Whipple surging at 3k rpm

[TAETOE]

Having a problem with a 2014 chevy 1500 with a 5.3L whipple charger everything else is stock.
the complaint from the customer is a 20- 30 kpa surge at 3k rpm. I've included the tune and the log.
If you watch the throttle input (APP) when this happens, its not my foot twitching! its doing it all on its own.
Its happing above 85kpa, it might fluctuate down to 70 kpa and around 105kpa. We are at 4800ft so anything over
83 kpa is pressure.

[MMGT1]

It is fine right to the point you go into CL. When you go closed loop the truck is using the MAF I see. With 4.8 PRC heads and an LSXRT 102mm I increased the base table by 10% and fixed the same issue. From what I read here guys 0 the tables out(I think they do this in SD although), this is just what worked for me before reading about the Predicted Tables here. I think you will have to increase the value if you are using the MAF.

[GHuggins]

This needs to be in the gen 5 section, BUT what's most likely causing your problems are your cam tables (0 them out in the lower rpms - look to the lt4 for guidance - can even use those tables if you like) then you need to have real numbers in your peak torque table - these ECM's are torque biased if you don't know that, then finally - go back to stock driver demand tables and smooth them out - only increase the last line if it's closing the throttle any... You might even want to look at a lt4's tune for guidance with this as well - just make sure the axis are the same...

These should hopefully fix where your throttle is opening itself at 50% throttle input...

[schpenxel]

Moved

[rjw]

check all 3 tables (the low.. med and high)....I had a situation where the high was not zeroed and truck surged...and I'm at sea level, go figure ...!!!

[TAETOE]

Thanks guys sorry for not getting back. I need to get this guys truck back in to the shop and work on the tables mentioned here. And I thought I put this under gen v section. All good info, so much to know!
Thanks again!
Wade

[rynez06]

been here before. Honestly referring to a lt4 file doesn't help at all, so much different about the file it, it really isn't useable. the only way ive been able to calm the surge is limiting the throttle angle at lower rpms.

[TAETOE]

Well I want to thank you guys for all of the suggestions. I did try to change the cam timing and and I did set the torque tables back to stock. None of this worked to reduce the surge. So I decided to do a holy mary and remove all of the limits on everything to see if that was controlling the throttle. It was! Surge is gone! Now I will start to put the limits back in one at a time to see which one is the cause. I'll post what I find as I can. By the way that tune made 466 rwhp corrected on my mustang dyne. 8 psi and everything else is stock.

[wesam]

Well I want to thank you guys for all of the suggestions. I did try to change the cam timing and and I did set the torque tables back to stock. None of this worked to reduce the surge. So I decided to do a holy mary and remove all of the limits on everything to see if that was controlling the throttle. It was! Surge is gone! Now I will start to put the limits back in one at a time to see which one is the cause. I'll post what I find as I can. By the way that tune made 466 rwhp corrected on my mustang dyne. 8 psi and everything else is stock.

Good to know
let us know what you will find
How much timing you finished with it ?

[GHuggins]

You'll probably find it to be the max torque table which usually just covers up for the driver demand tables unless you honestly had the max torque table too low.

[Mep_q8]

I've seen a lot of surge to do with Driver Demand. Get control of it, you can make a big cammed motor drive like it was a Lexus if you spend enough time tweaking it.

[DEI]

What did you find was the final cause of your surge??

[griffincox]

Bump

[str8dum1]

my bet would be overly aggressive drivers demand. I pulled 20% of my DD in my cruise range and it got rid of the TPS spikes.