fuel
Dartsport540 top fuel Joined: Oct 2005 Posts: 1,648 Ringtown, Pa.	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 08:31 AM 03/01/12 08:31 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	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 08:34 AM.

Re: any gains going from 4.10 to a 4.30 gear [Re: Dodgem] #1188931 03/01/12 08:40 AM 03/01/12 08:40 AM
Joined: Dec 2007 Posts: 830 east coast Otherlane super stock
Otherlane super stock Joined: Dec 2007 Posts: 830 east coast	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 08:57 AM 03/01/12 08:57 AM
Joined: Apr 2004 Posts: 12,339 somwhere S smokinwoody I Live Here
smokinwoody I Live Here S Joined: Apr 2004 Posts: 12,339 somwhere	http://www.wallaceracing.com/calcrgr.php

Re: any gains going from 4.10 to a 4.30 gear [Re: Otherlane] #1188933 03/01/12 10:27 AM 03/01/12 10:27 AM
Joined: Jan 2003 Posts: 16,941 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,941 NC	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 10:33 AM 03/01/12 10:33 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	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 11:38 AM 03/01/12 11:38 AM
Joined: Apr 2007 Posts: 2,029 Trumbull,CT. J jim sciortino top fuel
jim sciortino top fuel J Joined: Apr 2007 Posts: 2,029 Trumbull,CT.	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 12:08 PM 03/01/12 12:08 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	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 02:21 PM 03/01/12 02:21 PM
Joined: Aug 2003 Posts: 43,970 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,970 Bend,OR USA	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 02:58 PM 03/01/12 02:58 PM
Joined: Jan 2007 Posts: 8,163 Mt Morris Michigan mopar dave OP master
mopar dave OP master Joined: Jan 2007 Posts: 8,163 Mt Morris Michigan	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, . http://www.youtube.com/watch?v=aIxaesJ190U http://youtu.be/lCZAaN7fFLg

Re: any gains going from 4.10 to a 4.30 gear [Re: mopar dave] #1188939 03/01/12 06:45 PM 03/01/12 06:45 PM
Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio VernMotor master
VernMotor master Joined: Nov 2003 Posts: 7,348 Mt.Vernon ,Ohio	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 08:39 PM 03/01/12 08:39 PM
Joined: Jan 2003 Posts: 16,941 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,941 NC	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 09:22 PM 03/01/12 09:22 PM
Joined: Jun 2009 Posts: 429 Sherman Texas T The Shocker mopar
The Shocker mopar T Joined: Jun 2009 Posts: 429 Sherman Texas	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 09:09 AM 03/02/12 09:09 AM
Joined: Jan 2003 Posts: 26,465 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 26,465 United Socialist States of Ame...	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 09:31 AM 03/02/12 09:31 AM
Joined: Apr 2004 Posts: 12,339 somwhere S smokinwoody I Live Here
smokinwoody I Live Here S Joined: Apr 2004 Posts: 12,339 somwhere	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 09:32 AM 03/02/12 09:32 AM
Joined: Jan 2003 Posts: 1,142 Central New York slippery440 Crybaby440
slippery440 Crybaby440 Joined: Jan 2003 Posts: 1,142 Central New York	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 09:34 AM 03/02/12 09:34 AM
Joined: Jan 2003 Posts: 26,465 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 26,465 United Socialist States of Ame...	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 09:42 AM 03/02/12 09:42 AM
Joined: Jan 2003 Posts: 26,465 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 26,465 United Socialist States of Ame...	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 03:13 PM 03/02/12 03:13 PM
Joined: Aug 2003 Posts: 43,970 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,970 Bend,OR USA	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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