8.1L Build Up Article In Car Craft
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8.1L Build Up Article In Car Craft
Hey all, just thought you'd all like this 8.1L build up article in car craft:
GM Vortec 8100: The 454's Forgotten Big Brother
GM Vortec 8100: The 454's Forgotten Big Brother
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The thing that no one remembers is that you're losing a ton of power from the flexplate back - typically quite a bit more than the smallblocks (not to mention the small block crowd only quotes crank figures).
Stock output is 320hp / 455ft-lbs at the crank, 202rwhp / 303rwft-lbs.
202rwhp x 1.58 = 320hp crank / 303rwft-lbs x 1.5 = 455ft-lbs crank.
Assuming the same rate of loss:
Modified crank output of that 547 stage 1 (towing oriented) package 521hp / 627ft-lbs with headers attached to completely stock exhaust.
Stock output is 320hp / 455ft-lbs at the crank, 202rwhp / 303rwft-lbs.
202rwhp x 1.58 = 320hp crank / 303rwft-lbs x 1.5 = 455ft-lbs crank.
Assuming the same rate of loss:
Modified crank output of that 547 stage 1 (towing oriented) package 521hp / 627ft-lbs with headers attached to completely stock exhaust.
#6
What I'd really like is some real world towing experienes with the Raylar stuff. Ive been searching for months and can't really find anything. I'm completely "underwhelmed" by the stock towing performance of the 8.1 and 4L80E. The HP/TQ numbers aren't all that important. I want towing reviews. Mountain passes, speed, RPM, trailer weight etc.
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What I'd really like is some real world towing experienes with the Raylar stuff. Ive been searching for months and can't really find anything. I'm completely "underwhelmed" by the stock towing performance of the 8.1 and 4L80E. The HP/TQ numbers aren't all that important. I want towing reviews. Mountain passes, speed, RPM, trailer weight etc.
We just got the 540cid shop Suburban back from a trip to McCall, Idaho and back to southern California with a 25ft Rinker behind it. Average fuel consumption for the trip was 10mpg, though the best part was the ease of accelerating uphill.
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What I'd really like is some real world towing experienes with the Raylar stuff. Ive been searching for months and can't really find anything. I'm completely "underwhelmed" by the stock towing performance of the 8.1 and 4L80E. The HP/TQ numbers aren't all that important. I want towing reviews. Mountain passes, speed, RPM, trailer weight etc.
Last edited by Fast355; 08-26-2015 at 10:42 PM.
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