Porsche 944 The Porsche 944 and 944 Turbo was a huge success for Porsche throughout the 1980s.

hi-test vs regular in NA car

  #1  
Old 02-09-2010, 09:17 PM
Member
Thread Starter
Join Date: Jun 2007
Location:
Posts: 59
Default hi-test vs regular in NA car

Started using a little higher octane gas this summer after my mechanic seemed insulted I had been using only regular.. have to admit does give performance a little boost - am wonderig what any downsides might be. I tend to think it has a cleaning affect on fuel/combustion sytem. Any input/comments appreciated.
 
  #2  
Old 02-10-2010, 12:05 AM
Member
Join Date: May 2007
Posts: 78
Default

From what I know, unless you advance your timings like with a chip or some kind of adjustable cam, then getting higher Octane gas won't do anything. I'm running the same car as you 86 944 I got a 93 octane chip from http://www.maxhpkit.com/ and did notice some nice improvements, but I mean its not a miracle or anything. Probably not worth the 200 bucks, but it is fun, so your choice. Other than setting your computer up with something designed to run with higher octane your just tossing your money away. Also higher Octane does not necessarily equal higher performance.

Cheers.
 
  #3  
Old 02-11-2010, 12:56 PM
Senior Member
Join Date: Jul 2005
Location:
Posts: 936
Default

There is no downside at all to using high-octane fuel you obtain from a gasoline station. But on a car that does not specifically require premiu octance fuel (it will be listed in the owners manual and in the fuel filler door, etc., you might be throwing a little money away because regular runs just fine. But you don't know unless you try. It pays to at least try it and see, as was your case. In general, in any older performance car, I would use only premium. Carbon build up over the years can raise compression ratio slightly, requiring more octane, timing may be set a little advanced, you don't know, and older cars do not have the smart electronics that limit damage if octance is too low.

Using very high octance racing fuels might causes problems because they do not have additives street engines need for durability.

The cleaning effect is real. But cleaners are also in lower octane fuels, too. And it is not really a "cleaner" that will make a lot of progress if you have injectors and other problems that are already deteriorated - think of it as additives that prevent things from getting dirtier.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Kingshawn1234
Porsche Cayenne
0
09-20-2008 03:21 AM
UT_Evo
Private 'Wanted' Classifieds
1
06-07-2007 10:02 AM
IaMtHeRuThLeSs1
Off Topic
0
10-21-2004 03:35 AM
IaMtHeRuThLeSs1
Off Topic
0
10-21-2004 03:27 AM
ninefiftyone
Porsche 944
0
06-17-2004 08:22 PM


Thread Tools
Search this Thread
Quick Reply: hi-test vs regular in NA car


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.