Electric Water Pumps (EWP)

[NitroDann]

low 80's is the perfect temp for horsepower. Somehow this is pretty universal among 4 stroke engines.

Dann

[madjak]

Im not sure what actually happens if the coolant is too cold. As long as the oil temp is in range I can't think of any major dramas with running the head cooler except for stress due to the thermal expansion of the block.

[madjak]

Well the EWP worked flawlessly all weekend. Coolant sat in between 80 - 85 regardless of how hard I was pushing even with some sessions at the limit for every lap. For reference that means I had the engine on full song for 90% of the lap with revs sitting between 6500 and 8500. On my EWP map that's not even running more than 60% so there is more buffer there too.

What I like the best is pulling into the pits, and by the time I take all my race gear off, steering wheel and jump out, I can pop open the bonnet and touch the radiator and head without instantly burning myself. Before the engine would bake and you could hear stuff creaking in the bay whilst it sat there... now it's almost like it's been sitting there for 30 minutes. If I'm quicker the EWP and fan are still running but most times it's already off which means the coolant and head temp are below 60 degrees within 45-60 seconds of turning off the engine. It also means there is no build up in engine bay temp over the day which was a bit of an issue pre EWP.

On idle the temp rises rapidly, with the EWP at 20% and no fan. I usually get the coolant up to 70 degrees before going out on the warm up lap. It's more important on the hillclimb / sprints where you need to get to temp before hitting the run.

All up I'm extremely happy, and I honestly think the engine is reving quicker north of 7000 rpm... I'm having to push through the gears a bit quicker than I remember, but there might be a bias factor there.