Tuning larger injectors
- Thread starter dlshandera
- Start date
Do you have the flow sheet with your injectors? If so you will probably notice that flow in the idle area isn’t more than stock. So you can leave idle alone. If I had tuning already and knew the pulse I would compare at wot the effective flow for a equal amount of fuel and add 10 percent. Do this in the smallest tune and build up from that tune. With 60 overs you will have to cut some fuel in the say 50-80 mm area and blend for there on both ends if the tables. Start from this and make changes until you get your desired results. I have certain percentages of timing I like to see in each area of the table. Everyone thinks and does things all over the place. It’s about what you like and what works for you. I have seen tuning that was pretty bad in their philosophy and people thought it was really good.
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My 60 overs start to flow more fuel in the 30mm3 area around 100-110mpa. Seems below that it may take a fair bit a pulse to see more volume. Just takes a lot of driving and paying attention. I almost find having a notebook and recording seat of the pants feel and where it was felt (rpm, mm3 etc). Datalogs don't help a ton with that.
That’s a good way to note where you need to take fuel. Say drive around with the V2 monitoring and see where it’s doing something you don’t like write it down then make changes and see if you get the results you are looking for. You have to start somewhere to figure it out and that’s a good way to learn the ins and outs if it.
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For sure!! Everyone's injectors are going to be a bit different at idle/mid range. I first just focused on making my tune cruise in the 25mm3-30mm3 area on flat ground no matter the rail pressure. Then started working my way up the mm3 scale to get the feel I like. Everyones different but I like a digressive fuel curve. I like a fair bit more fuel at 60mm3 than what a linear scale would bring. The LMM for example downshift at 80mm3 with the cruise set, so I like more fuel before that point, so it doesn't downshift constantly towing. Also, by doing this, you'll find you don't need a crazy hot tune for towing. Example, my big tune is 2100us at 195mpa...my pump gets rail up to 187ish. My tow tune is only 1550, but is around 1400us at 80mm3. I also make my fuel pressure digressive also so I don't use big pulse numbers. The both combined you get fantastic towing results.
