what gear would be better?
#1024527
07/02/11 02:41 PM
07/02/11 02:41 PM
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Joined: Jan 2003
Posts: 8,852 poplar bluff mo.
toplescuda
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i have a selection of a few differnt gears to put in the car first lil bout the car weighed 3020 lbs with the 340 been tubbed 4 link,8 point bar most of the stuff on front is glass 8 3/4 rear may change later tires are hooiser 31 18.5 15 radial,s the motor will be a all alum 488 kb hemi blown 14-71 striped mooneyham,injected ,pump gas goal is 1,000 hp now back to the gear will be drove around town and really after the stab n stear fun would love to get some daylight under the front but will work on that later gears are 3.55,3.91,4.10,4.56 heck even some 6.14,s
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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Re: what gear would be better?
[Re: toplescuda]
#1024529
07/02/11 03:21 PM
07/02/11 03:21 PM
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Joined: Jan 2003
Posts: 8,852 poplar bluff mo.
toplescuda
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just to make clear the tires on it now are not drag radials heard the hemi has lots of low torque but i really dont need to going 80 mph still in first lol i doubt the car will ever hook these tires lol would be cool to do a john force burn out lol
Last edited by toplescuda; 07/02/11 03:24 PM.
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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Re: what gear would be better?
[Re: BobR]
#1024533
07/02/11 06:33 PM
07/02/11 06:33 PM
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Joined: Mar 2005
Posts: 2,172 Ohio
theclutcher
top fuel
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top fuel
Joined: Mar 2005
Posts: 2,172
Ohio
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Quote:
3.55 but in a Dana rear.
that combo will make short order of that rear.
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Re: what gear would be better?
[Re: theclutcher]
#1024534
07/02/11 06:50 PM
07/02/11 06:50 PM
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Joined: Jan 2003
Posts: 8,852 poplar bluff mo.
toplescuda
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if it had a slick on it i could see it not lasting very long but foot braking with what its got for a tire now should last a lil bit i just cant see a 3.55 with a 31 inch tire at the track the thing would never see 3rd gear lol wich all are 1/8 mile
Last edited by toplescuda; 07/02/11 06:53 PM.
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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Re: what gear would be better?
[Re: toplescuda]
#1024536
07/03/11 01:02 AM
07/03/11 01:02 AM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,292
Bend,OR USA
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Quote:
i have a selection of a few differnt gears to put in the car first lil bout the car weighed 3020 lbs with the 340 been tubbed 4 link,8 point bar most of the stuff on front is glass 8 3/4 rear may change later tires are hooiser 31 18.5 15 radial,s the motor will be a all alum 488 kb hemi blown 14-71 striped mooneyham,injected ,pump gas goal is 1,000 hp now back to the gear will be drove around town and really after the stab n stear fun would love to get some daylight under the front but will work on that later gears are 3.55,3.91,4.10,4.56 heck even some 6.14,s
I would try the 4.56 ratio first and then make the changes you think will work best, you might as well smoke the Hail out of them big boys on the back and scare the holy crap out of the locals BTW, I would definetly have a Dana 60 being built as soon as possible 40 splines spool and axles would be my choice
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: what gear would be better?
[Re: toplescuda]
#1024537
07/03/11 02:16 AM
07/03/11 02:16 AM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
master
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master
Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
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YOU MAKE YOUR SELECTION RELAVENT TO DESIRED TRAP RPM
1000 hp in a 3200 lb car = 8.52 @ 158.79
if you run 158 MPH with a 4.56 gear and 31" tires with 5% converter slippage = 8200 rpm traps same as above with 4.10 gear = 7375 rpm
home of the Sox and Martin Hemi Duster
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Re: what gear would be better?
[Re: HEMIFRED]
#1024538
07/03/11 08:43 AM
07/03/11 08:43 AM
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Joined: Jan 2003
Posts: 10,016 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
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Posts: 10,016
Frostbitefalls MN (Rocky&Bullw...
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Because of the torque available and low rpm in the lights, I would start with a 3.55 Dana axle. Even if you are shifting into high late, it will still be a better combo based on the trans low gear. I am basing this on the assumption you run a torqueflite? A 3.55 gear times 2.45 low gives you a low gear ratio of 8.69 x over 1000 ft lbs torque, x two for converter torque multiplication. At the hit it will be a monster. Here is the math i get. 1,000 tq x 2 (conv) = 2,000 x 8.69 = 17,395 at the axle x .9 ( driveline loss)= 15665 ft lbs torque at the axle when you crack the throttle. That is almost exactly what I have, and can say it is very hard to hook a 3000 lb car with that much power at the starting line! When you recalculate the torque at the tire surface on the track -15665 / 16 inch =978 x 12 =11741 foot lbs of thrust (or torque ) between tire and track. That is a bunch. Better have wheelie bars, because the car will be nose heavy,(momentum) and if it sticks the tires and gets off the ground, its going to go as far up as it has room. BTDT.
