Nice job Regan !...and you drive it well ! Its always a pleasure to share the track with you and I look forward to many more times out there with you.
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Geez, has it been that long already, LOL. How time fly's.
As Regan has said, he approached me and asked if I would be interested to start the testing on the new MASIV design when it was first thought of because of the higher RWHP numbers and hard racing I put my NSX through 12+ weekend events a year. Having known Regan on and off track and knowing how dedicated he is to the NSX community, I trusted him with this adventure so I made the commitment to him to see it all the way through from beginning to end, good or bad.
The journey took some patience, a lot of trial and error and some nail biting, but in the end was worth all the challenges we faced getting through it. I personally tested 3 of them before we finally arrived at the newest and our final version.
I had been using the Ron Davis for a couple of years prior to the start of testing for the MASIV. I was looking for something better. The Davis continually developed pin hole leaks and after several repairs I started looking at other options. The Davis would run anywhere from 210 to as high as 228 on track depending on the ambient temps. It must be also noted that I run a Laminova oil to water cooler so this adds even more stress on the cooling system. My oil temps would range anywhere from 235 to 265. Not all that great really and many times I would have to slow down and let things cool off. I looked at the PWR but didn't like the idea of oil to water cooling in the radiator itself with such close proximity. Looked at the dual pass radiator but decided after reading many of the reviews it wasn't something I was willing to spend the money on to try so at Regan's request seem like the best option for the long term. It was, and I am proud and honored to have been involved in this undertaking which has been met with great success that we shared.
As we begun the process with the first version, we found that the new MASIV needed more work as it's cooling efficiency lacked airflow during cool down periods sitting in the paddock so what we surmised the problem as needing stronger fans. Stronger fans were added to the first version and it didn't quite accomplish what we expected although we did see improvements. We were still having issues with long periods on track and some cooling down issues in the paddock. The 2nd generation with redesigned fin pitch and even with the stronger fans we still had issues that we finally related this to airflow after much discussion. (Me harping on Regan 
The next revision which incorporated the fin pitch & spacing and some modification to the tubes and tanks was the touchdown. With the resigned fin density and pitch it performed exactly what we were looking for. We found the sweet spot.
During this lengthy process we have seen a steady drop in temps on my car in coolant and oil temps throughout the process.
First version, water temps at 210 to 228, oil at 235 to 265 depending on ambient temps and 30 minutes sessions on track.
Second version, water temps at 200 to 220, oil at 225 to 255.
Third version (The one now after much conversation and redesign), water temps at 190 to 205, oil at 220 to 245. Ambient temps was 90 degree's
I couldn't be more impressed considering the rwhp I put down, the heat that's generated from running a turbo with this kind of rwhp, 30 minute track sessions of hard pounding on the NSX every lap and considering I run my oil through the coolant as an oil cooler. If it performs this well on my car all things considered, we knew it would perform even better on NA and SC NSX's since they would demand less cooling wise than my NSX demanded.
It has been a very amazing journey with Regan through this and I can't thank Regan enough for trusting me to undertake and be a part of this design with him.
We still have one more test to do. Regan this weekend will be installing his OEM hood back on his car (no ducting) with the single fan layout as the final test. If this goes as we feel it should now, they will be ready for the general NSX owners that want improved efficiency and cooling, whether they track their NSX's or just drive them on the street. I do both
