I was logging VVE today and had done a few hard accelerations in 3rd for just a few seconds before I would let out. The 2nd time I did it and then was decelerating when I noticed my temp gauge was near 240. I had never seen it get anywhere near this, or not enough to catch my eye like that. The temp came back down pretty quick while cruising. I looked through the log and found it would go from 203 to 241 within 15 seconds when pushing it like this...
I then looked through my logs from the past couple months when it was cooler out and noticed the engine had been running 196 and would spike to maybe 210 on hard accel. A log from a few days ago going down the highway I noticed ETC's around 205 and spike to 215.
I do not notice any coolant loss, engine performance issues, or moisture in the oil. The coolant system pressure feels pretty normal on the hose. The hoses are factory and in good shape. The radiator active grill shutters are not stuck closed.
After checking all this out I took it down the road again with the heater on high to see if I felt the air coming from the vent cool off from lack of flow or anything at WOT in 3rd for 2-3sec. The heater actually felt to get a little hotter at WOT, but this time the gauge did not move much. I tried this twice with the same result. I then turned off the heater and tried which got the gauge to raise up to 3/4 position or so.
This has me guessing either the active grill shutters are limiting air flow to the radiator too much, or that maybe the lower radiator hose is collapsing? I would think a shutter issue would not show so much temp rise in just 15sec though.
VVE tuning drive highway town.hpl
vve idle tweak two.hpt