[IneedAZ]

Working on my modded 2017 Zl1. I decided to try my hand at VVe tuning for the 1st time. The car was tuned MAF only when the mods were done.

Question #1 When i have my VVe tune loaded the check engine light comes as i knew it would cause of the MAF fail. However, i didn't expect the car to be in Reduced Power Mode. I read somewhere that i need to adjust tables P1514 and P0068. Is this correct?

Question #2 Being that the car is a 10spd, i am having trouble getting the higher RPM data. By default i see the VE is supposed to go til 4000rpm. During my outing last night logging and adjusting i could only get to ~2200rpm. I varied my speeds up to 60mph and at times downshifted a few gears, but still only got to 2200 and some 2400 hits. How do you do the 2200-4000 range?

Question #3 Not sure if the issue i am experiencing is due to i am using the latest Beta release as of yesterday, but after i paste special and hit the Calc Coef button some of the area will come up with some Way out of range numbers. For Example, i had 2 row block of numbers to be adjusted 10% which was fine, but when i hit the Calc button that row changed from "Lets Say" 1800 to read very high like 29000 and in some cases it went to a negative large amount. Unfortunately the undo button is grayed out after u hit the calc button so i have to exit without saving and try again. Can anyone explain how to not have it do this? It has done it more than once.

Would appreciate any insight on these 3 issues i came across.

thanks

[IneedAZ]

Well, I don't see a p1514 table that Bill at HPT mentioned. So if anyone can offer help, I would appreciate it.

[IneedAZ]

Well, let me ask this...Do you guys tune Maf and or VVe using your wideband sensor(eq error) or your LTFT(narrow band sensors)?

I had been using my LTFT and Wideband for PE. But i see a lot of folks use Wideband for everything.

I do notice a difference between my readings LTFT vs Wideband %, so which do i believe and use for my adjustments?

Oh, i still cant seem to not be in reduced power when logging VVe, how do i not be in reduced power for this?

[radz28]

I think there are a couple conventions of thought. I think both will agree, though, that A10s need VVE tuned, though it still isn't a 50/50 split.

I think some people use LTFT/STFT blends in steady state. Some have said they trust those values more than WBs. WBs are used to tune WOT and all that.

I set my 101,102,103 codes to "No Error Reported". MAKE SURE TO DOUBLE CHECK THESE. Somehow, I had the 103 turn itself back on and I'd go into RED. Double check.

Q.#2: Do you mean the car is not rev'ing into those ranges, or you just can't get into them? If you mean the car is shifting by or through other regions, and and you aren't having an issue with RED, I'd say you will have to hold gears more, and drag the brakes to get into the higher load areas. So, as you work our way down the Pressure Ratio axis, you are trying to load the engine more. To get into these areas, I hold gears, and will drag the brakes to get into the higher PR cells. Be careful with knock, though. I run octane booster just so I can get into these areas and try to stay safe. Just monitor retard when you're doing this in this area. There are going to be lots of cells in the higher-load regions that are difficult to get. I try to touch as much as possible, and then kinda' extrapolate the areas around. Unless you lug your engine a lot, these aren't areas you'll likely get into much. Otherwise - high RPM-low load areas aren't too bad.

I'll tell you that on the street, you'd be pretty expert if you can get good hits in most of these cells within less than 20-30-minutes of driving. The more times you can hit the cells, the better fidelity the numbers are, and the better you can manipulate the VVE table.

Q. #3 - I think I'd offer to just be careful in what you're pasting. I used to copy the corrections from the Scanner, and paste that entire table into VVE. I'd hardly get the corrections after Calculating. What I usually do, is open a few Editor windows with the SAME files. I'd open all of the VVE tables in all of the windows (again - like 3-different Editor windows with the SAME file you are tuning, with the VVE tables open). Then, I'd leave the 1st-window alone - NO changes. Then, I'd use the 2nd-window and take the entire copied Scanner and paste it into that 2nd-window. DO NOT Calculate. Then I'd take that same Scanner file, and paste it into the 3rd-window, AND CALCULATE. Then, I'd compare what the calculations came to, visually compare to the 2nd and 1st windows and see how they came out. Then, I might manual adjustments from there to try to get the 3rd-window to match the 2nd.

Now - I take the ZONES, and copy each zone, separately from the Scanner, and paste each Zone on it's own. That keeps the transitions along each Zone from going to crazy and ultimately make changes to the Zones around. It just seems to keep it cleaner. You have to stay organized, though, and go Zone-by-Zone and calculate each Zone before moving to the next.

There are experts that have better ways to do this. This way worked well for me though. I was working to getting close to within 5% in most of my cells before I made my last mods. Just take your time and be careful.

VVE is a walk in the park until you get to VTT, if you need to get into that... HA

[Joshinator99]

I agree with @radz28, I use LTFT for part throttle tuning and WB for WOT.

[IneedAZ]

Radz28, Thanks for all the feedback... I will try the no error report as The Tuning School said to set it to error on 1st. Did you read codes after to verify those code were thrown and you were in fact in SD only?

[KingLT1]

If you are tuning Closed loop then you use LTFT unless they are disabled, then you would use STFT. If you are tuning open loop PE mode, then you use your Wideband and log AFR error.

To get up in higher RPM cells, drive in Manual mode. This will allow you to hit different cells up at higher RPM's by holding a specific gear. I will normally rev a couple gears out to 4500-5k rpm with light throttle so it doesn't switch to PE mode. Do that in a couple of the lower gears going down the road 45-50mph and that should get you some good data.

[radz28]

OH!!! You might have to force Closed Loop options in the Scanner off, too. They're under the Engine/Fuel tabs, if I recall. I have to go in and force them off when I'm scanning and trying to rune VVE. You might not need to, but I did/do.