Halltech

I am going to guess that the 450 estimated horsepower to be way under-estimated. It would be impossible for a DI high compression motor to make only 14 more horsepower with the same c.i.d. unless the entire motor was de-tuned with the cam profile, and ECU tuning.

Here is why:

The horsepower should be at least 54 more (490) than the C6 LS3, since the 11.5:1 CR coupled with DI should net 6.8 more hp/cylinder. I could be wrong, but the LT1 would have to be detuned to make only 14 more than the LS3. We will know soon. Why do I think that DI will make more power? "Cadillac sells the CTS with both indirect and direct injection versions of its 3.6 liter V6 engine. The indirect engine produces 263 horsepower and 253 lb-ft of torque, while the direct version develops 304 hp and 274 lb-ft." which is 6.8 more Hp/cyl. on their 6 cylinder motor.

Read this article on what DI should bring to the table. This increase assumes the higher compression ratio vs. non DI versions of the Cadillac motor.



We'll see.

Raitzi

It would be very ugly if they are planning to make Z06 with ECU update and intake change Thankfully lot mags do dyno on cars they test and we will find out.

Z06Norway

Valid and good point, and i sure hope you are right

IF C7 can run E85 with a computer that can change programming accordingly, with 11.5 static Compression, shouldn't it make even more Hp ?


Rune

Halltech

Once the SAE J1349 Certified dyno results are announced we will know for sure.

As I indicated, there is almost no way to not add 15% more power to the previous platform. The compression ratio alone would bring 10 more horsepower, but without DI, would create a problem for the CA SMOG machines, since 91 Octane will not tolerate 11.5:1 CR. It will with DI.

I already know what the Z06 version will be and your post will not be the basis for the motor.

One interesting thing that could be on the horizon is FF for the Z06. Imagine that with DI.

VinceJB

I said close to 500 hp and I am sticking with that number.

RocketGuy3

15% seems unlikely. I'm guessing it will be around 10%, which is mostly ok by me.

We're starting to run into the law of diminishing returns with power. It's not going to keep increasing forever at the same rate with every new generation. Before long, even the base model will have power that's unusable in 98% of driving scenarios.

BeaZt

Jim, do tell!

Raitzi

I am glad to be wrong

Halltech

Flex Fuel would be a great improvement, but for some unknown reason, GM has not introduced alky to the Corvette platform. I have a 770 HP CTS-V motor running 15PSI boost with E85, but I had to reflash the stoichiometric values to 9.85:1 and OL to 8.5:1 15 PSI with a static 9:1 CR equals 18.18:1 compression ratio. E85 has an Octane rating of 105, which allows much higher CRs.

bcmarly

Throw us a bone, come on Jim.

adamgl

Well what is it? Inquiring minds want to know, lol. Same 6.2L DI with supercharger?

Aozora

Maybe the OP is right and GM really believes the ECU is uncrackable and plan to offer their own tune for X price or Possibly as part of a 'performance package'.

Shurshot

I agree with the OP assessment and have taken that position ever since the LT1 was announced,

Any HP changes due to E85 being used would be IMO on top of the OP estimates

On the other hand and as already posted, with things the way they are if GM was to introduce a higher priced model such as a ZO6 with only an ECU change, I would be disappointed enough to switch brands (after 35 year loyalty) even if it meant settling for a less desirable car

tuxnharley

Perhaps deliberately under rated? IIRC, GM did that a few times in a previous generation of Sting Rays............ Maybe yet another link to Corvette heritage?

Halltech

Except that 7hp/cyl increase has been touted as the minimum increase with DI by GM.

Halltech

I believe they want the Corvette world to be stunned by the actual J1349 SAE dyno ratings when they come out. I say 490 HP minimum.

BeaZt

I guessed 497 awhile ago

BeaZt

Oh yeah nice way to blow off out Z06 questions. Lol...jk

tuxnharley

At that level I could even learn to ignore the rear end styling.............

Halltech

The ECM will use a public key encryption to prevent tampering. It may take some time for the "tuners" to crack it, if ever.

This is why we are purchasing a C7. When we build our intake, it will be tested for 5,000 miles on several C7s, to assure no codes, or problems.
We are also applying for CARB certification, which may be easier to obtain without the hydrocarbon pad issue that GM had problems with in 2006. There will be no intakes that say TUNING REQUIRED, since those days will be long gone with this new ECM.

We worked with CARB for over a year on getting an EO number, but in the end, the GM hydrocarbon pad releasing inside the OE intake, became a big problem for all applicants, which finally scrubbed all efforts at CARB cerification.