If you want to spend a bunch less without much downside and have one that more or less fits in the stock cluster you can get the VDO from egauges.

 

 

Has anybody tried using these vents on an NB hood?

 

Not to my knowledge. I did remove the snap-together plastic mesh grid portion in those vents and then trimmed them to open them up a little bit more for increased airflow

 

Hopefully they will fit cause I went ahead and ordered a pair for my 2000.

They are the best looking solution that I have seen for hood vents.

 

Well I installed a pair of the WRX side vents on my 2000 Miata.
Here is a picture.
They seem to fit an NB as well as an NA.


This subforum is specifically titled "Race Prep" so I cannot comment on the worthiness of the vents for track use.
For the street they appear to do exactly what I am needing.
The temperature gauge has not risen above 200 deg. F. even when driving in stop and go traffic in 95 deg. Summer heat.

 

They look good. I think I like them placed further apart like you have them.

 

I had no choice on the distance apart because my V8 conversion utilizes the Corvette cold air intake which uses the center real estate.
It does look good in conjunction with the placement of the hood latches and the NB headlights.

 

+1 Symmetry is good

Underside shots please?

 

I've read through this whole thread and am still a little confused. Planning on an upgrade to the cooling system on my MSM weekend track car. Removing AC, new radiator, ducting to radiator and reroute (if required). Radiator hasn't been chosen yet, looking at the Supermiata one, but can't work out whether a reroute with the standard head gasket is still a better option than no reroute at all with these models?

Can't change the exterior of the car due to class rules, ie, no bonnet vents.

 

+1 on the proper reroute configuration on the MSM. I still haven't concluded what is the best route, to go as far as a reroute on the MSM. Mostly reading the MSM doesn't need it like normal miatas. But if you install the correct headgasket then you will net the benefits like normal miatas. But I don't know which Headgasket it requires, and at what power level I should plan to do so. 108k and healthy, about to be in the 260whp range as a weekend canyon carver. TSE Radiator and no AC.

Also I plan to add the Carbontrix CF Kidney Vents which are the same size as the WRX vents above.

 

I don't have any MSM answers, but I do have a thought or two about N/A NB2s on track in Texas summers.

After installing the Koyo Hyper-V radiator (with 3 sides of pipe foam (see my build thread)) and a 180F thermostat, I later installed a coolant re-route, and I was eager to see the difference in water temp at the back of the head, where the "crunchy" cylinder 4 lies. To my amazement, my water temp was only 2F lower back there after the re-route. So, I returned the car to the stock coolant routing. To be clear, on a 95F day, my water temp reaches 208F after 30 minutes on track with no re-route. No need to add the weight and potential leakage.

Additional information: my car makes 118WHP (yeah, I know) and has a redline of 7500RPM, and I consider the redline to be an old friend that I visit often on track. Very often. I also still have A/C.

.

 

Uhhhh.....where do you think that water coming out of the back of the head is coming from? It's water that's flowed over all 4 cylinders and mixed so you're not going to see a difference in the peak temps. The idea of the coolant reroute isnt to improve total cooling capacity but to more evenly cool each cyl so you don't end up with cyl 4 detonating away before the rest of them. I've seen way too many toastes cyl 4 pistons to not reroute. Mazda saw the issue as well which is why they changed the head gasket design.

 

You missed the part where I said NB2?

 

Gues I did, but what were you expecting by running a reroute either way? We're you going to see lower temps?

 

 

This is what I was thinking as the MSM head is non VVT, which means it uses the standard NB1 head gasket right?

Would be good for one of those guys to confirm.

 

Reroute regardless of head & gasket combo. If you are going to quote me, ask me first

I have posted this many times in the past but all of the conjecture and fear about the head gasket is based on speculation. No one has actually done any testing to show any problem regardless of combination. But we have tested both head gaskets on both heads and many different configurations in competition with success. It is a non-issue.

So it is clear, f your car is overheating , install a reroute regardless of what head gasket you have.

If you are already taking the head off for other reasons then go ahead and use an NB1 gasket head as it has more total flow area. Average velocity of the coolant should be made as high as possible.

 

Thanks Emilio

 

Assuming good ducting, at what vehicle speed do you turn off radiator fans (when do the fans become useless burdens)?