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Old Sep 7, 2018 | 07:04 PM
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Default Bracket racing consistency
Want to install a 6.0 in a Vega drag car. A tuner said to leave it fuel injected. My question is fuel injection consistent? Or do you have to write a specific program for car? I am not sure how fuel injection can stay consistent. Run a carbed 6.0 in a Camaro now and after time trials put dial on window and car runs same numbers all day.
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Old Sep 7, 2018 | 09:35 PM
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My ls1 does pretty good but it seems to get quicker as the night goes on... especially when the weather gets cooler.
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Old Sep 7, 2018 | 09:47 PM
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As consistent as a carb car on gas. They will both consistently change with weather. Depending on the weather, I can tell you exactly what my car will run before I make a pass.
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Old Sep 8, 2018 | 05:38 AM
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Originally Posted by Rick01SS
As consistent as a carb car on gas. They will both consistently change with weather. Depending on the weather, I can tell you exactly what my car will run before I make a pass.
What kind of tune do you have? Thanks
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Old Sep 8, 2018 | 07:59 AM
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is it open closed loop program or lock out program?
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Old Sep 8, 2018 | 04:52 PM
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Originally Posted by tom70
is it open closed loop program or lock out program?
You want olsd. Open loop speed density.
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Old Sep 9, 2018 | 01:00 PM
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Originally Posted by nj02z
You want olsd. Open loop speed density.
​​​​​​How will it stay consistent with that program please excuse my ignorance have worked with carb set ups my whole life
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Old Sep 9, 2018 | 03:15 PM
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Originally Posted by tom70
​​​​​​How will it stay consistent with that program please excuse my ignorance have worked with carb set ups my whole life
No maf sensor,no o2 sensors.Your tune will have a VE table(volumetric efficient) that will use the MAP sensor and RPM to put a desired amount of fuel in.You basically take the cars ability to correct itself away.It works.#1 and #6 best package 200 plus cars.
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Old Sep 9, 2018 | 03:24 PM
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wife,s car.

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Old Sep 9, 2018 | 07:49 PM
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Originally Posted by nj02z
No maf sensor,no o2 sensors.Your tune will have a VE table(volumetric efficient) that will use the MAP sensor and RPM to put a desired amount of fuel in.You basically take the cars ability to correct itself away.It works.#1 and #6 best package 200 plus cars.
Thank you couldn't figure out how it it would work but now I am starting to see. Do I set up a program from speed densidy and it will stay the same
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Old Sep 9, 2018 | 08:15 PM
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I'm SD tuned. It'll run the number over and over, if the weather stays the same.

With SD tune, your afr is solely based off your VE table with nothing adjusting it. As weather changes, you'll predictably go up and down with the weather. Of course everything you do has an effect on your ET; Burnout length, bump in, launch rpm, etc.
Last edited by Rick01SS; Sep 9, 2018 at 08:26 PM.
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Old Sep 10, 2018 | 04:12 PM
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Originally Posted by tom70
Thank you couldn't figure out how it it would work but now I am starting to see. Do I set up a program from speed densidy and it will stay the same
I have not switched my tune for 2 years ,same tune spring, summer and fall 45* to 90*.There are a few more tables that would need to be zeroed out.
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