Re: '73 Fury upgrade - asking for help and recommendations
[Re: HemiFury1973]
#1278955
08/04/12 10:36 AM
08/04/12 10:36 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Welcome aboard! For starters I'd change the timing gear set to a new one with multiple 4 deg keyways & advance it 4 degrees and tweak the dist: set initial with vacuum gauge method/shorten slots to 38 total (no vac)/toss heavy spring/replace it with a light one/plug in vac adv & turn it CW with a 3/32" allen wrench to make it come in sooner. '73 model year was a terrible one for emission regs & you could go richer on the 2bbl jets. This'd give you a good boost without alot of down time.
live every 24 hour block of time like it's your last day on earth
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: gch]
#1278957
08/05/12 03:09 PM
08/05/12 03:09 PM
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Joined: Aug 2012
Posts: 12
HemiFury1973
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OP
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Joined: Aug 2012
Posts: 12
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Quote:
Finding your rear gear ratio will help you determine the best mods.
Thank you. How can i find the gear ratio?
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: HemiFury1973]
#1278958
08/05/12 03:51 PM
08/05/12 03:51 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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jack 1 rear tire just off the ground and place gearshift in neutral. put tire valve stem at 6 o'clock then rotate tire 2 revolutions & count # of driveshaft turns, ie 2&3/4 turns is 2.76. If you have a sure grip jack both rear tires just off the ground and rotate them 1 revolution & count the driveshaft turns
live every 24 hour block of time like it's your last day on earth
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: Mr.Yuck]
#1278962
08/07/12 06:26 PM
08/07/12 06:26 PM
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Joined: Nov 2006
Posts: 2,255 IL
furious70
top fuel
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top fuel
Joined: Nov 2006
Posts: 2,255
IL
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Holley SD intake will take all the low end torque away, I tried it several different ways on my 383. In the great intake dyno test it was down something like 30ft lbs @3000rpm to a dp4b, imagine how bad it was way down low.
when it was still NA and carb'ed, my car had a lot more grunt from an idle with the stock intake and 3.23's then it did with the SD and 3.91's.
70 Sport Fury 68 Charger 69 Coronet 72 RR
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: furious70]
#1278963
08/07/12 07:56 PM
08/07/12 07:56 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Holley SD intake will take all the low end torque away, I tried it several different ways on my 383. In the great intake dyno test it was down something like 30ft lbs @3000rpm to a dp4b, imagine how bad it was way down low.
when it was still NA and carb'ed, my car had a lot more grunt from an idle with the stock intake and 3.23's then it did with the SD and 3.91's.
did you have the open or dual plane SD? i was talking about the low profile dual plane
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: HemiFury1973]
#1278965
08/23/12 08:08 PM
08/23/12 08:08 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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The '73 is BUILT rich, the 2-barrel is choking the engine.
Ditch the 2-barrel and the carb. Buy a new Holley 670 Street Avenger and an Edelbrock Performer RPM.
A 400 is basically a larger bore 383 with low compression. You can definitely go too big, again I say the second Voodoo cam from the smallest would do all right.
Get your exhaust system right. If you can't find HP exhaust manifolds for it you can use the low perf ones but go to 2 1/2" system from manifold to rear end, using two Dynomax 17748 or 17749 Hemi Turbos. Be sure to put in an H-pipe, that's a pipe connecting the exhaust pipes to each other, should be the same diameter and as far forward as will fit.
With all my changes you'll pick up at least 50 hp with no decrease in fuel mileage, probably an increase. The car will feel completely different. It's amazing what a simple 4-barrel swap can do.
R.
Last edited by dogdays; 08/23/12 08:12 PM.
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: dogdays]
#1278966
08/24/12 03:11 PM
08/24/12 03:11 PM
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Joined: Aug 2012
Posts: 12
HemiFury1973
OP
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Posts: 12
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Quote:
The '73 is BUILT rich, the 2-barrel is choking the engine.
Ditch the 2-barrel and the carb. Buy a new Holley 670 Street Avenger and an Edelbrock Performer RPM.
A 400 is basically a larger bore 383 with low compression. You can definitely go too big, again I say the second Voodoo cam from the smallest would do all right.
Get your exhaust system right. If you can't find HP exhaust manifolds for it you can use the low perf ones but go to 2 1/2" system from manifold to rear end, using two Dynomax 17748 or 17749 Hemi Turbos. Be sure to put in an H-pipe, that's a pipe connecting the exhaust pipes to each other, should be the same diameter and as far forward as will fit.
With all my changes you'll pick up at least 50 hp with no decrease in fuel mileage, probably an increase. The car will feel completely different. It's amazing what a simple 4-barrel swap can do.
R.
Thank you so much. But will 670 not be too big for the engine? And the intake - Edel brock rpm will be better than weiand with the Holley carb?
Hemi
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: bobs66440]
#1278968
08/25/12 01:03 PM
08/25/12 01:03 PM
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Joined: Aug 2012
Posts: 12
HemiFury1973
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Joined: Aug 2012
Posts: 12
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Quote:
What carb do you have on it now? 2bbl?
A small Edelbrock 4bbl (600 or 650) on a Edelbrock Performer intake will help some along with some headers.
I wouldn't go throwing a cam at it without knowing exactly what's in it now for pistons, compression ratio, etc. You could really kill the power that way.
The compression ratio is 8.2, rear end 2.71.
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Re: '73 Fury upgrade - asking for help and recommendations
[Re: HemiFury1973]
#1278971
10/15/12 04:40 PM
10/15/12 04:40 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Quote:
and a new mopar performance ignition kit
If it comes with an orange box I would suggest keeping a spare 4 pin ECU in the glove box. Your parts house has em for cheap. I'm assuming you already have electronic ign. I'd get a hotter coil/ballast. I use a FBO coil and MP 1/4 ohm ballast and OE ECU & it starts/runs awesome. the power is pretty much from the coil/ballast combo & not the coil primary switcher (ECU) but people are raving about FBO's new ECU. EDIT If needed there is a pentastar ECU harness/pigtail assy for $28 in the BB for sale section page 6 which may or may not come with the 2 terminal nominal 1.25 ohm ballast but was not shown in the pic
Last edited by RapidRobert; 10/15/12 05:13 PM.
live every 24 hour block of time like it's your last day on earth
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