RomRaider

Hi Guys

I just bought at Project and all it needs is a complete remap.
Im from Denmark(Europe) and the local tuners is to busy(6weeks waiting time)
So im tempted to do it myself, i have experience with megasquirt.

I have searched alot in here and i think its a problem i dont have oem injectors, intake etc. When i need to scale injectors and maf?

The car is a Subaru Forester XT 2006(SG9), it has a fully built engine(cosworth) 740cc PE injectors, Precision Upgrade turbo, Cobb 3" catted downpipe, Process West upgrade intercooler... and a lot more.

To get it running i need to scale the injectors, but when scaling the maf its best with oem injectors right?

Im a bit confused, hope somebody in here Can Help me get on track !

Do you have a logable wideband O2?

Have you gotten Romraider logger up and running?

Can you share the rom that you want to base on, this will probably be your stock rom unless someone has tuned it before.

I would start by scaling closed loop maf, are the injectors flow tested and matched at 740 cc/min? Then I would use that as flow in my rom and adjust the maf to match my fueling. There is a really good program here for scaling maf, first closed loop and then open loop.

It's doable with both non oem injectors and intake, so no worries.

Yes i have a WB that is logable, tHe more i read in here im getting very curious on SD and merpmod, if i just could talk with somebody who has experience with it

I am waiting to get my cable, AS soon AS i get it i Will post the rom !!

I generally recommend to start off with a good regular tune before moving to other roms, then you always have a fail safe as a back up.

Naturally this depends on how experienced you are at tuning.

That's a tough one.

When you have no injector or MAF reference, it's kinda difficult but not impossible. Always start with injectors first. Get Latencies right from the injector's datasheet. Scale the flow accordingly to their size and your fuel. (Pump gas, E85, E100, etc.)

From there, your injectors will be pretty much good to start, and you can now rely on scaling your MAF. If your using pump gas, it will be easier to tune injectors cause you will use the exact gas flow rate in your flow scaling table. Otherwise you will need to compensate for the ethanol fuel in that scaling.

I already tuned a few cars that had swapped intake + injectors. My advice is don't 'over-tune' or 'under-tune' your MAF scaling to preserve Engine Load figures. Some people ends up compensating low maf scaling with higher injector scaling or the other way around. Remember that MAF takes a big part of your tune, the MAF Scaling will throw your Engine Load all over the place, and with engine load comes Fueling and Timing tables, along with a few other important tables...

Too high of a engine load and the car will run richer and with retarded timing. Too low of a engine load you may run lean and knock from too advanced timing as the timing table will not hit desired values in the load column to retard the timing as load increases.

Be careful and work in small steps, watch your AFR X Timing X Boost and you should be good to go.

Ok - status update:

Got a Tactrix cable and after a lot of time and help from here(thanks!!) i finally got the tune from the ECU, first step was to scale the injectors.
And here i found the first surprise(the happines from take over a project), the injectors is not 740cc PE injectors but Denso 2450 850cc from a RX-7, and from what i can read about them they have a very bad spray pattern. in the future i will convert the system to top feed injectors, but from now i decided to mount some decapped yellow injectors.

I tried to start the car with the 850cc injectors and only change in the tune was scaling the injectors from 550cc to 820cc, i turned the key and car idles ok in 60sec with AFR a little lean(~15-16), but suddently it stalls and turns off.

I will upload the tune later, hope you guys can help me!

Here is the tune from the car, a lot is done but it seems like injector and maf settings is pretty stock in the tune?

It's not the worst tune I've seen, but you are correct in that injector and maf settings seem to be stock. Didn't dive deep into it, the design of the fuel map is to perhaps get rid of a rich dip?

This is a new "world" to me, trying to get hold in the OEM ECU system, i decided to start all over with at stock file, turned off the nedded error codes like TGV's etc.
adjusted Injector Latency and CC and it starts and idles very well now with AFR about 14-15!!

But it still Stalls when Idle in 30-40 Sec and the RPM goes from 1100 to 800 ish, i dont think it is because of the Cooling water temperature rises(Idle Speed Target Tables), because its the same symptom every time i start it, even when the cooling water temperature is high.

I looked at Romraider Logging, and it got connection, but what parameters should i log??

Its a lot off patience when tuning this way and i cant do it live

Update!,

I got the engine runing, after hours of searching i finally got the latency values and scale for the injectors.
It helped a lot, car keeps running now

i tried to drive it and made some maf logging and corrected it after a lot of driving, it runs better and better BUT, i need to be very gentle with the throttle and it stalls heavy and fells like the engine is jumping if i am to fast at the throttle and it get a little boost.

Is it at Tip-in throttle enrichment problem?

Okay two steps forward and one back, my crank pulley got lose yesterday, to my "luck" it happened in idle and no damage happened!

Have you ever tried to start log on your MAF, then drive around 1,5 hour to find out that you are logging on the injectors
So here it is, a log on my injectors i cant use for anything!

After that my laptop run out of power, so not much happened today

I tried to do a log on differents things, but different things are missing? please look at the attatched log, what did i do wrong? and yes it is my first log

Hope you guys can help me on track

Today i got it running better than ever! But now i got clutch problems and i still have problems with the logger.

I forced it in OL and dropped the injector scale from 820cc to 668,87cc suggested from a new injector log.
Then i drove around in a hour with MAF logger and updated the MAF sensor scaling.

The AFR is fine when im driving normal, but if i put the pedal down it runs lean and stalls, i suspect it to be some kind of "cut" from the ECU?.

I would love to share a log, but i dont have succes with them yet, everything looks perfect when i start it, every datapoint reacts etc. but when i stop the log and opens the file, lot of the parameters is missing as the attached log from yesterday, anybody who knows whats wrong?

Is it just me or is it quiet in here?

The log looks perfectly fine to me. You must be set for a non-en_US locale using ; and , as separator and decimal.

I use open office on my workshop laptop and it seems to the problem, opened it in Excel and it works
Thank you for your feedback !

Open Office works fine if you set the correct locale in the import window to interpret the decimal and column separator.