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@  BlackBetty : (31 October 2014 - 10:23 PM) Ok will do
@  RegalTraveler : (31 October 2014 - 02:48 AM) Eh, I don't know anything about replacing the wire or the dash piece. Just guessing, but Dash sounds like more of a pain and higher probability of making an oops that you have to look at everyday. Can you run a temp cable from the sensor to where it terminates (or maybe vampire tap a temp wire to it at both ends) to see if it corrects the problem? I'd rather test that connection before tearing up the dash and replacing electronics. But that's just me.
@  keithr182 : (30 October 2014 - 09:46 PM) Tough call. I'd go with swaybars if you want a noticeable difference. Intake if you want more of a sound difference. But for me when I did sways and downpipe at the same time, it was an awesome upgrade.
@  Tobias05 : (30 October 2014 - 08:52 PM) Already own a DP, so with the sways I could install that too...
@  Tobias05 : (30 October 2014 - 08:51 PM) GMPP sway bars, or JMB intake?
@  RoadMonster : (30 October 2014 - 06:35 PM) you can guy performed 90 degree heater hose to avoid the belts
@  keithr182 : (30 October 2014 - 05:48 PM) Does anyone have any tips on routing intercooler hoses? I want to make sure they don't contact the belts, and it seems everyone has a slightly different setup.
@  Murphinator : (30 October 2014 - 02:46 AM) AARP bolts huh ? those must be old guy bolts ha ha
@  Crazyguy03 : (29 October 2014 - 04:48 PM) Got them AARP bolts installed
@  BlackBetty : (29 October 2014 - 05:29 AM) yes that is the sensor.. i did read about the wire due to the path it travels under the battery. I just wanted to know if replacing the dash piece for 30-50 bucks would solve it vs having to rewire or trace that. ill admit that would be a real PITA for me
@  RegalTraveler : (29 October 2014 - 03:00 AM) Hrmm.. I had that thermostat issue a few years ago. Sux b/c it affects the A/C since it already thinks it's balls cold out. I'd half wonder if it's not the sensor itself, but a faulty wire? Also, the ambient sensor you refer to, is that the one in front of the radiator? That's the one I had to swap.
@  Froman003 : (25 October 2014 - 07:32 PM) eliminated the extra baffles and plastic behind the headlight to allow more airflow through the filter
@  BlackBetty : (24 October 2014 - 02:26 AM) what did you do to the air box?
@  Froman003 : (23 October 2014 - 11:32 PM) Brake uprgrade and air box gut finished!! what a difference!!
@  BlackBetty : (23 October 2014 - 07:55 PM) if my climate control displays 50F at all times does that mean its bad and i need a new one? Ive gone thru 3 ambient temp sensors and no luck fixing it
@  BlackBetty : (21 October 2014 - 10:06 PM) lol at the milkshake song
@  kdubb : (21 October 2014 - 06:28 PM) Nvm. I don't need a pulley puller lol
@  kdubb : (21 October 2014 - 05:32 PM) Do i need a pulley puller for the p/s pump, if i need to move it out of the way, to replace the water pump?..98 gs
@  Frank : (21 October 2014 - 03:12 PM) lol
@  marcleach75 : (21 October 2014 - 01:11 PM) Thanks, I needed that.

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91 octane vs 94 octane (10% ethanol)


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13 replies to this topic

#1 Margarito

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Posted 13 March 2010 - 09:09 AM

Guys, what octane does the Series II 3800 engine like more?

I notice my car has much better fuel consumption with the 91 octane Shell V-Power which is pure gasoline and whatnot, car seems to run a little smoother maybe.

However, it seems to me, I have more explosive power with the 94 octane with 10% ethanol added, I am not 100% sure though.

I have a few questions.

Ethanol... what's the deal with ethanol, it's not 'good' for the engine is it? I know it has a high octane rating but other than that, is it possibly harmful?

I remember reading on GP forum of a guy who said he will never put any gas mixed with ethanol like Sunoco or Petro Canada do with their 94 octane, and he would rather run 91 octane with no ethanol.

Any ideas guys?

I'm still not sure what gas to use longterm... Shell V power 91 or Petro Canada 94.

Would going WOT on the highway with each gas, and seeing how many lbs of boost I get, be a good indicator of what gas is better? Making sure, that of course temperature is abou the same on both test days, or is that pointless?

Let's hear everyones thoughts on using 91 vs 94 with ethanol :)
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#2 rubberhead

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Posted 13 March 2010 - 10:19 AM

tried both, tracked the fuel mileage, similar driving conditions and found that my car likes the 91. KR didn't change much, a tad lower maybe with the 91. and its a couple pennies a litre cheaper.

