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Old 12-17-2009, 05:24 PM   #1
ptk
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High Test Gas

2009 Sahara Unlimited.
4500 miles on the odometer, all with premium gas.
Just got around reading the owners manual.
(When all else fails, read the directions).
Book states that the 3.8L should run fine on 87 octane.
OK.
Also says that running high test could be bad for the engine.
I've always viewed premium gas as a means to cheap performance.
No noticeable problems at all running it in the 2009.
Anyone know the scientific reason why the book says run regular and not high test?
Thanks.
PTK

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Old 12-17-2009, 05:32 PM   #2
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Always use the lowest octane you can without engine pinging. (detonation)

There is no performance gain when you run higher than recommended octane and possibly a reduction.

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Old 12-17-2009, 06:17 PM   #3
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Higher octane fuel just takes more pressure to ignite. There is no difference in the energy potential in premium over cheap regular fuel. If it knocks and pings, then you want to run a higher octane, if it doesn't, then don't. High octane fuel in a Jeep only lightens your pocket IMO.
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Old 12-17-2009, 07:51 PM   #4
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87 is the proper octane for your new Jeep. High octane is for high compression engines. It also tends to help older vehicles that were meant to run on leaded fuel run more stable too.
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Old 12-18-2009, 06:37 AM   #5
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Higher octane fuels are less volatile and resist heat & compression detonation. Due to their additives, some residual byproducts may remain in your top end after their incomplete combustion.
Referring to higher octane fuels as high-test, premium, the good stuff, etc., is a misnomer. It's the same fuel with additives to reduce its flashpoint.

Now, if you were to install a blower or aftermarket head, , you'll need to pony-up for the higher octane fuel.

Octane rating - Wikipedia, the free encyclopedia
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Old 12-18-2009, 07:07 AM   #6
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Wow, "high test", showing your age a bit with that term. Uh, err, what I meant to say was, "What is high test, I've never heard of that term before?"
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Old 12-18-2009, 08:14 AM   #7
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Wow, "high test", showing your age a bit with that term. Uh, err, what I meant to say was, "What is high test, I've never heard of that term before?"
High Test.
Also known as Custom, Super, Premium Leaded, Sunocco 260 (maybe 280).
Other timeless phrases you may have missed by being born too late.
Retreads, Re-Refined Oil, Points and Condensors, Test Pipes, 90 Weight, STP, Cold Starting Fluid, Timing Lights, Bar's Stop Leak (works great!), manual chokes, I could go on forever.

Old motor vehicles turn ordinary people into mechanics.
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Old 12-18-2009, 09:35 AM   #8
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Hey Hilldweller: I thought you guys ran on moonshine?
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Old 12-18-2009, 09:46 AM   #9
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Hey Hilldweller: I thought you guys ran on moonshine?
You jest but the petro-chemical geeks sit right alongside the distillery geeks in my lab; remarkably similar needs for equipment in the manufacturing of those products.
We had a tech from Makers Mark here a few months ago that brought a suitcase full of samples with him; my kind of customer...

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Old 12-22-2009, 11:11 AM   #10
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Hey PTK,

You forgot Amoco white gas, dimmer switches (on the floor), and three on the tree.
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Old 12-22-2009, 11:17 AM   #11
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Damn I must be getting old, I remember all of those
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Old 12-22-2009, 11:40 AM   #12
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Hey PTK,

You forgot Amoco white gas, dimmer switches (on the floor), and three on the tree.
I grew up driving various Jeeps and old Ford Vans, mostly.

I still remember the first Japanese cars I drove, and being all confused with the steering column knobs and switches. I thought that was just ridiculous, but I surely have gotten used to it.

And column shifting for automatics (I know that's not a three on the tree) is coming back. Evidently it makes more room for cup holders!
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Old 12-22-2009, 11:43 AM   #13
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You jest but the petro-chemical geeks sit right alongside the distillery geeks in my lab; remarkably similar needs for equipment in the manufacturing of those products.
We had a tech from Makers Mark here a few months ago that brought a suitcase full of samples with him; my kind of customer...

Based on your screen name and where you live, I have developed a strong opinion on you and your lifestyle. It's closer to possum-hunting and white lightening running. Hound dogs under the porch.

So what's all this crap about you in a scientific setting? A lab? Pshaw! I reject your reality and am keeping my unfounded stereotypes.
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Old 12-22-2009, 12:36 PM   #14
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Based on your screen name and where you live, I have developed a strong opinion on you and your lifestyle. It's closer to possum-hunting and white lightening running. Hound dogs under the porch.

So what's all this crap about you in a scientific setting? A lab? Pshaw! I reject your reality and am keeping my unfounded stereotypes.
It's a multi-use facility: GC/LC-MassSpec training lab, RF interface software R&D, and Electronic Measurement Group sales/marketing. I'm the senior admin.
But I'm generally shirtless and in overalls with a straw hat and bottle of 'shine under one arm.


We've got a lab that's not too far from you in Colorado Springs on Garden of the Gods Blvd. Big place too.
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Old 12-22-2009, 12:48 PM   #15
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I got an image.

Click image for larger version

Name:	a3.jpg
Views:	31
Size:	186.7 KB
ID:	13912
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Old 12-22-2009, 12:52 PM   #16
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I got an image.

Attachment 13912
Holy moly; that is one of our machines...
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Old 12-22-2009, 03:16 PM   #17
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Quote:
Originally Posted by ptk View Post
2009 Sahara Unlimited.
Book states that the 3.8L should run fine on 87 octane.
OK.
Also says that running high test could be bad for the engine.
I've always viewed premium gas as a means to cheap performance.
No noticeable problems at all running it in the 2009.
Anyone know the scientific reason why the book says run regular and not high test?
Thanks.
PTK
I hadn't read that. I'm assuming that using a Flashpaq with a 93 octane tune negates the "could be bad" part. I mentioned to my service manager that I was running 93 octane for a 91 octane tune because we donít have 91 here in WV. He told me what others have said here; higher octane fuel is harder to ignite. He suggested I run the 93 octane tune instead of the 91. I like the added power, donít want to go back to 87 octane.
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Old 12-22-2009, 03:57 PM   #18
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Hey PTK,

You forgot Amoco white gas, dimmer switches (on the floor), and three on the tree.
Very good call.
Don't forget the side vent windows either!
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Old 12-22-2009, 04:31 PM   #19
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Between this thread and the PBR thread, I'm starting to feel old.

I don't miss adjusting the low speed jet any more than I miss drinking Carling's Black Label beer.
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Old 12-22-2009, 07:22 PM   #20
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Between this thread and the PBR thread, I'm starting to feel old.

I don't miss adjusting the low speed jet any more than I miss drinking Carling's Black Label beer.
Don't forget Rhinegold, Iroquois or Old Mount Carbondale.
Fine brews gone but not forgotten.

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