[Shotimes] What Cause a car to run too lean?

[Carl Prochilo]

So is the net of all this that the LPM in its current form isn't really
doing much other than possibly addressing midrange (plus WOT is rich
anyway), and perhaps isn't really needed?  My SHO has the 77 with can, P+
Y pipe and dynomax, and UDPs on a 3.2L.

I really want to instrument the PCM in the worst way to see what's really
happening in there.  I suspect one or more things may be off...  Then
maybe some custom tuning.

About the oil situation, if I'm satisfied my recent work has sealed up the
visible leaks, I will use Mobil 1 synthetic for my next oil change and see
what happens.  Motor has about 100K miles on it.
-- 
Cheers,
Carl Prochilo
92 Ultra Red Crimson

On Fri, January 7, 2005 9:38 am, Ron Porter said:
> That's Ted's opinion. Remember that Doug Lewis also has the opinion that
> synthetic oil is bad for SHO cams.
>
> Now, Ted was one of the SHO performance pioneers, and was the best at the
> "chip tuning via USPS", but those days are ancient history. Folks have
> been
> doing y-pipes for ages with stock programming, and as Dave mentioned, the
> cars run rich at higher rpm once they are above the EPA test rpm. The
> y-pipe
> upgrade might make it run "leaner" in that midrange, but I don't interpret
> that to mean that it runs "lean".
>
> Remember that the additional airflow comes from the metered intake side,
> where the fuel is also increased to compensate. The y-pipe isn't that
> radical of an upgrade that would run outside the PCM's latitude.
>
> Ron Porter
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
> On Behalf Of Carl Prochilo
> Sent: Thursday, January 06, 2005 10:21 PM
> To: Shotimes@autox.team.net
> Subject: RE: [Shotimes] What Cause a car to run too lean?
>
>
> So you are saying this is a myth?  Ted B. seemed convinced that the higher
> flowing Y-pipes caused the engine to run lean due to the additional
> airflow.  Since I don't have any measurements to say otherwise, I can't
> validate it one way or another.
> --
> Cheers,
> Carl Prochilo
> 92 Ultra Red Crimson
>
> On Thu, January 6, 2005 5:43 pm, Ron Porter said:
>> Carl, many SHOs have gone to better y-pipes and have not had to change
>> PCM
>> calibrations beyond the range of the stock setup, as the O2 sensors &
>> MAF
>> can adjust for the change.
>>
>> Ron Porter
>>
>> -----Original Message-----
>> From: shotimes-admin@autox.team.net
>> [mailto:shotimes-admin@autox.team.net]
>> On Behalf Of Carl Prochilo
>> Sent: Thursday, January 06, 2005 4:59 PM
>> To: shotimes@autox.team.net
>> Subject: Re: [Shotimes] What Cause a car to run too lean?
>>
>>
>> New Y-pipe.
>> --
>> Cheers,
>> Carl Prochilo
>> 92 Ultra Red Crimson
>>
>> On Thu, January 6, 2005 4:36 pm, Leigh Smith said:
>>> weak fuel pump
>>> bad O2 sensors
>>> vacuum leak
>>> dirty maf
>>> anything else?
>>>
>>> Lee
>>>
>>>
>>> ----- Original Message -----
>>> From: "Frank "SHOrage" Costa" <SHOrage@brothersofmetal.org>
>>> To: "1 SHOTIMES" <shotimes@autox.team.net>
>>> Sent: Thursday, January 06, 2005 12:02 PM
>>> Subject: [Shotimes] What Cause a car to run too lean?
>>>
>>>
>>>> What Cause a car to run too lean?
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