4A-GE with 264º HKS Camshafts running very rich

[Rasteirinho]

Hi André,

Can't you adjust the CO to an even leaner position because at idle and with light load you can run with lean mixtures (above 16).

You can also try to adjust the timming in order to achieve a more complete combustion.

If your injection system runs well with OEM camshafts it does't makes much sense that it would run richer with more wild ones.
Normally it's the the inverse that happens.

For example, in my Pug 106 GTi when i fitted wild cams (280º) i had to fit a fuel pressure regulator in order to increase the pressure to avoid melting the pistons due to lean mixtures.
After some time, i fitted an upgraded ECU and so i decreased the fuel pressure again to standard values because the new timming maps and injection pulse were changed to fit the cams.

Timming is very important when new camshafts are fitted.

Cheers,
Pedro