bogus wrote:
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anesthes wrote:
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CentralCoaster wrote:

I'm not sure how you can tweak the NOx without the EGR. Overlap could work, but I'm not sure how else you'd drop combustion temps.

Higher octane fuel + more spark advance. Lower operating temperature.


If I can make a 500hp motor, with no EGR, a big cam, supercharger, No air injection, pass on an IM242 emissions dyno than Randy shouldn't have a problem making his stock L98 pass..

Mass uses the same 'standards' as California regarding the dyno and tailpipe test, although the visual is rather "laxed". They don't check ignition timing. They never even opened the hood on mine. Just ran it on the rollers simulating going up and down hills, slowing and accelerating. My car always passed with flying colors.

A lot of you guys like to debate stupid shit like why guys like me run lower thermostats, lower fan temps, etc and I can't help but bang my head against the wall over it considering how much power my combos make and how they pass emissions compared to guys with stock motors.

Hopefully the 20 year old I sold my Corvette to doesn't put it into a tree.

-- Joe

Joe - you are basically building from a net-zero basis. You have the skill to re-engineer the thing properly to deal with the output.

I find fiddling with stock engines only pushes the settings out of range and compensating gets tricky.

I do not recommend lower t-stats and fan settings on stock engines, they are not tuned nor built for that. Your engine, on the other hand, was. Hence forth the difference.