Discussion and questions related to the course Road Tuning
Ive read through the forums and still cant find the answer to my problem. I am working with a 97 jeep wrangler tj. Its the 4 banger 2.5l model but it was stroked to a 3.1l, has slightly larger injectors, 1.7:1 roller rockers up from the stock 1.6:1 stamped steel rockers, ported and polished intake, ported and polished larger throttle body off a 4.0l, short header, and larger tires but geared properly. It runs good but is lacking power. So my question is when tuning the main fuel table I turned off closed loop, disabled decel fuel cut, disabled power enrichment, and retarded the timing 3*. I am using hp tuners so i logged my aem afr gauge through the pro link and made a hysterogram using afr rpm and map in kpa just like the main fuel table. I now have all good values up to where pe normally kicks in at wot or very high map values. so my question is do i set my main fuel table to stoch through out and then use the pe table to add fuel when needed above what ever kpa it is set to or do I set the main fuel table to what i want the afr to be at at a given rpm and map? Seems that if I do the latter then add to the pe table its going to make it way too rich? Im just not grasping the concept here at all? If needed I can supply pictures of the tables from the vcm editor and scanner. Also am I targeting a smooth transition from stoch to full fuel enrichment slowly or should it be a quick transition? Any ideas what full enrichment should be in this application 12.5, 13.0, 13.5.... or lambda .85, .88, .91...?
Thanks in advance.
My 2.5 afr at wot is 12.5 -12.8 sir.. it is on a tropic country
Air temp arround 30-35 C
I am using megasquirt on 2.5L Jeep
4.0L i am using haltech, and unichip sometimes.
Hope it helps