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Old 06-20-2012, 01:48 PM   #1
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Tuning for higher octane gas

Hi all. This is a two part question, and I've searched to no avail...

We're talking L99 now btw.

1) In the low octane table, how much power does it make?

2) Where I live the worst gas I can get is 95 octane, with 98 and 99 being available. What would be the improvements from tuning the engine for 95 or 98 octane? Any power? Mileage?

Thanx

Stefan
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Old 06-20-2012, 01:54 PM   #2
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do you mean 85 octane when you say it's the worst gas you can get?
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Old 06-20-2012, 02:01 PM   #3
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Quote:
Originally Posted by Blast View Post
Hi all. This is a two part question, and I've searched to no avail...

We're talking L99 now btw.

1) In the low octane table, how much power does it make?

2) Where I live the worst gas I can get is 95 octane, with 98 and 99 being available. What would be the improvements from tuning the engine for 95 or 98 octane? Any power? Mileage?

Thanx

Stefan
There isn't a whole lot of power to gain for a higher octane tune on a stock motor. Add a blower and you'll really benefit.
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Old 06-20-2012, 02:02 PM   #4
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do you mean 85 octane when you say it's the worst gas you can get?

He means 95 and up. USA has very low octane ratings compared to Europe and damn near the rest of the world. We get the wuss gas.
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Old 06-20-2012, 02:05 PM   #5
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I know this is a no no in tuning, but with this I would copy the high octane table into the low octane table being that the worst octane he can get is 95. Of course getting it tuned right so there is no knock at all then doing the copy...just my .02
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Old 06-20-2012, 02:10 PM   #6
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He means 95 and up. USA has very low octane ratings compared to Europe and damn near the rest of the world. We get the wuss gas.
Ah didn't notice he was in Europe.
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Old 06-20-2012, 02:27 PM   #7
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Quote:
Originally Posted by Blast View Post
Hi all. This is a two part question, and I've searched to no avail...

We're talking L99 now btw.

1) In the low octane table, how much power does it make?

2) Where I live the worst gas I can get is 95 octane, with 98 and 99 being available. What would be the improvements from tuning the engine for 95 or 98 octane? Any power? Mileage?

Thanx

Stefan
Multiply your Octane number by .95 to get our Octane numbers.

Your 95 is our 91 and your 98 is our 93.

Tuning keeps you from getting stuck on the Low octane table which is a Problem with the L99 plus all the other magical benefits of a JRE Custom Tune.

Ted.
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Old 06-20-2012, 04:27 PM   #8
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Originally Posted by JANNETTYRACING View Post
Multiply your Octane number by .95 to get our Octane numbers.

Your 95 is our 91 and your 98 is our 93.

Tuning keeps you from getting stuck on the Low octane table which is a Problem with the L99 plus all the other magical benefits of a JRE Custom Tune.

Ted.
+1
They measure things different there.
To the op, dont worry about it, not enough of a change to effect anything. Chances are you are still getting knock.
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Old 06-20-2012, 10:17 PM   #9
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Thanx for the replies all. That makes sense. I however only got an answer to point 2). Anyone know anything about 1) ?

Stefan

Last edited by Blast; 06-20-2012 at 10:41 PM.
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Old 06-21-2012, 02:56 AM   #10
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Originally Posted by Blast View Post
Thanx for the replies all. That makes sense. I however only got an answer to point 2). Anyone know anything about 1) ?

Stefan
I don't think the car makes a real noticeable difference less in the low octane tables. It's going to probably retard your timing some and you might lose a little bit of HP and torque. But the numbers you are talking on a stock NA motor aren't really even worth talking about. If anything, the higher octane fuels are just good insurance for knock or detonation. When I had my car tuned I gained 6 RWHP and 4 RWT going from 91 octane to 100 Octane. My car is an L99 and is also NA. So not a huge gain. Now E85 on the other hand feels much stronger than the 100 Octane. I haven't had a chance to dyno it yet and I'm not sure if you have E85 available there. Also as the others have said, when you get into FI, the octane and race fuels make much more noticeable differences. E85 alone can net you 50-70 RWHP with a tune running a Super Charger. Cheap horsepower..

Anyway, didn't mean to rant, hope that helps some.
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Old 06-21-2012, 07:42 AM   #11
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Thanx for the replies all. That makes sense. I however only got an answer to point 2). Anyone know anything about 1) ?

Stefan
It depends on what octane is in the tank at the time so it is not that cut and dry.

Low timing on High octane can be very low on power.

Low timing On Low octane can make very good power for that octane.

Typically you can expect about 5-10 hp less per octane in the tank when tuned for that octane.
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Old 06-21-2012, 09:29 AM   #12
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SixG: Yeah, we can get E85 here. Basically at every gas station. And it's cheap too. 95 octane is 45% more expensive last I checked (3 weeks ago since I'm now in Florida on vacation in a rental SS conv) so it's actually cheaper to drive around on E85 than gas right now, that's what I'm using in my SAAB.

During these vacation weeks in the Camaro (first time ever in one I might add) I've really come to want one for myself, that's why the questions. I wouldn't be surprised if I got one within a year or two.

Ted: Thanx. I had read threads before and it sounded like a massive loss on power in the low table, that's why I wanted to know. Thanx for explaning (goes to everybody).
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Old 06-22-2012, 03:17 PM   #13
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I've read that an SS running on the low octane table is as slow as (or even slower than) the V6 Camaro.
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