[V8] Re: '93 5-speed writeup

[stevebednarski at mindspring.com]

I must admit that I haven't gazed down at the tach when driving hard.  I'll
try to take my eyes off the road to see what the tach is reading..

 

Best,

 

Steve

 

  _____  

From: DasWolfen at aol.com [mailto:DasWolfen at aol.com] 
Sent: Thursday, March 25, 2004 12:13 PM
To: David.Coleman at blackrock.com; stevebednarski at mindspring.com
Cc: v8 at audifans.com
Subject: Re: [V8] Re: '93 5-speed writeup

 

In a message dated 3/25/04 8:50:33 AM Eastern Standard Time,
David.Coleman at blackrock.com writes:




This morning I was gazing coffee-less at my tach and thinking about that
5800rpm rev limiter thing -- I think I must have been misreading your tach
the other night.  The third-gear limiter still seemed to come on early, but
probably closer to 6100-6200.   And even though I took it past 6300, it
didn't hit the limiter in 1st or 2nd.  So the killjoy still seems to be
there.

In the interest of science, I set out in search of the limiter on my car,
and reached 7300 in 1st thru 3rd before chickening out and upshifting.  No
limiter so far... and that's pretty deep into the red, which is why I've
never been there before.

Maybe this is part of the PT/ABZ ecu difference -- or to be pragmatic, maybe
VAG thought it was in the best interests of the 4.2 to limit it where it
does.   I wonder if Ned's 4.2 chip nixes the limiter?



  I'm gonna go out on a limb and say what you were seeing was probably a
tach issue. There's no way for a V8's ECU to have any idea what gear the car
is in. Even in the automatic cars the info all flows in one
direction...Motronic to Trans ECU.

The only other possibility I see is the Motronic anticipating the
approaching redline, in the two lower gears things could be happening faster
than the computer is programmed to respond with the limiter and in the two
higher gears the rate of RPM increase isnt fast enough to cause it to
respond early.....that 4.2 does pull pretty hard in 3rd huh! =0)

The IA chip didn't seem to change the limiter in my old 1990...it was
consistant at around 6700. Not that I think its a good idea to be watching
the tach that closely when my foot is buried to the floor. 

Keith