Looks a nice unit, apart from the price. One thing I did pick up on from their website, and now that people are stating to see the merits of Lambda, is they say on that PLX site that it doesn't need calibrating... BUT, the gauge measures AFR, and if it doesn't need calibrating how the hell can it display the right AFR if it doesn't know the stoich value for the fuel?

Let me be quite clear - 14.7:1 for gasoline is approximate, and varied with blend, Octane, region, yada-yada-yada.

Anyway - not meaning to hijack the thread but this topic is being discussed!

Cheers,
Hymee.

PS - I'm thinking about a range of Hymee Enhanced (R) Guages to compliment the sCANalyser suite.

 

All gauges that require calibration, do so in free air. They don't care about the stoichiometry of the fuel.
Gauges that don't require calibration have a heater control circuit that doesn't have a switched component.

 

hey Jeff...what happened to your post count?

 

that is not jeff, that is his nice well behaved twin.... i think his nickname is mutt.

evil jeff is in timeout.

if you add mazda to the front of your screen name you are the evil one!

beers

 

I think I am going with "Lil' Maniac"
https://www.rx8club.com/lounge-4/new-rule-lil-143712/

 

i am thinking lil mutt!!!

btw, check pm..

beers

 

so Juan,

its always on, yet there is a switch to turn it on or off? Im not sure I get that? Or is it that there is an on off switch, but you just leave it on always?

Also you just use windscreen washer fluid bottle? so you can no longer wash windscreen, or it just uses same mix?

As for the snow controller, I take it you don't need to constantly adjust things, (unless say you are at a track day and want more meth spraying more constantly?)

Cheers

 

Jeff,

Glad to know that week at rehab worked out for you, congratulations.

However, like Britney and Lohan after rehab, it equates to lackluster personality.

Can’t wait for them and you to fall of the wagon.

 

Don’t need to apologize. Everyone is welcome in this thread. The owners, the wanna be, the I want one but no money, the I hate this SC, the I don’t own an RX8 but I’ll post my two cents comments, the good critics, the bad critics, the smart people, the people (like me) that only know 1% of what we are doing.

 

Exactly

 

Wow, major bling factor for sure. OLEDs, switchable outputs. Have to think about that; makes the decision on which gauges to fit into a 3 gauge pod more flixible. Thanks, Jeff.

 

Hymee, I need some education here: AFR vs. Lamda?

 

Spy shots off the prototype Mazda RX11 in its testing faze

http://www.youtube.com/watch?v=tvCzSqEz5Gs

 

Nice balance for that 1/8 scale--see how the front in went down when you let off the gas? Glad there was grass on the other side!
Those things are a lot of fun
od

 

I was just commenting on the fact that the said gauge displays AFR, so it does need to know the stoich value, as it is a lambda meter in the first instance, and to display AFR it does a simple multiplication to get AFR.

Wideband O2 sensors and their associated control circuitry measure Lambda. For ANY fuel, the ideal air:fuel ratio results in a Lambda value of 1.0

A depletion of Oxygen in the exhaust (i.e. too rich) lowers the Lambda value (less than 1.0).

An excess of oxygen (i.e. unburned O2 = too lean) gives a lambda value greater than 1.0.

To determine the AFR once you know the Lambda, you multiply Lambda by the stoich value for the fuel being used. The problem is you don't exactly know what that value is, as it depends - it is specific to the actual blend being burned at the time.

Therefore if you are tuning to obtain an AFR of, say 14.7:1 for example, using a meter displaying AFR, the accuracy of the reading depends on the accuracy of the AFR constant built into the guage. If the fuel was stoich at 14.67:1, and you were being very parfticular on getting 14.7, but the gauge was "calibrated" at 14.1, then the reading is BS anyway, so you are wasting your time. Yes - you will be close. The same argument applied if you are tuning for max power AFR.

However, if you use lambda, the target lambda you are tuning for doesn't change with the fuel blend. 1.0 is "ideal" for any fuel. Gasoline, Diesel, Methanol, Avgas, NitroMethane, Gasoline with pre-mix, Ethanol...

Lambda is independant of fuel. It is what the computer inside the car is using. AFR is a computed number based on an assumed stoich value for the fuel.

I hope that helps.

Cheers,
Hymee.

 

Question:

What would be the consequences of running an A/F ratio of 16.09 while at WOT and 7700+ RPM?

 

if you did that, then you should be the one telling us what happened

you might get detonation, but that would depend on your fuel and charge temps

 

pretty simple...boom

 

With a bunch of meth injection you might be ok; I give it a 60/40 shot of detonation with meth.

 

kaboom????

 

Under normal circumstances:

 

Actually, you would be surprised.
In a N/A application, you would just lose power.
In an FI application, you may simply lean-misfire.
Detonation would depend on whether there was a sudden temperature rise.
I actually had some 15:1 moments at 7 PSI or so on the highway in 5th gear the other day (I think I'm losing my fuel pump ballast resistor).

It just misfired, but no detonation.

 

Answer:

I was messing around trying to develop a CAI along with my RB Ram Air duct. Come to find out that the air G/S ratio dropped and my A/F ratio went sky high. On the other hand, glad I’m running meth as a failsafe system.

See attached A/F readings with Ram CAI and after removing the CAI.

 

eep!

 

hymee: I am now a disciple of Lambda. Thanks!