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SVTPerformance's Chain of Restaurants
Tuning À la carte
Tuning with a adjustable fuel pressure regulator
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<blockquote data-quote="flyboy1294" data-source="post: 14869697" data-attributes="member: 152937"><p>I'm running a very similar setup with my car. </p><p></p><p>First off, set the fuel pressure with the car off and cold, and the fuel pump running. The fuel pressure gauges are very susceptible to heat soak depending on where you mount them. The fluid inside the gauge heats up and builds some internal pressure, so it shows your fuel pressure as less than it really is. Datalog "Pressure_drop_across_injectors" to verify that you are at your target fuel pressure. This is measuring off your FRPS and is very accurate in my experience. </p><p></p><p>You should not need to take away any fuel under boost. Your fuel pressure regulator's job is to keep the delta fuel pressure at whatever you set it at with the car off. When the vehicle is off, there is no boost or vacuum being applied to the regulator, so you are setting the true base pressure. When the car is at idle, you will see the fuel pressure drop to roughly 32psi or so because the car is in vacuum. 32psi -(-10psi <-vacuum)=42psi which is what you set it to. Then when you go into boost, the car will add 1psi fuel pressure for every 1psi boost that you make. So if you are making 10lbs of boost, you will have a max fuel pressure of 52psi, but the delta fuel pressure will be 52-10=42. Does that make sense? </p><p></p><p>You will need to adjust your injector specs to account for the 80s before you do any tuning. If I were you, I would first tune the car on 93 to run with the return fuel system and 80s, just so you were only dealing with a few changes at once. Heck you might even want to start off just tuning for the return fuel system with the 42s, then switch to the 80s and tune for them, then switch to e85. That is what I did with my setup since I am a slow learner. </p><p></p><p>There are 2 different ways to account fuel e85 needing to run richer. You can do like you said and add fuel across the board and that will give you a starting point. There are a lot of tables you need to add fuel to, though. It is easy to miss one. </p><p></p><p>There is actually a place in the tune that lets you set your lambda for the fuel, though. For gasoline, yours is probably going to be set to 14.64:1. You can change this to stoich for e85 which is 9.7587:1. This should get all of your AFRs reasonably close. I am going to use this method on my tune. There is just less stuff to screw up, and you won't encounter any surprises this way.</p></blockquote><p></p>
[QUOTE="flyboy1294, post: 14869697, member: 152937"] I'm running a very similar setup with my car. First off, set the fuel pressure with the car off and cold, and the fuel pump running. The fuel pressure gauges are very susceptible to heat soak depending on where you mount them. The fluid inside the gauge heats up and builds some internal pressure, so it shows your fuel pressure as less than it really is. Datalog "Pressure_drop_across_injectors" to verify that you are at your target fuel pressure. This is measuring off your FRPS and is very accurate in my experience. You should not need to take away any fuel under boost. Your fuel pressure regulator's job is to keep the delta fuel pressure at whatever you set it at with the car off. When the vehicle is off, there is no boost or vacuum being applied to the regulator, so you are setting the true base pressure. When the car is at idle, you will see the fuel pressure drop to roughly 32psi or so because the car is in vacuum. 32psi -(-10psi <-vacuum)=42psi which is what you set it to. Then when you go into boost, the car will add 1psi fuel pressure for every 1psi boost that you make. So if you are making 10lbs of boost, you will have a max fuel pressure of 52psi, but the delta fuel pressure will be 52-10=42. Does that make sense? You will need to adjust your injector specs to account for the 80s before you do any tuning. If I were you, I would first tune the car on 93 to run with the return fuel system and 80s, just so you were only dealing with a few changes at once. Heck you might even want to start off just tuning for the return fuel system with the 42s, then switch to the 80s and tune for them, then switch to e85. That is what I did with my setup since I am a slow learner. There are 2 different ways to account fuel e85 needing to run richer. You can do like you said and add fuel across the board and that will give you a starting point. There are a lot of tables you need to add fuel to, though. It is easy to miss one. There is actually a place in the tune that lets you set your lambda for the fuel, though. For gasoline, yours is probably going to be set to 14.64:1. You can change this to stoich for e85 which is 9.7587:1. This should get all of your AFRs reasonably close. I am going to use this method on my tune. There is just less stuff to screw up, and you won't encounter any surprises this way. [/QUOTE]
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Tuning À la carte
Tuning with a adjustable fuel pressure regulator
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