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4.30 verse 3.23 gears
#1680969
10/02/14 04:00 PM
10/02/14 04:00 PM
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Joined: Aug 2003
Posts: 1,062
Amherst,NY
challengermike
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 1,062
Amherst,NY
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A few weeks ago I blew up a set of 4.30 gears that were in my car. All I had was a set of 3.23s so I threw them in just so I could continue racing the rest of the season. I had 30" tall drag radials on it. So I figured with the 3.23s I would need all the help I could get so I threw on a set of 26" drag radials. Now the 4.30s with 30" tires comes out to be roughly 4.01 ratio and the 3.23s with the 26" tall tires come out to be 3.46 ratio. Much to my surprise the car had the same 60 ft of a 1.53 and the same 96 mph and same ets 7.08 in the 1/8. So now im thinking what to do for next year and wondering why nothing changed.
I had jetted the carb up and down before and it didn't change anything either.
Im starting to wonder if the head flow is where the loss/no change is.
What everybody think?
Combo
72 dart
440/499
comp 540/555 lift solid
otb stealth heads
fenderwell headers
2800 -3200 stall
850 demon on a rpm intake
Last edited by challengermike; 10/02/14 04:02 PM.
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Re: 4.30 verse 3.23 gears
[Re: challengermike]
#1680970
10/02/14 04:02 PM
10/02/14 04:02 PM
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Joined: Jun 2006
Posts: 5,162
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,162
CT
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 Which cam are you running?
Last edited by GTX MATT; 10/02/14 04:02 PM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 4.30 verse 3.23 gears
[Re: challengermike]
#1680973
10/02/14 04:48 PM
10/02/14 04:48 PM
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Joined: Jun 2006
Posts: 5,162
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,162
CT
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Quote:
comp xe290s-10
which is.540/558 lift 110 sep, duration @ 50 is 252/260
I have that in my 440, with OOTB Stealths also.
I'd say you're not seeing much difference because in a 500 cubic inch engine that is not really a lot of cam. It probably has a pretty flat torque curve and doesn't need the extra gear.
I had 2.94s in my car when it went together and drove it a bit (4 speed). I put 4.56s in it. (29.5 inch tall tires). The car was a handful with 2.94s, but I can hardly keep up with it with 4.56s, it spins the 9 inch slicks from a roll in 3rd.
Out of curiousity, what valve springs are you running?
Last edited by GTX MATT; 10/02/14 04:52 PM.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 4.30 verse 3.23 gears
[Re: challengermike]
#1680974
10/02/14 04:49 PM
10/02/14 04:49 PM
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Joined: Nov 2003
Posts: 5,160
Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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The smaller ports with the big cubic inch engine has such a wide power range and torque range. So long as you have a torque converter that will jump the engine in power range it will pull that gear no problem and probably be more consistant.
Getting old just means you were smarter than some and luckier than others.
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Re: 4.30 verse 3.23 gears
[Re: GTX MATT]
#1680975
10/02/14 05:00 PM
10/02/14 05:00 PM
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Joined: Aug 2003
Posts: 1,062
Amherst,NY
challengermike
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 1,062
Amherst,NY
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Quote:
Quote:
comp xe290s-10
which is.540/558 lift 110 sep, duration @ 50 is 252/260
I have that in my 440, with OOTB Stealths also.
I'd say you're not seeing much difference because in a 500 cubic inch engine that is not really a lot of cam. It probably has a pretty flat torque curve and doesn't need the extra gear.
I had 2.94s in my car when it went together and drove it a bit (4 speed). I put 4.56s in it. (29.5 inch tall tires). The car was a handful with 2.94s, but I can hardly keep up with it with 4.56s, it spins the 9 inch slicks from a roll in 3rd.
Out of curiousity, what valve springs are you running?
When I built the engine it was for a street car so I didn't want a huge cam. It was 9.8 compression with ported 906S. I sold the car and put the engine in the current car with the otb stealths which lowered comp a little ,ROUGHLY 9.5 comp.The valve springs (I think)are still the factory stealths.I cant remember if I swaped springs from the 906s or not. I have no valve float issues, its been to 7,200 rpm but doesn't pick up any et or mph doing so. I shift at roughly 6,000.
Last edited by challengermike; 10/02/14 05:02 PM.
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Re: 4.30 verse 3.23 gears
[Re: Pacnorthcuda]
#1680977
10/02/14 05:18 PM
10/02/14 05:18 PM
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Joined: Aug 2003
Posts: 1,062
Amherst,NY
challengermike
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 1,062
Amherst,NY
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Quote:
Maybe you coincindentally hit the same two performance points on a parabolic curve??? Meaning every ratio BETWEEN the two would be faster (or I suppose slower). Kinda like sighting a scoped gun, if you know what I mean.
When I had the 4.30s though I did try putting the 26' tires on to see what it would do. I couldn't get it to hook but the mph was the same if that means anything.
