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Decided to have my 03 base dyno tuned while the clutch was being replaced and this is what we ended up with. Let me know what you guys think and if I’m in the neighborhood of where it should be at this point. Car has a vararam intake,dynatech headers ,and mid pipe with high flow cats, slp loudmouth and also had the install 4:10 gears. Thanks
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For future reference when you want to diagnostics from a dynojet curve, you need
1. Smoothing = 0
2. Air Fuel curve
Without these we can't tell how its been tuned to what air fuel ratio and whether or not there is some underlying oscillation or harmonically active drivetrain issues.
The dynojet can reveal alot more about the vehicle than just power output.
In any case. The curve looks to be healthy, but with all the smoothing its tough to say how well it was timed or how much variation there is between data capture events.
See how the curve meanders up and down at 4k to 4700rpn? That is indicative of some issue, either spark moving around, air fuel moving around, or perhaps something with the engine mechanically. Tough to say with all the smoothing and no tuning data to work from. But it is very little thing, nothing to worry about at this point. I am only sharing particular sensitive characteristic tuning efforts.
I'd say if you still have the stock cam its pretty damn good. When diagnosing dynojets you mainly look at the torque curve for information. See how it peaks quickly at 2500rpm and makes a nice upside down U shape? That is a healthy engine typical curve, its what you want. If the engine sounds good (mechanically if the exhaust is very quiet you could hear the engine 'noises') and with a curve like that, its very healthy in terms of mechanical chain timing and cylinder flow and all the basics such as compression and plug performance.
Next time bring us a curve with smoothing=0 and an Air/Fuel curve attached so we can tell more information!
For reference I've tuned hundreds of cars and I'm very comfortable working with dynojet and diagnosing engine performance based on dyno outputs.
Ok,thanks for the input as this is the first time I’ve had a car tuned on a dyno. Was using a Diablo in tune before and emailing back and forth data logs to tune before, and we did have some issues there. They were saying the car was running way lean and to check for vacuum and exhaust leaks,but didn’t find anything. He ended up re mapping the maf sensor to take care of it.
the car also seemed to have excessive valve train noise with that handheld tune. It is very quite now so maybe the timing was more advanced?
Ok,thanks for the input as this is the first time I’ve had a car tuned on a dyno. Was using a Diablo in tune before and emailing back and forth data logs to tune before, and we did have some issues there. They were saying the car was running way lean and to check for vacuum and exhaust leaks,but didn’t find anything. He ended up re mapping the maf sensor to take care of it.
the car also seemed to have excessive valve train noise with that handheld tune. It is very quite now so maybe the timing was more advanced?
Well the way torque comes up near peak at 4k then drops makes me think the knock sensor is picking up knock and retarding timing, then the timing is gradually being put back in. This is why we need an a/f curve and more data to go on. IF the engine is lean or knocking, continuing to run it like that will damage it. I Recommend you purchase an AEM wideband sensor and install it immediately before going WOT anymore and observe the a/f ratio at least. All performance cars should have a wideband. You also might want to investigate getting the tune scanned so we can see the timing at WOT. IT should not be advanced much past say 22 to 23* for peak torque in LS engines. Alot of people think 24 or 26 is 'normal' but this is not minimum best timing for a reliable car.
You may also want to make an account on the HPtuners forum and look for someone with an HPtuners scanner tool so you can log your knock retard and timing while it drives around.
I have a feeling the engine could use some additional tuning from what you just told me in the last post. And possibly some other issues with fuel pressure, injector size, map offset, something like that
I have a 2003 6 Speed with blackwing intake and American Racing headers with high flow cats, ZO6 axle back and stock 3.42 gears. Mine made 332 hp and 350 torque on mustang dyno. Basically same set up and same results. I don't remember rpm levels but probably similar to yours. I had him leave rev limiter at stock settings.
Dyno results
