Current C7 Z06. Had a Mantic twin in it, its done. Installing a Mantic Tripple. But few questions (Tripple vs twin ads back another 8 lbs of rotating mass so may help some too)

I revs great BUT, it also Un-revs so fast if your using Rev matching with down shifts it will rev 2 times like, Blurp to RPM and then it will do it again if our not real fast to bring it back up to RPM.

Also its is a pain to take off from red light. I have had ALOT of heads, cam, blower, clutch sets ups. This is my 12th modded C5/C6/C7. I have had some tricky super light Spec / Puck set ups back in the day in F bodies too. So I aware it can be nature of the beast and all, but this seems more of a rare something needs to be adjusted to make it right. not just deal with it problem. Everyone seems to Love the way Mantic clutch's drive, and I have searched and searched and can't find post with these issues with that clutch. I did find where KaTeck posted this about there light flywheel "Since the throttle control is now all torque-based when you change the clutch/flywheel mass you're changing the required torque to keep the engine running. This requires manipulation of these tables to get it to idle correctly, decelerate without stalling, etc."

So anyone in the tuning world have any info on this? This Particular car was Remote tuned by Ryne Cunningham. So maybe drivability/ this was not addressed just normal stuff for Cam/DOD and Power enrichment mode ect.

Thoughts?

 

You need to change the Virtual Torque tables on the Airmass and MAP side. In addition, the External Load table usually needs tweaking as does the Adaptive Idle Speed Control, both Immediate and Predicted.

Of course this assumes the rest of the tune is squared away.

I went through this with my RPS twin w/ aluminum flywheel....19lbs vs OEM >60lbs...and the above is how I dialed it in.

 

awesome info/ response. Any details as to how much or what you changed A to B would be great. I have a trusted tuner locally I always use to check & tweak cars. But always good to go with info in hand.

from what I have found stock flywheel + clutch is 66lbs
Mantic flywheel + twin clutch is 42 lbs total (33% lighter)
Mantic Flywheel + tripple = 50 lbs total (20% lighter)

 

TLDR: It's not quite that simple. Not being able to see the tune that's in there now, it may only need a minor tweak or two or it could need a wholesale revision.

Longer....
I will say that increasing the left side of the Immediate table (ie instead of -25 going to -35 for instance) should slow the throttle return when you let off the gas. Too much of a good thing and the throttle will hang.

In the Virtual Torque (VT) tables you'll want to look in the ~1800 rpm range and surrounding areas. You also have to know via data log what timing is being used by the car. There's not just a single table. They go from -10* advance to +40* A snippet of mine....


Frankly, although the setup you have is lighter than stock....It's not that much lighter. 16lbs is pretty minor. For sake of caparison, mine is 47lbs lighter.

It makes me wonder if they need to move the Adaptive Idle tables back closer to stock. This is speculative without a log and seeing the tune. Driveability takes some time and the more mods the more time it takes. WOT is the easy part.

To give you an idea of how things can vary (or not), even in stock cars, below are the Adaptive Idle Immediate Speed Control tables

Stock 2019 Grand Sport


Stock 2019 ZR1



Cars you'd think would be similar to the ZR1 are instead identical to the 2019 GS. 2022 Camaro ZL1 is the first table and a 2019 Z06 is the second one....





Here's what's in my car currently....

 

Awesome info and post! thank you again.

I do hope the tripples extra 8 lbs help it. TIme will tell then will play with the tune. I do know it does take off better cold/ Open loop.

 

YW.

If you want, tell your tuner you want a copy of the tune. If he gives it to you, you can PM me and I can take a copy and do a "compare" in order to tell you where the changes are.

Obviously totally up to you if you want to do that or not.

 

I don't know much, but I do know that is true!!