Compare auto reliability with reliable results at TrueDelta.com!

Compare auto reliability with reliable results at TrueDelta.com!
Page 1 of 2 12 LastLast
Results 1 to 15 of 21

Thread: MS# Fuel Requirements

  1. #1
    Registered Member


    Join Date
    Aug 2007
    Posts
    9

    MS# Fuel Requirements

    I saw somewhere that the new 08 CX7 does not require Premium fuel and it is only suggested. It can be used with regular without any issues. I wonder if this is the same with the 08 MS3 and could the 07 MS3 be reflashed to use regular.

    Before anyone says, I know in the manual it says you can use regular when premium is unavailable, but switch back the next time.

    This is different. The new CX7 allows you to use regular all the time.

  2. #2
    Visionnaire

    zero-eight Speed3

    Join Date
    Sep 2007
    Location
    Sterling, 20165
    Posts
    86
    By choosing a fuel that has less octane modifies your A/F curve from what the car is programmed for.

    You may tune it at a shop to have the curves adjusted but the MS3 should be running on premium. If you can afford an MS3, you should be able to afford the gas for it.
    ///On se bat comme des Lions
    Pour une vie d'Moutons////

  3. #3
    Zed's dead baby.

    2007 Mazda Mazdaspeed3 GT

    Join Date
    Oct 2007
    Location
    Colleyville, TX
    Posts
    821
    The car can handle 89/91 octane if its what you got, but it prefers the higher stuff. Gas prices in my area are good (all things considered), so I'll suck it up and pay the 2.80-2.90 for 93.

  4. #4
    Registered Member nig3's Avatar


    Join Date
    Oct 2007
    Posts
    382
    my 08 ms3 says 93octane only. you always use a premium fuel with a turbocharged motor.

  5. #5
    hickalicious!! tsunami's Avatar
    Donated: $20

    mazda3 5 door

    Join Date
    Feb 2005
    Location
    maine
    Posts
    5,107
    the higher the octane the better the engine runs on a turbo car stop cheaping out and try to put the gas that will save you 3.60$ at every fill up... if you didn't know what you were getting into with a performance car you should have done your home work...

  6. #6
    Registered Member dread's Avatar


    Join Date
    Mar 2005
    Posts
    1,337
    I have been in Africa for 4 months and my wife has been driving my car. The car through a CEL and she didn't mention until later that she had put regular gas in the same day. I would say the regular is not good for the car. She took it to the dealer and they replace the purge control valve for the second time. Anyway moral of the story don't let your wife drive your car and don't use regular gas. She mentioned that it felt a lot slower with the regular gas as well.

  7. #7
    Banned


    Join Date
    Dec 2006
    Location
    Las Vegas
    Posts
    1,349
    I let a family member borrow my car to run up the street to get some brews, and he came back smiling, and said "I filled it up for ya!" I asked, "with what?", and he said, "Gas!" I said, "I understand, but with what octane?" A puzzled look came over his face, he thought for a minute, then he re-enacted the events at the pump with his hands, thinking which pump he grabbed. He paused, then said, "Um, Regular?" I smacked my hand to my head, and quietly murmured a few curse words, then told him, "Well, it only runs right on premium. When you were driving, you felt it had a ton of power, right?" He says "YEAH! It was a blast!" I said, "Well, that's because it is a turbo car, and it needs premium to run like that." He asked me if he broke it, and I told him "No, but I need to get that stuff out of there!" So I hopped in the car and drove around in low gears, and higher RPM and low load, until I was using 8mpg or so. About 30 minutes later I bought a thing of octane boost and refilled with 92, and called it "good for now."

    It didn't behave right for about 3 tanks after!

    Keep in mind, in Vegas it is HOT, and that heat can cause cheap gas to really wreck havoc on this engine, I've found.

  8. #8
    <0 SuperStretch18's Avatar

    '07 CX-7 Sport, Black on Black; '04 Mazda3s

    Join Date
    Mar 2007
    Location
    Miramar, FL
    Posts
    1,383
    The 08 CX-7 allows you to use regular, but the ECU takes a heavy hand in adjusting your performance to allow it. They still recommend using premium all the time! If you are going to buy a performance car, pay for the good stuff and drive to your heart's content. Assume .25 cents a gallon; fill once a week, you are looking at less than $300 for a year! It's not as big a hit on your wallet as most people think...

  9. #9
    boom boom! Sacrilicious's Avatar

    Cosmic Blue MS3 of hawtness!

