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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357795
12/23/12 06:56 PM
12/23/12 06:56 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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I run mine in the 1/8 and shift at 6800 and cross the finish line at 6700-6800. It has 5.14 and a M/T 315 60 Drag Radial, about 30 in tall.
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: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357798
12/23/12 10:47 PM
12/23/12 10:47 PM
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Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
master
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master
Joined: Dec 2006
Posts: 4,647
aotearoa
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Quote:
Does anyone think 4.88's would be the better and safer choice for a 11 or 10 sec car?
i run 4.88 in my junk which is running low 9's. shift @ 7k cross the line at 7200 with32" tall slicks.
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357801
12/24/12 12:15 AM
12/24/12 12:15 AM
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Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
moparguy7074
top fuel
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top fuel
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
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Quote:
Does anyone think 4.88's would be the better and safer choice for a 11 or 10 sec car?
I have 4.30 gears in my 10.9x car with 29x9 rear tires. My car crosses at 63-6400 in the quarter. 
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Re: 5.13 Gears Anyone???
[Re: moparguy7074]
#1357802
12/24/12 12:25 AM
12/24/12 12:25 AM
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Joined: May 2003
Posts: 6,562
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,562
Downtown Roebuck Ont
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Well right off the bat if you have gained 1000 rpm of stall with the same engine combo, your converter is pooched. You need a new tach too.  Without engine/car combo details nothing else much useful can be done here. Just because it will turn 7000 plus doesn't mean it is doing anything there but making noise. Kevin
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357808
12/24/12 03:27 PM
12/24/12 03:27 PM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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When you put the dial indicator on the retainers to see how much lift you have take the time to record the duration at .050 from oepning to closing, in other words watch the dial incator , when it reaches .050 on the opening write down the numbers it has before or after top dead center and the same on the closing, write down how much after bottom dead center it reaches .050 before closing. Do both valves, intake and exhaust and post the results on here We will be able to to tell you exactly what the duration is at.050 and how much, if any, the cam is advanced or retarded  BTW, you will need a piston stop and a degree wheel, you will probally need to take the crankshaft pulleys off to mount and set up the degree wheel  As far as your results with all those changes, it doesn't suprise me that it spun the tires and didn't run as good as it did the firts time  I would put it back, the motor parts, not the gear changes, and see if it runs as good as it did the first time If it does don't make any other changes until you max the tuneup and set up you have that runs good Once your thier then do ONE change at a time, not a bunch of changes   I've seen .25 canges in E.T. by swapping accelerator pump squirters  Lots of things to try on race cars, more better change them one at a time
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357814
12/25/12 07:02 AM
12/25/12 07:02 AM
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Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer
super street
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super street
Joined: Oct 2003
Posts: 1,409
Ont. Canada
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Quote:
The car is 2600 lbs w/o driver and about 2800 w/d. The car is down on hp with out a doubt!!
For all the parts you have been listing, you are way down on power........
Quote:
It needs a better carburetor like a holly 950 hp instead of the junk 750 proform street series we have on the motor now!
I doubt your carb is killing you that much...... 750's can easliy run into the nines at your wt........ Have you checked WOT???
Quote:
It also needs a way better set of headers. The ones that are on there now are only 1 5/8. They are very restrictive!!
Not uncommon to see headers of this size run into the mid to low 11's
Quote:
The timing needs tuned in. It may be way off because we never got a timing light on it.
This could be completely killing off your power...... Set the timing right........
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357816
12/25/12 02:07 PM
12/25/12 02:07 PM
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Joined: Dec 2012
Posts: 15
selah, washington
72340dustermike
member
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member
Joined: Dec 2012
Posts: 15
selah, washington
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i run a 72 duster with 513s and i love them i have had 456, 488s and i needed to 513s to get the rpm into the range i needed for the top of my power band. the 488s went thought the traps at 6400 rpm 12.20s i put in the 513s the best i got was 6800 rpm 11.41 that was a 340 60over motor with trw flat top pistons mild cam 8" 5000 converter transbrake shift at 1/2 6200 2/3 6400 like i said i love 513s 60' is 1.63 to 1.60 oh ya almost forgot sorry i am running a 29 in tall tire 
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Re: 5.13 Gears Anyone???
[Re: moparguy7074]
#1357817
12/25/12 02:14 PM
12/25/12 02:14 PM
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Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer
super street
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super street
Joined: Oct 2003
Posts: 1,409
Ont. Canada
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Quote:
Could be a fuel delivery problem...What mechanical pump do you have? What size line? There are so many factors you are listing that could be causing lack of power, the rear gear sounds like the least of your problems. Timing could be way off and slowing you down.
Mech fuel pump.......... yup a whole new list of possibilities.....
#1 Fuel is way too hot
#2 pump is not adequate volume wise
#3 your pulling on your fuel system - how are your fuel lines routed?
Yes the gears are the least of your worries......
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357819
12/25/12 02:29 PM
12/25/12 02:29 PM
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Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer
super street
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super street
Joined: Oct 2003
Posts: 1,409
Ont. Canada
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Quote:
We run a blue generic jegs electric pump and it has very good fuel pressure! It's get's like a steady 7 1/2 pounds and sometimes 8. I forget the size of the fuel line at the moment but it is way bigger then the stock line. How they are ran would have very little if none effect on performance. I think there may be alittle performace difference if we mess with the fuel delivery system but not alot. I think timing is problem going to be a pretty big gain. I Just got a new timing Light and Leak Down Tester For Christmas so will know some answers soon!
How will you set the timing?? hopefully your timing is out........
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357821
12/25/12 02:39 PM
12/25/12 02:39 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
We run a blue generic jegs electric pump and it has very good fuel pressure! It's get's like a steady 7 1/2 pounds and sometimes 8. I forget the size of the fuel line at the moment but it is way bigger then the stock line. How they are ran would have very little if none effect on performance. I think there may be alittle performace difference if we mess with the fuel delivery system but not alot. I think timing is problem going to be a pretty big gain. I Just got a new timing Light and Leak Down Tester For Christmas so will know some answers soon!
Fuel pressure is one thing but flow is more important
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Re: 5.13 Gears Anyone???
[Re: Sb Valiant]
#1357827
12/25/12 04:20 PM
12/25/12 04:20 PM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Quote:
yes then it goes into a dual feed up to the carburetor
A #6 AN line is 3/8 I.D., those are good for feeding one fuel bowl each The Jeg blue pump is probally a Holley blue clone, made in China It may or may not be suffecient for how fast you want to go A good way to test the fuel system on the car is to jet the carb. up, all four jets together the same amount in size, to see if you can slow the 1/4 MPH down, by making it to rich IF you CAN'T you don't have enough fuel volume (supply), not fuel pressure One of my Carbs. had OEM Holley .110 needles and seats in it, I could not jet the carb. rich enough to slow the car down until I switch the needles and seats to .120 Lots of gremlins out there, some are easy to fix, some are not so easy  Some dial back timing lights are not that good when used on a Hi Po race ignition, turn the knob all the way to the left and check the timing at idle, then without touching the knob see if you can figure out what total timing you have above 4000 RPM Let us know your results Maybe we can help you eliminate a gremlin  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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