Hummer Forums by Elcova  
Forums - Home
Source Decals

Source Motors
Custom. Accessories.

H2 Accessories
H3 Accessories
Other Vehicles

H2 Source

H2 Member Photos
H2 Owners Map
H2 Classifieds
H2 Photo Gallery
SUT Photo Gallery
H2 Details

H2 Club

Chapters
Application

H3 Source

H3 Member Photos
H3 Classifieds
H3 Photo Gallery
H3 Owners Map
H3 Details
H3T Concept

H1 Source

H1 Member Photos
H1 Classifieds
H1 Photo Gallery
H1 Details

General Info

Hummer Dealers
Contact
Advertise

Sponsored Ads
















 


Source Motors - custom. accessories.


Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > Technical Discussion and Customizing your H3

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 06-27-2012, 07:25 AM
Dave92270's Avatar
Dave92270 Dave92270 is offline
Hummer Professional
 
Join Date: Jun 2007
Location: SoCal
Posts: 456
Dave92270 is on a distinguished road
Default high octane fuel question

hi guys,

I moved my H3 to Europe, and finally got it licensed here (needed lights modifications and other stuff). anyway, back in Cali I used 87 octane fuel (or was it 86?) which is recommended for H3; here the lowest grade is 95 octane - do I need to reprogram the car computer, or can just let it go? I don't see any diference in engine peerformance...no rough running, idle rpm is same as well....

thanks for advice
__________________
2007 Black H3, 33" BFG Mud Terrains
Reply With Quote
  #2  
Old 06-27-2012, 02:24 PM
guruerror's Avatar
guruerror guruerror is offline
Hummer Authority
 
Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,762
guruerror is on a distinguished road
Default Re: high octane fuel question

95?! WOW!

I'd think you'd be fine with no programming change...

...however, I'd be temped to put in a 'Performance' tune and spend the weekend mashing the pedal on that fancy Autobahn; especially if you've got the 5.3.
__________________
CNTRY
DTOM
Reply With Quote
  #3  
Old 06-28-2012, 11:19 AM
Dave92270's Avatar
Dave92270 Dave92270 is offline
Hummer Professional
 
Join Date: Jun 2007
Location: SoCal
Posts: 456
Dave92270 is on a distinguished road
Default Re: high octane fuel question

Quote:
Originally Posted by guruerror
95?! WOW!

I'd think you'd be fine with no programming change...

...however, I'd be temped to put in a 'Performance' tune and spend the weekend mashing the pedal on that fancy Autobahn; especially if you've got the 5.3.



I know , high octane sounds fancy and performance promising, but not sure if H3 engine is capable to take advantage of it, BTW, today I bought some 15 gallons (around 60 liters actually here) of 95 octane, but they usually offer 98 octane as well. However today at this particular station I saw 100 octane fuel as well. They market it as "premium high-octane automobile benzin".

I think that I hopefully wont hurt anything using 95 octane without modification of computer. However, I'll give a call to guys who did mods on my H3 to be EU registered, they may offer some performance adjustments in the computer...

well if anyone else has experience with this stuff I'd be glad to hear it, thanks
__________________
2007 Black H3, 33" BFG Mud Terrains
Reply With Quote
  #4  
Old 06-28-2012, 09:50 PM
Humvee21 Humvee21 is offline
Hummer Veteran
 
Join Date: Oct 2010
Posts: 96
Humvee21 is on a distinguished road
Default Re: high octane fuel question

I am not 100% sure, but this is just my opinion/beliefs. The higher the octane is, the better it is. Therefore, as long as you do not put a lower octane than manufacture requirements then you will be fine with no programming changes. However, octane measurements between the US and Europe are measured differently. This means that we could have 87 octane in the US and have 87 octane in Europe, but both are completely different since it is measured differently. Do some research on octane measurements in Europe and see how it compares. Hope I helped some
Reply With Quote
  #5  
Old 07-02-2012, 09:43 PM
RenegadeX RenegadeX is offline
Elcova Newbie
 
Join Date: Oct 2011
Posts: 2
RenegadeX is on a distinguished road
Default Re: high octane fuel question

What you need to do is add a supercharger!

Higher octane just prevents premature detonation (knocking). You need it on high compression engines, supercharger equipped, etc. Your engine is not. You can use it without a problem.

Contrary to popular belief, higher octane is not high performance.
Reply With Quote
  #6  
Old 07-07-2012, 06:23 AM
Dave92270's Avatar
Dave92270 Dave92270 is offline
Hummer Professional
 
Join Date: Jun 2007
Location: SoCal
Posts: 456
Dave92270 is on a distinguished road
Default Re: high octane fuel question

Thanks guys,

Sounds like I'm going to be just fine with 95 octane without any modifications, but next time I'll speak with the shop which did EU conversion for me I'll ask them about this.

So far, the engine seems to run exactly the same as it did back in the US on 87 octane.
__________________
2007 Black H3, 33" BFG Mud Terrains
Reply With Quote
  #7  
Old 07-07-2012, 02:05 PM
fourfourto's Avatar
fourfourto fourfourto is offline
Hummer Guru
 
Join Date: Sep 2005
Location: fort salonga ny
Posts: 3,789
fourfourto is an unknown quantity at this point
Default Re: high octane fuel question

According to wikipedia,
RON is always about 4 to 5 points higher than the equivalent PON (Pump Octane number = AKI):


USA (AKI/PON) --- Europe (RON)

87 = 91
89 = 93
91 = 95
93 = 98
__________________
H3 gray adventure,brushguard,hood handles,sunroof,steps,crossbows,smokers package,window/sunroof visor,Airbrushed spare tire cover,mudflaps,K&N filter,SS Hummer insert,Hummer rubber mats,cargo rubber mat + shade,12 volt airhorn,eclipse nav/dvd/rear camera/mini remote,autostart,12 volt fridge,high beam garage remote,underhood air compressor, taillight bezels ,clinometer ,trailer brake and hitch.
Reply With Quote
  #8  
Old 07-08-2012, 04:56 PM
Dave92270's Avatar
Dave92270 Dave92270 is offline
Hummer Professional
 
Join Date: Jun 2007
Location: SoCal
Posts: 456
Dave92270 is on a distinguished road
Default Re: high octane fuel question

Quote:
Originally Posted by fourfourto
According to wikipedia,
RON is always about 4 to 5 points higher than the equivalent PON (Pump Octane number = AKI):


USA (AKI/PON) --- Europe (RON)

87 = 91
89 = 93
91 = 95
93 = 98

Thanks. That is interesting, I guess there is not much to worry about then.
__________________
2007 Black H3, 33" BFG Mud Terrains
Reply With Quote
  #9  
Old 10-21-2012, 06:48 PM
wpage's Avatar
wpage wpage is offline
Hummer Guru
 
Join Date: Jul 2006
Location: Stouts Creek
Posts: 4,192
wpage is on a distinguished road
Default Re: high octane fuel question

You could see some benefit from a tune. Timing is important with a hotter burn in you cylinder. Probably not a issue of damage but performance improvement to take advantage of a higher burn rate in combustion...

Good luck in your venue!
__________________
"For God so loved the world he gave his only son that whoever believe in him would not perish but have everlasting life. "
(John 3:16)
2006 H3 Slate Blue,Header,Jacked,CAI,Toyo35's,HHO.
Priors...
Explorer
Commander
71 Vette
You Name it!
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 08:40 PM.


Powered by vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.