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  1. #1
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    Default Road tuning - ignition timing & AFRs

    Hey guys,

    I'm running a local full EMS system on my car. I usually have it tuned on a dyno by professionals, but often find that the map needs adjusting on the road afterwards as conditions are somewhat different.

    So I've taken to road tuning it myself lately. I have a wideband in the car and I've pretty much gotton the hang of tuning the AFR's myself.

    Now, I tune the AFR's for 14.7-15.0 on light throttle and low RPM. Then through the medium throttle positions I go to low 14s and then for full throttle high rpm I target 12.7-13.2. The car feels ok, but are these the optimum AFR's for power on full throttle?

    Now, my main issue is ignition timing. How will I know what is optimal and what makes the most power, without being unneccessarily harsh on the motor? Or is it simply a case of advance , advance, advance until it knock is audible and then backing off a few degrees?


    Muy tuning maps are quite simple to use. Just RPM And throttle position. The EMS interpolates the inbetween values itself.

    '93 Sentra - Full build thread here: http://www.nissanownersclub.co.za/fo...ic.php?t=13186
    '11 E92 335i Coupe DCT - daily

  2. #2
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    Default

    I should mention it is for a N/A sr20ve.
    '93 Sentra - Full build thread here: http://www.nissanownersclub.co.za/fo...ic.php?t=13186
    '11 E92 335i Coupe DCT - daily

  3. #3
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    What is the CR??
    What fuel used??
    What load??

  4. #4
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    Default

    Factory stock VE
    95 Ron
    Not sure how to specify load?

    1660 ft altitude so less sensitivity to knock.
    '93 Sentra - Full build thread here: http://www.nissanownersclub.co.za/fo...ic.php?t=13186
    '11 E92 335i Coupe DCT - daily

  5. #5
    The People's Mod
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    Quote Originally Posted by Doctor G View Post
    The car feels ok, but are these the optimum AFR's for power on full throttle?
    Seems in the ballpark to me.

    Quote Originally Posted by Doctor G View Post
    How will I know what is optimal and what makes the most power, without being unneccessarily harsh on the motor?
    If you know what your EGTs are at best torque then you can tune to those same EGTs everywhere in the rev range and get best torque. That info requires a dyno at first though, and an EGT setup obviously.

    Quote Originally Posted by Doctor G View Post
    Or is it simply a case of advance , advance, advance until it knock is audible and then backing off a few degrees?
    You can absolutely do this. This works on engines that are knock limited, which our engines are with normal pump fuels. Just make sure your knock sensing method is reliable.

  6. #6
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    Had a test run against my GF in her s2k this morning and the cars are pretty even up to around 140mph so I think it's running ok for a stock ve now.
    '93 Sentra - Full build thread here: http://www.nissanownersclub.co.za/fo...ic.php?t=13186
    '11 E92 335i Coupe DCT - daily

  7. #7
    ETPerformance
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    When i street tune the ignition maps, i find that advancing ign. timing until the AFR's start to get unstable to work the best.
    Need a tune? Contact me, I offer Dyno, Street, Remote, E-Tunes and base maps. I work with Calum, Nistune, Nismotronic, AEM, Haltech, Crome, Hondata, E-Manage, TunerPro and can work in other programs as needed. I can also burn chips and ship them as needed.
    ETPerformance772@gmail.com or PM

  8. #8
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    What do you mean unstable? You mean fluctuate
    92 sentra se-r
    Sr20ve,BRMS twisted ram t3 manifold,downpipe and dump tube,turbonetics 38mm,PTE 5431e,vrs 3inch catback,turbo tank z32 maf blow thru housing,innovate lc-1,nistune r/t,precision 600hp Fmic,precision 680cc,walbro 255lph,Synapse DV bov

 

 

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