At 01:26 PM 2/27/02 -0800, Ron Chapman wrote:
>Hi gang, I have two questions for the technically minded:
>
>1) What's a good rule of thumb for converting from wheel hp to crank hp?
>
>2) I'm trying to do some dyno tuning on my SP CRX. We've done a baseline
>run without an air fuel meter being used. The new engine pieces have been
>bolted on, and I know we need to use an air fuel meter for the
>tinkering. I'm still using stock injection, so its not like we'll be
>doing any mapping, just making sure that the new pieces have moved us
>forward, not back, and seeing what effect timing changes have.
>
>The question is, would an Autometer air fuel type gauge which attaches to
>the stock wiring harness be sufficient? Or, do I really need to add a bung
>to the header and let the shop use their megabuck Motec device? It seems
>to me that with stock injection, the simple splice in should suffice due
>to the limited changes we can make.
>
>Thanks,
>
>Ron Chapman
>
>85 CRX CSP
>91 Civic HS
>99 Miata CS
=====================================
Ron,
Relative to your first question, I worked with a company that
runs a Dynojet chassis dyno that, in turn, works with an engine shop
with a direct engine dyno. They say that on most of the front wheel
drive cars where they have tested the engine on both dynos, the
difference is approximately 15%. So, multiplying the wheel hp by
1.15 to estimate the crank hp will get you close.
Vince Bly #49 STS
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