jordanC6Z06

I have a 2017 Z coming. And I've just learnt it requires 93 octane, it says right in the manual, and anything less will result in less power/possible knocking. So that means the 17's have a different tune. So the 15-16's only required 91. So my question is, besides cooler engine temps with the higher octane, what's the advantage. More crank Hp? Because I haven't seen anything advertising that and as far as I know it still makes 650/650 on 93 fuel, the same as the 15/16's but only needed 91 fuel to accomplish that...may sounds like a newbie question but I'm trying to figure this out.

tzoid9

I would have a difficult time believing that the '017's have any octane requirements than the 015's or 016's. 91 octane fuel is all that's available in several of the western USA states. The cars are tuned to run on 91 octane but have the ability to generate more HP/Torque with higher octane fuel, like the 93 octane available in many eastern states. I believe you're concern is unjustified.

RandomTask

^^ Bingo. Basically run the highest you can aka not WaWa wato-gas.

Technically the car would run on regular but it would be pinging/knocking and you risk hurting a piston from predetonation. This really only applies under load.

davepl

My guess is that they've partially addressed the overheating issue by running a more aggressive timing scheme (or less retard due to high intake temps, etc) and that in turn requires more octane.

The best I can buy here (WA) is 92, however.

If it actually fixed the track heating I'd be willing to run a can or Torco in each tank to bring up the octane if I could run that tune, but I'd really want to know what the rationale for the higher octane requirement is/was before I started to emulate it.

My big question, though, is when you say you've "just learned" that it requires 93, where'd you learn that?

fleming23

https://www.corvetteforum.com/forums...post1593475076

rbartick

The octane requirements are in the 2017 manual. Someone actually posted screen grabs from both the 2016 and 2017 manuals a few weeks ago:

https://www.corvetteforum.com/forums...post1593304193

My guess is the 2017 cars have the new "100 octane tune".

jordanC6Z06

Here is the 15-16 manual vs. the 2017 manual. The 2017 manual asks for a min of 93 or loss of performance will occur...

jordanC6Z06

I read on another post about the dyno with the 2017 Z and someone posted showing the octane requiments in the manual between the 2015/2016 and 2017. See below, I just saved an reposted them.

gve

My 2016 surges and feels like it's missing with 91 octane and light throttle. When I use 93 or higher it runs much better. I'm not surprised they upped the recommended octane based on my experience.

etekberg

That's bad news for me. 93 is a pain in the *** around here. I've even considered switching to E85 on a C5 just to get around having to dick around mixing race gas.

Oleman

I run 93 in my 2015 always have. So used to putting in since my 09 has to have it never even thought about 91.

K1600GT

I read in another post where someone was adding a couple gallons of E85 to a tank of 91 to get up to 93. Does this work?

For or the people that know more about the pluses and minuses to this please speak up.

sTz

My '16 runs better with 93, which I generally use anyway. My previous GT500 ran better with 93 too. GM is addressing the obvious in the '17 owner's manual. I doubt that it's anything more...

tzoid9

So what are we concluding, here. I have a '016 M7 and have NEVER experienced any knocking or anything else, but 93 octane fuel is readily available at most gas stations where I live, including the discount or off brand locations like mini marts. So is the consensus that 2015 & 2016 owners should consider getting the "100 0ctane" tune from GM? If that tune makes the car run stronger with the same 93 octane fuel and it's supported by GM (ie it doesn't cancel the car's warranty), then it sounds like a respectable idea. Am I getting this correctly or f'd up?

lordofwar

how about a bottle of octane boost when you fill it up?

phantasms

This is exactly what I want to know. I always fill up with 93. Should I go for the 100 tune with hopes of keeping better timing when the temps go up?

Bill Dearborn

I spent two days running at Carolina Motorsports Park running 90 octane premium without Ethanol. Car ran fine. If there was a drop in power the rear R7s didn't know it. They kept spinning in 3rd gear at 85 to 90 mph.

Bill

mvisible

So if I had two z06's. One a 16 and one a 17 and they both had the same 91 fuel, would the 16 make more power?

7.0ltrpower

I smell 's..... I don't believe "Owners Manual" pics. looks photoshop. So read your own manual. My '16 manual says use 91. Never heard pinging w/ 91....Just enjoy.

erick_e

Straight from Chevrolet.

http://www.chevrolet.com/content/dam...ers-Manual.pdf