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CC Advertisers
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05-03-2004, 05:27 PM
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Senior Club Cobra Member
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Join Date: Jun 2003
Location: West Linn,
OR
Cobra Make, Engine: ERA #684, 428 FE, TKO600
Posts: 1,378
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Not Ranked
Nice converter program, just plug in ratios, tire size, etc and it will give you the theoretical numbers.
http://www.368s.com/tools_rpm.phtml
DonC |
05-03-2004, 06:39 PM
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CC Member
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Join Date: Aug 2002
Location: Uranus,
cal
Cobra Make, Engine: NAF replica, 351W, about 420 HP
Posts: 3,046
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Not Ranked
Re: whats ye'alls opinion?
Quote:
Originally posted by MAXVELO
I have the opportunity to purchase a set of 3:15 gears. Just curious what my RPMs would be @60 or 70 mph? My rear tires are P315/35ZR17's. Thanks Gary
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Max, I have what I believe to be 3.05 gears in my 8.8 Ford rear end. At 80 MPH, in 4th, the engine turns 2800 RPM. At 80 MPH, in 5th, the engine turns 1800 RPM. I am running Dunlop 275/60 R 15 tires in the rear. Dont Know the heighth of the tires, but I will look it up tonite.
__________________
Edley, The Cobra Rogue!
"If you think that you can cut it, if you think you got the time, you'll only get just one chance, better get it right first time. 'Cause in this game you're playing, if you lose you got to pay, and if you make just one wrong move, you'll get BLOWN AWAY. Expect no mercy.
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05-04-2004, 06:43 AM
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CC Member
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Join Date: Jun 2003
Location: ALBUQUERQUE,
NM
Cobra Make, Engine: West Coast Cobra weber fuel injected 557 C.I.. 800H.P 760LBS. TQ. Magnum T56
Posts: 330
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Not Ranked
NOW THATS WHAT IM TALKIN BOUT!!!!
tHANKS DonC, That is exactly what I was needing!
Gary  
__________________
WHEN YOU HAVE MORE HORSEPOWER THAN YOU NEED ITS STILL NOT ENOUGH!!!!!!!
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05-04-2004, 07:03 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,612
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Not Ranked
Max,
I am running 3:27 gears in my 8.8 rear end with the .8 split in my 5th gear and at 70 MPH I tach 1900. I wish I had gone to the .6 split in the transmission but I like the rest. With the aeredynamics of my brick, I can't get anywhere near the power band of the engine in 5th.
Ron  |
05-04-2004, 07:04 AM
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CC Member
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Join Date: Feb 2002
Location: Shepherdsville,
KY
Cobra Make, Engine: Unique 427 S/C, Red w/White Sripes, 427 SO, 4 speed Top Loader
Posts: 201
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Not Ranked
3:31 Jag with Auburn Unit, Close Ratio Toploader, Big Input and Output Shaft. 427 with approx 500 FT LBS Torque.
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Eliminator
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05-04-2004, 11:08 AM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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Not Ranked
3.08:1
With 7600 RPM redline and well over 500 rwhp this thin g has a BIG top end.
Also never fails to spin tires when I want...
__________________
E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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05-04-2004, 02:36 PM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
maxvelo, maybe you need a higher stall speed torque converter in your tranny. A higher stall speed will let your engine rev up higher before locking up, letting the engine closer to its rpm range. Do you know the stall speed your converter is rated at? Are you running a RV/econo torque converter?
Try to find somebody who has a lot of experience drag racing automatics, pro-street style, and let them ride in/drive your car to get their opinion whether you need gears or something else.
__________________
"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
Last edited by Anthony; 05-04-2004 at 02:43 PM..
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05-04-2004, 03:28 PM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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Not Ranked
Maxvelo Gary with the C6 and wanting to cruise the highway I would go with a 3.00 ratio. the 288 gears is not as strong as the 307-331 gears. I have a 3.31 jag with a Detroit locker in my car. I have both a 5spd G-force for racing and a nash 6spd for road cruising. The tires are 335-17 pilots. With the auto in your car, I would go with the 3.07s I think you will get the best of both worlds, If you are 1/4 mile racing 3.73 with slicks. My thoughts Rick Lake
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05-04-2004, 03:41 PM
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CC Member
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Join Date: Aug 2003
Location: Southeast,
CT
Cobra Make, Engine: ERA #375 427 S/C - 428FE - Toploader - 1968 AMX 390 Go Pack 4 Speed - My Daily Driver is a 2004 Crossfire
Posts: 872
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Not Ranked
I am running 3:31 rear gears in a Dana Jaguar Rear End coupled to a close ration Toploader.
This combo works great except in a parking lot and you are trying to go real S L O W .... I get a kind of lurching or pulsing slow roll with those long gears. Most others with this set up get the same characteristic.
I have a racing clutch, so it is either IN or OUT, there is no half way or inbetween if you know what I mean. Feathering the clutch is out of the question. This lends to the pulse at very low speed, IMHO. Perhaps a "normal" clutch which you could feather or slip would eliminate this.
This is a nice gear setup for high speeds. I stay mostly in first or second gear in town. Couple these gears with a nice torque laden engine and it is very enjoyable to drive.
__________________
Art in CT
See My Website at http://www.lithicsnet.com
A car can massage organs which no masseur can reach. It is the one remedy for the disorders of the great sympathetic nervous system. Jean Cocteau 1889-1963, French Author, Filmmaker
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05-04-2004, 04:51 PM
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CC Member
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Join Date: May 2002
Location: Ashburton, New Zealand,
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Cobra Make, Engine: UK Ram SC. KC-Yates 373, Jerico 5 speed.
Posts: 1,240
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Not Ranked
Final drive ratio
Interesting reading,
I agree with the earlier posts on gearing your car to suit the usage and cruising speed, all a compromise:
Firstly if you cruise at 60-70mph (sensible speed to avoid the cops) and in my case will be running a 393 stroker, 3.27 ratio on 26.5" tires that gives me 2500rpm at 60, 3000 at 72.
I also have a 3.08 ratio = 2500 at 64mph, 3000 at 77mph.
Regarding track use the main straight where I race is around 150+mph, so my machine should be floating around 6200 at 150mph.
I am going to run a Jerico, so wont bother with a 5 speed, but it would be handy if you were doing high speeds, on some nice back roads, to save the engine, if you were racing a ricer or something!
__________________
A J. Newton
The 1960's rocked!
Last edited by Ant; 05-09-2004 at 12:17 AM..
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05-08-2004, 10:39 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Based on the "math" I have a 3.1 rear ratio with a top loader. 1st is good for 60 mph easy! Around town stop and go is a pain in the butt.
However, for drag racing and as much power as I've got it makes sense. Many guys don't use 1st or short shift because the gearing is TO low and you fry the tires to easy.
2800 rpm at 70 with 26.5 BIG letter Goodyears. I DO need a clutch, it will slip at a launch of 3000 rpm.
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05-09-2004, 03:02 AM
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CC Member
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Join Date: Nov 1999
Location: Brisbane, Australia,
Q
Cobra Make, Engine: Contemporary CCX3117 427FE
Posts: 4,381
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Not Ranked
3.0:1 works for me. I'm running a Glide and even with the tall 1.76:1 first gear ratio, I can't use WOT in low gear. I'm around 2500rpm @ 60mph.
__________________
Craig
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