I assume that the 460 figure GM give is for 91 with ethanol. what is the effect of better gas?

 

A couple of percent maybe but its not worth worrying about. Id run 85% ethanol if I could.

 

GM has changed the STOICH valve of 14.68 for gas in the Corvette for the 1st time---It is now a richer 14.10---They did NOT do this on other GM DI engines like the Silverado--
Their reasoning was to anticipate for Ethanol infused gas or crappy Calif 91 octane gas
The DI engines seem to be very sensitive when it comes to OCT and Ethonal content
Using 93 octane fuel or race gas that has NO Ethanol would be a good idea on previous port injected engines----However the NEW E92 computer on the 2014 DI engines already make all these adjustments for you---It's the beauty of the New DI system----The ECM if re-tuned will make the most HP it can with the fuel that's in the tank--You don't have to mess with the timing or the WOT AFR--like before--All you have to do is "ask" for more HP in your tune and the ECM will try to make it with the gas you have--Within pre-set GM configured safe parameters---Bottom line---They have already taken cheap gas into the mix--and there is not much there by running race gas or hi Oct fuel--This is based on a D/D type car--sure a race car the rules change when you want all out HP all the time--but 95% of the cars out there--best is to do something else to add HP----Just my opinion as a tuner and an owner of a C7

 

more bad information.

the LT1 will run a lot more timing. just because you don't know what to change in the tune to allow it without knock doesn't mean it doesn't need it or can't use it.....these engines need certain changes almost in line with tuning a diesel to make power, if you change one thing you need to change corresponding other things. no longer can you adjust spark timing and fueling independently. learn more, then post. and stop using EFI Live.

btw, most of the trucks are flex fuel so of course they don't run 14.1 all the time.

 

Hilarious !!!! Gas Stoich on Silverado's is 14.68 and on a Corvette 14.10-- PERIOD----No one said anything about a flex fuel car---I can tell your opinion is based on never looking at an E92 tune before
Talk to any major tuner or software educator about tuning an E92 and they will tell you the same thing as I mentioned----The hi oct table is an C7 at WOT is about 18* but the "max brake TQ timing is as high as 21* which means the ECM will automatically add more timing if you ask for more TQ---
I have read where tuners have experimented with previous tuning practices on an E92 and have blown or ruined the engines on the
dyno-----Informed tuners have learned that not to tune that way anymore---
Common sense simply says---These engines have a lot more compression and the characteristics of DI engines don't require excessive timing----That being said--Run as much as you want and good luck !!! Also these engines can run on their own as lean as 13.1 at WOT----and you want to ADD more timing ??--All that will happen is that the ECM will RICHEN up the fuel and you will have a wash---with the added chance of detonation---------
Bad information ??? No--- you are giving bad advice---
Can really tell you are simply an HP advocate and have never had anything good to say about EFILIVE---or it's training

 

you really have no idea what you are talking about, sorry bro. you may have explored your E92 a little bit with EFI Live, which is always behind the curve and results in you also giving behind the curve information but I have tuned several manual and auto E92s and hundreds of Camaros, Vettes, and trucks over the last 10 years. how about you?

i will take you to school every time, the only issue is, most of your posts warrant no response. i can't spend all my time addressing literally every sentence you write (which would be required).

 

While I agree EFI Live is behind on the E92, its hard to say that about any of the other controllers. I actually prefer it on certain ECU's just because of the VVE and it allows my WB to come in serial.

Does the C7 even have flex fuel on board. I don't remember seeing anything about it and I have never tried it in ours. Also by the way GM doesn't do any of the SAE procedures on regular fuel, it is all done on a 100 octane iso octane test fuel.

 

I agree, efi live is great for diesels, they are ahead of HPT there. however, I love to give tblu a hard time about it.

the C7 is not flex fuel ready out of the box. I have not seen a modern silverado, which is a tblu assertion, without flex fuel ready. his comment stating gm uses 14.1 in stoich table (to manage fuel trims) on the C7 but not trucks is silly because trucks use a variable stoich table from 0-80 or 0-100 ethanol % depending on the OS. so he will never see 14.1 across the board on a truck, they are flex fuel ready. I love how that went completely over his head but he still wants to argue about it.

and yes, I know gm uses a standardized fuel, I didn't make the statement they use 14.1 E10, tblu did. actually he said they used 14.1 to anticipate California 91 octane.

 

Guess I got lost in you all going back and forth. EFI Live does a better job on the E38 and E67 as well. Honestly I think it is insane to have to go back and forth between two different programs, I use both depending on what I am calibrating. I like the VVE table, cax tables, and the scanner is more powerful but absolutely not user friendly. HP Tuners kills them in the ease to use on setup in the scanner side. The Pros and cons to both, but HP you really do themselves a favor by adding some options to their software. Actually if everyone looked at Vision and did something similar that would really be great.

 

 

100's of E92's when they've only been out for 1 year--Sorry "BRO' you are NOT my bro by the way--You are DEAD wrong and misinformed----You o say you know about E92's but you didn't even know that a C7 has a stoich of 14.10----
You have think you know but you have HP which is an inferior software system that interprets GM computers to suit themselves--and they are NOT accurate----
Simple test is to command 22* timing at WOT but if you'll see even more actual timing by simply increasing the TQ response table---This shows you that the timing table changes don't matter as these new ECM's make all the changes for you
You can change all the timing you like and alter the AFR at WOT at your hearts desire--but the TQ response table in the E92 ECM rules
YOU are stuck in dinosaur tuning practices not me----
Do whatever you like--and good luck to your customers---
I'm not going to respond to you anymore---and nit going to explore my credentials with you readers can deem who they choose to believe
Do you even own a new C7 ? that you have been able to test your old tuning practices ? I have had my C7 on the dyno over 20 times before I ever tuned an E92 and have data logged proof that I am correct------The end---

PS: I have tuned over 2000 GM cars and trks including about 500 Duramax diesels 20 of them being LML's---I went to EFILIVE training and am a protégé of the best tuner which I believe is in the US Jesse Bubb----and He trained me on how to tune E92's

 

now we know why you like efilive. you're a diesel guy.
and you still have a lot to learn, it seems.

where are you getting that "I didn't know the C7 had a stoich of 14.1?". show me what led you to that brilliant conclusion.

I can quote you recommending people do some pretty stupid things at the track, quote you incorrectly describing many things about the C7 tune, and more.

you think just because an ECM uses torque control systems that spark timing no longer matters? too funny. sounds like you are bewildered.

the point is, you give bad advice (and your posts are very hard to read). look into paragraphs and sentence structure.

either way, since you won't be responding, I won't expect a response....have a great day, bro.