Best A/F Mixture Target for NA Custom Tune? - 2003-04 Mach 1 Registry Owners Club

Jeff.Scherf · 10-21-2014, 05:12 PM

Hello Gang, looking to lean on some good advice.
QUESTION: What is the most ideal A/F Ratio I should target for on a custom Tune for my N/A Mach 1? Lots of opinions hoping to get some good advise / experience.
SETUP: '03 with 5speed (Steel Crank), no power adders, Flat Top Manely's with Manley H beam rods, Intake and Heads Polished, PHP Intake spacer, Accufab Twin 60 TB, Comp Cam 106100s straight up no cam advance. Factory Fuel and Coil packs, JLT Intake.

Let me know your thoughts everyone, this forum is irreplaceable for such an incredible wealth of knowledge out there .. thanks in advance.

Jeff

01yellerCobra · 10-21-2014, 05:30 PM

When I was N/A I aimed for 12.5-13.0.

Mach828 · 10-21-2014, 05:36 PM

Mine made the most power at 12.8 NA

VA-Mach1 · 10-21-2014, 10:04 PM

A google search resulted in a 14.7:1 ideal 'Stoichiometric' ratio.

01yellerCobra · 10-21-2014, 10:07 PM

Quote:

Originally Posted by VA-Mach1

A google search resulted in a 14.7:1 ideal 'Stoichiometric' ratio.

Did you put in WOT AFR? 14.7 is ideal for all the other times.

PeteEpple · 10-22-2014, 09:25 AM

Quote:

Originally Posted by VA-Mach1

A google search resulted in a 14.7:1 ideal 'Stoichiometric' ratio.

14.7 is ideal at idle. I like 13.0-13.3 on an mostly stock NA car. If its a built motor, high rpm deal I'll go 12.7-13.0.

VA-Mach1 · 10-22-2014, 10:22 AM

Quote:

Originally Posted by 01yellerCobra

Did you put in WOT AFR? 14.7 is ideal for all the other times.

I did not. The first post does not mention WOT.

Jeff.Scherf · 10-22-2014, 11:32 AM

Guys all good information I think I've got a good idea of the ballpark to run the Dyno target to. I've also read leaner at idle then targeting just under 13.
To all thanks as always still the best place to turn to ..

Jeff

bluoval · 10-23-2014, 08:12 AM

For me 12.2 - 12.6 NA at WOT worked best.

10-21-2014, 05:12 PM	#1
Jeff.Scherf Registered User Join Date: Apr 2011 Location: Whitby, Ontario Posts: 39	Best A/F Mixture Target for NA Custom Tune? Hello Gang, looking to lean on some good advice. QUESTION: What is the most ideal A/F Ratio I should target for on a custom Tune for my N/A Mach 1? Lots of opinions hoping to get some good advise / experience. SETUP: '03 with 5speed (Steel Crank), no power adders, Flat Top Manely's with Manley H beam rods, Intake and Heads Polished, PHP Intake spacer, Accufab Twin 60 TB, Comp Cam 106100s straight up no cam advance. Factory Fuel and Coil packs, JLT Intake. Let me know your thoughts everyone, this forum is irreplaceable for such an incredible wealth of knowledge out there .. thanks in advance. Jeff

10-21-2014, 05:30 PM	#2
01yellerCobra Registered User Join Date: Jan 2013 Location: San Diego, CA Posts: 1,104	When I was N/A I aimed for 12.5-13.0. __________________ New Ride: 2004 Mystichrome Cobra-Accufab SBTB and plenum, Steeda 2.8" upper, Bassani X, Borla Stingers, Mcleod RXT, MGW shifter, Level 5 halfshafts, chrome FR500's, Stiffler's FIT system and DS safety loop, GT pumps, BA3000, tuned by owner

10-21-2014, 05:36 PM	#3
Mach828 Dark Knight Join Date: Nov 2009 Location: Albuquerque, NM Posts: 5,759	Re: Best A/F Mixture Target for NA Custom Tune? Mine made the most power at 12.8 NA __________________ Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage

10-21-2014, 10:04 PM	#4
VA-Mach1 Mach & Cheese Join Date: Mar 2014 Location: Richmond VA Posts: 797	Re: Best A/F Mixture Target for NA Custom Tune? A google search resulted in a 14.7:1 ideal 'Stoichiometric' ratio.

10-22-2014, 11:32 AM	#8
Jeff.Scherf Registered User Join Date: Apr 2011 Location: Whitby, Ontario Posts: 39	Re: Best A/F Mixture Target for NA Custom Tune? Guys all good information I think I've got a good idea of the ballpark to run the Dyno target to. I've also read leaner at idle then targeting just under 13. To all thanks as always still the best place to turn to .. Jeff

10-23-2014, 08:12 AM	#9
bluoval Registered User Join Date: May 2006 Location: Peoria, IL Posts: 1,101	Re: Best A/F Mixture Target for NA Custom Tune? For me 12.2 - 12.6 NA at WOT worked best.

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