[vince3]

I had a full bolt on car with E85 on a 2016 Camaro SS and I want to do the same mods to my 2022 LT1. Both manual.

Can i just buy HP tuners and use my old tune?

[6spdhyperblue]

What do you mean use your old tune?

You should be able to move most of the changes over to your new tune file. Just be aware that some tables have different column and rows so you maybe have to extrapolate to get to the same value for that point.
Keep in mind, if you had a wideband on the car to zero in the fueling, you’ll have to do that again now. Otherwise add a safety cushion on the fueling.

I would use new tune file then open a second window of hpt, open the old tune file and run a compare on your 16 original file and get to work.

[radz28]

Originally Posted by 6spdhyperblue

What do you mean use your old tune?

You should be able to move most of the changes over to your new tune file. Just be aware that some tables have different column and rows so you maybe have to extrapolate to get to the same value for that point.
Keep in mind, if you had a wideband on the car to zero in the fueling, you’ll have to do that again now. Otherwise add a safety cushion on the fueling.

I would use new tune file then open a second window of hpt, open the old tune file and run a compare on your 16 original file and get to work.

You could just use the COMPARE feature, too, and copy a lot of stuff over. I've found that having a second window for VVE/VTT is helpful, but for what it seems like he had before, it's probably not necessary to change those much, if any. I think using the COMPARE feature would make it a lot easier to see the exact changes, too. It will also show differences in scaling. E.G. I've changed the SPARK tables by lowering the RPMs from 8000 (I think that was stock) to about 7000, because I don't rev/shift much past around 6500. So - the lowering to 7000, that left a few open columns to which I interpolated where there were bigger jumps, like after peak torque (i.e. where the gaps in RPMs were larger, like around 5400-6200 RPMs). So - those larger jumps were split-up a little more.

[arpad_m]

Originally Posted by radz28

You could just use the COMPARE feature, too, and copy a lot of stuff over. I've found that having a second window for VVE/VTT is helpful, but for what it seems like he had before, it's probably not necessary to change those much, if any. I think using the COMPARE feature would make it a lot easier to see the exact changes, too. It will also show differences in scaling. E.G. I've changed the SPARK tables by lowering the RPMs from 8000 (I think that was stock) to about 7000, because I don't rev/shift much past around 6500. So - the lowering to 7000, that left a few open columns to which I interpolated where there were bigger jumps, like after peak torque (i.e. where the gaps in RPMs were larger, like around 5400-6200 RPMs). So - those larger jumps were split-up a little more.

Quick question, radz28: if there are fewer rpm columns (aka lower resolution) in a table, doesn't the ECM already do linear interpolation? Say, if you only have a 1000 rpm and a 3000 rpm column, the values at 2000 rpm would be computed and fall right between the 1k and 3k column values, right?

If yes, what other smoothing can you by achieve by inserting more columns (increasing the resolution)? Do you do bilinear or bicubic manually, or something else? I thought these extra columns were to allow the injection of necessary nonlinearity to begin with, otherwise you could have one value at 0 rpm and another one at 7500 rpm and you'd be done.

[KingLT1]

Some stuff you can use the compare feature and copy over but not all. Don't just flash the 2016 file into your 2022. The 2016's were the least fussy with changes. As the years have gone on, it's like AI was implemented into the ECM lol. The same changes can yield negative results. 22+ are very finicky imo.

[6spdhyperblue]

Originally Posted by radz28

You could just use the COMPARE feature, too, and copy a lot of stuff over. I've found that having a second window for VVE/VTT is helpful, but for what it seems like he had before, it's probably not necessary to change those much, if any. I think using the COMPARE feature would make it a lot easier to see the exact changes, too. It will also show differences in scaling. E.G. I've changed the SPARK tables by lowering the RPMs from 8000 (I think that was stock) to about 7000, because I don't rev/shift much past around 6500. So - the lowering to 7000, that left a few open columns to which I interpolated where there were bigger jumps, like after peak torque (i.e. where the gaps in RPMs were larger, like around 5400-6200 RPMs). So - those larger jumps were split-up a little more.

There are only three columns row values I got the courage to alter.

Flex fuel % timing mult, I changed that value recently from 80 to 70

The second, is the fan table I lowered temps in the column by 15*

Third is the maf


I am too concerned to change anything else as we don’t see all the tables in ecm. Change the values in the one table can carry into 100 other tables we don’t know about.

[6spdhyperblue]

Originally Posted by KingLT1

Some stuff you can use the compare feature and copy over but not all. Don't just flash the 2016 file into your 2022. The 2016's were the least fussy with changes. As the years have gone on, it's like AI was implemented into the ECM lol. The same changes can yield negative results. 22+ are very finicky imo.

Are you reworking vve on the newer ecm for light boltons lt2 intake?

I am tempted to go back to the stock vve. I think my 16 car liked this vve map better than this car. I can send you my tune file if you’re interested in taking a look at it.

[KingLT1]

Originally Posted by 6spdhyperblue

Are you reworking vve on the newer ecm for light boltons lt2 intake?

I am tempted to go back to the stock vve. I think my 16 car liked this vve map better than this car. I can send you my tune file if you’re interested in taking a look at it.

I would try the stock VVE with dynamic air disabled around 800rpm and see how it acts. Most light bolt-on stuff I have found to run fine with stock VVE. Are the stock VVE tables the same between both cars?

And I agree the background tables we don't have access to are a problem for some platforms.

[6spdhyperblue]

VVE were the same stock

[vince3]

I guess if I’m not going to really mess with it, a dyno tune might be better and possibly cheaper.

[vince3]

lol inflation. A dyno tune with E85 is now $950 here in Houston. I really just want a MSD, cold air, lt5 TB and e85 kit. I guess the cheapest route would still be a remote tune if I can find somebody with a HP tuners kit and just buy the credits?