how accurate is the estimated fuel change?

s300 and SManager software questions & answers
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JDMLyfeStyle
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how accurate is the estimated fuel change?

Post by JDMLyfeStyle » Mon Oct 24, 2005 7:32 pm

Ive been tryin to log the fuel changes and to get a smoothe AFR.. but ill do it cruising and WOT and everytime it says to take away like 15% ill take away 10% and then it goes lean.. so im trying to figure out why that is happening..

ECT is constant 177 degree's
IAT is 65-72 < J's racing intake with IAT mounted in the coupler of the intake since my intake manifold does not have one.

I didnt save my logging files.

I may be logging it all wrong but just incase can someone tell me the proper way to use this feature? cause i dont think im doing it wrong but i could be

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Spunkster
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Post by Spunkster » Tue Oct 25, 2005 9:51 am

Is it only one cell that says needs to be changed?

JDMLyfeStyle
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Post by JDMLyfeStyle » Tue Oct 25, 2005 9:09 pm

nah when i log it it shows up several cell's to take fuel away. and when i take fuel away ill only take away part of it. i never take the full amount that it says to take away and for some reason it will go lean :(

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Hondata
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Post by Hondata » Wed Oct 26, 2005 8:01 am

What lambda sensor and what injectors are you using?
Hondata

JDMLyfeStyle
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Post by JDMLyfeStyle » Wed Oct 26, 2005 1:32 pm

Stock 240cc injectors and PLX m300 wideband

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Hondata
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Post by Hondata » Wed Oct 26, 2005 7:07 pm

The recommended fuel change is normally fairly close. Here's some hints: Make sure that SManager reads the same AF as the m300. With the latest version there is an voltage offset adjustment to make matching the AF values easier. Don't add/change fuel from a datalog with a lot of transitional driving. The best way to do part throttle fuel tuning is to datalog with a constant throttle opening from low rpm to around 5000 rpm. Try to keep the map tracing going down a column (2 columns actually). Only start datalogging once you have a steady throttle opening, and finish datalogging before you let off the throttle.
Hondata

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