Review tune C5 Z06 P01

[aaronc7]

Just a quick note on the logging stuff. I did a lot of testing on mine. The simple version and good rule of thumb is that is maxes out around 240 bytes. You can see the PID response length in the channel selector screen.

Just pay attention to total bytes and your requested logging rate. My normal log list is set up to do something like 18 bytes at 10hz and 12 bytes at 5hz. HPT can be smart and only request some at a very low polling rate, but other times it will end up logging it at a much higher rate than expected.. it tries to be smart about it, but it doesn't give you any real feedback as to what and how it's logging.

You can open a log, export to CSV with interpolation off and see exactly what it's logging and how often etc. Not something to obsess about too much but it's a good way to verify if something isn't doing what you want/expect.

[abc]

Your injector data is now mostly correct. The only issue I see is the flow rate is only slightly off, should be 117.4 lb/hr.

Your VE table is still a mess. I assume you have not ran a log with the current VE table? If and when you get more than a couple psi of boost, it's gonna be so rich it will likely dilute the oil and gag itself.

When you find your boost leak, don't just go smash the throttle to see how things are going. Slowing work your way up the VE scale, 500 rpm and 1 or 2 psi of boost at each interval to fill in the VE table and you will see the trend shaping up and you can then make adjustments to the VE table in portions you have not touched yet in anticipation of getting there on the next pull.

[edcmat-l1]

Guys I started out asking for help and I provided all the information. I'm trying to learn. I never said I thought I was a natural at tuning or that I was even right about anything. You went out of your way to review my tune and reply so i am thankful. I didn't get concrete info on injector data being wrong so as I was reading and researching a symptom of needing to scale was leaning out and ID provided a document on scaling so I went with it. No harm as its just a simple click to restore my previous tune. I smoothed out the VE table and changed the displacement. How can I ensure this is a 408 stroker the markings confirm but I just dont see how the guy who sold it would have had the wrong displacement and then lie about the engine. Could I log map, rpm, and cylinder air mass to determine if displacement is correct? Would a 408 stroker see 0.75+ g/cyl at WOT and a 5.7 would be more along the lines of 0.65? Please for the love of money would someone tell me what i need to set for offset as I assume that is what is wrong with my pre-scaled tune.

Attachment 162206,

Ok Ed please tell me this VE table looks a little better. Removed scaling and changed injector offset... just guessing that was the issue.

A couple of us replied the way we did because you tried to correct someone who has far more knowledge than yourself. And you used a couple online docs to support your claim.

Listen to abc so you don't damage your engine.

[C5Z06TwinTurb]

Great information, I had no idea and this makes sense. Curious to dig in and see. I am sure your connection protocol also influences this. Bluetooth or USB etc.

[gametech]

Great information, I had no idea and this makes sense. Curious to dig in and see. I am sure your connection protocol also influences this. Bluetooth or USB etc.

Do NOT try to log with bluetooth. Hptuners has all but admitted that the bluetooth function of the mpvi3 is useless. They have flat-out said it is too slow for logging.

[C5Z06TwinTurb]

This is very helpful, thank you very much.

just ran a log after making the offset changes and my AFR error percentage for everything under 85kpa is running about -6% rich but once I hit 85kpa it jumps to 10-28% lean as the PE enrichment calculations kick. I am going to make your flowrate change and start over with a long drive to New Orleans tomorrow. I will go slowly through the VE table and after 20 min or so stop and correct estimate and then drive again until its as close as I can get to AFR commanded percentage.

Tbh I dont know what a good looking VE table should look like I have only been using this software and researching for a couple months and the original VE table from the previous owners tune looked like Appalachian mountains. I know its not a pyramid I just figured out that you can rotate the VE table... omg this is gamechanger. Screenshot 2025-07-09 172527.png

I will update tomorrow afternoon after the drive.

[C5Z06TwinTurb]

A couple of us replied the way we did because you tried to correct someone who has far more knowledge than yourself. And you used a couple online docs to support your claim.

Listen to abc so you don't damage your engine.

Thanks dude, I apologize for being a douchebag.

[bk2life]

Thanks dude, I apologize for being a douchebag.

youre not.
its hard to show emotion when only typing words.
take the advice, learn from it, and keep going

[Alvin]

The VE will somewhat look like a dyno graph torque curve x RPM. By map it will be somewhat logarithmic

[abc]

show and tell.png

Here is a VE table from a centrifugal boosted setup, similar to your end goal.