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

[Ron Porter]

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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