carrying the boost to redline will have to wait for the XV1 tune for the 2013 SHO's. Then I'm sure a 91 and 93 will be available. I'd say get the 93 tune and run 92 and if you plan to beat on the car use some octane booster. If you know what detonation sounds like just be sure you never beat on it if you hear that sound.
Step one ?
- Thread starter Mikesb
- Start date
steve142857
New member
If LMS is offering a 91 and a 93 octane, I'm pretty sure they could customize a 92 tune... If you ask nicely ; )Mikesb said:
This may sound like a dumb question, but here goes anyway.
If he put a tune in for 93 octane and he can only find 91 or 92, if you just drove it normally until you could fill the tank again, wouldnt the cars computer adjust?
Thats what the knock sensors are for. Or because you put a tune in the car, are the knock sensors over ridden ?
Im ONLY talking about one tank full of the lower octane
If he put a tune in for 93 octane and he can only find 91 or 92, if you just drove it normally until you could fill the tank again, wouldnt the cars computer adjust?
Thats what the knock sensors are for. Or because you put a tune in the car, are the knock sensors over ridden ?
Im ONLY talking about one tank full of the lower octane
breeves002
New member
If you are driving normally on 1-2 octane lower it shouldn't make a difference. When I was finding the best spark advance setting for my SCT tune I would program it +1 degree global spark over the previous setting then go do a few 0-60's while watching spark advance and VCT PIDs. When the spark was too advanced the car would knock (not audibly) and you could watch the spark advance instantly drop down to 0 then slowly climb back up again as a knock sensor response.
Best to stay at the octane your tune is rated for but if you keep the rpm low enough it should be ok.
Best to stay at the octane your tune is rated for but if you keep the rpm low enough it should be ok.
D
DJE624
Guest
If I could only find 91, I would just swap out to a 91 tune. Takes five minutes.
Back when I worked in the Chevron refinery in El Segundo, CA the blenders that made most of the octanes would typically be off a little. Many occassions when the blenders were out for maintenance, the octanes were boosted higher. So a 92 min. reading means, that is just a minimum. NOT EXACT! You may actually be getting 93 octane. Same especially true with the lower octanes. When I used Chevron exclusively, my '87 Monte CArlo SS liked 91 octane better, but I always ran 87 since most of the time the actual rating was 89-90.
I tried loading software to tuner. Albeit I am using a work computer since I only have a MAC at home. I get error message of invalid installer. Is this the software issue or maybe a permissions problem from work computer? I know they do limit internet access to certain websites and such.
I tried loading software to tuner. Albeit I am using a work computer since I only have a MAC at home. I get error message of invalid installer. Is this the software issue or maybe a permissions problem from work computer? I know they do limit internet access to certain websites and such.
Sounds like you do not have permission to install software on your work computer (very common restriction). Sometimes IT is willing to help you out if they know what's going on. Otherwise, a non-work PC is your only option 
Did you get the software EMailed to you? You could try having them resend it just in case it got corrupted on its' way over. Did you originally have it on your Mac and then transfer to the PC?
A helpful read: http://kb.winzip.com/kb/entry/134/
Did you get the software EMailed to you? You could try having them resend it just in case it got corrupted on its' way over. Did you originally have it on your Mac and then transfer to the PC?
A helpful read: http://kb.winzip.com/kb/entry/134/
I myself am not good with computers at all and I was having all sorts of problems trying to load the two files onto my computer. Sent a few emails to Anthony at LMS and he finally told me I may have to disable my virus file. I don't know exactly what I did, it did involve giving Norton permission to allow the exe file to load.
AT this point Im going to try and load the tunes into the car sometime when it
gets a little warmer outside this morning.
Maybe your experiencing the same problem with the virus protection.
AT this point Im going to try and load the tunes into the car sometime when it
gets a little warmer outside this morning.
Maybe your experiencing the same problem with the virus protection.
Problem is with the words for me. If you read the stage descriptions stage 4 and stage 4plus are radically different. I have two tunes on my tuner 91 & 93, I keep thinking I need to move up to the next stage. So what is it? Do I have two tunes for one stage or am I trying to go up to the next stage. This whole time I thought 91 meant 4 and 93 meant 4+
I've been known to beat dead horses and am not proud of being a looser but it is what it is
Thus far I am tickled pink with the performance of the tune and upgraded parts
Mike
I've been known to beat dead horses and am not proud of being a looser but it is what it is
Thus far I am tickled pink with the performance of the tune and upgraded parts
Mike
EcoBrick Bob
New member
Octane can be dependent on whether the transport driver put the fuel in the right underground tank! And.. is the station honest??? LOL
We need straight answers tread on LMS tunes for new comers and people looking into tunes
First there is no stage 4plus tune - only four v7 with 91 & 93 octane
What is that dyno sheet thing on the other tune thread that shows stock / 4 / 4+. That's way confusing. What is it really showing?
First there is no stage 4plus tune - only four v7 with 91 & 93 octane
What is that dyno sheet thing on the other tune thread that shows stock / 4 / 4+. That's way confusing. What is it really showing?
D
DJE624
Guest
That dyno shows stock, Stage 4 and Stage 4+ on a 2012 SHO. Really.
???
Here's my point - your dyno graph shows once again as much gain from 4 to 4+ as from stock to 4
So will I double my performance gains going from 91 to 93 tune
To answer my own question it's (NO)
The latest highest performance tunes they have for my car are 91/93
Going to 93 would be a very small increase over 91 like 10hp
Here's my point - your dyno graph shows once again as much gain from 4 to 4+ as from stock to 4
So will I double my performance gains going from 91 to 93 tune
To answer my own question it's (NO)
The latest highest performance tunes they have for my car are 91/93
Going to 93 would be a very small increase over 91 like 10hp
D
DJE624
Guest
You have a 91 Octane tune and a 93 Octane tune. You have the best available tunes from LMS for a 13-14 SHO. Forget about stages. Pick either one of those and fuel accordingly. The next upgrade will be the Xv1 for 91 and/or 93 octane. The Xv1 will not be available for some time. I'm thinking Spring.