Is my Torque Converter too big for my setup ?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-31-2005, 12:46 PM
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Is my Torque Converter too big for my setup ??

I have a Hughes 4,000 stall for my engine setup .. The camshaft and intake power band are both rated to work at 3,000 rpms - 7,000 rpms .. MY car weighs 3,400 lbs with me in it .. I called different Torque Converter companys and gave them my setup when i was first looking for a torque converter and they all recommended a 4,000 stall converter .. So i went with a 4,000 stall .. Since my engine setup is built to make power starting at 3,000 rpms would it of made sense to go with a 3,000 stall or a 3,500 stall ???? Is my stall too big for my setup ???

What do i risk breaking if my stall is too big ??? My tranny is pretty much bullet proof so im not concerned about breaking it ... Is there anything else that might break because of the stall being too big ??? Or sholud it be fine and just get out of the hole a little harder ??

Actually my intake is rated at 2800rpms - 8,000 rpms ... My cam is rated at 3,000 rpms to 8,000 rpms ..

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Last edited by 74NovaRat; 01-31-2005 at 12:46 PM.
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Old 01-31-2005, 01:20 PM
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If you give us every little detail about the engine and car. I mean everything. We could make an educated/experienced guess on the converter.

Larry
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Old 01-31-2005, 02:02 PM
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Here you go ...



The motor is a 468 BBC
Trans is a Turbo 400
Stall is a Hughes 4,000
I havent made up my mind on the intake yet .. It will either be the tunnel ram with 2 Holley 660's or the Victor Jr. with a 1050 dominator ..
Heads are open chamber GM 990 rectangular port with 2.25'' Int / 1.88'' Exh Valves ..
Heads have had alot of porting done ..
12 to 1 Forged Speed Pro pistons
Block was 0 decked and heads have been milled some so im guessing my compression is close to 13 to 1
Cam is a Crower Solid Roller 260/270 @.050--- 651/677 lift
Crower solid roller lifters
5140 forged steel nitrid GM crank
1.7 Harlan Sharp Roller Rockers..
Lunati H Beam forged aluminuim rods
Rear end is a 31 spline 9 inch with 4.11 gears
Headers are Hedman ceramic coated 2 inch

Suspension Mods ..

Car has Caltracs slapper bars
Car has all new polyurethane bushings and body mounts
Competition engineering weld in sub frame connectors
New multi leaf springs..
Big block springs up front it
Competition Engineering ADJUSTABLE DRAG SHOCKS

Wheels and tires ..
Weld Drag Lites 15 X 8's with 28X10.5 MT ET Streets
Weld Drag Lites 15X 5's up front

Last edited by 74NovaRat; 01-31-2005 at 02:08 PM.
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Old 01-31-2005, 02:17 PM
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It should FLY!!! From my past experience you will not like the 660 Holley t-ram carbs.. Idle circuits cause lots of load up problems.. Used to be able to tell what carbs were on a Rat motor just by the way they sounded in the pits.. Go to the 750 t-ram carbs, similar to the 4779 but short bowls. Cleans up the low rpm problem and makes great upper rpm horsepower. I tried the Dominator also.. Worked great. But I didn't have the good manifolds back then.. Edelbrock C-454 and Offy 4500 series..
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Old 01-31-2005, 02:34 PM
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So even though my power band starts at around 3,000 rpms, it wont hurt anything that my stall is at 4,000 rpms ??? I dont risk breaking anything because of that ???

Also you dont think that two holley 750 dp's would be too much carb for the motor ??? I was thinking of going with two 650 dp's .. Or chunk the tunnel ram and go with a Victor Jr. 454 R with a 1050 dominator .. I really want to keep the tunnel ram, but i dont know if i will be able to tune them and make them work together properly ...
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Old 01-31-2005, 02:47 PM
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Me personally, I would step the induction down a notch, and get a single carb intake, and a 850 vacuum secondary. And take the stall way down. This way you can really take advantage of your displacement and use up some low rpm torque.

This is going to be a street car right?
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Old 01-31-2005, 02:51 PM
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NO this will be a 90% strip car and i think an 850 cfm would be way too small for my setup ..

Last edited by 74NovaRat; 01-31-2005 at 02:56 PM.
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Old 01-31-2005, 02:53 PM
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Sounds like all bases are covered. What about your driveshaft and u-joints. Make em stout to handle the power.
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Old 01-31-2005, 03:01 PM
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So its not a problem that my power band starts at 3,000 rpms and my stall at 4,000 rpms ?? That will not hurt anything ???

Yeah i already had a custom aluminum drive shaft built, and have replaced the U-joints ..
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Old 01-31-2005, 03:10 PM
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I can say I am not sure. Seems as though everyone has batted around your question. I really can not tell ya,as I have only ran one car with stall and it was all street. Sorry man,someone will catch it and give ya a straight out answer.Try posting the same in the trans. forum,might get a bite real quick bud.
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Old 01-31-2005, 03:33 PM
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You will be just fine with the 4000 convertor. You will be in the power band when the car launches. No bog off the line problem..

About the 750's, I thought they would be too much also, but they worked great. I had a setup similar to yours. A bit more gear. 2 1/8" Hookers. Steel rods. The motor never suffered from any over carb symptoms. Always ran clean and great top end..
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Old 01-31-2005, 03:52 PM
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The 4000 stall should be about perfect. With a cam of that size, and rectangular port heads on a 468, you will be making most of your power up high. I also agree that a single plane intake and something in the range of a 1000cfm carb would be the right setup.

Adam
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Old 01-31-2005, 03:55 PM
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Quote:
Originally posted by skeeveman
Me personally, I would step the induction down a notch, and get a single carb intake, and a 850 vacuum secondary. And take the stall way down. This way you can really take advantage of your displacement and use up some low rpm torque.

This is going to be a street car right?
You still have to keep in mind the powerband of the camshaft. Doing this would mismatch his parts and overall cause him to lose power throughout his powerband.
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Old 02-01-2005, 06:45 AM
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Thanks for the responses .. I guess i'll just have to wait and see how it works out .. Hopefully i wont break anything lol !! What do u normally risk breaking if your stall is too big for your power band ?? Besides the tranny ...
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Old 02-01-2005, 07:51 AM
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I don't think you really risk breaking anything that you wouldent have broken with a slightly smaller stall. A bigger stall will allow for more hp and torque to hit the wheels off the line, which puts more stress on everything, but thats just because you are putting more power down. I would say that is a good thing.

Adam
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