[V8] Chips and computers

[qshipq at aol.com]

 Maybe Cavallo is willing to share, as a rule I don't.  Not to be rude, I fix problems on cars for a living, which makes me selfish to 'freeware'.  My point to posting in this thread?  A lot of folks bring forth answers to problems that 'can/do work'.  Cavallo's post was dead nuts on in identifying 'how' urban legends come to these forums.  *An* answer is just that, there are a lot of folks here that eventually convince others 'an' answer becomes 'the' answer.  Which then follows a false predicate, tangentially creating self-proclaimed gurus.  

The 3.6 computer harness and ecu 'can' be used on a 4.2 5 speed conversion.  I claim that the 4.2 computer harness and ecu can be used on a 4.2 5 speed conversion as well.  I also claim anyone that touts the timing is 'better' in the 3.6 tabling creates more myth and urban legend.  And to Cavallo's point, backs up to looking at what created the myth in the first place.  


Cheers and my .02

Scott J

 

 

-----Original Message-----
From: Samuel Mrowka <smrowka at gmail.com>
To: qshipq at aol.com; CavalloGT at gmail.com; V8 at audifans.com
Sent: Sun, Sep 19, 2010 5:41 pm
Subject: Re: [V8] Chips and computers



Are either of you fellas able to make a write-up of how to correctly use the 4.2's computer in a 5-speed? As you guys mentioned, the current school of thought uses the 3.6 computer and harness with the '92 engines. I think that would be a HUGE benefit to the V8 community!


Personally, I've been running a 4.2 motor with a 3.6 harness and ECU like several other listers. I'd be thrilled to learn how to correctly use the 4.2 harness and ECU though.


Samuel


Message: 6
Date: Fri, 17 Sep 2010 10:23:48 -0400
From: qshipq at aol.com
Subject: Re: [V8] Chips and computers
To: CavalloGT at gmail.com, V8 at audifans.com
Message-ID: <8CD248B13F72B97-CEC-F360 at Webmail-d112.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"


 Good post!  I too have used the autobox motronic in a 5speed car.  WRT the 4.2 auto v manual...  Many have said the 3.6 motronic has 'better' timing tables in it.  That's really not the case looking at the code IMO.  Cavallo hit the nail on the head, as 'without' the shift input from the trans ecu, the 4.2 motronic will retard timing.  The 4.2 also uses a potentiometer for the throttle instead of the 3.6 WOT switch.  This also affects tabling in the 4.2 ecu.  IME, both issues are easily addressed, as well as the revised idle issue on the 4.2 motronic.

Self proclaimed 'gurus' also make me chuckle.  There are very few folks that seem to understand the differences between the 3.6 motronic ecus and the benefits of the 4.2 motronic ecu.  There was a lot of chatter speaking to rewiring 4.2 5 speed engine conversion with the 3.6 harness a couple years ago on the QW forums.  A hack that 'can' work, never did understand doing all that retrofit work, as the 4.2 motronic is a better box IMO/E

Scott J
The "other" disbeliever in self proclaimed gurus
92 v8 4.2 ABT chipped