Last edited by gregsdart; 07/03/11 09:00 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: what gear would be better?
[Re: gregsdart]
#1024539
07/03/11 10:22 AM
07/03/11 10:22 AM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
master
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master
Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
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Quote:
Because of the torque available and low rpm in the lights, I would start with a 3.55 Dana axle. Even if you are shifting into high late, it will still be a better combo based on the trans low gear. I am basing this on the assumption you run a torqueflite? A 3.55 gear times 2.45 low gives you a low gear ratio of 8.69 x over 1000 ft lbs torque, x two for converter torque multiplication. At the hit it will be a monster. Here is the math i get. 1,000 tq x 2 (conv) = 2,000 x 8.69 = 17,395 at the axle x .9 ( driveline loss)= 15665 ft lbs torque at the axle when you crack the throttle. That is almost exactly what I have, and can say it is very hard to hook a 3000 lb car with that much power at the starting line! When you recalculate the torque at the tire surface on the track -15665 / 16 inch =978 x 12 =11741 foot lbs of thrust (or torque ) between tire and track. That is a bunch. Better have wheelie bars, because the car will be nose heavy,(momentum) and if it sticks the tires and gets off the ground, its going to go as far up as it has room. BTDT.
trap RPM w/ 3.55 would be 6,000
home of the Sox and Martin Hemi Duster
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Re: what gear would be better?
[Re: theclutcher]
#1024544
07/03/11 01:51 PM
07/03/11 01:51 PM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
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master
Joined: Jul 2010
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SOUTH JERSEY
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the mechanical injection will not work very well on a street driven car.Yes it has ben done but the amount of tuning required takes gobbs of knowledge and experience. Use carbs :twocent HILBORN SAYS: Quote:
Technical Support - Mechanical - Fuel Injector Can I run a HILBORN mechanical fuel injector on a street car?
A Hilborn mechanical injector is classified as a constant flow system and was designed to operate at WOT under load. As a constant flow system, pressure and volume are controlled by the main jet, or pill, along with pump speed (engine rpm) and nozzle size. The barrel valve, which controls idle fuel and transitional fuel from idle to WOT, can be compared to a ball valve much like the one that turns off the water in your house. The basic design and lack of fuel control of a barrel valve does not allow us to control the fuel at part throttle especially no load part throttle. If you consider the fact that an engine's fuel requirements are based directly on load, and that we can have many different loads at different rpms all at the same throttle angle, the lack of fuel control for street applications becomes apparent. A mechanical system does not employ enough fuel control in the operating range where you drive your street car and, therefore, is not recommended for street use.
Of course we have all heard the stories of mechanical system working on the street but few if any actually worked correctly. The use of a dial-a-jet, additional bypass valves, and home center ball valves have all been used to provide fuel control for adequate street use, but fall far short of the fuel control required as part throttle load is constantly changing. The constant manual adjustments needed, as one guesses the current fuel requirements of the engine, leaves very little time to actually drive the car and, at best, is incredibly inaccurate. Blown applications appear not to be as affected by the lack of fuel control of mechanical injection, possibly due to the load placed on the engine to drive the blower, but is still not recommended for those looking for the best all around drivability.
The use of alcohol helps because of it's large tune-up window, but fails to provide drivability due to loading up, mileage (in gallons to the mile) and severe oil dilution. Claims from those that run injected engines on stands or dyno's stating they can make mechanical injection streetable, are unable to simulate a fraction of the different part throttle load scenarios your engine will see, nor provide the required fuel control. Interestingly enough, engineers have devised a way to electrically control these valves and bypasses...it's called electronic fuel injection.
NOTE: Our products are not legal for sale or use on emission controlled vehicles.
home of the Sox and Martin Hemi Duster
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Re: what gear would be better?
[Re: HEMIFRED]
#1024545
07/03/11 02:29 PM
07/03/11 02:29 PM
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Joined: Jan 2003
Posts: 8,852 poplar bluff mo.
toplescuda
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if all else fails i have a pair of matched dom. carbs but that will be when i just flat give up on the inj.
1970 barracuda convert. 1 of 59 1970 pro street A.A.R. clone (panther pink) 1971 charger 2015 hellcat challenger. Redline red 2014 quad cab 4x4 ram 8 speed hemi
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