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Old 05-04-2003, 03:17 AM   #1
V6
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Default 2.5RS owners, what grade of fuel are you using?

Hi to all 2.5RS owners (MY98-04),

Just like to know what grade of fuel are you using?

87?
89?
91?

With or without any mods (NA of course, eg. Cobb's power package stage 1, 2 or 3)

Thanks.
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Old 05-04-2003, 04:10 AM   #2
Foz
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87...
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Old 05-04-2003, 04:41 AM   #3
Paul Sakai
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87
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Old 05-04-2003, 05:13 AM   #4
joefocker20
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I ran 91 today, and my car was noticeably faster w/ the PROECM. I beat a GTP bad today, letting off at 90MPH, so it must help somewhat..
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Old 05-04-2003, 07:09 AM   #5
codger
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89 - just to be on the safe side. I've never noticed pinging with the little bit of 87 I used to use, but since then I've modded it a bit and drive it hard. PDM intake, Amsoil air filter, Brullen headers, Magnaflow exhaust, lightened pulleys.
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Old 05-04-2003, 10:41 AM   #6
orndog
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Codger, do you like that PDM intake? I am having trouble deciding if the Cobb is worth the money over a $50 aluminum tube. Since I have an OBS with the 3.9 gearing (instead of 4.11 in an RS) I am worried about low end torque loss.
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Old 05-04-2003, 11:21 AM   #7
watcher in the sky
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I use 93 ... well, actually i have used it since i bought the car. When my clutch was gone, my dad put 87 in it, called me the next day, and asked if my milage had gone down significantly, i told him no... he said he had used a 1/4 tank and it had only 76 miles on that bit, I asked if he thought it was bad gas.. "It cant be, i put 87 in it.."........... Um, well dad, I have been using 93 since day one, and occasionally putting black bottle 104 in, so I dont think the scoob likes cheap gas.
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Old 05-04-2003, 12:29 PM   #8
Blindeye_03
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93...I have a proecm chip .

-justin
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Old 05-04-2003, 12:47 PM   #9
Brad Pittiful
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87...no problems with using it
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Old 05-04-2003, 01:02 PM   #10
Dr Ken
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I've got ProECM and without a scrap of hard data, I have believe the following to be evident:
91 - best MPH <---- oops, I meant MPG
87 - most perky at low end
89 - current compromise, which I like.

I think the brand also makes a noticible difference, IMO... The major brands' (Chevron) is better than the little guys', whos gas maybe cheaper. - Ken

Last edited by Dr Ken; 05-05-2003 at 12:14 AM.
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Old 05-04-2003, 02:47 PM   #11
Cujo31
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she takes 87 and likes it....
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Old 05-04-2003, 02:48 PM   #12
dcoty
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94...man thats stuff is expensive, but the car needs it.
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Old 05-04-2003, 03:49 PM   #13
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Quote:
Originally posted by orndog
Codger, do you like that PDM intake? I am having trouble deciding if the Cobb is worth the money over a $50 aluminum tube. Since I have an OBS with the 3.9 gearing (instead of 4.11 in an RS) I am worried about low end torque loss.
I just got my cobb put on the other day...I notice no loss of torque down low but I do feel it come on faster and harder as it moves through rpms...That and the sound is the other thing too...nice at WOT..

Oh...I use 87 but occasionaly 89 I think it helps a little to get some of the carbon burnt out...dunno....
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Old 05-04-2003, 04:10 PM   #14
Kevin Thomas
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Quote:
Originally posted by Dr Ken
I've got ProECM and without a scrap of hard data, I have believe the following to be evident:
91 - best MPH
87 - most perky at low end
89 - current compromise, which I like.
What was your best mph with 87 and 89? Are you talking about top end and/or 1/4 mile time mph?
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Old 05-04-2003, 04:16 PM   #15
MattDell
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Default

I think he meant MPG.





-Matt
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Old 05-04-2003, 04:53 PM   #16
cvalle-sd
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When I had electronic spark advance, I ran 92, but now, unless the weather gets pretty hot (in which case in use 89) I just use 87, and she runs real nice like.
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Old 05-04-2003, 05:55 PM   #17
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I've ran 87 even with a ProECM, too some measurements and now switched to 91 to see if I can tell the difference. After 3 days of 91....nothing.
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Old 05-04-2003, 06:06 PM   #18
Crimson
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89 Ethanol
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Old 05-04-2003, 07:53 PM   #19
Siper2
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87, almost always. I ran 89 several times shortly after I bought the car, but never noticed any differences, really.

I ran 89 while living in Davenport, IA (for a year) sometimes, because at a lot of gas stations the 89 was cheaper. Local ethanol.

(Corn is good...)

-S2-
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Old 05-04-2003, 08:40 PM   #20
Russell Rogers
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Default gas

92 is all my baby gets.
Russell
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Old 05-04-2003, 08:51 PM   #21
nySulli
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mines seen 93 both times i've filled it up, probably won't see anything less
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Old 05-04-2003, 10:26 PM   #22
NC2.5RS
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I ran 93 at one point with no mods, didnt notice a difference. Im running 87 now, and have been for about 9 months.
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Old 05-04-2003, 10:27 PM   #23
NC2.5RS
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I might go back and run 93 again and see if with mods it does anything for the car.
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Old 05-04-2003, 11:39 PM   #24
joefocker20
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Unless you can advance timing, all a higher grade of gas does is reduce the chances of detonation. With a PROECM, the car advances timing farther to a point when the knock sensors starts detecting knock and pulls the timing a little, so I would guess the better gas you run, the more the car will advance timing. Anyone used race fuel and checked the amount of timing advance?
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Old 05-05-2003, 01:02 AM   #25
mycarsux
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i use 87, but my car is stock. does octane boosters help at all??
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