I know i might get flamed for this question but here it goes...

I have a af ratio recorder. It maps out the A/F per rpm. Would it be possible to tune a AFC with this, or do I need a dyno?

 

as long as its a Wideband A/F datalogger you can do it.


Todd

 

It has been over 2 years and this thread is still going

 

When you think about things that make real power (like jet engines, hydroelectric dams, nuclear power plants) and the like, our motor is a pretty simple system. Tune away! Have lots of fun...

Just don't play in unfamiliar turf. But there are lots of books on tuning, and lots of web resources too. And lots of things that you can use to see if you're heading into dangerous ground....

If you want to tune yourself, you should understand some or all of the following...

How internal combustion motors work.....
What A/F ratio is and what it means to blowing up your motor!
How to interpret exhaust gas temps and what they meant to blowing up your motor!
Knock, detonation and pinging, and what to do to avoid them.
How to log data and use diagnostics.
How to change settings on you engine managment system.

With all this and some nerve, you can go ahead and tune away! Remember though, ultimate tune for power is running on the hairy edge of very bad things, so GO SLOW, and leave a safety margin.

Now's the time for famous last words....

What's the worst that can happen?

Matt

 

In the display there is a reading for correction. In my case when adding fuel I don't see a change under power to this item but when I lean the mixture out it begins to show the amount of correction. Shouldn't it show both ways? What do the correction numbers mean?

I'm also putting in larger injectors, 380cc this weekend, should the AFC be enough of a fuel management device or will I need additional software?

Thanks

Bob

 

it should show both ways, mine does.... i haven't given it more fuel, however, considering i have 440cc injectors in and i have to bring those things way lean as they are way too much for the car just yet....

the display is in percentage correction, it should say that in the manual.... thus if you have a stoich. condition, and want to add fuel, increasing the percentage of additional fuel capable would cause the injectors to output that much more fuel into the system

as long as you have the newer model AFC's (S-AFC II or AFC Select), if it can control my 440cc injectors, i think the 380's won't be a problem

 

It is the newer model. My car according to a couple of tuners is the only MCS that has ever needed fuel added to it. I'm now looking for a way to plug a sensor into the car to verify the readings. In the meantime all the high throttle is set to zero and I've begun leaning out the low throttle, just a little. The butt dyno says I'm going the right direction.

 

Is there a chart anyone did on where you should start off with the setting and other settings with different mods????

Whats the going price on the safc-II and from where?

 

A local shop can get me a SAFC-II next day air for $360.....is that good and should i even bother getting it. Ill be running a 19% with a intake,ignition, and exh?

 

Seems like a decent price but where and who are you going to get to install and tune it? It's about 1.5 hours install and I would think at least 1 hour to tune assuming no problems. I would also suggest that you have an 02 bung installed so that you are sure you are getting good A/F numbers.

 

Hopupracing.com has select unit sale price $309 with free shipping. Check it out.

http://www.hopupracing.com/fuelmanagement.html

 

Thanx for the site and saving me $51 .......

Intalling it isnt the problem and tuning is nothing being i use a local dyno shop in my area.....I just wanna know if this is even needed and worht doing with the setup im running.....?

 

I would think yes, at least I'm using it. Our cars I'm told run rich to begin with. Running the 19% is going to lean it out somewhat but whether it leans it too much or not is the question. The Dyno will answer that question. I use the AFC to make the changes I need..

 

West Coast rice....is nice . Always friendlier to the pocket book. My first lesson of owning a BMW label car . Enjoy!

 

Is there a thread about the rough number you should set these things at to start off with different mods?

 

not sure where you're getting this information from... ALL cars run a little rich from the factory to prevent against running lean and causing engine failure.... the MCS runs stock 80% duty cycle on stock pully - using a 19% pulley will make that number approach 100% (max duty ANY injector should ever run is 85%, btw) so you might want to check into your logic once more

no, and for good reason.... you said tuning shouldn't be a problem, and by all means, please have your AFC tuned! no one is going to "donate" their dyno charts and AFR's because it cost them money and they would be giving it to you for free.... which leads me to the next point that all MCS's are different - what works for one car WILL NOT work for all the rest as far as A/F tuning

have your unit dyno tuned since it isn't a big deal to you instead of trying to get "rough numbers" and potentially cause problems

 

No, what i meant was.........Is there a setting i should start with before i do what i have to do to tune it on the dyno...........Im not gonna put this in with no parameters and drive the car.

Nice attitude also guy........See around here.......we give w/e info we have to anyone that asks for it.

 

not one thing i said was out of line or unwarranted.... you state that you can throw you car on the dyno like its no big deal - my company is purchasing a $93K top of the line AWD Mustang dyno in December, thanks - then it sounds like you were asking if there was "free numbers" to put in without having your unit tuned, and no one will give you that for the two reasons aforementioned

there are no "initial settings" before putting in on the dyno.... next time i fire up my car as it is halfway torn apart right now with the battery disconnected, i will find out the correct sensor values for proper tuning - which does not affect driveability.... upon initializing the unit, the manual walks you through the configuration (# of cylinders, throttle position sensing, etc), but other than that, there are no settings that you SHOULD set before seeing dyno time

"see around here," as i have been here for the past two years and you for the past 2 weeks, people give away as much information as POSSIBLE for them to give away - but wait, is that why people are paying money for the dyno time and thus the dyno charts to see what the M7 AGS system is really doing?

 

:edit:.....Im not gonna even argue about this at all.....Last Big mouth started a debate with me got the thread locked down so IM gonna shut up.

Wow....Theres some touchy people on this site.

 

1FSTMINI if you would like my settings for the SAFC, I will gladly give them to you, but I have to wait until my MINI is running again. and the battery connect. Some Stoopid reasons to hide some AFR's and settings for what percentage of throttle. One of the reasons i believe I blew my piston is because some people do not feel they can share anything. If we all could get along and help everyone out a bit, the world would be a better place. Obviously some people are greedyand self absorbed. Not pointing any fingers or calling anyone specific names. Just a General Observation.

 

TY

 

D00d, did you ever isolate a cause on the failure? Was there any timing advance or leaning out? Hopefully it'll now be fixed !

 

Wait a sec.

Dont be giving me a setting that popped your motor.

 

LMAO, trust me, you won't do the same as me, I have 440cc Injectors. After a long investigation, we (the investigators) have come to the conclusion that it was a random part failure. Had the injectors flow rated and they are all the same. Piston had detonated once and the knock sensor didn't detect it in time and therefore you have a nice hot internal combustion in that one cylinder wall.

 

Sooo.... old posts I know but has anyone come up with a ECU pinout? The one earlier in the post, if it is correct, has everything I need except vehicle speed and injector signals to hook up my boost controller (twincharged mini). Anything anyone has (including the 3 page thing, I'm an electronics technician :D ) would be most appreciated.

NFCooper