Convertor recommendations
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Senior User
Joined: Jun 2005
Posts: 176
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From: Temple, TX
Convertor recommendations
Also posted in the '73-'79 forum...
Truck is a '78 2wd C6 3.50 rear...
Engine will be:
'78 460 ~8.5:1
Mildly ported D3 heads
Edelbrock Performer
Holley 750
Comp XE262H
Headers w/ 2 1/4 duals
I'm expecting torque peak somewhere around 2800 rpm and hp at or just below 5000.
Basically, this will be an all-purpose daily driver... I want to be able to tow 6-7000 pounds reliably, potentially long distances. I'd also like to be able to take it to the drag strip once in a while and have some fun (hopefully somewhere in the mid-14 second range?)
Just looking at Summit's selection, I like the TCI Sizzler 1700 rpm convertor, and the TCI "High Torque Towing" 1200 rpm convertor. I think something in the 1700 rpm range would be ideal, but at the same time I'm worried that a "street/strip" convertor wouldn't last too long towing any kind of significant load. Do you guys think a convertor rated at 1200 is too tight for that cam? For comparison, what does a stock convertor stall at?
Thanks guys
Truck is a '78 2wd C6 3.50 rear...
Engine will be:
'78 460 ~8.5:1
Mildly ported D3 heads
Edelbrock Performer
Holley 750
Comp XE262H
Headers w/ 2 1/4 duals
I'm expecting torque peak somewhere around 2800 rpm and hp at or just below 5000.
Basically, this will be an all-purpose daily driver... I want to be able to tow 6-7000 pounds reliably, potentially long distances. I'd also like to be able to take it to the drag strip once in a while and have some fun (hopefully somewhere in the mid-14 second range?)
Just looking at Summit's selection, I like the TCI Sizzler 1700 rpm convertor, and the TCI "High Torque Towing" 1200 rpm convertor. I think something in the 1700 rpm range would be ideal, but at the same time I'm worried that a "street/strip" convertor wouldn't last too long towing any kind of significant load. Do you guys think a convertor rated at 1200 is too tight for that cam? For comparison, what does a stock convertor stall at?
Thanks guys
Post Fiend
Joined: Jul 2006
Posts: 6,948
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The XE series cam from Comps is actually recommended for use with stock style converters. If you are going to tow, you will want the stall speed to be pretty low. If you get too high, the converter will slip while towing (3.50 gears and unknown tire diameter, so this is speculation) assuming a tire approx. 32 inches.(taller tires would only make matters worse) This will generate a considerable amount of heat, and you will struggle with a hot transmission while towing.
That thing is going to make a bunch of torque, so go with it, don't try to raise rpm's for a better 60 foot time. It will probably just spin the tires anyway, and trying to make additional horsepower during acceleration will only make matters worse.
That thing is going to make a bunch of torque, so go with it, don't try to raise rpm's for a better 60 foot time. It will probably just spin the tires anyway, and trying to make additional horsepower during acceleration will only make matters worse.
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macwilj
1987 - 1996 F150 & Larger F-Series Trucks
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Jul 28, 2007 08:26 PM
