Fed need more speed!/Help me sort out combo!
#486998
10/03/09 04:07 PM
10/03/09 04:07 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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OP
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Posts: 282
Stockholm,SWEDEN
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I think the 1/4 MPH is low, the car ran on the RPM limiter a long way 7000 RPM Could it be a converter problem? Frontenginedragster built in 1962 Cr-mo chassi 195”wheelbase Wheight 1688 LBS/766KG with driver Rear: 8 ¾ rear 4.10 spool Tires:33/10.5 MT slicks 6 PSI tire pressure Trans: TCI Long Glide Transbreak Converter: TCI Super Street Fighter 3000 stall Engine: Mopar 440 stroked to 498 Engine made 722HP/5800RPM 727LBF/4700RPM 4:15 stroke Stage VI heads M1 intake 1050 Dominator Crower solid roller 319”/324”.670/.643 lobe sep 110 1/8 5.34/129.8 MPH 1/4 8.45/154.6 MP Best 60 foot# 1.1896
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: Quicktree]
#487000
10/03/09 04:48 PM
10/03/09 04:48 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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It was in the car when i bought it from USA, there where a stock 440 in it that blow up on its 5 run. Replaced it with the 498.
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: Dodgem]
#487002
10/03/09 06:02 PM
10/03/09 06:02 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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Engin made most horsepower at 5800RPM, i would rather not rew it to high.
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: The Nutcracker]
#487003
10/03/09 06:10 PM
10/03/09 06:10 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Re: Fed need more speed!/Help me sort out combo!
[Re: jamesc]
#487006
10/03/09 06:51 PM
10/03/09 06:51 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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The engined has been on the dyno could be a little less HP because the distributor isnt looked out, had to lower the ignition. The wheelstand problem is solved ,im more used to it and adjusting the wheeliebars. The motor is more of a boatengine than a raceengine, unported VI heads making a lot of torque. I think that the converter may be the problem. do you now a good sourse for a PG vert. For a carpenters budget!
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: jamesc]
#487008
10/03/09 06:58 PM
10/03/09 06:58 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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On the run making 1/8 5.34/129.8MPH 1/4 8.45/154.6 MPH I was shifting at 7600RPM and had the rewlimiter at 7800RPM.
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: The Nutcracker]
#487009
10/03/09 06:58 PM
10/03/09 06:58 PM
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Joined: Jan 2003
Posts: 1,263 Southwestern Ontario Canada
racealittle
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
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I went that fast with a 550+ hp 440 and a Coan 3800 convertor, 3.91 in a 1900 lb FED. I was using 6800-7300 rpm to do it. I think it's the limiter holding you back. You seem to be hooking up. More converter means you would have to rev higher. Does it feel like it's pulling all the way? I think that you could use less gear and be more successful, perhaps a 3.5 gear. I know that I was a little over geared and should have used a 3.5.
Last edited by racealittle; 10/03/09 07:02 PM.
Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen!
Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
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Re: Fed need more speed!/Help me sort out combo!
[Re: racealittle]
#487010
10/03/09 07:05 PM
10/03/09 07:05 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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It pulls hard first. Could the converter be slipping? 1/8 5.34/129.8MPH 1/4 8.45/154.6 MPH Does the difference between 1/8 and 1/4 look ok? With the torque could I do better with another gear?727LBF/4700RPM The engine feel very strong.
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: The Nutcracker]
#487012
10/03/09 07:21 PM
10/03/09 07:21 PM
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Joined: Jan 2003
Posts: 1,263 Southwestern Ontario Canada
racealittle
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
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I talked with Larry Sheppard back in the early '90's about gear choice for a FED. He told me 3.5 was the optimium gear choice for the kind of motor I was running. I told him I had a 3.9 and a 4.10 with no money to try anything else at the moment. Told me to use the 3.9, but the 3.5 gear would be the answer.
You have a larger motor that makes more torque and hp earlier. So I think with 32 or 33" tires a 3.5 gear would be like the 3.9 gear I was using. It got the job done, but I was not effectively geared for the last 100 feet or so. I don't think the converter is the problem. The car is light and hooks. More convertor would get you near a 1 second 60 foot or better. I never got to try my 730 hp 440 and 5600 convertor in the digger. I sold the car last April after 20 years.
Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen!
Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
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Re: Fed need more speed!/Help me sort out combo!
[Re: The Nutcracker]
#487013
10/03/09 07:30 PM
10/03/09 07:30 PM
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Joined: Jul 2006
Posts: 282 Stockholm,SWEDEN
The Nutcracker
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Could the zoomieheaders hold me back? I do have a pair of alteredheaders. The engine was dynoed using regular dynoheaders.
-70 Cuda,-65 Valiant,-66 Valiant,-62 FED
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Re: Fed need more speed!/Help me sort out combo!
[Re: goldmember]
#487016
10/03/09 07:53 PM
10/03/09 07:53 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
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Quote:
The first question on my mind was the Zoomies and whether they were on the dyno. Ditch them for a good set of 4 into1's and you'll get results. I also agree that you'll be better off with a gear close to 3.5 ratio. Your combo is way off the HP/weight you stated. Converter isn't ideal but somethings killing that combo.
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Re: Fed need more speed!/Help me sort out combo!
[Re: The Nutcracker]
#487017
10/03/09 08:17 PM
10/03/09 08:17 PM
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Joined: Jan 2003
Posts: 5,875 communist bloc of new jersey
jamesc
master
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master
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Posts: 5,875
communist bloc of new jersey
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the zoomies aren't the best for HP that's for sure but your numbers are way off. i wouldn't be using the zoomies either way but be careful about changing too many things at the same time you can get even more lost. assuming the engine is making close to the HP you say it dynoed at the zoomies shouldn't slow it to the point you're at. with no converter slip or tire growth 7000 rpm with a 4.1 and 33" tires should be running close to 168mph. if you're car is turning 7000 rpm and only running 155mph that converter looks to be slipping a ton. no way i'd put a 3.5 gear in it, 3.9 is as far as i would go but you've got something else going on other than axle ratio. can you borrow a decent 8" race converter off someone? when running a power glide the converter is VERY important. without actually seeing the car run in person it can be hard to give good advice but no way that engine should be turning 7000 and only running 155. here's a link to a ratio/rpm/speed calculator. this is strictly numbers with no accounting for tire growth or converter slip. http://www.markwilliams.com/calculators.aspx here's one for converter slip http://www.wallaceracing.com/converter-slip.php
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