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  #1  
Old 12-09-2000, 08:39 PM
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rb77413 rb77413 is offline
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OK. Here's the question. Can someone do me a favor and run my combo through a desktop dyno for HP ratings and 1/4 mile times? If it hits the 13's, I believe any conv in the 13's needs a roll bar to be legal. I tried to make it this Friday to DeSoto but money permitting (or lack of) I never got the chance. If someone can here is the combo.

383 .030 over

9.0:1 CR

Lunati adv. 275 dur (225 @ .050 lift)
.477 lift, lobe sep.108^

Edel Performer intake

1411 750 vac sec elec choke

Hooker C-body headers, not sure of primary tube size 3 inch collector with 2 1/2 exhaust dumps out in front of rear tire

906 heads with big valves. Very mild porting, just put stock heads with the big valves.

The car:
1970 Newport Convertible (4000lb?) registration says about 3900.

2500 stall converter.

3.23 gears open

215-70-15 tires (temporary)

Stock tranny. No shift kit yet.

I think thats it. Not sure what else is needed. Thanks alot

Bob

20 MoPars and countin'

[This message has been edited by rb77413 (edited December 09, 2000).]
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  #2  
Old 12-10-2000, 07:00 AM
451Mopar 451Mopar is offline
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I think you might get 380 to 400 HP?
Have you driven with the 2,500 stall converter (does it really stall at 2,500 RPM?) I think it may stall at a lower RPM because of your engine combination. I would use a 10" converter and more gear (or a low first transmission gear) to get the heavy car moving from a stop.

My old 383 in my heavy '71 Charger was built fairly simular (same compression, very simular Crower cam.) My GER converter only stalled at about 1800-2,000 RPM? I don't know if it was the lack of low end, or just the junk GER converter. At the time I also ran 3.23:1 gears with 26" tall tires. This made a good driver and performed well and reved to 6,000+ RPM easely, but from a dead stop it was pretty weak. I swaped gears to 3.91:1 gears which helped when racing, but the car wanted more converter stall speed.
Maybe with a good 2,500 stall converter and not the GER that may have been defective, it would be OK? I still think a 10" 2,800-3,000 stall would have been better.

My friend runs a 10" converter with the low first gear set in his 727 and either 3.55:1 or 3.23:1 gears (depends on how much he plans to drive on the highway.) I really like this combination in a heavy dual purpose car because the higher converter stall and low first gear helps get the heavy car moving quick and the mild rear gears keep the highway RPMs down. I think with your taller tires 3.55:1 gears might be better. Also, use a large transmission cooler with the stall converter.
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  #3  
Old 12-10-2000, 08:11 AM
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rb77413 rb77413 is offline
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I got the converter from mopartsracing. It really goes to 2500. right off the line it jumps to 2500 and the car pulls. It pulls the best from about 3500 to 4500. The power range of the cam is 2000 to 5500. The 383 pulls to 6000 but I shift it at about 5700.
getting a 28000 GVW tranny cooler. I do alot of highway driving so the 3.23's help alot. The tires are temporary. Might do a 255-60-15.
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  #4  
Old 12-10-2000, 10:18 PM
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dschumers dschumers is offline
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I'm guessing high 14's. Let us know what it does run.
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  #5  
Old 12-11-2000, 03:18 AM
fast68plymouth fast68plymouth is offline
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my guess is 15.40@90mph
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  #6  
Old 12-12-2000, 05:25 PM
ChristianCuda ChristianCuda is offline
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Running it through Dragstrip Plus you will have between 14.9 and 15.2 and 93-96MPH.

You can get it into the 13.20-13.30 by changing gears and convertor. Since you dont want to hit the 13's then i think you will be fine. Especially with just the performer manifold. It did say that the cam duration may be too much though.

Christian

------------------
Http://ThunderRacing.Knudstrup.net/

68 'Cuda 383 Best of 8.363@83.78 in the 1/8mile which is a mid 12 with a 1.89 60ft
Formula S recreation not original but making like they should have at the factory) Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360
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  #7  
Old 12-13-2000, 07:51 AM
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rb77413 rb77413 is offline
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Hey Christian,

Thanks for running it. I think a roll bar would look pretty sweet with the top down. I'll probably keep the 2500 stall, or maybe go to a 2800. What gears are needed to hit the 13's High 13's would be nice. Something to match the duration of the cam. What about going to a performer RPM. How much of an improv. with just an intake swap? Thanks again.

Bob

20 MoPars and countin'
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  #8  
Old 12-14-2000, 04:43 PM
ChristianCuda ChristianCuda is offline
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I need to rerun it as I didnt save it. But i think it wanted extremely low gears such as 4.88 or 5.13 and more convertor say 3500. But all this and that intake and cam wont match up. You will need to toatally rethink everything. Right now I think you have a good matchup for the car for a steady and strong 1/4 mile. If you want to go faster you will need to rematch all your parts and think about what you want to sacrifice to go faster. More convertor and gear will make it less streetable.

I would say have fun with it as it is for awhile. Make this one consistant then if you want more then sit down and match up the parts and do it but then make that consistant before making anymore changes.

Christian

------------------
Http://ThunderRacing.Knudstrup.net/

68 'Cuda 383 Best of 8.363@83.78 in the 1/8mile which is a mid 12 with a 1.89 60ft
Formula S recreation not original but making like they should have at the factory) Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360
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  #9  
Old 12-16-2000, 02:41 AM
Runner1971 Runner1971 is offline
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i think high 14s low 15s
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