/my $0.02
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#3 Geojb

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Posted 13 March 2010 - 01:50 PM

Would going WOT on the highway with each gas, and seeing how many lbs of boost I get, be a good indicator of what gas is better? Making sure, that of course temperature is abou the same on both test days, or is that pointless?

I would say pointless.
Too many variables with going WOT & temps & such to use boost as an inticator.
Calculations real ones, not DIC. would be the best for over all MPG.
For performance Track times or something that could measure 0-60 MPH times.
I thought I read somewhere tht ethonal changes the fuel ratio or we need to change "that 14.7 to 1" ratio with a tuner for best performance/KR/MPG.
Just my 0.02
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#4 djlamp14

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Posted 13 March 2010 - 07:38 PM

Ethanol is basically alcohol (rated at around 105-110 octane). It will get you more power but less gas mileage. So a little less KR (burns cooler I believe :think:) You will lose some number of MPG. Here in Minnesota a lot of the high HP guys tune and run for the E-85. They are able to run a little more stable with pulleys around 2.8 and 2.6 size. I have rode in a 11 second GP running E-85 and it will blow your balls off! >-) It also smells like Race gas
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#5 Geojb

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Posted 13 March 2010 - 10:35 PM

Aggggg, Ala Homer...... :drool:

It also smells like Race gas


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#6 djlamp14

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Posted 13 March 2010 - 10:58 PM

Aggggg, Ala Homer...... :drool:

It also smells like Race gas



...Just another positive. IMO at least.
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#7 uman44

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Posted 13 March 2010 - 11:05 PM

Ethanol is basically alcohol (rated at around 105-110 octane). It will get you more power but less gas mileage. So a little less KR (burns cooler I believe :think:) You will lose some number of MPG. Here in Minnesota a lot of the high HP guys tune and run for the E-85. They are able to run a little more stable with pulleys around 2.8 and 2.6 size. I have rode in a 11 second GP running E-85 and it will blow your balls off! >-) It also smells like Race gas



ABStiffGS's Regal was in the 11's on E85 and it smelled like corn...

Ethanol burns cooler (reducing KR), but releases fewer BTU's meaning less power per unit compared to gasoline (lower MPG). Gasoline companies add Ethanol inorder to use lower octane gasoline with Ethanol pumping up the octane.

As far as the OP's question... I always choose non-ethanol, even with the higher octane 10% stuff. However, I don't think either of us are pushing enough HP or fine tuning enough to make a difference.
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#8 MikeGS

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Posted 13 March 2010 - 11:09 PM

I liked the good old days when you could get 93 or 94 octane where there was no ethanol in it... The best of both worlds.

#9 Freddotron

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Posted 14 March 2010 - 06:38 AM

To the OP if you live in ontario imo the sunoco 94 is crap. Shell 91 Is the only thing I'll put in my tank. No exceptions. I can't speak for your 94 octane gas if your from the states. all i know is that in ontario the best gas you can get is shell 91
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#10 Margarito

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Posted 14 March 2010 - 01:34 PM

To the OP if you live in ontario imo the sunoco 94 is crap. Shell 91 Is the only thing I'll put in my tank. No exceptions. I can't speak for your 94 octane gas if your from the states. all i know is that in ontario the best gas you can get is shell 91


Im in Montreal.

I think Sunoco 94 is pretty much the same as Petro Canada 94.

Yeah Ill keep 91 V-power, thanks guys :_)
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#11 chromeGS

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Posted 14 March 2010 - 02:44 PM

my shell only has 93 with no ethinal* in it, well that is what the clerk said
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#12 MikeGS

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Posted 14 March 2010 - 08:07 PM

my shell only has 93 with no ethinal* in it, well that is what the clerk said

Never mind the clerk, look for the sticker on the pump. By law there should be on there.

#13 Crazyguy03

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Posted 14 March 2010 - 10:42 PM

Gas pumps are supposed to place the ethanol percentage somewhere where you can see it. In NY almost alll the stations say may contain up to 10% ethanol

Now my problem with that is, since we used to have Mobile being the only one NOT using ethenal, it was more expensive. Sunnoco was cheaper , offered 93 octane and had up to 10% ethanol.

Now both Mobile and Sunnoco are no longer 100% gas. As well as BP, Noco, Getty and tops etc... so anyone looking for pure gas in WNY is kinda out of luck.
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#14 Loly

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Posted 14 March 2010 - 10:55 PM

It's pretty much the same up here in Ontario...it's called "Industry Standard" and again, it's pretty much a continental thing.
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