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Hate to tell you this but my first guess is that if you put the stock thermostat back in or put the mugen one in your problem may go away.
I made a similiar mistake, one of the tricks we always did on our race motors was to cut out the thermostat mechanism so it was open, but the key there was not to remove the entire thing because the water would flow too fast through the radiator and would not cool. I cut my stock thermo but it didnt work on the NSX at track speeds, tuning it/ driving on the street it would never even get up to operating temps, but as soon as I went to the track the gauge was pegged after 3 laps.
The NSX seems to need a thermostat, if you look at it it actually has 2 different plungers. I have not yet had a chance to r+d the modifications needed so that I can remove the thermostat, soon. :smile:
I will also say that I also have a head gasket problem(blown- pressurizing the coolant system) but I am fairly confident that once I fix the engine, I will no longer have cooling issues.

<blockquote data-quote="Edgemts" data-source="post: 462267" data-attributes="member: 6742">Hate to tell you this but my first guess is that if you put the stock thermostat back in or put the mugen one in your problem may go away.I made a similiar mistake, one of the tricks we always did on our race motors was to cut out the thermostat mechanism so it was open, but the key there was not to remove the entire thing because the water would flow too fast through the radiator and would not cool. I cut my stock thermo but it didnt work on the NSX at track speeds, tuning it/ driving on the street it would never even get up to operating temps, but as soon as I went to the track the gauge was pegged after 3 laps.The NSX seems to need a thermostat, if you look at it it actually has 2 different plungers. I have not yet had a chance to r+d the modifications needed so that I can remove the thermostat, soon. :smile:I will also say that I also have a head gasket problem(blown- pressurizing the coolant system) but I am fairly confident that once I fix the engine, I will no longer have cooling issues.</blockquote>

[QUOTE="Edgemts, post: 462267, member: 6742"] Hate to tell you this but my first guess is that if you put the stock thermostat back in or put the mugen one in your problem may go away. I made a similiar mistake, one of the tricks we always did on our race motors was to cut out the thermostat mechanism so it was open, but the key there was not to remove the entire thing because the water would flow too fast through the radiator and would not cool. I cut my stock thermo but it didnt work on the NSX at track speeds, tuning it/ driving on the street it would never even get up to operating temps, but as soon as I went to the track the gauge was pegged after 3 laps. The NSX seems to need a thermostat, if you look at it it actually has 2 different plungers. I have not yet had a chance to r+d the modifications needed so that I can remove the thermostat, soon. :smile: I will also say that I also have a head gasket problem(blown- pressurizing the coolant system) but I am fairly confident that once I fix the engine, I will no longer have cooling issues. [/QUOTE]

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