S4 speed question
AudiWorld Senior Member
Joined: Jul 2004
Posts: 752
Likes: 0
From: Pacific NW
I don't know much about how to test the power output of an engine. I understand that measuring horsepower would yield different results based on "where" you measured it from.
Is there a particular reason why no one has measured how much horsepower the engine is developing at the crankshaft? Is that even possible? Or is it too much of a pain-in-the-***? It seems like having those results would put the speculation and attempts at calculating the engine horsepower to bed.
On a related note, I know that the butt dyno isn't quite as accurate as a "machine" dyno, but my stock B6 S4 didn't SEEM as quick as my current S4. Anyhow ...
Is there a particular reason why no one has measured how much horsepower the engine is developing at the crankshaft? Is that even possible? Or is it too much of a pain-in-the-***? It seems like having those results would put the speculation and attempts at calculating the engine horsepower to bed.
On a related note, I know that the butt dyno isn't quite as accurate as a "machine" dyno, but my stock B6 S4 didn't SEEM as quick as my current S4. Anyhow ...
AudiWorld Super User
Joined: Oct 2002
Posts: 10,857
Likes: 0
From: Seattle area
Measuring HP at crankshaft is meaningless. It is a dick waving exercise, as it can't be done accureatly without an engine dyno. There are several more reasonable ways to measure how your car is doing. My two favorites are VAG (VCDS) 3rd gear log and Gtech RR (or Pbox) log. Some people choose to use a dyno, that is OK as long as you only looking for relative numbers, as different dynos are all over the place for same car.
Bruce
Bruce
Last edited by rktskicar; Jan 27, 2010 at 09:20 PM.
AudiWorld Senior Member
Joined: Jul 2004
Posts: 752
Likes: 0
From: Pacific NW
Measuring HP at crankshaft is meaningless. It is a dick waving exercise, as it can't be done accureatly without an engine dyno. There are several more reasonable ways to measure how your car is doing. My two favorites are VAG (VCDS) 3rd gear log and Gtech RR (or Pbox) log. Some people choose to use a dyno, that is OK as long as you only looking for relative numbers, as different dynos are all over the place for same car.
Bruce
Bruce
Thread
Thread Starter
Forum
Replies
Last Post
TACTICLY
S4 (B6 & B7 Platforms) Discussion
1
Nov 24, 2004 12:45 PM
yourk
S4 (B6 & B7 Platforms) Discussion
9
Jun 8, 2004 01:59 AM
BigMouse
Audi 90 / 80 / Coupe quattro / Cabriolet
8
Sep 3, 2002 10:50 AM
