sunny

iTrader: (1)

This is a video made by Ben Strader at EFI-101 showing an engine on a dyno using one rpm and load site in the fuel table. The engine produces the same power an the AF ratios across the rpm range are not too far out. As Ben stated "You can see that when the single cell is used it gets pretty rich in the middle of the RPM band just before VTEC is engaged and then settles out very nicely. I was easily able to get the A/F's flat straight across by offsetting the pulsewidth by simply changing the Target A/F's and allowing them to be mismatched with the actual A/F's"

This is a very good example why the Autronic ECU do not need a lot of cells in the fuel table, like other make ECU. I see many cal files with hundreds of sites and this just makes tuning a long process.

If the engine has stock cams and not supercharged then the values in the fuel table will be almost the same value. This being the case you do not need a lot of sites.

Other make ECU cannot do this as they do not have a target AF and charge temp table, plus their engine model is not as accurate or they do not have one.

http://www.autronic.com/bin/Autronic_1cell.mov

Right click on link and select "save target as..." to download the video.
The file size is 4.5MB (It's in .MOV real-player format)

EDITED BY A MODERATOR



Thanks - Sunny.

PhilM

Great stuff Sunny.

Fookin impressive, thats using the Autotune I take it? Or purely the Target AFR table??

Only thing id be concerned about is the lambda sensors ability to keep up with the engine, if it did run lean or go out of calibration, could be nasty!.

Looks very good though!

Megasquirt has Target AFR tables too now on one of the latest firmware releases....not sure its quiet as comprehensive though!

GARETH T

i dont really understand whats gone on there

how is it better to have a few load/fuel sites?

isnt it just a closed loop control system? the same as a pectel t6 can do?

markk

iTrader: (2)

Me neither



so all theyve done is run the car up under full closed loop on all conditions ??? and taken a map from that ??

very brave if you ask me

Mark Shead

You need to reread the post to understand what they are saying,
When you use the Autronic to its full potential with the set-up paramitors i.e Comp ratio,Injectors size against cylinder size,then target AF,and charge temp, tech all you need is one load site as the Ecu has worked out the VE of the engine and the main fuel table is just a trim table,
Say the typical ecu will need circa 20rpm and 15 loads points to be able to run the engine to its full potentail, This can make the tunning long winded to get it right,
So say on a typical Autronic set up you can use circa 7 rpm and 5 load and the fuel table is as good as another Ecu running upto 3 times the amount of info which make mapping much less stressfull and quicker on a engine to get it right,
I know of no other Ecu that could do this,
What would happen if you only had 1 load table in any other Ecu with no lambda meter or contol hooked up,
Say weber put a load point at 3k and it will only fuel the right fuel at 3k massive rich below that if you could even get it to start would be amazing and melt the engine be 5k, This is what they are trying to explane.

Mark

GARETH T

madevelopments, thats a bit more clearer

but im sure you couldnt use the system on a highly tuned yb, or even cvh!

all the engine modeling systems i have had a look at aint really that great (i know there would be better ones out there )

ECU Monitor Enthusiast

iTrader: (1)

madevelopments, It is a good feature no argument

However, This feature is NOT unique to Autronic as Sunny has suggested.
I can name several other makes that can do this exactly .....

E.G Motec , Electromotive .....

But at the end of the day any system is only as good as the time spent on configuration
and ANY ecu can give equal results irrespective of its methods of setting up.

Stu @ M Developments

iTrader: (12)

So essentially the ecu calculates VE based on the user inputs for comp ratio MAF, ACT and injector size once it knows and confirms its AFR? (Or using speed density calculation if MAP and ACT only available)

Blimey, does it work ok?
I suppose it can do the full BSFC calculation if you add the BHP into teh equasion...

Mark Shead

I am trying it on a Escort cosworth at the moment once I have mapped it I will be deleting the load points in the fuel table and trying it,
Car spec Escort Cosworth SM4 Ecu,1000cc Injectors,T38 turbo, the rest stock, So once mapped and any surge sorted I will do a run and log the fuel curve ,
You did see what engine they tested it on a 299hp Honda vetec so the fueling req on this engine will be quite radical from tickover to 9k.

Mark

ECU Monitor Enthusiast

iTrader: (1)

Mark, Out of interest, How much is the SM4 going to be retail please ?

Mark Shead

I never saw it on any Motec I mapped but only upto M48 after that model started using Autronic and it was to any mapping on other Ecu's, Let other people play with them

Mark

Mark Shead

Simon I cant tell you yet.

Mark

ECU Monitor Enthusiast

iTrader: (1)

madevelopments, Fair enough, cant wait for a demo @ ND

GARETH T

if it works on that,, i would be very impressed would love too see it in action

markk

iTrader: (2)

that explanation makes sence , i too would like to see it before i believed it !!

but if it does work as good as you say mark , then - pukka !! maybe even i may change ecu's !!!

i will await your results mark , when are you testing it ???


mark

Mark Shead

I have the Car in now fitted the 1st SM4 in the UK, So hopefully I will be trying it by Thursday.

Mark

markk

iTrader: (2)

have you got a spec sheet on the sm4 ????



mark

Mark Shead

Yes But not on me, Loads more funtions and you can config many tables to work together.

Mark