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I'll get back to testing after I have replaced my thermostat.
Noticed a few days ago it took quite long time to reach the half way of temperature gauge, and engine temperature sensor tells maximum temperature is only 85C.. should go up to 104C if oil hasn't warmed up before that to around 95C.
That doesn't do any good for fuel economy, and won't allow me to see how much I could raise the intake air temperature by raising coolant temperature (about 96-98C while cruising, maybe higher).
I'll check what the afr is while cruising currently, when I swap the catalytic converter headers to catless. I'm not really sure if I can improve my fuel economy with that.. atleast the noise should reduce a lot, because one of the headers is cracked.
But I have an idea why would the very bad flowing catalytic converter headers be better for fuel economy:
They cause back pressure near exhaust port, and improves 'egr effect' so there isn't need for an external egr.
Hoping of course it either won't effect at all or improves fuel economy.. atleast then I have motivation to fabricate 6-2-1 headers, which is possible when I build a jig with the catalytic converter headers.
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