OEM Hood v Seibon TS Testing

fuct

maybe since theres no air moving thru the radiator then the water/antifreeze in it is just soaking up the heat from the radiators metal..... maybe?

theDreamer

That is what I am assuming is happening, my hope is with an open hood design we see the ambient temps are able to drop around the engine allow some air flow even while the car is sitting.
This will allow hotter air to get away from the car and bring fresh/cooler air to the radiator keeping temps down without creating heat soak.

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Sh0velMan

The coolant temp sensor isn't in the radiator.

More than likely, it's the block heating the water while it sits.

Matt, when you let it sit like that, try this:

1) Start engine, let it idle for 10 seconds or so (assuming oil is hot)
2) Note water temp
3) Rev the engine freely to 4K 3 or 4 times.
4) Note water temp

You should see a sharp drop in the reported water temp after just revving it a few times (spinning up the water pump).

Seems to me that in the VQ platform (or at least, the HR and VHR versions) they learned their lessons from the older engines (RB, VG and SR) and made the water pump a low-flow per RPM design with only 5 or 6 vanes on the wheel. This means you have to put some revs on the engine to get the water to circulate fast enough to see an accurate water temp, but also means it doesn't cavitate at high RPM.

For example of the design differences I mean:

OEM RB water pump:

N1 RB water pump:


I know this is a bit off topic, but it's something I've done some research in to literally in the last two weeks, so I thought I'd share.

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