[Diy_efi] BHP calculations

[Greg Hermann]

At 11:23 PM 7/29/95, Bruce wrote:
>----- Original Message -----
From: "Mark Claywell" <clay0052 at umn.edu>
>Subject: Re: [Diy_efi] BHP calculations
>>  While O2 levels will no doubtably effect torque/power/IMEP or whatever, I
>> think it is a non-issue here.
>
>Oh?.
>If you make a tuning change, how do you know if the HP change was do to the
>change in tuning, or a change in the operating envirionment?.
>Bruce
>
You guys are ttalking apples and sharks !

Measuring delivered HP at the wheels depends on vehicle speed, rolling
resistance, and aero drag. For HP delivered at the flywheel, one must
include drivetrain losses. Likewise for gross engine HP, one must add fan,
alternator, oil pump, water pump, & other accessory power consumption back
in.

O2 content in the air, humidity, etc. DO have a MINOR effect on aero drag,
but YES--they have a MAJOR effect on what % throttle the engine will need
in order to produce the HP needed to come up equal to the above list of
stuff.

Greg



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