SV reX
MegaDork
12/8/23 9:29 a.m.
An “available and willing bunghole”? You guys are a riot.
That’s a good article. Thank you.
I would encourage people to get a data logging system, so that you are not logging with your eyes. You should be driving.
And even on a dyno, a logging system will show you precisely where the issues are instead of trying to juggle a/f, engine speed, and some load measurement.
I like for the ecu to just do all the work for me and kick into failsafe mode if AFR isn’t in the appropriate window.
alfadriver said:
I would encourage people to get a data logging system, so that you are not logging with your eyes. You should be driving.
And even on a dyno, a logging system will show you precisely where the issues are instead of trying to juggle a/f, engine speed, and some load measurement.
Agreed, an AFR gauge is at best a warm fuzzy, it’s not really useful by itself. AFR data logged along with RPM, manifold pressure, etc is what you need for tuning.
As far as “failsafe” goes, IME widebands are considerably less reliable than things like fuel pumps and injectors. I favor tuning the car with the wideband (on the dyno) and then turning off the automatic provisions so that the computer is using the tuned, known-good fuel map. It can monitor the AFR and turn on a big red warning light if it thinks things are going askew, but it should not silently “fix” the fuel mixture.
In reply to codrus (Forum Supporter) :
It would be really nice if MS had an on board provision for a Bosch sensor. Then I would trust it more.
I take issue with the statement, “the stoichiometric ratio, which is the ideal mixture of air and fuel that, when combustion occurs, results in no leftover fuel or its catalyst (oxygen, in this case).”
It should read : In a perfect combustion event, the stoichiometric ratio, which is the ideal mixture of air and fuel that, when combustion occurs, results in no leftover fuel or its catalyst (oxygen, in this case).
A perfect combustion event is rarely obtainable. Look at a combustion event as a singles mixer with 100 males and 100 females. Let’s say the mixer is 95% successful; leaving 5 males and 5 females unpaired. If you want to see all the females paired, you must introduce more males to the mixer until that happens.
Same idea with fuel/air mixtures. If you want max power, you want to use all the oxygen in the cylinder (leaving unburned fuel). If you want economy, you want to burn all the fuel (leaving unused oxygen). Richer than max power mixtures provide cooling; working to prevent excess heat, detonation and/or preignition.
SV reX said:
An “available and willing bunghole”? You guys are a riot.
I hit that phrase and immediately thought “JG, right?” Skimmed back up to the top and confirmed.
JG, you are hilarious. I like reading about cars, more if it’s engaging, and awesome if it’s funny to boot.
I never had a turbo car so have no idea whats available ,
But is there an idiot light switch to mount on the manifold that goes on when you have more boost than the switch is calibrated for ?
In reply to californiamilleghia :
The one labeled “Manifold Pressure” mounted next to the NOOOZ light, right?