Yes, as the economy was out at all speeds of driving, so a fuel base line was too rich from the readings coming back from TunerPro. Which is why I started at the injectors and the quantities they are putting in the cylinders at all rpm. Almost like a mixture screw on the old carby systems?immortality wrote:The thing is, you are using the injector flow rate to tune your idle when the reality is you are affecting every facet of the tune that used the base rate injector data.
If I am correct the adjustment of the Injector Base Rate should show the imbalances of the injectors. Which in theory I believe has done that. Only a injector flow test will confirm injector failings or imbalances though, which I hope to get to do the test in the next week or so.immortality wrote:You might be better off leaving the injector rate constant as it should be and figure out why the fuel usage has changed during certain conditions.
I agree, usually it would be the case, but I have ruled out what I believe to be likely other causes and this is a way I believe I can confirm injector failings or imbalance prior to spending what could be wasted money on new injectors if it isn't actually failing.immortality wrote:By your own admission you suspect a injector issue, tuning around the issue doesn't solve it. The LTFT and STFT are telling you something is off, your best bet is finding that something and fixing it before you start changing the tune wholesale.
That is just it, the tune was fine as new. It has only been causing issues since it was required to get a new ECU which I needed to flash with the TunerPro and the Enhanced version of Bin because of the original ECU failure. Without being able to recover the GMH original tune prior to using the Enhanced bin, I can't seem to be able to get back to where it was in the early years. Hey, what better way to learn than to know how it used to be, as to try and tune it to achieve the same it was back in the day. Without a dynotune of before (back in the day) and after. It is almost impossible to know the differences. But when I have driven all those (minus 42,000km) myself, I tend to be able to feel when the cars just not running to its ultimate as before, which is why i know something is a miss to it's health.immortality wrote:Just remember, the tune was fine when you first had the car and you are trying to get back to that. 500,000km is a fair distance and I'm sure some of the bits and pieces on the engine might be tired and need sorting first.
I might not have been too clear with the distance. The car has done that, but it is now the third motor, with the current one being rebuilt by myself for certainty of it's condition. Though the sensors all are from my original motor. So the injectors of about 3 of the 6 would be close to the 510,000Km use. Of the top of my head, this current motor I have now put about 70,000km on it, the main part of that on E10 fuels.immortality wrote: 500,000km is a fair distance and I'm sure some of the bits and pieces on the engine might be tired and need sorting first.
I am learning obviously to try tune it.This is the first and so far only EFI I have tried tuning. So I can only go by similarities to the days of a carby, points system tunes. Where I would get the idle smooth which would be timing, idle speed and mixture correct. Then move on to slight adjustments so at rpm where it might need more pick up and go, usually timing adjustments or second jets timing. So I am trying to work on the same concept with EFI. Not sure if that is the right way though yet.
I have noticed today after drive testing. That the 0-80km/hr feels a lot more responsive than past few weeks, while maintaining a higher (better) driving manifold vacuum below the 80km/hr. Though I will need to fill the tank tomorrow to do a real fuel usage check. While keeping in mind I have done a bit of idling during tuning and driving harder than my usual, so the economy should allow for about 5% more drop anyway. My plan is that once I have the mixtures and performance correct (to my liking) for the 0-80km/h range, it should be easy to adjust the things like AFR and spark timings for the upper ranges above 80km/hr?
I do appreciate all those who are giving their time and help with my questions. I hope that I can one day pass on my experiences to others as you all do to me.