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.

[C5Z06TwinTurb]

show and tell.png

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

Oh wow, I have a long way to go before mine will look like this. Thanks ABC for sharing that.

Had some time yesterday to work on it and I found the boost leak. My VS Racing wastegate was leaking at the diaphragm and killing boost. I made the repair and took it on a short test and my friend mr boost is back. I am planning to drive about 30 minutes through all of the ranges for idle and cruise so that it is dialed in before I move into WOT and PE.

I found a ls1 tuning guide online and wanted to run the steps outlined before I use them. I want to do this the right way.

Step by Step for SD tuning Wideband Method: *
1: Unplug MAF sensor
2: Disable the SES lights for MAF codes P0101, P0102, P0103 (No check engine light.) Do not completely disable the codes or the PCM will not fall into SD mode. Only turn off the SES light, DO NOT DISABLE THE CODES THEMSELVES!
3: Change all points to 1.13 in the Open Loop F/A vs ECT vs MAP table (commands AFR of 13.0)
4: Change all points in the Closed Loop Enable Coolant Temp vs IAT table to 250* (Disables closed loop)
5: Copy High Octane table to the Low Octane Table (computer reverts to low octane table when MAF is unplugged, this assure’s optimal timing)
6: Change all points in the Power Enrich Fuel Multiplier vs RPM table to 1.0 (disables PE mode)
7: Use your wideband and HPT histogram to verify AFR of 13.0 *
8: Make adjustments to the VE table accordingly to dial in a 13.0 AFR using the desired formula - current afr/13.0 = VE multiplier
Continue using this formula until all data has been plotted.
9: Hand smooth VE as described by Magnus (a smooth VE results in crisper throttle response), upload new .bin and repeat steps 7 and 8 until all cells in the histogram are 12.8 - 13.2.
10: Change all points in Open Loop F/A vs ECT vs MAP table back to stock (re-enable stoich commanded AFR)
11: Change all points in the Closed Loop Enable Coolant Temp vs IAT table back to stock (re-enables closed loop operation and fuel trim leaning)
12: Change all points in the Power Enrich Fuel Multiplier vs. RPM table back to stock (re-enables PE mode)
13: Use wideband and PE table to dial in desired WOT AFR. (Optimum HP at WOT) *

[gametech]

Do not even think about using 13/1 AFR as your target when in boost. That guide was written for NA motors, and it is a quicky starting guide to get them in the ballpark. Also, there is no legitimate reason to use that method anyway. The only part I would personally go by is step 2 on how to fail the MAF, and I would still leave it plugged in and just change the fail frequency to zero in the tune. Too many cars have the IAT built into the MAF to just go telling people to unplug it.

[edcmat-l1]

OP, your setup isn't exactly a beginner tuner setup. I'd recommend hiring someone with experience to get you much closer.

[C5Z06TwinTurb]

Thanks for the advice, glad I asked.

[C5Z06TwinTurb]

OP, your setup isn't exactly a beginner tuner setup. I'd recommend hiring someone with experience to get you much closer.

lol you are correct. Ed I did hire someone and gave them 650 and I came out worst I also live in an area with little to no tuners. Im going to give it one more shot and if I cannot get to a better tune then I will be open to suggestions for remote tuning as that is my only option. Working on it right now and VE is looking a little more like the example that was given, still ugly but not flat and not a full blown pyramid.
Screenshot 2025-07-13 184032.png

[gtstorey]

Edcmat-l1 or Alvin for remote tuning. And edcmat-l1 doesn’t directly recommend hiring a pro often.