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what octane for a '94 L27


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Guest TurboSedan
Posted

does the '94 L27 need high octane gas? i live at high altitude so my choices are 85, 87, or 91. what should i use?

 

fwiw i used 85 octane in my Cutlass (back when the 3.1 was NA of course) and it ran great for almost 120,000 miles with 85.

Posted

Run the 85. Our "regular" here is 87(I live @ 700' or so above sea level 8) ).

Guest TurboSedan
Posted

kick ass gas is freaking ridiculous right now. when i drove my GTS i had to use 91 and that costs $2.349/gallon right now! buying 85 would be a relief.

 

thanks Matt

Posted

i wouldn't run that lawnmower gas through the turbo engine, but thats me. Most forced induction cars require premium, so i'd at least use 87

Posted

i would try the lowest grade gas if the car pings go up a level if it still pings well looks like you have to use premium :?

Posted

I'd use 87, or try a 87/85 mixture. It's not supercharged so you should be fine without premium.

Posted

It's a 9.0:1 compression NA 3800 for god's sakes, at his altitude, 85 octane is adequate. L TWENTY 7, not sixty. 8)

Posted

Werd. The L27 and 87 octane is half of the reason I bought an SSE over an SSEi (other reason was insurance)

Guest TurboSedan
Posted
Werd. The L27 and 87 octane is half of the reason I bought an SSE over an SSEi (other reason was insurance)

 

that, and it seemed like most SSEi supercharged cars i came across were beat on compared to the NA SSEs. in a way i prefer the L27 simply because i think it's more reliable without the SC, gets better gas mileage, and of course, it's just going to be my daily driver. my Cutlass on the other hand, gets modded :)

Posted
It's a 9.0:1 compression NA 3800 for god's sakes, at his altitude, 85 octane is adequate. L TWENTY 7, not sixty. 8)

All series 1 3800's are actually 8.5:1 compression. :)

 

85 should be plenty for the L27.

Posted
It's a 9.0:1 compression NA 3800 for god's sakes, at his altitude, 85 octane is adequate. L TWENTY 7, not sixty. 8)

All series 1 3800's are actually 8.5:1 compression. :)

 

85 should be plenty for the L27.

 

Blame Shawn(j/k!), that's what's on the main site. :wink: Also, it's reported as 9.0:1 by a lot of other places. Where did you find the 8.5:1 figure at?

Posted

go with 87. Not as $$ as 91, but not as crappy as 85

Posted

No the L27 doesn't require high octane but I would use 87 octane and put the odd blast of 91 through it. That should keep her running like a top.

Guest TurboSedan
Posted

i'm going with 85 due to my elevation and the L27 isn't high compression. and it'll save me money of course.

Posted
Blame Shawn(j/k!), that's what's on the main site. :wink: Also, it's reported as 9.0:1 by a lot of other places. Where did you find the 8.5:1 figure at?

I used to think the 93+ L27's had 9:1 compression (that's what the chiltons manual said, older ones had 8.5:1 according to the manual). Then someone on a different forum said he knew the compression was 8.5:1 on all series 1 3800's. Seems like he knew 3800's, so I believed him....

Posted
Blame Shawn(j/k!), that's what's on the main site. :wink: Also, it's reported as 9.0:1 by a lot of other places. Where did you find the 8.5:1 figure at?

I used to think the 93+ L27's had 9:1 compression (that's what the chiltons manual said, older ones had 8.5:1 according to the manual). Then someone on a different forum said he knew the compression was 8.5:1 on all series 1 3800's. Seems like he knew 3800's, so I believed him....

 

Sean, do you have your owners manual still for your 93? I got my dad to look in his 1994 owners manual last night and he said they didn't even list the motor specifications(I know my 93 GP's owners manual lists the specs for the available engines that year).

Posted

Where do you guys get gas? Gas here in Buffalo only chices are 87 at $2.29Gal, 89 at $2.34Gal, 91 at $2.39Gal, or 93 at $2.44Gal. Never heard of 85.

Guest TurboSedan
Posted
Where do you guys get gas? Gas here in Buffalo only chices are 87 at $2.29Gal, 89 at $2.34Gal, 91 at $2.39Gal, or 93 at $2.44Gal. Never heard of 85.

 

85 octane is available in high elevation areas. i live at 4500ft so 85 octane is fine. the highest available here is 91....again because of our elevation.

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