Dyno Tuned

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Oct 1, 2013 | 07:02 PM

#21

tail_lights

Race Director

Joined: Apr 2009

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From: SE TEX

Quote:

Originally Posted by rcallen484

You are but that is obviously your nature. Do your best with the way you are.

I'll try. Just not happy with what GM gave us for the base/Z51 C7.

Quote:

Originally Posted by rcallen484

Who drank half my water???

Last edited by tail_lights; Oct 1, 2013 at 07:04 PM.

Oct 1, 2013 | 07:04 PM

#22

C7lover2

Intermediate

Joined: Jan 2013

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any plans to add some E85 and a retune? Wondering how the fuel system will handle E85 stock. How are the injector duty cycle's after a tune?

Oct 1, 2013 | 07:04 PM

#23

timmyZ06

Le Mans Master

Joined: Jul 2010

Posts: 5,407

Likes: 265

From: montreal quebec

damn you beat me to it

what's up with the supercharge/TT tables that sound VERY promising!! Where did gain the most? Is the timing or the fuel was very conservative? Is there room for E85?

Oct 1, 2013 | 07:05 PM

#24

tail_lights

Race Director

Joined: Apr 2009

Posts: 10,581

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From: SE TEX

Quote:

Originally Posted by C7lover2

any plans to add some E85 and a retune? Wondering how the fuel system will handle E85 stock. How are the injector duty cycle's after a tune?

Ahh, that's a good question

Oct 1, 2013 | 07:10 PM

#25

C7lover2

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I live in So Cal the land of 91 octane (Aka ****). I love running E85 in all my cars! E85 is liquid gold in my eyes.

Oct 1, 2013 | 07:11 PM

#26

rcallen484

Race Director

Joined: Dec 2011

Posts: 10,355

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Quote:

Originally Posted by tail_lights

I'll try. Just not happy with what GM gave us for the base/Z51 C7.

Who drank half my water???

Water...?

Oct 1, 2013 | 07:14 PM

#27

OnPoint

The Consigliere

Joined: May 2006

Posts: 22,991

Likes: 6,034

From: 2023 Z06 & 2010 ZR1

Any more info on FI tables?

Oct 1, 2013 | 07:17 PM

#28

tail_lights

Race Director

Joined: Apr 2009

Posts: 10,581

Likes: 252

From: SE TEX

Quote:

Originally Posted by rcallen484

Water...?

Nice!

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Oct 1, 2013 | 07:27 PM

#29

NoOne

Team Owner

Joined: May 1999

Posts: 34,551

Likes: 505

From: Auburn Hills MI

Quote:

Originally Posted by tail_lights

Maybe I'm a "negative nancy", but GM should have just given us better numbers to begin with.

What this post implies is that they are holding back with their 460 horses like many of us thought.

Because tuners like 21st Century can do as they please without the EPA looking over their backs.

Oct 1, 2013 | 07:43 PM

#30

Raced Guy

Racer

Joined: Mar 2005

Posts: 416

Likes: 27

From: Roberts WI

What were the gains below the curve ? Looks like strong gains from 4k to 5k !!!

Oct 1, 2013 | 07:49 PM

#31

21STCENTURYMUSCLECAR

Thread Starter

Premium Supporting Vendor

Joined: Aug 2002

Posts: 1,581

Likes: 43

From: Addison TX

Quote:

Originally Posted by OnPoint

Any more info on FI tables?

I will post up some screen shots tomorrow

Oct 1, 2013 | 07:53 PM

#32

21STCENTURYMUSCLECAR

Thread Starter

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Joined: Aug 2002

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From: Addison TX

Quote:

Originally Posted by C7lover2

any plans to add some E85 and a retune? Wondering how the fuel system will handle E85 stock. How are the injector duty cycle's after a tune?

You wouldn't believe me if I told you..........

19

See......
There goes my injector sales!

Best Regards,
John Page

Oct 1, 2013 | 08:08 PM

#33

tail_lights

Race Director

Joined: Apr 2009

Posts: 10,581

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From: SE TEX

Quote:

Originally Posted by NoOne

Because tuners like 21st Century can do as they please without the EPA looking over their backs.

