Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V < 1 2  
 Reply to this topicStart new topic
> Unleaded vs Premium
Aaron Cox
post Sep 8 2003, 07:11 PM
Post #21


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
QUOTE(Neal @ Sep 8 2003, 01:52 PM)
My car has webers and I live in Seattle, would premium help ?, it's a 2.0 with euro pistons and a mild factory cam.

you cant use a factory FI cam with carbs. they run like crap apparently....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
PatW
post Sep 8 2003, 07:15 PM
Post #22


Wassup?
***

Group: Benefactors
Posts: 565
Joined: 19-February 03
From: Rocklin, CA
Member No.: 317
Region Association: Northern California
Union 76 sells 100 Octane Unleaded here in San Jose right out of the pump.
My 1.7 likes it.

Pat
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
swood
post Sep 8 2003, 07:25 PM
Post #23


Senior Member
***

Group: Members
Posts: 1,839
Joined: 6-February 03
From: Strong Beach
Member No.: 251
Region Association: None
premium is going for a premium down here right now, almost 2.50/gal. (IMG:style_emoticons/default/fighting19.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ArtechnikA
post Sep 8 2003, 07:26 PM
Post #24


rich herzog
*****

Group: Members
Posts: 7,390
Joined: 4-April 03
From: Salted Roads, PA
Member No.: 513
Region Association: None
QUOTE(Bleyseng @ Sep 8 2003, 04:05 PM)
Hmm, thats not what I have read before. DD posted a bunch of stuff before of how the ratings are different and how to translate them for todays fuel.

plus or minus a little, add 5 to the (RON+MON)/2 (US pump number)to see the ROZ number called for in the owner's manual.

early 1,7's had an 8,7:1 compression ratio (IIRC) -- later cars had less (!).

my car's owner's manual calls for premium and that's what i'm using.

the left side loves it, the right side hates it, my guess is there's something else going in ...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Sep 8 2003, 07:43 PM
Post #25


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
I dunno why it so different for everyone else. I've had at least one 914 since 82, and this has always been my experience, except for carbs, oh... and I don't remember the 1.8.



M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Sep 8 2003, 07:45 PM
Post #26


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
according to PP spec sheet, my 2.0 should be running 91 RON. It does run noticeabley smoother with the premium. Occasionally I add in the 104 octane boost. Combined with electronic ignition and wider gap, there is a peppier response.
http://www.pelicanparts.com/914/technical_..._tech_specs.htm

I ain't no major mechanic but have worked my way through a number of issues that have come up with my car. I thank my local porsche mechanic (a former (IMG:style_emoticons/default/smilie_flagge24.gif) 914 racer) and some of the guys here and on PP and Rennlist for insight. (IMG:style_emoticons/default/pray.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
kdfoust
post Sep 8 2003, 08:04 PM
Post #27


Senior Member
***

Group: Members
Posts: 694
Joined: 2-January 03
From: Riverside
Member No.: 71
Region Association: Southern California
I put prem in my 72 1.7. Never tried regular or medium (what's the middle grade called anyway?). I've been assuming that the engine would detonate it's self to pieces on regular.

Here's a piece for the puzzle: I used to have a '97 F150 which ran "better" on premium but got worse fuel economy. I repeated the experiment over and over switching between reg and prem. Reg~16 Prem~13. I always assumed that the engine controls ran the timing with more advance (less propensity to knock with prem) on premium thus yielding slightly better performance but worse mileage. I wasn't really "into" the truck so I never bothered to investigate the engine control system to verify that idea. How's that apply here? Simplistically would you set the timing slightly retrograde from the spec if you want (insist) to run reg - right?

Have fun,
Kevin
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Sep 8 2003, 08:08 PM
Post #28


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
87 plain old pump gas is roughly 92 RON.

So..

(IMG:style_emoticons/default/smile.gif)


M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Sep 8 2003, 08:12 PM
Post #29


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
Wish they had 100 here in WA at the regular pumps (IMG:style_emoticons/default/ph34r.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
seanery
post Sep 8 2003, 08:13 PM
Post #30


waiting to rebuild whitey!
***************

Group: Retired Admin
Posts: 15,854
Joined: 7-January 03
From: Indy
Member No.: 100
Region Association: None
I'm gonna hijack a little here:

Will there be a benefit to run premium 92 or race gas 100 in my car's configuration?
2.0 Euro Pistons/Cyls
webcam 494
weber 40's
SSI's
triad
compression bumped to 9-9.5 to 1

Thanks.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Sep 8 2003, 08:14 PM
Post #31


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
QUOTE(redshift @ Sep 8 2003, 06:08 PM)
87 plain old pump gas is roughly 92 RON.

So..

(IMG:style_emoticons/default/smile.gif)


M

So it should work fine according to the specs eh?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Sep 8 2003, 08:15 PM
Post #32


Resident German
*************************

Group: Admin
Posts: 41,716
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
now if i understand the whole thing right (which i might not) then using higher octane rated fuel WITHOUT any engine modifications that increase compression, is a complete waste of money.

the higher the octane number, the more you can compress the gas before it ignites itself (pre-detonation, VERY bad for your car).
but, if you have a stock 1.7 that was rated for 91 from the factory, filling it up with 98 is not going to do you any good. it might even hurt the engine.

going over 100 or using race-gas in a 7.3:1 engine SHOULD NOT make it run better.
anyone?

Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Sep 8 2003, 08:19 PM
Post #33


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
Kevin, your 72 an early one? Spec is 93 octane.

Andy (IMG:style_emoticons/default/aktion035.gif) you freak.. Nope.




M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Sep 8 2003, 08:22 PM
Post #34


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
QUOTE(p914 @ Sep 8 2003, 10:14 PM)
So it should work fine according to the specs eh?

It *is* spec.

(IMG:style_emoticons/default/idea.gif)

The 1.7 I burned to the ground was running 92 octane


M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Sep 8 2003, 08:28 PM
Post #35


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
QUOTE(redshift @ Sep 8 2003, 06:22 PM)
QUOTE(p914 @ Sep 8 2003, 10:14 PM)
So it should work fine according to the specs eh?

It *is* spec.

(IMG:style_emoticons/default/idea.gif)

The 1.7 I burned to the ground was running 92 octane


M

(IMG:style_emoticons/default/pray.gif) ahhhhhsooooo redshiftsan.

so you are saying that regular should run fine? but you went ahead and burned premium (IMG:style_emoticons/default/aktion035.gif)


Yes...*spec*
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Sep 8 2003, 08:53 PM
Post #36


Aircooled Baby!
**********

Group: Members
Posts: 13,035
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
here is the compression ratio chart for all the years


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Drums66
post Sep 8 2003, 11:05 PM
Post #37


914 Rudiments
*****

Group: Members
Posts: 5,321
Joined: 15-January 03
From: Coronado,Cali
Member No.: 151
Region Association: Southwest Region
QUOTE(redshift @ Sep 8 2003, 03:04 PM)
Look in your owners manual.

(IMG:style_emoticons/default/smilie_pokal.gif)




M

I agree with this! (IMG:style_emoticons/default/boldblue.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Sep 9 2003, 06:09 AM
Post #38


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
No, the 1.7 that burned was spec'ed for 98 RON.

(IMG:style_emoticons/default/blink.gif)


M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V < 1 2
Reply to this topicStart new topic
2 User(s) are reading this topic (2 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 4th July 2024 - 12:45 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...