Infrared pyrometer for checking AFRs!!!!! FUUU YAHHH
#1
Elite Member
Thread Starter
iTrader: (2)
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,682
Total Cats: 130
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Wooo! I thought of a great way to check if you are hitting the same air/fuel ration in all cylinders!
Instead of having individual cylinder widebands or EGT sensors-
Do a big hard throbbing swollen pulsating quivering dyno pull (or hill or brake'd pull) and then use a pyrometer to check the temperatures of your exhaust manifold runners. If you have one cylinder that is hotter then it is either getting more air or less fuel. If you have matched injectors, then hot=more air.
I will be doing this **** when I dyno tune so I can make sure my modified intake manifold is not ******* up my air-cylinder distributions. I think this test is so damn easy it's worth it on any setup including stockolio.
What do you all think? I think I deserve the super prize. **** flow bench testing!
Instead of having individual cylinder widebands or EGT sensors-
Do a big hard throbbing swollen pulsating quivering dyno pull (or hill or brake'd pull) and then use a pyrometer to check the temperatures of your exhaust manifold runners. If you have one cylinder that is hotter then it is either getting more air or less fuel. If you have matched injectors, then hot=more air.
I will be doing this **** when I dyno tune so I can make sure my modified intake manifold is not ******* up my air-cylinder distributions. I think this test is so damn easy it's worth it on any setup including stockolio.
What do you all think? I think I deserve the super prize. **** flow bench testing!
#6
Elite Member
Thread Starter
iTrader: (2)
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,682
Total Cats: 130
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
some of us are not that old ![Stick Out Tongue](https://www.miataturbo.net/images/smilies/tongue.gif)
bah! I have read so many threads with "but i would have to run widebands on each cylinder to know" or "i need individual cylinder EGT sensors". This fine skill has been long forgotten.
![Stick Out Tongue](https://www.miataturbo.net/images/smilies/tongue.gif)
bah! I have read so many threads with "but i would have to run widebands on each cylinder to know" or "i need individual cylinder EGT sensors". This fine skill has been long forgotten.
#18
Supporting Vendor
![](/mt2011/images_td/ranks/vendor.png)
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (33)
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,659
Total Cats: 134
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
There are going to be minor differences in temperature cylinder to cylinder, but also a lot of error is introduced measuring in this manner. We have a non contact thermometer at the dyno for this purpose, however if tuning a real monster of a car, we'll stop a couple of times to pull and check the plugs.
The non contact thermometer is more trustworthy for verifying sensor calibrations, looking for / identifying a dead cylinder... and for tuning our RC nitro cars.
The non contact thermometer is more trustworthy for verifying sensor calibrations, looking for / identifying a dead cylinder... and for tuning our RC nitro cars.
![wink](https://www.miataturbo.net/images/smilies/wink.gif)
#19
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
So you're going to measure the runner temp at every RPM for each cylinder to determine exactly where you're running lean?
How about if you're running way lean in cylinder 3 at 3-5k RPM at 25 psi and when you taper down to 20 psi from 5-7.5k you're running pig rich? What will your rectal thermometer show?
How about if you're running way lean in cylinder 3 at 3-5k RPM at 25 psi and when you taper down to 20 psi from 5-7.5k you're running pig rich? What will your rectal thermometer show?