It's a billet pump specifically designed to run at high speed. The fastest I could spin it was 7100 rpm's but my target is 8000 rpm's. I have changed gears so 8000 rpm's will happen next time.
This is my point - you may actually be spinning the water pump too fast for an LSR application.
By slowing the flow down, you may actually be able to pull more heat out of the engine.
If the coolant is moving too fast through the block and radiator, you may not be able to effectively release the heat through the radiator, which allows warmer water into the engine and the temp creeps up.
We wound using pulleys which slowed our water pump down to about 60% of what the stock pump was turning, and and I don't think we hit 200 degrees.
Chris is right. Not all but most automotive water pumps are designed turn ~4,500 rpm max. My water pump is a racing pump but I run it at 60% of crank speed. YMMV
Paul,
Some things to consider:
A/ Oil temp in the pan is fine. Wet Sump? Oil manufacturer can suggest the "optimum" temp range for their product. Sustained operation @ very elevated temps is going to require use of a synthetic based lubricant to retain film strength at those high temps. Loss of lubricant film or lubricant "breakdown" will kill your bottom end in short order with a turbo. Depending on high temp film strength, very hot oil
might gain extra bhp. I typically use 220/235 degrees F.
2/ Some sort of "restrictor" should be installed in the engine coolant (water) outlet. This will raise the pressure in the coolant passages and can prevent localized "boiling", common with a "free flow" system. Run as high a pressure cap as you can, as this also adds protection.
d/ Keeping coolant temp low, within reason, can allow extra boost or timing, thereby improving bhp output. Realize that this is a "balancing act". Your goal should be to have a temp under 212 F (less would be better) at the end of your run.
z/ Billet pump for high speed?!?*? NO SUCH ANIMAL. Check out the pump drives on Cup engines . . . notice that the pumps run @ approx 50% crank speed. That's not a happy accident. Engineer your setup for 4000/4500 pump shaft rpm max. There are numerous pulley ratios available for v-belts, poly v-belts, and gilmer drives. Do some research.
Fordboy