C7 Tuning, help with header tune!
Thread Starter
Instructor
Joined: May 2015
Posts: 189
Likes: 36
C7 Tuning, help with header tune!
Greetings,
I've got a 2015 Z51 A8 with MRC. I just ordered a set of the Texas Speed Longtubes and non-catted x-pipe. I know that I need a tune to shut the CEL off. My problem, and the question for you all, is that I do not live anywhere close to a dyno or anyone that can tune. I talked with Diablo support today and they said I can't just shut the rear O2 sensors off with their handheld tuner. I am wondering how to go about getting a tune put on the car (hopefully one that will take advantage of the headers and tune accordingly) so that I don't have any CEL. Also, it is imperative that I'm able to reflash my stock tune back to the car for warranty issues and have it be undetectable. I was told to have Diablew make me a tune. Seems silly to buy a Diablo tuner just to upload a tune from someone else. Essentially, I'd be paying nearly $500 to interface with the car and another ~$150 for the tune. Any ideas?
Also, do the tunes affect all driving modes equally? It would be nice to have the tune apply only to track mode, and have it drive stock in the other modes. Anyone know how the tune interfaces with all the different driving modes? Any help is appreciated!
I've got a 2015 Z51 A8 with MRC. I just ordered a set of the Texas Speed Longtubes and non-catted x-pipe. I know that I need a tune to shut the CEL off. My problem, and the question for you all, is that I do not live anywhere close to a dyno or anyone that can tune. I talked with Diablo support today and they said I can't just shut the rear O2 sensors off with their handheld tuner. I am wondering how to go about getting a tune put on the car (hopefully one that will take advantage of the headers and tune accordingly) so that I don't have any CEL. Also, it is imperative that I'm able to reflash my stock tune back to the car for warranty issues and have it be undetectable. I was told to have Diablew make me a tune. Seems silly to buy a Diablo tuner just to upload a tune from someone else. Essentially, I'd be paying nearly $500 to interface with the car and another ~$150 for the tune. Any ideas?
Also, do the tunes affect all driving modes equally? It would be nice to have the tune apply only to track mode, and have it drive stock in the other modes. Anyone know how the tune interfaces with all the different driving modes? Any help is appreciated!
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
As an EFILIVE commercial tuner the latest update they had (april 2015) still says they have no idea which of the TQ response tables are matched to the 5 different driving modes
Without tuning you will see some HP increase-- maybe 10-12---However to get the full benefit of the LT's a custom tune may result in 25 RWHP gains
Even though Diablo is the king of the handhelds there is no way you can achieve optimum HP without having the car in the shop
There are too many tables that LT's can affect to get max HP without having the car
Depends on your goals---Max HP or simply more HP--
Also very important recently Diablo has concurred that an AFE cold air intake requires a special tune---So if you have one of them you will need a tune that addresses that mod
specifically----Diablo can get your tune very close-- the more info you can give them concerning your mods the closer they can get it--But as I mentioned they never have the car so a custom tune is the only way to get MAX HP and to address any drivability issues
Without tuning you will see some HP increase-- maybe 10-12---However to get the full benefit of the LT's a custom tune may result in 25 RWHP gains
Even though Diablo is the king of the handhelds there is no way you can achieve optimum HP without having the car in the shop
There are too many tables that LT's can affect to get max HP without having the car
Depends on your goals---Max HP or simply more HP--
Also very important recently Diablo has concurred that an AFE cold air intake requires a special tune---So if you have one of them you will need a tune that addresses that mod
specifically----Diablo can get your tune very close-- the more info you can give them concerning your mods the closer they can get it--But as I mentioned they never have the car so a custom tune is the only way to get MAX HP and to address any drivability issues
Pro
Joined: Jan 2015
Posts: 629
Likes: 6
From: North New Jersey
with tblu For many it comes down to tuning the machine versus tuning the machine plus drivability.
More hp is great but without proper street manners it's more of a hassle and could lead to other issues.
Better to establish a relationship with a reputable tuner now and have fun from there knowing you will get the most from your mods
Drifting
Joined: Jun 2007
Posts: 1,577
Likes: 295
From: Overland Park KS
This is a good question for the Diablo Sport guys. I always assumed the Diablo tunes affect all driving modes similarly, but I guess I never saw that in writing.
Thread Starter
Instructor
Joined: May 2015
Posts: 189
Likes: 36
Trifecta Tune
I think that I actually decided on the Trifecta tune. Do you know if it changes things based on the mode? I.E. could I have tour be a completely stock driving experience (DOD on, exhaust closed, etc., etc.) and Sport be entirely different? Or does changing an option change it in all modes? I e-mailed them for a demo tune.
Lance, I live in Wyoming (most people just call it BFE
LT1_E85_Corvette, What kind of power were you making on the E85 tune with headers? And it was a Trifecta tune? How did you like that tune? and the 93 tune?
Headers should be here Friday....getting pumped!
Lance, I live in Wyoming (most people just call it BFE
LT1_E85_Corvette, What kind of power were you making on the E85 tune with headers? And it was a Trifecta tune? How did you like that tune? and the 93 tune?
Headers should be here Friday....getting pumped!
Thread Starter
Instructor
Joined: May 2015
Posts: 189
Likes: 36
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Pro
Joined: Jan 2013
Posts: 567
Likes: 28
From: Arizona
I installed the Trifecta tuning in my C7 A8 with NPP. The only mod is an Air-Raid drop-in (dry) air filter.
