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Discussion Starter · #1 ·
All of the online calculators (the most accurate ones anyway) rate rear wheel HP. Then they make silly assumptions for driveline loss to guess an engine HP.

What percentage loss is realistic to use?

I've got a 555 BBC with a 5,000 stall and a Powerglide through 4.86 9" and 15" M/T slicks.

On my street car with an auto, we assume 17.5% loss.
I have no idea what's realistic on my race car though.

Thoughts?
 

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Discussion Starter · #2 ·
Surely someone knows how much difference there really is between engine dyno numbers and chassis dyno with a bbc and a powerglide?

If the engine dyno says 900, what would the chassis dyno say?

OR.....

If a chassis dyno says 750, what would you expect on the engine dyno?
 

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I have a friend who is very smart. He once said "Dyno numbers are kinda like saying how much you can bench press. It doesn't really matter if I can still kick your ass!"
Man, aint that the truth... Seen so many big fuckers get their ass beat it's not even funny. All that time in the gym for naught.
 

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i always go by 15% just as a rule for dynojets - 10% for mustang - 5-8% for the new dynopack ones that attach right to your hubs...
 
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