Tuning question 21ss

[bkg06gto]

Thankfully learned some, especially from TriPinTaZ posts and Higgs bosson (thank you both for always contributing), but now I'm at a wierd spot and it may be me ovethinking.

Car is a 2021 SS, rotofab and flex fuel setup with 79 percent Ethanol 99.9 percent of the time.

I've followed the basic flex fuel setups, car hits about 25-27 degrees of advance (thanks tripin for pointing out it was way too high originally) but it seems like no matter what I do, the car doesn't report torque numbers like I "think they should". Fuel is dialed in, it's reporting ethanol correct. But it at most hits 460/470 torque and down to 300s by shift in the logs. I've gotten it higher, but only by increasing the virtual torque and driver demand so high it doesn't make sense.

Also, no spark pulling and throttle open 100 percent. Car is currently MAF only.

What I've tried.
1. Cam table high dialed in, zeroed emmisons area.
2. Virtual torque playing around
3. Driver demand changes
4. Peak torque changes

All of these have provided hit or miss numbers. But always ends up avg 460ish- 480 max.

Is it VVE holding me back since i havent touched it? Another table im missing? Any ideas where to start?

Sorry I'm working odd schedule today so don't have my laptop with me to post files, more of a brain picking session at the exact moment.

[GHuggins]

Did you make sure your hitting the correct fuel ratio on e85? Only reason I ask is because there are two multiplier tables that occasionally need to be dialed in on e that directly effects that kind of stuff. Fuel is torque after all. Besides transmission is there a reason you want it higher anyway?

[bkg06gto]

Its coming in at .87 give or take a percent.

Bluntly thats my overall confusion here. I realize the idea behind the relationships and read up on how they should line up. I think I'm too stuck on the number. If it's not a "real number" ans I shouldn't worry about it being higher instead worry about the calculations that lead to it. Then fine I can accept I'm overthinking.

[Ben Charles]

Tq model needs fixing..

[bkg06gto]

Would the start be VVE tuning? From some reading it seems even disabled it still is a factor in the torque model

[bkg06gto]

To clarify the MAF is spot on. Really nice trims. No knock (but with 80 percent Ethanol that's of no shock lol). The torque things I've returned to stock

[Ben Charles]

I would want that setup on alcohol especially with a factory trans tune to read 500-550tq, this will do wonders for the trans as well

[Ben Charles]

Would the start be VVE tuning? From some reading it seems even disabled it still is a factor in the torque model

It’s always active, regardless what you set disable too on dynamic airflow

[bkg06gto]

Thats kinda what I was thinking. I just don't know where I'm not getting it at. I've played around with torque tables editor, DD, peak torque and I've hit 500 once. And only once..past that 460-480 peak and drop to 300s up top.

[bkg06gto]

So here's what I'm assuming then.

Dial in VVE
Adjust Torque tables
Adjust driver demand

[bkg06gto]

The VVE side, do you set the CAM to a static degree dial in, rinse and repeat using a error histogram

[TriPinTaZ]

You're doing too much. No need to touch VVE for just an intake and flex fuel. You don't even really need to touch Driver Demand if your torque model is dialed in. There are some nuances to getting a flex fuel setup driving just like stock. Most of it is in the torque model.

[bkg06gto]

Oh, I see what you mean. I was taking torque model as the entire system. Not the literal tab. Makes sense.

[bkg06gto]

Overthinking isn't a virtue lol

[bkg06gto]

Guys I just want to admit some shame, I didn't realize alot of these tables were in NM and not lb-ft. Makes sense now completely once I changed it.

[Ben Charles]

NM is higher then Ft lbs..

[bkg06gto]

Thats the odd part, when i changed the units to lb ft they were all max of 460ish. I upped em and boom, commanding like I feel it should, no throttle issues etc. Runs and shifts beautifully

[BDPhoto519]

I am no expert by any means, so take my post for what its worth.

But I would expect real world TQ to be in the 470-485 range for just having a CAI and Flex fuel and a decent tune to be honest, so I don't think you are THAT far off from calibrated.

With your current setup you really shouldn't have to change very much from the OEM tune aside from rescaling the MAF curve slightly for the CAI and the required changes to setup the Flex Fuel. I have found so far, the closer I can keep the configuration to OEM the better and more consistent it seems to perform overall.

[TriPinTaZ]

There are offset tables for e85 in the spark section that will affect the calculated torque. You need to account for this in the E85 Virtual Torque tables or you need to negate the affect of these tables.

[bkg06gto]

I appreciate all this info guys. I did end up upping them, the car actually performs like I would expect it to now. The torque numbers all line up as well according to how I've seen trippin and others have said in various posts (relationship between peak, delivered, indicated etc)

What truly started this path was I didn't feel it was making accurate numbers, the car also ran the exact same times as it did stock. Literally Same mph give or take driver error. To top it off, when you would go WOT, not only I but if someone was with me felt the car had had something holding it back or pushing it back. So I decided to revisit it. It shifts amazing now very smooth, went from feeling stock to breaking the tires at 50mph.

Taking it to the track this weekend. Will see what happens.