Lund Nitrous Tunning Issue

[markmurfie]

When you double click the line it groups it on the right side to that single scale, or moves it over to the left side and auto scales depending on how max/min values of the selection you are looking at. Normal data zap view setup stuff.

Yes spark peaks at just above 31, then drops back to 25 right in the middle of the pull then climbs back up to 27-28. His drops in the higher RPMs instead of continuing to climb, but nothing to be concerned with. Pretty normal 15-17 coyote close to it's MBT curve. Maybe just a little higher than the stock curve at sea level or thats where the load/MAP is putting it based on a slightly lower airflow than expected.

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[Coyote Chris]

I’m at 940ft above sea level, this data log was took on the dyno in 55 degree weather.

 

[markmurfie]

I’m at 940ft above sea level, this data log was took on the dyno in 55 degree weather.

Post your nitrous log in data zap, to have something to compare NA to.

 

[Coyote Chris]

https://datazap.me/u/coyote-chris/nitrous?log=0&data=1-5&solo=5&zoom=0-418&mark=241
This is the only nitrous log I have, this is the first tune I was sent which I was told it looked really good, even though they did send me an updated one and it was left at that.

 

[markmurfie]

Yeah, 22-23 degrees, most of it coming in from the knock advance. Just a tad lean, probably fixed in the next revision.

If you are having hiccups. There's nothing in these logs pointing out the why. I would start with simple fresh plugs, gapped maybe a little tighter. Then if you still have problems move to compression and leak down test.

 

[K4fxd]

Just a tad lean

What lambda do you want to see with N2O?

 

[markmurfie]

What lambda do you want to see with N2O?

.82-.84 for a small shot

.78-.82 for larger ones

Very similar to boost. Higher levels are just safer on richer lambdas. You can run pretty lean and still be safe on higher octane fuels, and well controlled combustion temperatures. No crazy high IATs, CHTs, or ECTs. WOT lambda is always going to be a power plateau between .78-.88, based off expected heat and detonation.
I'm looking at fuel trims in the logs. When I say rich or lean, its relative to what is being commanded. Combustion events have to happen before O2 sensors can report that they did, so while AFR might show .80-.82 through a pull, 1.10 STFT is 10% lean. Meaning some small number of the events were lean. The feed back is quickly keeping it safe, but the less it has to work, the better everything is for safety and performance. All of it could be considered stoich or rich with stoich as the reference point, so there's really no danger from fueling.
None of this is even close to where you would run into problems or should even notice anything.

 

[FruityJudy]

So on Datazap, saftot has already taken into accout the timing advance from the knock sensors?

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