Pros on MS w/ na BP

[worldhazard]

So i'm looking at this as a mod that can be done now, and modified down the line as the setup progress'.

Would a MS unit be beneficial on a naturally aspirated BP with say only mods of being a custom intake, b-code, and maybe say ex/in cam mod.

And how difficult would it be to tune it after going from the above setup to a forced induction setup?

What kinda of knowledge would one need to be able to properly tune w/ MS.

And a side note for Lex I guess, if the unit were to come from you... The maps.. would they be previously installed, so i could just follow the PNP directions, and drive away?

these recently popped in my head, as my plans are evolving

[Mazda_Powered]

well, the main bonus of the MS is to delete the VAF and to control your timing/fuel maps at the push of a button. So i'd recommend deleting the VAF and free up some restriction.

Also the conversion will make its $$ back to you from the gas money you'll save...some of these 250whp + ppl are getting better mileage than most of the stock BP guys lol.

Maps would be limited i think for n/a, so the car should start, but you'd need futher tuning to have the car running with your setup.

[wheresthericego]

well, the main bonus of the MS is to delete the VAF and to control your timing/fuel maps at the push of a button. So i'd recommend deleting the VAF and free up some restriction.

Also the conversion will make its $$ back to you from the gas money you'll save...some of these 250whp + ppl are getting better mileage than most of the stock BP guys lol.

Maps would be limited i think for n/a, so the car should start, but you'd need futher tuning to have the car running with your setup.

i'm making 255whp
I get ~21 MPG if I am hella easy on the gas and only highway driving.

[therieldeal]

i get 25mpg with mixed around town and highway driving. sounds like you're tuned a little too rich

you should be able to snag an N/A base map from someone with a miata...

[worldhazard]

and this is where a wideband O2 sensor come necessary too right? i have an a/f gauge.. but it's not what i would need right? would that be 'narrowband'?

[silverton]

To fully understand why a high performance vehicle tuner would be better off using a wide-band O2 sensor/gauge versus a narrow band setup, we must first understand what each sensor was originally developed to do.


Narrow Band O2 Sensors began to appear on vehicles with the advent of fuel injection in the 1980’s. Their purpose was to monitor component degradation (i.e. fuel injectors, vacuum leaks) of vehicles as they accumulated miles. Their basic job was to let the computer know whether the vehicle was running at an air/fuel ratio of 14.7:1 under idle (ideal ratio for gasoline engines), moderate acceleration, and cruise conditions, and if it wasn’t, to “trim” the injector pulse-width to either slightly lean or richen the engine. When the computer is paying attention to the input from the O2 sensor, the engine is operating in a “closed-loop” capacity. Under heavier acceleration or wide-open throttle the computer ignores the O2 sensor because it requires an air/fuel ratio other than 14.7:1, which is outside the design parameters of the sensor. This is known as “open-loop” operation. The sensor lets the computer know if the engine is running above or below 14.7:1 by sending voltage to the computer in a range between 0 and 1 volt, usually sweeping between the two extremes of this scale. Traditional narrow-band air/fuel ratio gauges are simply a voltmeter for this signal. This can be seen by the repeated sweeping back and forth of the gauge in most idle, light throttle, and cruise conditions. To summarize, a narrow band O2 sensor is only able to tell a computer (or gauge, for that matter) whether an engine is operating above or below a 14.7:1 air/fuel ratio.


Wide Band O2 Sensors where developed in the early ‘90s as vehicle manufacturers began looking to obtain air/fuel ratio information under all circumstances. This ranged from WOT to varying ratios, for example running air/fuel ratios leaner than 14.7:1 under cruise conditions. Volkswagen and Honda pioneered the development of the wide-band O2 sensors to provide accurate air-fuel ratios under these varying circumstances. They did this by broadening the voltage range in which feedback from the sensor was provided and making a linear scale that provided a fixed voltage that correlated to a specific air/fuel ratio. While the narrow-band O2 is still the most common type of O2 sensor installed on most new vehicles (for cost reasons), OEMs will still use wide-bands on many forced induction applications (or, in Honda’s case, on their “lean-burn” Civics).


High performance vehicle tuners discovered that wide-band O2 sensors are very helpful when accurate air/fuel ratio readings are required to maximize power, reliability, and mileage on modified vehicles.

You would want a wideband.

[BlackMazdaMx-3]

I would say you would see a gain with megasquirt and tuneing to run higher octane fuel.

It would not be hard to switch to a turboed setup if already tuned on an na setup, just have to readjust timeing map and set the ve table set points higher to be able to tune for boost.

tuneing megasquirt is really simple just need a wideband, a computer with a seriel port, and open road, it is really easy to get the hang of. just adjust the ve values untill you can hit every value on the 12X12 table and the afr is good just takes time. The hardest part is startup especially cold.


Im running e85 and getting 21mpg and have 300whp, my daily had 60hp on a b6 and only gots 30mpg. now its getting a bp because i just blew the b6 up.

[Lex]

To address the question for me, yes maps come pre-installed on the units but in order to take the most advantage of the MS it's best to fine tune it for your motor and application.