The Trifecta tune re-calibrates the ECM and TCM and the way they interact. The torque converter slip is also adjusted.
Trifecta claims a gain of 31 ft-lbs at 3550 rpm, and sure feels like it to me.
I exercised the option to disable the AFM, glad I did. (Not sure if Trifecta can retain the AFM in Eco mode only).
Trifecta also increased throttle response and the way the car shifts is amazing.
Sport and Touring mode are now distinctly different.
I won't return to the stock tune.
The car now operates and performs like I envisioned.
Go to the website above and contact Trifecta from there.
Last edited by marcouvo; Jul 23, 2015 at 08:26 PM. Reason: retain, not disable, AFM in Eco Mode
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
The TCM and ECM are 2 separate computers---I think what you are feeling is an adjustment to the "TQ response tables" in the ECM files These E92 ECM's are like none ever before from GM---basically now all you have to do is "ask" for more TQ at a certain speed and throttle position and the ECM will try to achieve it on it's own Not like before where you had to increase timing and alter WOT fuel--The E92 does all this for you--added TQ may be gained via the clutch to clutch converter--but there are no tables in the TCM that address this--it is all controlled by ECM tuning
Pro
Joined: Jan 2013
Posts: 567
Likes: 28
From: Arizona
The TCM and ECM are 2 separate computers---I think what you are feeling is an adjustment to the "TQ response tables" in the ECM files These E92 ECM's are like none ever before from GM---basically now all you have to do is "ask" for more TQ at a certain speed and throttle position and the ECM will try to achieve it on it's own Not like before where you had to increase timing and alter WOT fuel--The E92 does all this for you--added TQ may be gained via the clutch to clutch converter--but there are no tables in the TCM that address this--it is all controlled by ECM tuning
From the Trifecta presentation:
TRIFECTA presents a complete powertrain power delivery profile recalibration for the MY2015 Chevrolet Corvette / Corvette Z51 engine and corresponding 8L90 automatic transmission reprogramming. The TRIFECTA Performance Chevrolet Corvette C7 LT1 6.2L and Corvette C7 Z51 LT1 6.2L MY2015+ powertrain calibration is an easy to install software performance recalibration with an included flash loader device that will yield specific gains of +31 ft-lbs @3550ation. RPM and +24 WHP @5575 RPM (Peak gains of +26 ft-lbs and +22 WHP) to a completely stock Chevrolet Corvette LT1 6.2 MY2015 vehicle.
Melting Slicks
Joined: May 2014
Posts: 2,611
Likes: 89
As an EFILIVE commercial tuner the latest update they had (april 2015) still says they have no idea which of the TQ response tables are matched to the 5 different driving modes
Without tuning you will see some HP increase-- maybe 10-12---However to get the full benefit of the LT's a custom tune may result in 25 RWHP gains
Even though Diablo is the king of the handhelds there is no way you can achieve optimum HP without having the car in the shop
There are too many tables that LT's can affect to get max HP without having the car
Depends on your goals---Max HP or simply more HP--
Also very important recently Diablo has concurred that an AFE cold air intake requires a special tune---So if you have one of them you will need a tune that addresses that mod
specifically----Diablo can get your tune very close-- the more info you can give them concerning your mods the closer they can get it--But as I mentioned they never have the car so a custom tune is the only way to get MAX HP and to address any drivability issues
Without tuning you will see some HP increase-- maybe 10-12---However to get the full benefit of the LT's a custom tune may result in 25 RWHP gains
Even though Diablo is the king of the handhelds there is no way you can achieve optimum HP without having the car in the shop
There are too many tables that LT's can affect to get max HP without having the car
Depends on your goals---Max HP or simply more HP--
Also very important recently Diablo has concurred that an AFE cold air intake requires a special tune---So if you have one of them you will need a tune that addresses that mod
specifically----Diablo can get your tune very close-- the more info you can give them concerning your mods the closer they can get it--But as I mentioned they never have the car so a custom tune is the only way to get MAX HP and to address any drivability issues
Burning Brakes
Joined: Jul 2000
Posts: 761
Likes: 0
From: Tucson AZ
Tune out the CEL yourself.
If the rear O2's never get a "reading"....the CEL O2 sensor faulty code will not show up. Remove your rear O2 sensors and sleeve over them with a brass tube (cut to length) from the K&S metals display at Ace Hardware or local hobby shop. The tube will clear the threads and just re-install. You may need the next oversize from the sensor's vane diameter.....just split the tube and compress with your fingers so you get some spring tension grip on the sensor. Be sure the split faces downstream when you draw them tight in the bung. http://www.ksmetals.com/26.html
Last edited by longboy4; Jul 26, 2015 at 02:57 AM.
Burning Brakes
Joined: Jul 2000
Posts: 761
Likes: 0
From: Tucson AZ
Thread Starter
Instructor
Joined: May 2015
Posts: 189
Likes: 36
CEL Codes
Ok, so I've got the headers and the Trifecta tune. Does anyone know which code (s) to disable in their software to prevent the lack of rear O2 sensors from triggering a CEL?
I got answers for some of my previous questions if you're interested: The exhaust modes still work as default (you can even still change them in the radio). The AFM is deactivated in all modes. My guess is that there are no modifications to suspension, steering, etc. with the tune. It affects only transmission and engine computers.
I got answers for some of my previous questions if you're interested: The exhaust modes still work as default (you can even still change them in the radio). The AFM is deactivated in all modes. My guess is that there are no modifications to suspension, steering, etc. with the tune. It affects only transmission and engine computers.