I seriously doubt a better tune to pick up a few ponies up top will hurt MPGs, shoot, I bet the 21st Century tune gets better that stock MPG

Edit:
I guess I should say I'm sure a company as big as GM could find a way to put a better tune to pick up a few ponies up top without hurting MPGs. They just didn't want to.... YET....

Last edited by tail_lights; Oct 1, 2013 at 08:10 PM.

Oct 1, 2013 | 08:27 PM

#34

C7lover2

Intermediate

Joined: Jan 2013

Posts: 28

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Only 19 percent? Wow they left some crazy room in the injectors if the number you provided is percent based. Wonder what the limitations of the fuel pump will be. Never replied with any info on the E85 tune ! Any plans or not your cup of tea? Thanks for your input by the way. Very exciting stuff and I look forward to the future of this vehicle.

Oct 1, 2013 | 08:33 PM

#35

C7lover2

Intermediate

Joined: Jan 2013

Posts: 28

Likes: 0

Quote:

Originally Posted by tail_lights

I seriously doubt a better tune to pick up a few ponies up top will hurt MPGs, shoot, I bet the 21st Century tune gets better that stock MPG

Edit:
I guess I should say I'm sure a company as big as GM could find a way to put a better tune to pick up a few ponies up top without hurting MPGs. They just didn't want to.... YET....

I'm sure they could have found more power but keep in mind that all engines are not built equally nor will they dyno exactly the same. Gm has to leave room and a safety margin for fuel grade, weather and other factors. That's the beauty of a custom tune you are able to push the vehicle further and determine your specific engines limitations (knock, fuel spray pattern, cylinder diferrences and many other factors) to achieve optimal performance.

Oct 1, 2013 | 08:47 PM

#36

FastMatt2

Burning Brakes

Joined: Dec 2001

Posts: 774

Likes: 4

From: alamogordo nm

Quote:

Originally Posted by 21STCENTURYMUSCLECAR

You wouldn't believe me if I told you..........

19

See......
There goes my injector sales!

Best Regards,
John Page

GM seems to be going way over board with injectors on there DI motors. The injectors that come stock in the 2.0L turbo ATS that put about 220 hp to the wheels stock threw a auto have already been pushed to nearly 500 whp and there still not even close to maxed out.

Oct 1, 2013 | 09:17 PM

#37

keagan

Melting Slicks

Joined: Jul 2004

Posts: 3,384

Likes: 993

Nice numbers for tune only, looking foward to seeing what's up with the TT and Supercharger.

Oct 1, 2013 | 09:49 PM

#38

arghx7

Intermediate

Joined: Jul 2013

Posts: 43

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Quote:

Originally Posted by 21STCENTURYMUSCLECAR

You wouldn't believe me if I told you.........
19

Quote:

Originally Posted by C7lover2

Only 19 percent? Wow they left some crazy room in the injectors if the number you provided is percent based. Wonder what the limitations of the fuel pump will be.

DI engines are not like PFI. You can't really go by injector duty cycle. You have to look at the start of injection and end of injection timing as well as the rail pressure. On most engines, any SOI before 340BTDC firing and EOI after 50BTDC firing will have smoke and oil dilution. This is because the fuel hits the piston or cylinder wall.

Call it 19 percent if you want, but that's thinking in PFI terms really. On a PFI engine, you tune the injection timing first by the end of injection. It's either open valve or closed valve injection. Typically full load is open valve, and if you fully max the injectors out they keep spraying on the back of the valve all through the 4 strokes.

Quote:

Originally Posted by FastMatt2

Again, they will max out if you care about fuel impingement, oil dilution, and throwing fuel out of the exhaust valve. Which, I admit, nobody here cares about that much.

But to say GM left a bunch of headroom is simply not getting into their mindset and not understanding how DI engines are designed. Injection timing, rail pressure, and number of injections are all important factors, and they can affect horsepower.

Oct 1, 2013 | 10:27 PM

#39

Racer X

Le Mans Master

Joined: Jul 2000

Posts: 6,559

Likes: 4,501

From: North Dallas 40 TX

Quote:

Originally Posted by 1320vetteran

Where? I'd like to read it. Tried sending you a PM.

http://forums.corvetteforum.com/c7-g...lable-now.html

It is worth downloading and strolling through the Corvette file in Demo mode. If you are into the technical details.