[urq] EFI + MAC-14 maxing ataround 5k RPM

[Ben Swann]

The pulse width measurement I gave was with no load.

-----Original Message-----
From: Huw Powell [mailto:audi at humanspeakers.com] 
Sent: Tuesday, October 23, 2007 7:03 PM
To: Ben Swann
Cc: 'mike schowengerdt'; urq at audifans.com; quattro at audifans.com
Subject: Re: [urq] EFI + MAC-14 maxing ataround 5k RPM


> I’m wondering if the pulse width setting on the injection system is not right and the
> injectors are simply maxing out at RPM.  That seems like another possibility than
> ignition.  I need to check this in my MS settings.  I did some math:
> 
> I have a Max pulsewidth of 11.9 msec that I see in the log.  
> 
> 5500 rev/min|min/60sec|sec/1000ms|=.0917rev/ms  -> 10.9ms/rev @ 5500 RPM or roughly
> 11ms.
> 
> Roughly @6000RPM is 10ms/rev
> 
> So if my max pw is 11.9 but if a rev. happens in only 11 ms then the injector pw >
rev,
> so injector is open 100%.  

But isn't the pulse width also load dependent (ie, no load at 5k uses 
less fuel than heavy load at same rpm)?  So your observations "at rest" 
revving up don't fit that hypothesis.

Not to say you aren't right, just fooding for thoughts.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/