correct value for warm CHT reading (ohms) Options

[brant]

so my CHT reading was 76 ohms - hot (at 180F oil temp)
I'm reading 2 different things.. on the Brad anders site


one saying that a warm reading should be below 100 ohms
but then the table shows this: for 210F

Sensor Temp = 39 deg. F Temp = 61 deg. F Temp = 210 deg F

0 280 130 003 6.10 K ohms 2.94 K ohms 199.3 ohms
0 280 130 012 NA 2.85 K ohms 191.2 ohms
0 280 130 017 3.63 K ohms 1.74 K ohms 124.7 ohms



I'd love some input from Djet folks about what numbers you see on a warm motor?

brant

[brant]

New Bosch sensor
New calibration

Fine at idle
Mid to High 12’s from 3k to 5900 rpm

A bit lean. But not much..? At light throttle... highway cruising 80-90mph steady for multiple miles
13.7 to low 14.0. It starts out better but steadily climbs over a mile or two...to that number

I’ll have to research more
What is your goal for steady light throttle?

Oh. And my head temp gauge is now working for no apparent reason
I took the thermo ring out last night for visual inspection. Now it works

[JamesM]

WOT numbers sounds pretty good, especially if you are still holding in the 12s under load at 5900RPM

Are you running a stock cam? All my stock cam cars are done making power well before 5900.

When im tuning Megasquirted cars I usually have the AFR targets set mid 12s under load and mid-high 13s cruise, though i have suspected i could probably lean out the cruise area a bit more. I usually try to keep it out of the 14s unless in overrun but with the thin, hot, dry, air in salt lake I try to error a little on the rich side to help the head temps.

If your head temps are good I would say your numbers are fine.


Around here with my 2.0 d-jet cars (that do have temp monitoring) its not uncommon
for me to see 380-390 (depending on the day) at the #3 plug pushing it on the freeway.

My cam'd high compression 2056 Megasquirt car usually runs ~50 deg cooler