Re: 572 going to the Dyno
[Re: JACK1440]
#2593464
12/17/18 11:32 PM
12/17/18 11:32 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
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I Live Here
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Posts: 14,499
So. Burlington, Vt.
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That’s really good power with using 2” fenderwell headers.
I’m sure it would have been real close to 900 with the bigger tubes.
On a pretty mild 542 with ez heads, going from 1-7/8” fenderwells to my dyno headers was a 40hp difference.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 572 going to the Dyno
[Re: fast68plymouth]
#2593465
12/17/18 11:35 PM
12/17/18 11:35 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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That’s really good power with using 2” fenderwell headers.
I’m sure it would have been real close to 900 with the bigger tubes.
On a pretty mild 542 with ez heads, going from 1-7/8” fenderwells to my dyno headers was a 40hp difference. Yep that fender well header is a killer. Usually the tubes are long enough to plumb a corn field. That hurt you more than the tube diameter. That and most FW headers have notoriously short collectors.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 572 going to the Dyno
[Re: JACK1440]
#2593607
12/18/18 05:27 AM
12/18/18 05:27 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
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Posts: 27,421
Balt. Md
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I just got home. We had our challenges. My 2 1/8" tube headers hit the dyno frame so I had to use a set of 2" fender wells I took along so the exhaust ports measure 2.150 across on a 2" tube. That couldn't be helping things. To top it off my pro systems 1050 was giving us a fit and when I went to the truck the box I grabbed out of the garage didn't have the SV1. yup! 1 1/2 south in Baltimore... Ugg anyways after bolting on the dyno tuners 1150 dominator she made 865hp @ 7200 and 760 lbs tq @ 5800. I will post the dyno sheet with all the pulls once I get it. It's being emailed and I haven't got it yet. The motor is making really good power from basically 5200 - 7400. It was above 700 lbs torque @ 4800 and climbed from there. I'm thinking my good headers a carb that works and a vacuum pump and I'll be at 900. Anyways... I'll post the sheet once I get it. Thanks for all the interest. That's awesome Jack !! I definetly want to go when you take her to the track. Ron
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Re: 572 going to the Dyno
[Re: dvw]
#2593803
12/18/18 03:32 PM
12/18/18 03:32 PM
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Joined: Sep 2009
Posts: 500 MD
JACK1440
OP
mopar
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OP
mopar
Joined: Sep 2009
Posts: 500
MD
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The telling tale will be ET, mph once it's in the car. It didn't break. Recorded a fair number with room for easy improvements. What's the car weigh? Trans and gear? Doug This is basically how I feel. Lots of easy potential, it survived 9 hard hits and made promising numbers. I need to figure out how much fuel I need also. The car is a '68 cuda, 727, stall I'm thinking is gonna fall around 6000, dana 4.88 w/ 33" slicks
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Re: 572 going to the Dyno
[Re: JACK1440]
#2593901
12/18/18 06:39 PM
12/18/18 06:39 PM
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Joined: Jan 2003
Posts: 10,006 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
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Frostbitefalls MN (Rocky&Bullw...
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My combo; 4.56 gear, 33x15x15 goodyear 2078 (105 roll Out) 150 mph logged 7450 trap rpm, 9.5 lennys, stall 6,000 rpm to 6200. I would put a 4.30 in it, no more. If you want to run a 14x32, then 4.10. With a 2.45 low and a 4.56 gear, the SLR is 11.17, which is awfully high for a 572. Take crank torque at 6,000 x 2 (converter) x11.17= about 17,000 at the hit to the axles on launch. Digest that for an instant. Plan on a transbrake?
Last edited by gregsdart; 12/18/18 06:46 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572 going to the Dyno
[Re: AndyF]
#2593909
12/18/18 07:16 PM
12/18/18 07:16 PM
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Joined: Sep 2009
Posts: 500 MD
JACK1440
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4.88 gear seems like a lot with that engine. What is your trap speed going to be with that much power? 145 or 150 mph? Those gears will have you spinning 7500+ rpm. What did the torque curve look like on the dyno? I'm guessing peak torque was in the 5500 to 6000 rpm range? HP peak was probably less than 7000 rpm wasn't it? You might need to drop the gear ratio down to 4.56 or even 4.30 to avoid spinning it too hard in the lights. That's the same thing the dyno owner and engine builder said. My plan is to more then likely take some gear out of it. Andy, your pretty close peak torque was 5800 and peak hp 7200.
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Re: 572 going to the Dyno
[Re: JACK1440]
#2594378
12/19/18 07:09 PM
12/19/18 07:09 PM
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Joined: Sep 2009
Posts: 500 MD
JACK1440
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MD
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