Procharged C7 closes throttle @ WOT !!! need help

[joecar]

even better!
i opened up the file and found the link
I'm going to, actually, use that on this car. I like doing the VVE tables and get them close because if the MAF ever fails it has a reference to fall back on to keep the motor from blowing up.
I also like to do those tables because on initial WOT stab, the ECM "looks" at the VE table until the MAF can catch up with commanded load vs airflow.

Yes, correct, during throttle transients below the dynamic air RPM threshold (typically 4000 rpm), the ECM is using VE.

And If the MAF ever fails then it's nice to have the engine still be able to run on VE.

[joecar]

Attachment 20384Attachment 20385

So, here is where I'm at.
It looks to be datalogging properly.

BUT, I'm still unclear on what I need to be changing it too.

I also am having another problem.
The car is WAY down on power!
Here is a pic from my dyno datalog: Attachment 20383
I am getting the boost! I'm getting the AFR right on. I'm getting the spark to be right there. My TB is staying open, like it should.
Seems weird to me that the power is so low.

BTW: you can do native Windows screenshots, much easier/quicker than using a camera ( I use http://getgreenshot.org ).

Is this on chassis dyno...?

[GR8GAME]

I use Win7... I have not touched Win10.

Me neither!
Until last night, hahahahaha. I don't like it. BETTER then Win8 though.
But the procedure ended up being damn near identical. So it worked out.

[GR8GAME]

BTW: you can do native Windows screenshots, much easier/quicker than using a camera ( I use http://getgreenshot.org ).

Is this on chassis dyno...?

It's because I didn't want to log-in with my dyno desktop. I just took a quick pick with my phone.

chassis dyno.

I think I figured it out. I'm going to datalog the "noise" from individual cylinders and see if it's true knock, or just noise from the blower bolted up to the driver side head.
It's pulling 2.5 degrees up top. So I'm thinking that I may need to deal with tables: B1975 thru B1982 I've already messed with B1967 thru B1974. I'm going to see if that works on this car.

[GR8GAME]

I'm hoping by keeping this thread alive, that people tuning C7's will get some help/knowledge of what other people are doing and coming across.
If you would like me to start a new thread, I can...

I hope everyone had a good holiday season!
I'm back to work and I have a different C7 on the dyno I'm working on.

2014 Corvette C7
Base Model
7-speed manual

A&A Ti Supercharger
Custom grind cam 232/244 on a 116 with about .615 lift.
AFM delete + VCT limiter
Stock heads
Stock manifolds with a "Cat delete" setup.
ZR1 3-bar MAP sensor
Stock intake and TB

During a pull it goes REALLY lean!!!! Into the 14's. And the crazy thing is...it's a COMMANDED 14!

I'm posting my file and my datalog along with my A/F printout.
You'll see in the datalog right at 4500 rpms it goes really lean even though I still "should" be in the realm of the PE commanded table because I am at WOT.
My dyno picked up the lean condition which is why I shut it down to avoid engine damage. Also note I haven't touched the injection timing.

I did make some injector timing changes to see if the numbers on the dyno changes. I'm also going to datalog the PID's for the fuel pressure next. So I will post those up as well after this next pull.

Any help would be appreciated, thank you!

(E92) 2014 MJ C7 STINGRAY (12662762)-DTC%27s off-0006A.ctz WOT 6A.efi

[GR8GAME]

I made some adjustments to my injector timing on this file.
I also included a datalog

I'm assuming this DTC I'm getting is due to the larger fuel pump profile on the cam...
P0004 Fuel Volume Regulator Control Circuit High

That is the only DTC I'm getting.
Maybe I need to shut it off....?
Either way, the commanded AFR going into the 14's is worrying me. It did move up 200rpms above the last file.

(E92) 2014 MJ C7 STINGRAY (12662762)-DTC%27s off-0007.ctzWOT 7C.efi

I'm at a loss here.
It seems like to me the car is going out of the PE parameters and going to stoich for some odd reason.

[joecar]

It almost seems like B0157 is upside-down...

[GR8GAME]

It almost seems like B0157 is upside-down...

I see it...But it shouldn't make a difference.
Because I opened up the stock file and it's the same way. I never adjusted it.

The way I'm seeing it, is at 4500rpms (which is where I'm having the problem) the table is saying that ANYthing above 4500 AND 70% load "should" allow for PE.

According to my datalogs, I'm meeting the criteria.

Or am I not understanding it properly?

[joecar]

That's how I understand it.

~Moderator~

[GR8GAME]

I figured it out...

And GM sucks for it, BTW!