Premium in the minivan.. don't think it likes it. - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Go Back   Fuelly Forums > Fuel Talk > General Fuel Topics
Search Today's Posts Mark Forums Read Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 05-03-2008, 07:51 PM   #1
Registered Member
 
GasSavers_RoadWarrior's Avatar
 
Join Date: Feb 2008
Posts: 1,652
Premium in the minivan.. don't think it likes it.

Hi folks,

So due to some weird chance, I ended up with a full tank of premium, 91 octane. I pulled up at the pump on empty and there was a sign on the pump "Out of regular, use premium at same price" and there was a maintenance crew there, looked like they were having some problem with the tanks or something... so I thought, "what the hell, I guess it's getting premium..." and filled up...

Driven a few trips, and the minivan doesn't seem to be liking it much, seem to have lost low end, and need to give it more pedal to get moving. It does sound a little smoother though. Kinda like with acetone, but without the get up and go. It seemed to improve a little the first couple of times I started it, but guess that was all the ECU trim could do and it's still not great. It likes midgrade 89 octane, to the tune of 5% more mileage, but since it's usually more than a 5% cost difference I use 87.

So I'm looking around for something to stick in it to drop the octane, might go with a litre of varsol and a couple of oz of 2 stroke oil. Figure it will probably clean it out while it's at it. Then I guess if it still feels sluggish I'll top it up with 87 when I've run a bit out. I guess I could advance the timing, but that's a PITA, and I'll have to set it back again next tank....

Road Warrior
__________________

__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 05-03-2008, 08:14 PM   #2
Registered Member
 
Join Date: Nov 2007
Posts: 228
Country: United States
Strange, our premium is 93...

But I will say this much:
With MOST fuel injected vehicles, the best grade of fuel for it is what the computer was tuned to use... So if for example your van was tuned for 87 octane then that would be the fuel that would likely result in the best performance (and FE).

The only way I know of to get around this is to have the computer re-programmed (to something like a stage-1 chip), neither a cheap nor an easy to do option.

Good luck
__________________

__________________
A FE gauge should be standard equipment in every vehicle.
8307c4 is offline   Reply With Quote
Old 05-03-2008, 08:48 PM   #3
Registered Member
 
GasSavers_RoadWarrior's Avatar
 
Join Date: Feb 2008
Posts: 1,652
It varies by brand here, this one is 91, others are 93 or 94...
__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 05-03-2008, 08:52 PM   #4
Registered Member
 
Join Date: Nov 2007
Posts: 228
Country: United States
Quote:
Originally Posted by RoadWarrior View Post
It varies by brand here, this one is 91, others are 93 or 94...
Yah okay I see... At least my experience has been with my Dodge which is apparently tuned for 87, any grade but 87 doesn't really do much for the truck... And in some ways much like yourself it almost seems like it hurts (thou I couldn't say for sure but the extra I have to pay at the pump sure don't help LOL).

The one other thing I did notice too thou, you might want to run 3-4 tanks full through it... The benefits of premium aren't always apparent on the first tank, but don't come yelling at me if after 15 tanks it still hasn't improved hehe

I did, I ran more than a few tanks through on my truck...
But in the end I went back to 87, it just wasn't showing me any benefit, none at all.

One way to find out is read your Owner's manual, some tell you what fuel to put in it, that is a fair indicator as to this tuning issue.
__________________
A FE gauge should be standard equipment in every vehicle.
8307c4 is offline   Reply With Quote
Old 05-03-2008, 09:16 PM   #5
Registered Member
 
2000mc's Avatar
 
Join Date: Oct 2007
Posts: 72
Country: United States
maybe its not just the octane. perhaps the station had a problem like water getting into fuel, and thought it was only affecting the regular grade, but maybe it was affecting all their fuels. maybe u got a lil extra water, or random contaminant.
__________________
2000mc is offline   Reply With Quote
Old 05-04-2008, 12:41 AM   #6
Registered Member
 
VetteOwner's Avatar
 
Join Date: Mar 2007
Posts: 1,546
Country: United States
Quote:
Originally Posted by 2000mc View Post
maybe its not just the octane. perhaps the station had a problem like water getting into fuel, and thought it was only affecting the regular grade, but maybe it was affecting all their fuels. maybe u got a lil extra water, or random contaminant.
ya cuz octane DOES NOTHING on a low compression engine if you go low enough you could run the car of pretty much anything that burns (hence during the 1930's depression theres story's of people running thier old cars off of moonshine)

The octane ratings are there so if you have a high compression engine (gets more power out of it) sometimes just the heat from the combustion chamber and the amount of compression is enough to actually ignite the mix without a spark plug firing, higher octanes don't ignite when compressed the same amount.

so whats that mean: it means if your car calls for regular then you can use regular- race fuel with no harm or performance drop or gain.

if your car calls for midgrade you can only use midgrade-racefuel cannout use regular because its octane is probably too low.

and obviously if your car calls for premium then you must use premium or race fuel...


so im betting you got water in it or rust particles, etc. BTW next time you see a station that is having repairs to the tanks or pumps DO NOT GO THERE...
VetteOwner is offline   Reply With Quote
Old 05-04-2008, 06:10 AM   #7
Registered Member
 
GasSavers_RoadWarrior's Avatar
 
Join Date: Feb 2008
Posts: 1,652
Don't think it's got water in because it's not stumbling. I was thinking that 91 had a few thousand less BTU than 87 though.
__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 05-04-2008, 12:25 PM   #8
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
I agree with 2000mc. If you really are experiencing reduced performance, the gas is defective or contaminated. Under no circumstance should increased octane cause decreased performance/economy.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 05-04-2008, 02:01 PM   #9
Registered Member
 
rgathright's Avatar
 
Join Date: Apr 2008
Posts: 189
Country: United States
Your high octane observation may hold true for the acetone yall seem to be testing. Maybe you will need a few tanks before the computer can fully adjust to the acetone?
rgathright is offline   Reply With Quote
Old 05-04-2008, 11:18 PM   #10
Registered Member
 
2000mc's Avatar
 
Join Date: Oct 2007
Posts: 72
Country: United States
Quote:
Originally Posted by RoadWarrior View Post
Don't think it's got water in because it's not stumbling. I was thinking that 91 had a few thousand less BTU than 87 though.
im not positive, but i also thought that 91 octane had fewer BTU than 87 octane. however, i was thinking that the difference is only a percent or 2, nothing you should be able to feel.
__________________

__________________
2000mc is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
03 Matrix P&G Woes Daox General Fuel Topics 9 10-08-2007 05:10 PM
DIY Hybrid drdavid831 Hybrid Vehicles 11 07-23-2007 11:49 PM
FE driving, good for mpg but bad for emissions? omgwtfbyobbq General Fuel Topics 21 05-16-2007 09:39 AM
Economical American cars through the years theclencher General Fuel Topics 6 03-21-2007 06:15 PM
Best climbing method. zpiloto General Fuel Topics 5 09-29-2006 04:45 AM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 03:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.