LS1 Lean Cruise

[rrauscher at nni.com]

When you say trace detonation, was it loud enough to
be heard by the knock sensor? Or did you pick it up
by plug reading?

I have also been playing with hiway cruise modes. One
thing I found was that it is important to drop out of
hiway fuel mode on a regular basis. This allows the BLM
to re-adjust as needed.

Otherwise, at times I'd see O2 readings over 900mv. Not
what was intended. I setup the code for 60 secs in hiway,
then 7 seconds out of hiway, repeat as required.

BobR.

>In OZ GM May enable the lean cruise.  I don't believe your LS1's use EGR in

>OZ?
>It's probably in the code, I don't know.  The 89 YB code has it, as does the

>90-92 FB &  YB
>code, it is just not enabled.  I have heard that the EPA considered it an
>emissions defeat devise
>because it puts out more NOx.
>I enabled it on my car, (89 YB) set it to go to 15.5 to 1 at cruise.  16.0

>to 1 gave me a lean misfire.
>I also had to disable hwy spark, it caused trace detonation at cruise.
>With 3.45 gears and .5 6th gear, I can get between 28 and 31 mpg at 70 mph.

>Mark
>----- Original Message -----
>From: "Ross Myers" <ponty at axis.jeack.com.au>
>To: <gmecm at diy-efi.org>
>Sent: Tuesday, December 05, 2000 10:45 PM
>Subject: Re: LS1 Lean Cruise
>
>
>>
>>
>> >Have run the LS1 a far bit on the dyno and it does not go into lean
>cruise
>> ,
>> >it has very quick response to self learn when a blower is installed but
I
>> >have never seen it leaner than 14.7 :1
>>
>>
>> Thanks Daniel, just as the mag said, it never goes below 14.7:1 , but with

>> economy figures around the 13L/100Km (Sorry U.S folks) mark around town
>who
>> cares!!.
>>
>> Ross Myers
>>
>> --------------------------------------------------------------------------

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