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Did you carry the IFR over from the first cell and hold it steady across all kPa? If boost referenced, you only use the first cell.
Also... your VE may be off. Set the IFR and then tune the VE.
Sorry, I'm not sure what you mean. Are you asking if I used the first value and copied it over all cells? Like a flat IFR? I had to scale it back and interpolate. First value is 69.3.
VE is spot on. Not sure if it had to do with 58 psi fuel pressure.
Sorry, I'm not sure what you mean. Are you asking if I used the first value and copied it over all cells? Like a flat IFR? I had to scale it back and interpolate. First value is 69.3.
VE is spot on. Not sure if it had to do with 58 psi fuel pressure.
I also had to remove a percentage from the offset from 12v on up.
Is the data 100% accurate? If it is, I can change it back and mess with VE. It was just that my VE was perfect with the old 36lb.
I'd always rather have 100% correct injector data than anything else. VE can be retuned. Can someone please confirm that the SD 60 data is 100%?
Data for Siemens 80lbs Injectors. EFILive and HPT data. I'd leave the Fuel to Wall Transient stock. But if you notice any lean or rich conditions on throttle tip in, modify to this. The Min Fuel Mg or Transient Min Mg is a pulsewidth adjustment for idle. Do change this.
The rest are standard issue adjustments. If you have a boost-referenced FPR, just use the IFR Flow at 0 and carry across. Same for the offset table. Use the values in the 0 column/row (depending on EFILive or HPT) and carry across.
Thanks heaps for posting this data you have saved hours! Just wondering about your flow rate vs kpa. The numbers seem really high and are past the default limit of 32g/s. I'm running an ls1 p01 ECU if that makes a diff. I would have thought they would be around 12s?
The 80lb Deka data is my saviour! Tuning my 383 on e85 with these injectors and data. The car has never driven better or been easier to tune. Cold start with e85 fire up and idled straight away (248/258 112 cam ls1 383)!
I changed the IFR numbers to suite my OS and all is good 👍
i used jakes spreadsheets for deka 80's using efi live. Anyone want to take a look at my tune to make sure i did it right. Transient Min Pulsewidth:0.016 and Short Pulse Limit: 2.508 where the 2 i was confused about. Thanks
Seems to be a common occurrence here lately with larger injectors.
PSA -- If you install larger injectors, in addition to the injector data, if you have a "Min Fuel mg" field in your transient fueling, you MUST reduce this value or you will be stuck with rich idle and other driveability issues. Also, recommend setting the transient RPM to a number higher than idle speed. I figured this thread was as good as any to put it out there.
Reduce it by how much? Min INJ PW divided by 31.124308? That would put it at 0.0233
Stock tune shown in HP Tuners has Min Fuel Mg set at 0.045 and my tuner put it at 0.041.
Min RPM is set at 300 rpm and Max TPS is set at 5%, which is same as stock tune.
Only other thing changed in Transient settings was the initial Time Decay Mult vs ECT. For engine coolant temp ranging from -40 to 90, the multiplier was increased anywhere from 0.27 to 0.85 depending on the coolant temp.
I'm using Deachwerks 18U-01-0039-8 and the injector control info was changed based on the data in the attached file.
Last edited by 5.7stroker; Oct 14, 2018 at 02:17 PM.
With those injectors, I would drop it to 0.020. I use .010 for 42 lb injectors as a default. I've seen some really big injectors where people just use zero.
I saw something about Min INJ PW divided by 31.124308
That would put it at 0.0233
I'm not seeing rich idle so I may leave it as is.
yeah, that was the old rule of thumb, but it doesn't always seem to hold true. My 42's had a minimum pulse of 0.8, which is in the 0.025 range, but they did better dropping to 0.010. But if you are not persistently rich, then don't worry about it. my point is that just changing the injector flow rates does not get you where you need to be on big injectors. 38's aren't ll that big, so less of a problem.
jake see below, my 60# are tuned to work great in my set up, the 80 on your spread sheet are way different. what am I missing?
Originally Posted by JakeFusion
Data for the 60s.
this is my siemens dekka 60# in efi live. tuned really well with this rate. trying to go to 80# based off your data and it looks way different. what am i missing?
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