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Old 11-25-2014, 08:08 PM   #961
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Dumb question: Why is the O2 sensor mounted there?

Ease of access to disconnect it after tuning is complete? - obviously will not last long mounted in that position.

Also, needs custom intake manifold (just wish Plazmaman would make one of these for the MX5:
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Old 11-25-2014, 09:21 PM   #962
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Hypertune will but it costs around 2500 dollars.
I will eventually build an IM but not yet.

The o2 is supposed to be there for only tuning but the turbo manifold has very long runners and it doesnt seem to bother it. Been left in a few events and no issues.

Dann
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Old 11-26-2014, 02:49 AM   #963
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Mine is also there and was going to prompt the question as well...so far it seems to be fine after about 2 years and 10 race days/track days and plenty of about town driving...

Hopefully that comment didn't just engage murphy and his f'ed up laws...
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Old 11-26-2014, 09:04 AM   #964
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Quote:
Originally Posted by Lokiel View Post
Dumb question: Why is the O2 sensor mounted there?
in AUS, fire actually burns cold so the sensor isn't going to be harmed that close to the turbine.
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Old 11-26-2014, 09:38 AM   #965
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Turbos also spin backwards there too.
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Old 11-26-2014, 11:28 AM   #966
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Quote:
Originally Posted by nitrodann View Post
Crank has had the counterweights off and is knife edged and fully polished.
pics? id really like to see how that was done.
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Old 11-26-2014, 12:45 PM   #967
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Quote:
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Turbos also spin backwards there too.
I've heard that.


The stock 1.6 intake is a restriction above a certain point. I don't recall what it is.
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Old 11-26-2014, 12:53 PM   #968
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I've been running a sensor about that close for 5 years now. Same sensor. Still going strong. Not an issue.
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Old 11-26-2014, 12:53 PM   #969
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Nice work. It will be interesting to see a spud maxed out on e85. Hopefully with a proper dyno this tiem.
We got to 360 on stock IM and TB on ryans car, but the torque was starting to dip pretty hard up top, like 50ft/lb from peak to readline
That is probably close to the limit.
I really think your friend or customer or whatever should look into getting an NB head and proper IM
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Old 11-26-2014, 01:00 PM   #970
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Quote:
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I really think your friend or customer or whatever should look into getting an NB head and proper IM
1.6
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Old 11-26-2014, 01:05 PM   #971
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correct, and in japanland (and likely other places) they have nb heads for 1.6
he's in AU so he can probably source them easy
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Old 11-26-2014, 01:06 PM   #972
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Did they continue to develop them as well? Very interesting.
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Old 11-26-2014, 01:13 PM   #973
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In Europe too, very common
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Old 11-26-2014, 01:36 PM   #974
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Quote:
Originally Posted by sixshooter View Post
Did they continue to develop them as well? Very interesting.
I don't know for sure, bit I don't think the intake ports are different between the NA/NB B6.
Just solid lifters, NB sensors and different cams (I think).
If the IM fits, there is no port difference to worry about. Same IM gasket?

Edit: Just checked Jenvey fitment for B6, same for NA and NB, so same port angle. Most probably the same casting of everything. Injector location is another thing that can be different (nice to not have experience some times).

Last edited by NiklasFalk; 11-26-2014 at 02:12 PM.
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Old 11-26-2014, 02:11 PM   #975
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Can anyone elaborate on this above.....

a head that came with solid lifters is a plus for me....but worried about cams and sensor compatibility issues...
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Old 11-26-2014, 02:19 PM   #976
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Quote:
Originally Posted by mx5-kiwi View Post
Can anyone elaborate on this above.....

a head that came with solid lifters is a plus for me....but worried about cams and sensor compatibility issues...
you can swap lifters if you like. A cam ground for HLA will pound solid lifters since there are no "lash closing ramps". But the other way around is no problem (but not optimal).

Running NB sensors have it's advantages, and you have to search to see if anyone have been able to use a B6 NA CAS on a B6 NB head/cam.

There are performance cams available anyway...
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Old 11-26-2014, 02:24 PM   #977
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Wow, so they just re-cast the na heads with solid lifters and nb sensors and called it a day?

That's terrible.
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Old 11-26-2014, 02:36 PM   #978
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Did the same thing with the KL. It's not uncommon. Even outside of Mazda.
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Old 11-26-2014, 02:39 PM   #979
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Quote:
Originally Posted by 18psi View Post
Wow, so they just re-cast the na heads with solid lifters and nb sensors and called it a day?

That's terrible.
It's a low cost 110bhp version aimed to reduce the taxes, why spend money?
Using the NB sensors is most probably a lot cheaper than NA (AFM+CAS).
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Old 11-26-2014, 05:26 PM   #980
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Quote:
Originally Posted by 18psi View Post
Wow, so they just re-cast the na heads with solid lifters and nb sensors and called it a day?

That's terrible.
The manifold is different for the NB6 though. The Z series motors were the evolution of the B6 that we know of, IIRC someone on here was putting one of the Z heads on a B block and it fit, ports look even better then 99+ 1.8s.
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