ectune on a D15Z1?

[elevation]

Just tune it like any other vtec engine. Forget about lean burn, its nog going to work like that unless you are gonna use wideband closed loop that is set at 16:0 or so.

Why would nt lean burn work? I'm gonna try 15 to 18:1 the first 2500 through 4000 depending on load. Then run normal on 2nd maps when the gop locks the third rocker arm. Also why would you switch to the second cam so low and not like normal when the torque lines cross? Thanks for any explination.

[Gaskleppie]

You can try running @ 20:1 AF at really low loads (1st and 2nd column, but take care about timing. I have no idea what kind of timing you can use with these poor conditions. I think a bit less than normal but Im not sure. You will see that the torque crossing is very low.The low cam is so low that the vtec cam almost always make more power. Look at my cal. Vtec is only activated that low on higher loads. When you drive easy, it activated at a higher rpm range.

[greasemonkee]

??? Why less than normal timing? Doesn't flame front speed slow significantly with leaning mixtures? Granted it is high swirl thus superior flame propagation reducing timing requirement to some extent, but I don't see where you're coming from. FWIW I would expect to see a sort of timing \"gap\" between swirl and tumble modes unlike it's mediocre vtec brothers. From what I remember, the stock vtec config on the Z1 engine was 2500 rpm regardless of load. Emissions constraints?