General > Old Event Details
Forum Rolling Road day @ Superchips 6th June 2009
Hurdy:
--- Quote from: WhiteGTI on June 09, 2009, 11:32:49 pm ---Oh :sad1:
So realistically because my wheel hp is lower than Joe's it means that my car has got less power than his?
--- End quote ---
Not necessarily.
Your engine may have a little more power, but the losses are more significant due to heat soak, intake temps, parasitic losses from other areas like air con, flywheel etc.
Joes will see more power getting to the wheels due to less losses from intake temps and heat soak especially. However the reading point is the wheels so the losses are calculated backwards to get the engine power.
The only MEASURED power is from the wheels. :happy2:
WhiteGTI:
Ahh I understand now! Thanks for taking the time to reply John :happy2: :happy2:
[/Goes to find the Thank You button, but it isn't there...]
Poppa Dom:
--- Quote from: WhiteGTI on June 10, 2009, 06:36:47 am ---Ahh I understand now! Thanks for taking the time to reply John :happy2: :happy2:
[/Goes to find the Thank You button, but it isn't there...]
--- End quote ---
Geez Chris - what you doing on here before 7am :smiley:
Superchips:
DYNO 102 - I think we are all past 101!
WHP
1. Used commonly by americans because their many of their dyno's do not measure anything else. (worked there for 2yrs)
2. Valid for comparisons on the same car, same day, same dyno.
Transmission loss - more accurately Rolling loss
1. Not so much the frictional losses in the gearbox/diff BUT the double convex deformation of the tyres on the relatively small radius rollers.
2. "Rolling losses" are affected by tyre pressure and manufacturer but ultimately speed, the loss at 100MPH will be over double of those at 50MPH.
If we want to see high WHP we would pump up the tyres nice and hard and run in as low a gear as possible.
Therefore comparisons between two cars' WHP are simply not possible because of the above.
Jamie
joesgti:
im unsubscribbing to this thread, my heads boggled!! :laugh:
my car is rapid, it feels rapid and goes like stink (ask tom :laugh:) and im happy with my results, :drinking:
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