TCM Tuning
Instructor
Joined: Mar 2023
Posts: 127
Likes: 45
Instructor
Joined: Mar 2018
Posts: 107
Likes: 34
I haven't came across that information before. If that is the case since you can tune the ecu does that allow you to shift at any rpm? I guess the next question is line pressures for that rpm to be able to adjust and what is possible atm without a full unlock.
Le Mans Master
Joined: Mar 2001
Posts: 8,423
Likes: 3,912
From: Omaha
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
I had asked once ECM tuning came out if it was possible to set a higher rev limit in manual mode and was told no, so this appears to be a new development (or I was given incorrect information before).
Drifting
Joined: Jul 2005
Posts: 1,646
Likes: 188
Again this is only in manual mode bc it’s bypasses the “shift points”.
No TCM tuning exist for these, HTG apparently has something that will work, but haven’t been able to verify. Takes 2 of there modules to control it.
I’m doing a 15 mile c8 drivetrain swap in an Ultima RS (get the chassis in 11 months) and I’m working with Hp tuners on making this swap happen. To their and my knowledge this swap hasn’t been done yet.
Instructor
Joined: Nov 2011
Posts: 127
Likes: 62
From: South FL (Fort Lauderdale)
They didn’t know what they were talking about, I can post some screen shots if you like? But the factory 6600 rpm limit can easily be raised.
Again this is only in manual mode bc it’s bypasses the “shift points”.
No TCM tuning exist for these, HTG apparently has something that will work, but haven’t been able to verify. Takes 2 of there modules to control it.
Again this is only in manual mode bc it’s bypasses the “shift points”.
No TCM tuning exist for these, HTG apparently has something that will work, but haven’t been able to verify. Takes 2 of there modules to control it.
ps: DEFinitely keep us posted on the possible 'HTG' 2-module solution
Instructor
Joined: Nov 2011
Posts: 127
Likes: 62
From: South FL (Fort Lauderdale)
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Instructor
Joined: Nov 2011
Posts: 127
Likes: 62
From: South FL (Fort Lauderdale)
Thanks for posting! DEFinite gamechanger... I can't wait until these vendors implement this new hack onto more aggressive HEAD/CAM packages*
It's literally all the C8 really needed to take it to the next level after ECU crack.
It's literally all the C8 really needed to take it to the next level after ECU crack.
Dig
Joined: Jan 2006
Posts: 5,456
Likes: 1,119
From: Port Saint Lucie FLORIDA & HONDURAS
Incoming 416” strokers with bolt ons running 9’s will be awesome
Instructor
Joined: Nov 2011
Posts: 127
Likes: 62
From: South FL (Fort Lauderdale)
...Is anyone making a 416 kit already? I know there're a couple different 427's already..
Instructor
Joined: Nov 2011
Posts: 127
Likes: 62
From: South FL (Fort Lauderdale)
Any updates on TCU tuning? I understand they have successfully raised the rev limit to 7200 rpms and beyond now... but any higher revving aggressive cam car yet or other vendor data on any of this? 
Pro
Joined: Sep 2009
Posts: 748
Likes: 355
From: Fayetteville NC
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
There has to be more to it than just setting the engine RPMs to 7k and running in manual mode.
I set mine to 7100rpm over the weekend and put it in manual mode and it still just falls on its face at 6500rpm just like stock.
I set mine to 7100rpm over the weekend and put it in manual mode and it still just falls on its face at 6500rpm just like stock.
Instructor
Joined: Mar 2018
Posts: 107
Likes: 34
keep us updated but I think there was an hp tuners update for it not long ago so if you are on a older version it might be why. If that isn't the case we'll just let us know.
Melting Slicks
Joined: Feb 2000
Posts: 3,420
Likes: 565
From: new orleans
In stock form, the engine is designed to fall on its face at 6500, It might not have a fuel table that high up?. a cam swap will have it pull much higher. I guess the question I have is: were you able to shift at 7100?
Drifting
Joined: Aug 2022
Posts: 1,876
Likes: 782
From: Stamford, CT
The stock parts can take 7K?
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
The car has fuel system upgrades etc. so it just a matter of the tuning parameters to let it shift above the factory cutoff in manual mode.
Just raising the rev limiter alone still results in a hard cutoff in manual mode at 6500rpm is all I was saying.
EDIT: After I sent this, I opened my email and there was an email from my tuner saying that it was in the latest software update, so ChrisNC above was on the right track.
I'll give it a try this weekend.
Last edited by MCK_Z06; Feb 13, 2025 at 07:34 PM.
Instructor
Joined: Nov 2011
Posts: 127
Likes: 62
From: South FL (Fort Lauderdale)
The engine in question is an LME 700hp NA build that's designed to run over 7k rpm. The stock engine is completely out of the car.
The car has fuel system upgrades etc. so it just a matter of the tuning parameters to let it shift above the factory cutoff in manual mode.
Just raising the rev limiter alone still results in a hard cutoff in manual mode at 6500rpm is all I was saying.
EDIT: After I sent this, I opened my email and there was an email from my tuner saying that it was in the latest software update, so ChrisNC above was on the right track.
I'll give it a try this weekend.
The car has fuel system upgrades etc. so it just a matter of the tuning parameters to let it shift above the factory cutoff in manual mode.
Just raising the rev limiter alone still results in a hard cutoff in manual mode at 6500rpm is all I was saying.
EDIT: After I sent this, I opened my email and there was an email from my tuner saying that it was in the latest software update, so ChrisNC above was on the right track.
I'll give it a try this weekend.
@MCK_Z06 please keep us posted on your results!
Pro
Joined: Sep 2000
Posts: 678
Likes: 310
From: McKinney Texas
Success! It was damp and cool with traffic so I could not do much "testing".
I did a 1st gear test rolling on the throttle until 7200k and shifting but it worked.
I can hit 40mph in first vs 35mph now... lol! (Little pdr clip linked below.)
I did a 1st gear test rolling on the throttle until 7200k and shifting but it worked.
I can hit 40mph in first vs 35mph now... lol! (Little pdr clip linked below.)
