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Question about torque converters...
We had a 1970 Camaro with a 540 BBC in it. We went to the track and the car went 10.70 @126mph. It has a TH400 4.11 spool with 30x12.5 ET Streets. The converter was a TCI Super Street fighter.
The car was shifted at 7,000 in second and third gear. It crossed the line at 6,800 rpm. The car was a lot slower then we were hoping. My question is does this sound like a converter issue...maybe not locking up? |
Re: Question about torque converters...
Originally Posted by kwillymac
We had a 1970 Camaro with a 540 BBC in it. We went to the track and the car went 10.70 @126mph. It has a TH400 4.11 spool with 30x12.5 ET Streets. The converter was a TCI Super Street fighter.
The car was shifted at 7,000 in second and third gear. It crossed the line at 6,800 rpm. The car was a lot slower then we were hoping. My question is does this sound like a converter issue...maybe not locking up? |
kwillymac not knowing all the specs just going by the numbers of 10.70 @126 you are getting all the converter is going to give. Now if you have a HP number that you feel does not match your ET than I would say it may be your trans but the converter is locked up. Thats JMO.
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If I use the torque converter slippage calculator it says 14%. Crossing the finish line with 30" tall tires at 6,800 RPM with 4.11 gears doesn't add up with that MPH.
Engine Specs Block GM 502 Crank Scat Crank 4.25 stroke Rods Scat Rods Pistons J&E 10:1 Compression Heads Dart Pro 1 335 CNC Ported Cam Comp Cams Roller 260/268 @.050 .714/.714 Lift Intake Dart 4150 Carb 1000 CFM Race Demon Distributor MSD Billet Distributor with 6AL Box Exhaust 2 1/8 Hooker Super Comps with 3" Flowmasters |
Sounds like they are driving through the converter to me. I would order a converter from Hughes, Chance or ATI.
What are the 60' times? |
The 60' was 1.58. Pretty bad for this combo. That was launching off the foot brake at around 2,500. Just taking it easy.
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I PERSONALLY would like to know how much the cars weigh's ?
and how much HP is your motor making ? Brian |
kwillymac on converter slippage numbers I would not know what I was looking at. I am just going by your MPH and it is right on the money for your ET so I would say what ever slippage that you have has to be right for your ET & MPH. May be one of the guy's that knows more than I do will pipe in on there opinion if they feel my info may be wrong. From your 10.70 @ 126 your car is efficient.
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Originally Posted by bjuice
I PERSONALLY would like to know how much the cars weigh's ?
and how much HP is your motor making ? Brian |
Originally Posted by woodsman
kwillymac on converter slippage numbers I would not know what I was looking at. I am just going by your MPH and it is right on the money for your ET so I would say what ever slippage that you have has to be right for your ET & MPH. May be one of the guy's that knows more than I do will pipe in on there opinion if they feel my info may be wrong. From your 10.70 @ 126 your car is efficient.
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