HenryFrank

Many conflicting ideas on the Internet about this. Should I be placing the probe in #1, #3 or #4 on the manifold?

Miater

In the collector.

If you put it in just one runner, you only get info on that one cylinder.

HenryFrank

I do realize 4 is best. I'm only installing one. I was hoping to get some input on my hottest. I've read 1, 4 and 3. I'm guessing someone has just one installed and can tell me which is hottest in a miata.

Miater

Number four will be the hottest.

Do you have EGR still installed and or working?

Reverant

iTrader: (10)

Why is that?

Miater

Personal experience, lots and lots of threads in many different forums discussing the topic. The Miata coolant route issue, intake manifold design, less fuel(single feed rail) on that cylinder.

This has been gone over many times, usually with people standing on one side or the other.

Here is just one thread that covers it pretty well.

Myth "Cylinder #4 EGT is hottest": Busted! - MX-5 Miata Forum

HenryFrank

I'm installing it at the same time as the egt.

Reverant

iTrader: (10)

In that thread, I specifically pointed out that #4 is in fact, NOT the hottest. In my case, #1 is. That may or may not be your case, unless you have direct evidence for it.

So, #4 is not the hottest, unless you can prove it.

Ben

iTrader: (33)

I put mine right in the middle of the collector.

aaronc7

iTrader: (8)

I put mine in the turbine housing, just after the manifold/turbo union. Same idea as collector, I just didn't want to drill and tap into the nice ceramic coated manifold.

Miater

What kind of numbers do you see from that location?

HenryFrank

Very good info, thanks! I'll give someone a dollar for a pic of their probe in #4 on an NA. (insert your joke there)

HenryFrank

Do you have a pic by chance?

psyber_0ptix

iTrader: (4)

I've got mine on #3 a couple inches after the flange.