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RE: Rev Limiter on '87 Corvette
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I can tell you exactly in the code where the rev limiter is...
At c3af the value should be ff..... this should be the fuel shutoff point
255x1 =255mph
C3b0 should be 62..or x=655368120/(ex numb cyl)
Or 10 031rpm
The restore rmph is at c3b2 value fe=254 or 254mph
Restore rpm is at c3b3 value 67 or 103 so
65536*120/(103*8)= 9544rpm
Mike Rolica
Plant A,
Magnesium Products Division
Strathroy
(519)-245-4040 Ext. 265
-----Original Message-----
From: Roger Heflin [SMTP:rah@horizon.hit.net]
Sent: Tuesday, June 06, 2000 2:17 PM
To: gmecm@diy-efi.org
Subject: Re: Rev Limiter on '87 Corvette
On Tue, 6 Jun 2000, Jeremy Gonyou wrote:
> I was kinda thinking the same thing about my car. (the
revving part not the
> new motor part). I was going to modify the speed limiter
section to include
> a rev limiter by throwing in a extra branch statement.
>
> Well, Pontiac says a rev limiter kicks in at 6200 rpm...I
haven't found it
> yet, and when I tried, I found my tach needle on the wrong
side of the
> little peg.
>
I don't know about the 87 specifically. On my 93 LT1 f-body
the rev
limiter is using something called "reference time" which
roughly seems
to translate to 1/4 of the time for a revolution. This
value is what
the data value in the chip was compared against. The
reference time
was also included in my cars standard data stream. This is
also the
value that RPM is figured from. I suspect that there is
something
similar on the 87 also, so look at where rpm comes from and
then see
what is using that.
Roger
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