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Re: 4.30 verse 3.23 gears
[Re: challengermike]
#1680978
10/02/14 05:28 PM
10/02/14 05:28 PM
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Joined: Jun 2006
Posts: 5,162
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,162
CT
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Quote:
When I built the engine it was for a street car so I didn't want a huge cam. It was 9.8 compression with ported 906S. I sold the car and put the engine in the current car with the otb stealths which lowered comp a little ,ROUGHLY 9.5 comp.The valve springs (I think)are still the factory stealths.I cant remember if I swaped springs from the 906s or not. I have no valve float issues, its been to 7,200 rpm but doesn't pick up any et or mph doing so. I shift at roughly 6,000.
And thats what you got, a street motor. Broad torque curve, nice response everywhere, deep gears not required. 
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 4.30 verse 3.23 gears
[Re: GTX MATT]
#1680980
10/02/14 05:39 PM
10/02/14 05:39 PM
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Joined: Feb 2003
Posts: 1,942
Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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Same experience with my 493. Running 3.55s and 4.10s, margnial difference between the two, also no difference shifting between 5500 and 6500, 530 cam 260/266 @ 0.050.
So I run the 3.55s and shift early...it's a blast on the street.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts
66 Belv. II - just a streetcar
88 Mustang - turbo LS beater
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Re: 4.30 verse 3.23 gears
[Re: BMChrysler68]
#1680981
10/02/14 05:48 PM
10/02/14 05:48 PM
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Joined: Aug 2003
Posts: 1,062
Amherst,NY
challengermike
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 1,062
Amherst,NY
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Quote:
Quote:
...otb stealths which lowered comp a little ,ROUGHLY 9.5 comp...
Excuse my ignorance, but how did you lose compression going to an 80cc closed chamber head? Were the 906s milled a bunch?
I guess I was wrong. the 906s were shaved to 82 cc and the stealths are I think 80 cc. I thought my 906s were shaved to 78 cc. my mistake.
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Re: 4.30 verse 3.23 gears
[Re: OUTLAWD]
#1680982
10/02/14 05:51 PM
10/02/14 05:51 PM
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Joined: Aug 2003
Posts: 1,062
Amherst,NY
challengermike
OP
super stock
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OP
super stock
Joined: Aug 2003
Posts: 1,062
Amherst,NY
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Quote:
Same experience with my 493. Running 3.55s and 4.10s, margnial difference between the two, also no difference shifting between 5500 and 6500, 530 cam 260/266 @ 0.050.
So I run the 3.55s and shift early...it's a blast on the street.
Thats what I found, street driving is a huge difference, Although I don't drive it much due to the spool. And once you to get the tires to spin they don't want to stop , lol
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Re: 4.30 verse 3.23 gears
[Re: challengermike]
#1680983
10/02/14 06:30 PM
10/02/14 06:30 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I am running 4.30's with 30" tires and I have been thinking of going to 3.91's as I was hoping with my 493 it wont slow me down any. But my 63 goes just over 3700 lbs so I assume it weighs more then your Dart. I cruise at 60 mph turning about 3200 rpm and the eng actually seems to love cruising at that rpm. So I may drop gear a little one day myself to see what happens. Ron
Last edited by 383man; 10/02/14 06:30 PM.
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Re: 4.30 verse 3.23 gears
[Re: Twostick]
#1680986
10/02/14 10:02 PM
10/02/14 10:02 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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A couple of years ago I was running 5.14's in my D50. At the time my best ET was 1.35 60 ft., 6.35 @ 108 in the 1/8. I broke those gears and put some 3.50's with a mini spool out of a Ford truck in it so I could race. I had a 1.40 60 ft., 6.39 @ 109 crossing the finish line in 2nd gear. Pump gas small block at 2950 lbs. with 315/60 MT Drag Radials 30 in tall. I am running 4.56's at the moment that are not low enough because I shift at 6800 and cross the finish line at 6000.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: 4.30 verse 3.23 gears
[Re: challengermike]
#1680987
10/03/14 02:02 AM
10/03/14 02:02 AM
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Joined: Aug 2003
Posts: 43,181
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,181
Bend,OR USA
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Quote:
I had jetted the carb up and down before and it didn't change anything either.
Im starting to wonder if the head flow is where the loss/no change is.
What everybody think?
Combo
72 dart
440/499
comp 540/555 lift solid
otb stealth heads
fenderwell headers
2800 -3200 stall
850 demon on a rpm intake
If you couldn't jet it up rich enough to slow the MPH down in the 1/4 you don't have enough fuel supply  I've seen this many, many times in race cars, every body usually under builds the fuel system and never fix it  They have enough fuel to as fast as there going until they change the fuel system, there're many gremlins in the fuel system  All the way from the fuel filters to the needles and seat sizes and every other part in between the tank and carb. or injection Let us know what you find  BTW, my old pump gas Duster, 518 C.I. pump gas Duster, didn't care if it had 3;73 to 4;30 It ended up running high nines through the muffs with the air cleaner on, motor only  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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