Manual or Auto? - Lateral-g Forums

6D9 · #1 12-25-2007, 08:48 PM

Steve...with your new style "protouring" converters how does exceleration feel from a dead stop as compared to a regular street/strip converter?? Does it flash up at all??? If you did like to go to the strip at all does it make it hard to get into the cams powerband??

**Steve Chryssos** · #2 12-26-2007, 05:18 AM

All converters are built to spec, so if one were to demand a looser converter, I wouldn't refuse. But as a rule of thumb, converter stall runs about 500 rpm lower than your typical street/strip converter. Coupling efficiency is greater across the board as well, so flash stall rpm tends to run lower as well. Your drivetrain will tug harder on the engine.

All this should theoretically hinder E.T. and 60 foot times, but given te traction limitations of the typical pro-touring tire, the tighter converter can help overall.

A more specific response would require a detailed conversation with you regarding vehicle specs. Feel free to give us a call.

Thanks
/Steve

6D9 · #3 12-26-2007, 08:59 AM

Thanks for the info Steve....yeah when I go to the track I put on big n littles so im sure it would slow the car down. But im sure it would drive a whole bunch better with the tighter converter. If I could just stay away from the damn dragstrip it would be an easy choice!

SDMAN · #4 12-28-2007, 06:20 AM

Im doing both. The motor in my current project is using both front and rear motor plates to mount it into the A/M frame. I will swap between the 4L80E and T-56, and with the motor supported on both ends, tranny swaps get real easy under the lift. Im betting I could do it in a couple of hours by myself.

I want the T-56 because its a ton of fun to manually shift a hi HP car (Procharged 542ci pump gas combo....approx 900 HP). But, I will also be making some serious 1/4 mile passes, and want the increased performance and consistency that the auto will have. Frame goes into the race car shop on Jan 3 for the 4-link and watts setup install. The minitub on the body is also underway to make room for the rear tires (the rear seat is going to be pretty narrow).

Question for someone who knows the answer to this. We have to cut the floor out of the car to get it onto the A/M frame. Then, with the drivetrain installed, put a floor back in leaving the required clearance in the tunnel. We would like to use the larger (physically) of the 2 tranny setups to do this. One will be the 4L85E and the other will be the T-56 on a McLeod modular bellhousing.

Which setup is the larger one?