    Join Date
    Sep 2007
    Location
    NoVA
    Posts
    1,348
    basically, the higher octane gasolines are needed for cars that run higher compression. since our turbocharger adds crazy compression, that means we need to run the high octane stuff, or bad things can happen. the car is smart enough to shut off boost when it detects that the engine is knocking (basically means your car won't allow you to boost when using regular gas), but it's a BAD thing that it gets to detect that knock at all. use regular gasoline if it's an emergency, but if you have any choice in the matter, go with the high grade stuff!

    there's not many "performance" cars that don't require the high grade stuff, and the only ones that don't are heavily under-utilizing the potentials of their engines. the mustang gt has a 4.6L V8 engine that only makes 300hp...THAT'S LITERALLY TWICE THE SIZE OF OUR ENGINES! >_<;

  10. #10
    Registered Member


    Join Date
    Aug 2007
    Posts
    9

    MS 3 Gas Requirements

    It is not about the money. I can afford the price difference. It is just annoying. There are many high performance cars that don't require premium gas.

    I had a 1988 Mazda 323 GTX which was turbo intercooled and 16 valve with 4wd (would be nice on the MS3) and used regular gas. It was a 1.6 liter running a peak of 11 psi. It had 132 hp, allot for the time. So turbo engines don't necessarily require premium.

  11. #11
    Registered Member


    Join Date
    Sep 2007
    Posts
    121
    Quote Originally Posted by rhan696 View Post
    It is not about the money. I can afford the price difference. It is just annoying. There are many high performance cars that don't require premium gas.

    I had a 1988 Mazda 323 GTX which was turbo intercooled and 16 valve with 4wd (would be nice on the MS3) and used regular gas. It was a 1.6 liter running a peak of 11 psi. It had 132 hp, allot for the time. So turbo engines don't necessarily require premium.
    87 Octane in 1988 was probably a little different than 87 octane now.

  12. #12
    boom boom! Sacrilicious's Avatar

    Cosmic Blue MS3 of hawtness!

    Join Date
    Sep 2007
    Location
    NoVA
    Posts
    1,348
    Quote Originally Posted by rhan696 View Post
    I had a 1988 Mazda 323 GTX which was turbo intercooled and 16 valve with 4wd (would be nice on the MS3) and used regular gas. It was a 1.6 liter running a peak of 11 psi. It had 132 hp, allot for the time. So turbo engines don't necessarily require premium.
    132hp is also done now using NA 1.6L engines running regular gas.

    quite honestly, the comparison is just not valid. by today's standards, if you're making 132hp with a 1.6L turbocharged car, you're REALLY underperforming, which means you're not running enough compression to that engine. the reason that today's engines require high octane gasoline is because they have pushed the limits of hp coming from an engine of a given displacement much farther than they did in 1988. ie: way more compression.

  13. #13
    Visionnaire

    zero-eight Speed3

    Join Date
    Sep 2007
    Location
    Sterling, 20165
    Posts
    86
    Quote Originally Posted by billyrohm View Post
    87 Octane in 1988 was probably a little different than 87 octane now.
    And we are talking about a 1.6 L.
    Sigs are visible only in your first post on a page. To change your thread display preferences, click here and enable 'Always Show Signature'.

  14. #14
    <0 SuperStretch18's Avatar

    '07 CX-7 Sport, Black on Black; '04 Mazda3s

    Join Date
    Mar 2007
    Location
    Miramar, FL
    Posts
    1,383
    The old comparison is not valid. The MS3 engine with high compression, forced induction and direct injection is a different animal than anything from 1988. As someone else said, any engine that does not require premium is leaving something on the table with regards to performance. And to say that it is not due to cost is a flop. Why would it be annoying otherwise? It's not like you have to go out of your way to get it...

  15. #15
    07 speed three dkswim's Avatar

    MAZDASPEED 3

    Join Date
    Jun 2007
    Location
    columus, GA
    Posts
    2,354
    why wouldnt you want to run premium its only 1.00 more per fillup avrage .10 more expensive times 10 gallons for fill up thats my average and rough guestemating. the cx7 is also pushing less boost now beacuse of it. dose anyone know what its hp and torque numbers are off the top of ther head ill try and find it in the next hour or soo. imagine what a tune and 100 octane or higher would do for us.

Page 1 of 2 12 LastLast

Similar Threads

  1. Aromotive FPR and perrin fuel rail
    By Wbriggs19061 in forum Mazdaspeed Protege
    Replies: 1
    Last Post: 02-18-2007, 02:05 PM
  2. C&D 10 Fun and Efficient Cars
    By mikeyb in forum Lounge
    Replies: 15
    Last Post: 12-14-2006, 05:13 PM
  3. Replies: 3
    Last Post: 05-01-2006, 09:30 AM
  4. 2003 VW Jetta SVO (Straight Vegetable Oil)
    By mikeyb in forum Lounge
    Replies: 1
    Last Post: 04-24-2006, 09:29 AM
  5. Tuning Glossary
    By Protege_Speed in forum Mazda How-To
    Replies: 3
    Last Post: 06-03-2005, 10:10 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •