super unleaded or regular - Defender Source
Defender Source  

Go Back   Defender Source > Non-Technical Discussions > Misc. Chit-Chat


Reply
 
Thread Tools
  #1  
Old November 20th, 2005, 09:57 PM
Rover- Girl

Guest
 
Posts: n/a
super unleaded or regular

Well, I know it's a V8 but its not a high performance engine...right !!??
I been putting mid grate in my D90...is this good enough ?
Just wondering.....
Thanks
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old November 20th, 2005, 11:07 PM
stevewhitaker's Avatar
stevewhitaker
Status: Offline
Stephen Whitaker
1994 D-90
Member
 
Join Date: Dec 2004
Location: Bruceville, Indiana
Posts: 145
Registry
Hi Christine. Mid-grade should to just fine assuming the engine is tuned properly. The compression on the engine is just below that where premium is required. I can run regular in mine for normal driving with no ill effects - - unless I really load up the engine by punching the gas while in top gear at low RPMs, then I hear some slight pinging. If you hear some detonation (pinging) while under load, step it up a notch to higher octane, otherwise save your $$.
Reply With Quote
  #3  
Old November 21st, 2005, 07:35 AM
Eric Siepmann
Status: Offline
Eric W. Siepmann
1997 Defender 90 SW
Member
 
Join Date: Dec 2003
Location: Chicago, IL, Cook
Posts: 883
I disagree. The manual says 93. I thought I could get away with mid grade and tried it. The truck did not like it. I went to super and all was well.

I know of one other truck with the exact same results.

EwS
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old November 21st, 2005, 07:57 AM
scoloco's Avatar
scoloco
Status: Offline
Scott
'94 D90 ST
Member
 
Join Date: Jan 2004
Location: Manchester NH
Posts: 372
Quote:
Originally Posted by Eric Siepmann
I disagree. The manual says 93. I thought I could get away with mid grade and tried it. The truck did not like it. I went to super and all was well.

I know of one other truck with the exact same results.

EwS
How did your engine tell you that it didnt like low octane?
I'd sorta agree with Steve - you can try the lower octane and see if it works. If it does, good for you. If not, go back to the good stuff. Pinging is a good clue to up the octane.
Generally at higher altitudes you can get away with using lower octane fuel. Howevever, on my couple trips across country last year, I noticed that the regular was the same price, but 85 instead of 87 octane, premium was 89 instead of 91, but they were charging lowland prices.
Reply With Quote
  #5  
Old November 21st, 2005, 08:46 AM
rover4x4's Avatar
rover4x4
Status: Offline
Phillip
1995 SW #487/500
Member
 
Join Date: Sep 2003
Location: The Old North State
Posts: 7,523
Registry
super
__________________
Poor gas mileage gets you to the best places on earth
Reply With Quote
  #6  
Old November 21st, 2005, 09:09 AM
Eric Siepmann
Status: Offline
Eric W. Siepmann
1997 Defender 90 SW
Member
 
Join Date: Dec 2003
Location: Chicago, IL, Cook
Posts: 883
Quote:
Originally Posted by scoloco
How did your engine tell you that it didnt like low octane?
I'd sorta agree with Steve - you can try the lower octane and see if it works. If it does, good for you. If not, go back to the good stuff. Pinging is a good clue to up the octane.
Generally at higher altitudes you can get away with using lower octane fuel. Howevever, on my couple trips across country last year, I noticed that the regular was the same price, but 85 instead of 87 octane, premium was 89 instead of 91, but they were charging lowland prices.
It ran like shit.
Reply With Quote
  #7  
Old November 21st, 2005, 12:27 PM
Hans's Avatar
Hans
Status: Offline
Hans Haase
The D-90.com Lab Rat
Member
 
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,381
When my engine was all original, it pinged a lot under load on 87/89 gas.... pinged a little bit with 91.... ran fine with 93.

After putting in the composite head gaskets, it runs fine on mid-grade with no pinging in any conditions.

-Hans
__________________
My oil line fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
My 100k stopped odometer fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.
Reply With Quote
  #8  
Old November 21st, 2005, 01:40 PM
WCURoverD90's Avatar
WCURoverD90
Status: Offline
Jason Habbal
1997 Defender 90 #1104
Member
 
Join Date: Nov 2003
Location: Lake Wylie, SC
Posts: 562
I used to use regular and my truck knocked a little bit and ran like shit. I switched to premium and it ran great.
__________________
"tell them to phucough"

Land Rover-The Best 4x4xFar
Reply With Quote
  #9  
Old November 21st, 2005, 11:27 PM
AggieD90's Avatar
AggieD90
Status: Offline
Kevin Collins
'95 AA Yellow & '97 Willow Green
Member
 
Join Date: Feb 2004
Location: Houston, Texas
Posts: 312
I made a deal with mine once...

I told it when it decided to use less fuel it could have higher octane again. I started using regular and experienced no problems. If they developed someone would have to speak with the current owner. I asked my dad (a petrol engineer) and he said the same thing to me others have said. Try it...if it runs okay...it'll be fine. I run regular in my '95 Classic - 130K miles and ask anyone who knows me - it's the holy grail of LRs.
Reply With Quote
  #10  
Old November 22nd, 2005, 08:11 PM
devinchi's Avatar
devinchi
Status: Offline
Tim Brown
'95 D90 ST '99D2
Member
 
Join Date: Jul 2005
Location: Perkinsville VT
Posts: 231
My 90 seems to be allergic to anything but the top grade of gasoline.
__________________
I got your JEEP thing, now it hurts when I pee!!
Reply With Quote
  #11  
Old November 22nd, 2005, 09:05 PM
Rover- Girl

Guest
 
Posts: n/a
Thanks...
Truck runs great on midgrate...
I'll guess I stick with it
Reply With Quote
  #12  
Old November 28th, 2005, 06:31 PM
rustydefender
Status: Offline
Russell Newton
97 D-90 sw
Member
 
Join Date: Oct 2004
Location: Jacksonville Florida
Posts: 213
Why do european cars always tuned for premium? It is a buick derived v-8 isn't it?
Reply With Quote
  #13  
Old November 28th, 2005, 06:39 PM
jimmy salmon's Avatar
jimmy salmon
Status: Offline
jimmy salmon
94 D90 AA Yellow
Member
 
Join Date: Jun 2004
Location: Methuen MA USA
Posts: 1,342
difference is pennies between grades in the UK
__________________
3rd low and BOOT IT

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #14  
Old November 28th, 2005, 08:30 PM
rustydefender
Status: Offline
Russell Newton
97 D-90 sw
Member
 
Join Date: Oct 2004
Location: Jacksonville Florida
Posts: 213
Almost everybody does diesel over there right? Why not engineer a v-8 that runs on regular for the u.s. market or better yet get a an epa certified diesel!
Reply With Quote
  #15  
Old November 28th, 2005, 11:18 PM
Hans's Avatar
Hans
Status: Offline
Hans Haase
The D-90.com Lab Rat
Member
 
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,381
It wasn't until recently that the Europeans had the same fuel restrictions as us. So they could support the higher compression ratios without the same problems as here in the US. Heck, I think they only recently got rid of leaded fuel.

-Hans
__________________
My oil line fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
My 100k stopped odometer fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.
Reply With Quote
  #16  
Old November 29th, 2005, 08:57 AM
WCURoverD90's Avatar
WCURoverD90
Status: Offline
Jason Habbal
1997 Defender 90 #1104
Member
 
Join Date: Nov 2003
Location: Lake Wylie, SC
Posts: 562
Quote:
Originally Posted by rustydefender
Why not engineer a v-8 that runs on regular for the u.s. market or better yet get a an epa certified diesel!

Because that would make too much sense.......
__________________
"tell them to phucough"

Land Rover-The Best 4x4xFar
Reply With Quote
  #17  
Old November 29th, 2005, 10:59 AM
Doug's Avatar
Doug
Status: Offline
Doug Walker
TVR5L-powered NAS D-110
Member
 
Join Date: Oct 2003
Location: Los Angeles, CA, USA
Posts: 880
I've been experimenting with colder plugs. Went to NGK B8ES plugs and that cut the pinging quite a bit. Now I have B9ES for a couple of days (changed this weekend) and zero pinging (so far!). I need a nice hot 85 degree day to know for sure.

Each colder plug lowers the combustion chamber temp by about 80 degrees. Drawback is that colder plugs fowl easier. Only time will tell....

Doug W.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Non-Technical Discussions > Misc. Chit-Chat

Thread Tools

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
Set of 5 Q78 Super Swampers RedRhinoProducts For Sale - Parts 1 February 1st, 2006 06:43 PM
1995 Triumph Daytona Super III lrnasd90 For Sale - Vehicles 4 April 18th, 2005 08:26 PM
Super Siphon Davis Misc. Chit-Chat 5 November 8th, 2004 11:47 PM
35/16/15 Super Swamper TSL Boggers & rims TDI Guy For Sale - Parts 4 October 18th, 2004 10:18 AM
35x12.50r16.5 Super Swamper SSR's and aluminum wheels Chris Cox For Sale - Parts 0 July 12th, 2004 04:24 PM


All times are GMT -5. The time now is 12:23 PM.


Copyright