Miata Mailing List: June 1993, Message #118
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   From: miq@wv.MENTORG.COM (Miq Millman)
Subject: Re: Optimizing Shift Points - Info required
   Date: Tue, 29 Jun 1993 12:08:06 -0400


Craig Boyle says:
> Using the formulae described in the Automath Handbook by John Lawlor I'm
> trying to compute the optimal shift points for a Miata.
>
> Does anyone known Miata torque and hp ratings through the rpm range, say
> from 2000-7000 in 200-500 rpm increments. I need this data for accurate
> computation.

The short answer:  Shift at 7240 rpms (red line is at 7000, rev limiter at
7250)

The long answer:  There is a map of the hp and torque curves in one of the
car mags (c&d I think) from around fall 1989 when the Miata first came out.
But anyone who has raced a Miata in any form will tell you to shift as late
as possible to take advantage of the high rpm power.  Last track event I
experimented (at the request of my instructor) with changing shift points.
The results were shifting at 7000 was a couple of seconds faster than
shifting at 5500.  The increase in lap times was pretty linear with the delay
of the shift point.


--

Miq Millman       miq@wv.mentorg.com         miq_millman@rainbow.mentorg.com
Mentor Graphics 8005 Boeckman Rd, Wilsonville OR 97070  503 685 1492   C2148