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#17
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Wow, did this thread get off track.......
So how bout a little more info on things when you can (fuel econ, performance changes, etc) |
#18
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93 octane just went up to 2.65 a gallon here. I just paid 37 dollars for gas. One of the guys at the pump saw my bill and asked if i drove an SUV and i said no its not called an SUV its an SVX
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#19
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Back to the 87 octane...
Does the ECU use an external switch to select fuel grades, a la Mustang SVO, or does it need to re-learn for the lower octane?
EDIT: Answer discovered in a ANOTHER THREAD.
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'95 Subaru SVX L-AWD 88K miles. Last edited by PhatWeasel; 06-03-2004 at 04:32 PM. |
#20
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#21
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The paypal link to purchase is now there as well. |
#22
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I've run the cheap stuff for a month or so without any ill effects other than a slight loss of power. There was no pinking or hesitation of any sort. I continued to fill my tank at 330 miles as I always do, (because it runs out at 345 miles,) and it continued to guzzle the same amount of fuel at each fill up.
I decided it was worth the extra dollar per tank to have that extra get-up-and-go, so I've been back on the expensive stuff again. I think I might find a test strip somewhere and take some benchmark drag runs with different grades. Maybe I can run the middle grade without giving up any ponies. For the extra dollar, it's really not worth my time, but I'm curious so I might do it anyway. |
#23
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You might want to read the info we provided on our website about the factory tuning of the svx. You WON'T HEAR NOCK in an svx unless it's so outrageously bad that it's out of the ability of the ecu to correct for it by retarding the ignition timing. YOU WILL GET A MASSIVE LOW END PERFORMANCE LOSS from the corrective measures applied to prevent knock with the stock factory code which gets worse as your fuel grade does. Further, once you have driven the car with the wrong grade fuel without using ecu code that is propperly tuned for it performance with the higher grades of fuel is detrimented because the protective measures learned in by the ecu take much longer to learn out than they did in. If you read the website I think you will understand. Right now you are just comparing poor performance with poorer performance.
You should strongly consider taking your car to the dealer and having them clear the memory on your ecu using their select monitor. Of course, after you stop running regular unleaded on the factory code. All those premium unleaded only stickers are there for a reason. The US market cars without our chip run considerably lean especially in the low rpms which causes knock retard and performance problems even on premium unleaded. Those problems only get worse with lower octane. Your ecu undoubtedly has a lot of performance robbing adjustments learned in to prevent knock. To clear them out you must use a select monitor. Quote:
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#24
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The SVX ECU was programmed at the factory to run on high octane. A Select Monitor can erase data your car has learned since leaving the factory, but it can not erase factory programmed data! It also can not reprogram your ECU (in case anyone was wondering). Dave |
#25
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That's correct. Ideally you should install the stage 1 chip then go to the dealer and get your ecu's memory cleared using the select monitor. If you don't get your ecu's memory cleared it will relearn to match the new code but it will take longer...particularly the learned ignition retard. |
#26
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I don't doubt that what you say is true, or at least somewhat true, but I noticed an almost immediate increase in power once I switched back to the higher grade, and I believe it has completely returned to it's original map on less than one tank. Perhaps it has not, but I can't tell the difference. (It can still get from the stop sign to the red mailbox in less than 21 seconds.)
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The most valuable piece of information is exactly how long it takes. I'll put my money on less-than-a-tank. |
#27
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#28
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Logical extrapolations and real experience are a far cry from personal assumptions. It is hard to believe that Subaru would design an ECU that was so nearly incapable of unlearning a low performance map, especially one that is so competent and heavily dependent on it's knock sensors. Who has the ECU's source code? |
#29
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I don't want to force my opinion on you. I just don't aggree with what you are thinking. It happens. Maybe you're right and I'm wrong. Maybe I'm right and your wrong. Personally, since I think I'm right, I hope sometime you get the opportunity to find out I'm right and get back some of that horespower I think you're missing out on. |
#30
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We interrupt this discussion....
Michael, Any idea the going rate at the Dealer to do this "select monitor brain-wipe"? As the third owner of the car I wonder at this point what I may be missing.
Apologies for slipping into the middle of your technical vs "time to the red mailbox" debate with such a thing as a $$ question, but inquiring minds, and all that. Glenn
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"The only thing necessary for the triumph of evil is for good men to do nothing" Aaron Burke 1993 25th Anniversary Edition #63 of 301. R.I.P. Rojo 7/24/2008 She saved my life! 1997 Ebony Mica Pearl LSI. BLACKBERRY 1998 5-Spd Legacy GT Wagon in Glacier White: NUBURU 2005 Cadillac STS in Sandstorm Metallic: STORMY Veteran and farthest traveler of 1st SoCal2MuseumsMeet2010. http://www.subaru-svx.net/photos/user.php?RojoRocket |
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