87 octane
Thread Starter
Launching!
Joined: Feb 2005
Posts: 296
Likes: 0
From: Schaumburg
87 octane Does anyone else use 87 octane? I've tried 87, 89 & 93. The only difference I notice is the price 
. Here is what the manual says:
If your vehicle has the 5.7L V8 engine (VIN Code G),
use premium unleaded gasoline with a posted octane
of 91 or higher for best performance. You may also
use middle grade or regular unleaded gasoline rated at
87 octane or higher, but your vehicle’s acceleration may
be slightly reduced. If the octane is less than 87, you
may get a heavy knocking noise when you drive. If it is
bad enough, it can damage your engine.
. Here is what the manual says: If your vehicle has the 5.7L V8 engine (VIN Code G),
use premium unleaded gasoline with a posted octane
of 91 or higher for best performance. You may also
use middle grade or regular unleaded gasoline rated at
87 octane or higher, but your vehicle’s acceleration may
be slightly reduced. If the octane is less than 87, you
may get a heavy knocking noise when you drive. If it is
bad enough, it can damage your engine.
It's well-known that these engines will actually get worse gas mileage using 87 octane thus making the price difference negligable. The only thing you risk is poor performance and/or damage to the engine.
I tried 87 in '02 and it knocked and stumbled and felt like crap. I tried it for a couple of mos to let the pcm get adjusted, but it didn't help. Went back to 93. I always run 87 in my '99 TA and it does not bother it at all. The Ram Air must be more sensitive to it. Besides, it is only an extra $2.50 per tank. If you car seems ok with 87, then stay with it.
On The Tree
Joined: Feb 2005
Posts: 180
Likes: 0
dude,it says in your sig that your motor has a tune in it? why in world would you put 87 in it? if anything you need a little more octane depending on how much your timing has been bumped up. i personally use nothing but sunoco 94 in mine.but thats what its tuned for
Thread Starter
Launching!
Joined: Feb 2005
Posts: 296
Likes: 0
From: Schaumburg
The reason I asked is because I dont notice a difference between 87 & 89. It feels the same. 93 a little difference. I bought the car stock with only 7k miles on it. Almost brand new. Maybe the car only knows 87, 89 octane?
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Originally Posted by WADDISME
I tried 87 in '02 and it knocked and stumbled and felt like crap. I tried it for a couple of mos to let the pcm get adjusted, but it didn't help. Went back to 93. I always run 87 in my '99 TA and it does not bother it at all. The Ram Air must be more sensitive to it. Besides, it is only an extra $2.50 per tank. If you car seems ok with 87, then stay with it.
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iTrader: (3)
Joined: Apr 2005
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From: Hometown:Mount Carmel, IL Current: Las Vegas, NV
my take...if youre payin for the damn car...what's 2.50 a week? thats half of a fast food meal that could be saved by eating at home. youre trimming pennies where it could really F something up. pay the money or get a car that doesn't require it. just my .02...which would make that extra bill on top of regular 2.48 instead of 2.50. come on guys...dont be super cheap bastards.
Originally Posted by Swang
my take...if youre payin for the damn car...what's 2.50 a week? thats half of a fast food meal that could be saved by eating at home. youre trimming pennies where it could really F something up. pay the money or get a car that doesn't require it. just my .02...which would make that extra bill on top of regular 2.48 instead of 2.50. come on guys...dont be super cheap bastards.
) 
11 Second Club
Joined: Feb 2003
Posts: 5,524
Likes: 1
From: The South
WADDISME: You seriously need to resize your signature. It makes reading this page a PITA b/c I have to scroll from side to side. There is a limit to sig size. I forget what it is, something like 350 x 150 maybe?
I can tell you one thing: 1064 is way too wide.
I can tell you one thing: 1064 is way too wide.
Originally Posted by blkZ28spt
WADDISME: You seriously need to resize your signature. It makes reading this page a PITA b/c I have to scroll from side to side. There is a limit to sig size. I forget what it is, something like 350 x 150 maybe?
I can tell you one thing: 1064 is way too wide.
I can tell you one thing: 1064 is way too wide.
11 Second Club
Joined: Jul 2003
Posts: 2,311
Likes: 2
From: loudoun county,va
WTF???????
this is like the 10th person in recent time that said they wanna run 87 in there 10.5/1 compression motor....
WHAT THE HELL ARE YOU SMOKIN ?????
whether or not YOU notice anything depends on how tuned your ear is to your car...
but understand with NO uncirtainty... you car feels it....
this is like the 10th person in recent time that said they wanna run 87 in there 10.5/1 compression motor....
WHAT THE HELL ARE YOU SMOKIN ?????
whether or not YOU notice anything depends on how tuned your ear is to your car...
but understand with NO uncirtainty... you car feels it....
one more thing to remember is that most cars, even bone stock will knock with 93 octane.i know if you run 87 your car will get kr no matter what.And also remember the knock sound you usually hear is not the flame front crashing together but your piston and rod bearings under the immediate shock load.not to good if you ask me.
Thread Starter
Launching!
Joined: Feb 2005
Posts: 296
Likes: 0
From: Schaumburg
Ok. Maybe the manual is wrong then. 
Again here is the quote:
If your vehicle has the 5.7L V8 engine (VIN Code G),
use premium unleaded gasoline with a posted octane
of 91 or higher for best performance. You may also
use middle grade or regular unleaded gasoline rated at
87 octane or higher,
but your vehicle’s acceleration may
be slightly reduced.
If the octane is less than 87, you
may get a heavy knocking noise when you drive. If it is
bad enough, it can damage your engine.
Again here is the quote:
If your vehicle has the 5.7L V8 engine (VIN Code G),
use premium unleaded gasoline with a posted octane
of 91 or higher for best performance. You may also
use middle grade or regular unleaded gasoline rated at
87 octane or higher,
but your vehicle’s acceleration maybe slightly reduced.
If the octane is less than 87, you
may get a heavy knocking noise when you drive. If it is
bad enough, it can damage your engine.
yeah nothing but premium 93 goes in my tank. well of course when I stop by the local station with 110. then I put a couple of gallons of that in there. the bird likes the extra octane