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Tuning a stock car, worth it?

 
Old 02-15-2019, 10:54 AM
  #21  
KingCorvette93
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Originally Posted by CrystalRedTed View Post
Of course there are software power limits given the general nature of the question. There is a great deal of software in these cars. One can argue that traction and stability control is a type of software power limit. Redline cut is a form of software power limit. Timing adjustments based on conditions could be argued the same. What's underlying your concern about power limits?

I know of European cars that are significantly power limited in first and second gear (torque limited to be more specific). After a tune they can still end up with the same limits, which means the tune only does something when you hit third gear. If that's your concern I don't see anything like this going on in the C6 M6 cars.

Sure, I'll be more specific. I read through the grapevine of threads out there that HP and or TQ is limited to 380 in first and second gears. True or no?

Last edited by KingCorvette93; 02-15-2019 at 10:55 AM.
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Old 02-15-2019, 12:45 PM
  #22  
RogerRamjet21
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The previous owner of my 2008 Base model had the car dyno tuned with only a CAI. He said it gained 40hp. While I have no way to verify that, I drove 3 2008 base models and 1 2007 ZO6 before purchasing this car and this car felt closer to the Z06 than the other base models. He also had the CAGS (Skip shift) disabled in the tune which I love (I consider the skip shift to be dangerous and also eliminated in when I owned my 94 Firebird Formula M6).
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Old 02-15-2019, 06:57 PM
  #23  
CrystalRedTed
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Originally Posted by KingCorvette93 View Post
Sure, I'll be more specific. I read through the grapevine of threads out there that HP and or TQ is limited to 380 in first and second gears. True or no?
Hopefully one of the tuners will respond to provide a definitive answer. Or give them a call. Normally this sort of limit is expressed as a torque limit vs horsepower. Iíd also expect it to be more related to automatic transmission cars. If itís happening on the M6 I certainly canít feel it.
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Old 02-15-2019, 07:01 PM
  #24  
CrystalRedTed
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Originally Posted by RogerRamjet21 View Post
The previous owner of my 2008 Base model had the car dyno tuned with only a CAI. He said it gained 40hp. While I have no way to verify that, I drove 3 2008 base models and 1 2007 ZO6 before purchasing this car and this car felt closer to the Z06 than the other base models. He also had the CAGS (Skip shift) disabled in the tune which I love (I consider the skip shift to be dangerous and also eliminated in when I owned my 94 Firebird Formula M6).
i can believe that especially with gearing of the Z51. At least at up to legal speeds anyway.
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Old 02-16-2019, 01:39 PM
  #25  
KingCorvette93
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Originally Posted by CrystalRedTed View Post
Hopefully one of the tuners will respond to provide a definitive answer. Or give them a call. Normally this sort of limit is expressed as a torque limit vs horsepower. Iíd also expect it to be more related to automatic transmission cars. If itís happening on the M6 I certainly canít feel it.
Conjecture at this point... I just read it in a thread somewhere...

Let's see what tuners say! I sent an email to one.
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Old 02-16-2019, 02:00 PM
  #26  
sfrank2886
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Originally Posted by Boostedsvt View Post
08 manual trans, completely stock down to the paper air filter. Would It be worth it to get a custom tune? Did GM leave some power or responsiveness on the table?
Yes a tune will help. Consider adding a CAI and tune from Diablo. I started with a 93 octane tune and turned off torque management and speed limiters. The throttle response and driveability where greatly improved. After I added headers, I then went with the Full Tune from 21st Century. More improvements in throttle response, power and trans shifting.

ps I have a DiabloSport Intune i2 if you are interested as I no longer need it with the full tune.
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Old 02-16-2019, 03:23 PM
  #27  
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Originally Posted by KingCorvette93 View Post
Sure, I'll be more specific. I read through the grapevine of threads out there that HP and or TQ is limited to 380 in first and second gears. True or no?
Yes, TM can be adjusted via max to drive line for over all limits, max per gear/rms, and even TB/ECT.

So if you want to hold instant powder back per gears, then that would be done in the TM max torque RPM verse gear tables. If you want to hold power back via throttle, then that would be done in ETC tps max limit tables.


As for tune, all the Torque management limits are raised so the engine is allows to put max instant torque/power to the wheels at any given time (engine de-hobbled), and why the seat of pants feeling is increased so much with a tune, although you may only be picking up 15hp isntead.


The second part of a good tune is throttle mapping. Hence when you have your foot half way down on the throttle pedal with the stock tune, the Throttle body is not opened 50%, but only about 15% open instead. Its not until you have the throttle pedal down about 80%, that the TB vain starts to open up to about 80% isntead.
As for throttle pedal to TB vain linear in their rates, mapping such would have the car almost un-drivable.

So stock maps in green and purple depending on what mode the car is in, and somewhere around red is the target for the new mapping, depending on the drivers skill level.
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Old 02-16-2019, 04:37 PM
  #28  
sfrank2886
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My set up 08 base (CAI, headers,TRX plugs, wires, tune), put down 412 RWHP, a bit more than a seat of the pants feeling HAHA

Its a good base start for me, and I would say others just wanting a bit more performance. Now I can work on the driver MOD because the car is better than most peoples driving skills.

Good Luck with your decision!
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Old 02-16-2019, 07:23 PM
  #29  
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I had my stock LS3 tuned twice. The first was in conjunction with an install of a Vararam intake. Dyno'd at 411hp at the wheels with the intake. I like the intake and definitely got a seat-of-the-pants kick from it - especially at speed where the ram air design was most effective. However, I got a bit worried about the whole water ingestion issue, particularly after getting stuck in a couple of heavy downpours that created some big puddles and subsequently some relatively dangerous evasive maneuvers. I decided ultimately the risk wasn't worth the gain even if it is a very rare occurrence. So I had the intake removed, the stock shroud put back in, and had the car re-tuned. I lost a few HP and some TQ, but still ended up with 404 hp at the wheels on an otherwise stock LS3. Traction continues to be the limiting factor even at this modest HP level. I had the CAGS tuned out as well. In the first tune the guy increased the idle RPM a bit and had the fans turn on a lot earlier, which I didn't like so I had him put both the idle and the fan temp parameters back to stock since I wasn't going crazy with any other mods and the things runs so cool anyway.

Overall I'm happy I did it.
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