Just started an SD tune any thoughts?

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Apr 16, 2007 | 05:07 PM

#21

dc_justin

Hello Dave

iTrader: (13)

Joined: Jul 2004

Posts: 1,119

Likes: 3

From: San Diego, CA

Quote:

Originally Posted by Country Boy

Sound pretty stupid still though since when you go WOT, the fuel mixture needs to richen up right then and there to avoid the lean condition because of the serious rush of incoming air. Doesnt seem safe.

Well, in MAF mode, the PCM calculates in that additional "surge" of air and adds fuel accordingly (temporarily). Then, for the rest of the closed loop WOT duration, timing is kept low to keep combustion chamber heat from becoming excessive. This is the reason there is often significant spark advance added in during PE mode via the fuel mixture spark correction table (AFR spark modifier or something like that in HPT).

Apr 20, 2007 | 01:54 PM

#22

Scott Mills

Thread Starter

Launching!

Joined: Aug 2002

Posts: 278

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From: Summerville, Sc

Here is my latest tune. I am in the 11.5 AFR range when entering PE mode, is that acceptable? How do you tune for the timing? I mean if I wanted to advance the timing a little what do log to know how much to advance it.

change .txt to .cfg

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