Fg Xr6T Tuner Help Required

[turbotrana]

I can see that the original tuner played with the dashpot function to try and rectify the stalling issue. I put them back to stock figures. So far I can see its just an injector scaling issue as I seem to have no stalling with the G302 injectors after a little bit of a play. At least having the scalars to this injectors was a good starting point.

These were the scalers used for the Nizpro drilled injector that was causing stalling

Hislope 80.50541

Low slope 70.75812

offset @ 14v 0.76

PW min 0.95

Breakpoint 0.001480lb

Ralphy, do you see anything out of the ordinary with these figures other than the 1.5ms thing being around 1.71ms

[Ralph Wiggum]

Got the scalers for the g302's? Where did you source them from?

[turbotrana]

I am talking about the Calibration Summary sheet that Ford Racing put out. Extracting the scalars from there

[IH8TOADS]

I won't talk about your scalars because they have defied the laws of physics.

But that 1.5 thing you are taking about does not apply here. That's a deka 60 thing......in ALL cases you need the sum of the logged injector pulsewidth (via xcal) and batt offset value to be greater than the minimum pulsewidth value in the tune. Every injector type has unique scaling but the same 'principles' apply. For example a deka 60 idles at ~1.6ms, a 72lb nizpro at ~2.0ms, an ~ID1000 at 1.8ms...etc. Trana you can calculate what your nizpro 80's idle at. SO you can run a higher min pulsewidth with a nizpro injector compared to a deka 60. This is why trana wasn't riding the min pulsewidth at idle. His lambda 1.0 idle pulsewidth was higher than the sum of the batt offset at operating voltage and the min pulsewidth value in the calibration.

The minimum pulsewidth referred to on the ford racing calibration summaries is actually a statistical analysis. Basically it's the pulsewidth at which the injectors calculated and actual delivered fuel mass varies by more than 5%. In the PCM calibration it merely a figure by which the calculated pulsewidth can't go below.

[turbotrana]

Thanks Toads, makes sense

[FGX 40T]

  On 05/11/2012 at 9:48 AM, towsw001 said:

Still travelling alright FG09T?

Have you tried tuning again or has it reoccured at stock?

Unfortunately no I have not had the car retuned. The car seems to be driving fine at the moment. The revs have slightly dipped (only a couple of times since returning to stock) - to maybe just below the 500 rpm marker, but definitely no shudder, surge or stalling. I have considered having it tuned on the stock injectors - but at this stage I don't want all of the hassles again. I guess I could always reflash the stock tune back in if it did start to play up again. I would love to say once bitten - but I have already been bitten twice - so far.

Edited 09/11/12 08:22 AM by FG09T

[01txr]

There is numerous things that could cause it, the most likely is your dash pot, decay settings.

From there you have compensation tables they can affect it.

Is it any different when car is cold or warmed up.

There is also a anti stall setting off memory to.

Could also be the injector shut off settings for off throttle, maybe staying switched of to long.

Best go to another tuner as sounds like the one who tuned your car is not very experienced not wanting to move away from factory settings.

Pending your injector type, there is a big difference in value settings as to factory injectors.

The tuner has to be able to adjust them to suit not try retaining factory settings.

Back when the Siemens hit the market for the BA's lots of tuners couldn't get them to idle and just past on having anything to do with them.

The smart ones figured them out, Danny thank you.

I spent lots of time refining my injector tune with the Siemens and could idle it right down to a silk smooth 450rpm and returned 8.2 liters per 100k highway. To4z setup, plaz plenum, xforce exhaust etc.

Find out what injector values he set, Go see Simon at XFT and see what he thinks if the set values.

[FGX 40T]

Some additional info - My car was originally tuned with 60lb Deka's. I had these swapped to F6 factory bosch injectors as the Deka's were causing some issues. The issue was with cold start - the car would run rough for about 15 seconds and pulsed down the driveway as I tried to reverse. The tuner tried but could not rectify - so I changed to the F6 injector thinking it would fix the issue - it did but the other issue arose. However, thinking about it, my car's idle never dipped nor did the car stall with the Deka injector - the car drove perfectly once the initial cold start issue. Not sure if this helps.

Edited 11/11/12 07:58 AM by FG09T

[JETURBO]

Get a new tuner bud

[01txr]

Go to a decent tuner, sounds like he doesn't know even how to sort injector values.

There is lots of tuners now that know how to tune deka's I'd say Danny helped quite a few.

As I said I had mine idling as smooth as silk at 450rpm & you could hardly hear it even running.

That was with 60lb deka's.

no cold idle problems or any other. Returned 8.2 litres per 100k highway and around 10.0 city pending driving mood.

Now this is the first ever computer car I've ever tuned and I was able to get it to idle, run and perform very well with initial values from Danny.

If a amature tuner can do it, then I would expect a professional tuner to do even better.