2005 Mazda rx-8 GAS!!!
03-19-2011, 04:11 AM
#28
I HATE SPEEDBUMPS!
i just got an 05 rx8, and i was wondering what kind of gas. My dad workds for a dealereship and they said that you can have 87 gas??? I thought you are only suppose to use like 89( premium or unleaded) but they kept on saying they have been using 87. Im pretty sure that you can only use unleaded... ANYONE HAVE A GOOD ANSWER PLEASE!!!!
Thank you.
Thank you.
Enough of this chit chat. Just ride a bike, your not gonna have this problem
03-19-2011, 08:16 AM
#29
Surf Hard, Drive Hard
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That's out of the manual on an S2 right Jason?
Wasn't quite that explicit in the S1 manual. It recommends Premium in the S1, but doesn't go a far as this. See the paste in the above by Nubo.......... https://www.rx8club.com/showthread.p...17701#poststop
I was gonna paste it in, but he did it after you wrote this one.
My guess is that the OP is just 16 or so, their first car, mommy and daddy bought it, and they are clueless.
Wasn't quite that explicit in the S1 manual. It recommends Premium in the S1, but doesn't go a far as this. See the paste in the above by Nubo.......... https://www.rx8club.com/showthread.p...17701#poststop
I was gonna paste it in, but he did it after you wrote this one.
My guess is that the OP is just 16 or so, their first car, mommy and daddy bought it, and they are clueless.
03-19-2011, 01:55 PM
#33
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i just don't understand why someone wouldnt spend the extra like $2.60 total for better gas?
13 gallons x $3.94 (93 octane) = $51.22
13 gallons x $3.74 (87 octane) = $48.62
---------
$2.60
those are gas prices per gallon where i live right now. I went by 13 gallons because thats how much my 8 takes when the fuel light pops on approximately. Maybe your parents can loan you the extra $2.60 cents so you can put in premium?
13 gallons x $3.94 (93 octane) = $51.22
13 gallons x $3.74 (87 octane) = $48.62
---------
$2.60
those are gas prices per gallon where i live right now. I went by 13 gallons because thats how much my 8 takes when the fuel light pops on approximately. Maybe your parents can loan you the extra $2.60 cents so you can put in premium?
03-19-2011, 04:47 PM
#34
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i just don't understand why someone wouldnt spend the extra like $2.60 total for better gas?
13 gallons x $3.94 (93 octane) = $51.22
13 gallons x $3.74 (87 octane) = $48.62
---------
$2.60
those are gas prices per gallon where i live right now. I went by 13 gallons because thats how much my 8 takes when the fuel light pops on approximately. Maybe your parents can loan you the extra $2.60 cents so you can put in premium?
13 gallons x $3.94 (93 octane) = $51.22
13 gallons x $3.74 (87 octane) = $48.62
---------
$2.60
those are gas prices per gallon where i live right now. I went by 13 gallons because thats how much my 8 takes when the fuel light pops on approximately. Maybe your parents can loan you the extra $2.60 cents so you can put in premium?
03-19-2011, 05:25 PM
#35
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i just don't understand why someone wouldnt spend the extra like $2.60 total for better gas?
13 gallons x $3.94 (93 octane) = $51.22
13 gallons x $3.74 (87 octane) = $48.62
---------
$2.60
those are gas prices per gallon where i live right now. I went by 13 gallons because thats how much my 8 takes when the fuel light pops on approximately. Maybe your parents can loan you the extra $2.60 cents so you can put in premium?
13 gallons x $3.94 (93 octane) = $51.22
13 gallons x $3.74 (87 octane) = $48.62
---------
$2.60
those are gas prices per gallon where i live right now. I went by 13 gallons because thats how much my 8 takes when the fuel light pops on approximately. Maybe your parents can loan you the extra $2.60 cents so you can put in premium?
its like buying tools make in China. they might be half as expensive than those made in USA, but if they break three times as fast you not saving any money.
03-21-2011, 05:16 PM
#38
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also you havent considered how poorly the engine runs on 87. people just care about how much they pay but dont care about how many miles they get out of per tank.
its like buying tools make in China. they might be half as expensive than those made in USA, but if they break three times as fast you not saving any money.
its like buying tools make in China. they might be half as expensive than those made in USA, but if they break three times as fast you not saving any money.
Octane is not the same as energy density.
And the engine does not "run poorly" on 87. There is a *potential* decrease in power which *might* occur if you're really pushing it and the ECM has to pull timing advance. Not an issue for most street driving. If I tracked the car I'd put in premium gas.
Last edited by Nubo; 03-21-2011 at 05:23 PM.
here's some gas, no charge!
03-22-2011, 08:50 AM
#40
also you havent considered how poorly the engine runs on 87. people just care about how much they pay but dont care about how many miles they get out of per tank.
its like buying tools make in China. they might be half as expensive than those made in USA, but if they break three times as fast you not saving any money.
its like buying tools make in China. they might be half as expensive than those made in USA, but if they break three times as fast you not saving any money.
Higher octane is not a "better fuel" it is only more resistant to knock. If you have no knock issues then you are fine. I have run 87 octane in my 05 car for the last 6 years with out issue. I have tested high octane and have seen no fuel mileage improvement and even recorded a slight drop in MPG. I have detected no noticeable improvement with higher octane. by the way the 05 manual states that it is fine to use 87.
So if you have knock issues then run the higher octant, if not you're dumping money out the tail pipe. This money would be far better spent decarbonizing your engine once a year. By using the lower octane I have saved $873 over the last 6 years. That has covered the cost of my RaceBeat CAT back exhaust and 2 new tires.
Now it is a free country and if using a higher octane makes you sleep better at night, knock yourself out but, for myself I'll stick with my 87 octane and spend my saved money on mods rather then give it to the oil companies.
03-22-2011, 11:26 AM
#41
Seriously.. FML..
Everyone I open the gas cap, I still have that sticker saying premium gas only. I won't say anything to the OP because the last owner of that car probably took it off. But no way.. No way he's serious.
btw, our 8's also use banana peels and beer cans and little paper garbage as fuel. At least mine does.
btw, our 8's also use banana peels and beer cans and little paper garbage as fuel. At least mine does.
03-22-2011, 11:49 AM
#43
Acturally it is well understood that the rotary does run better with lower octane fuel. Because of the design of the combustion chamber, long and thin, a quicker burning fuel(low octane) is highly desirable. Many rotary race engines run very low octane fuel.
Higher octane is not a "better fuel" it is only more resistant to knock. If you have no knock issues then you are fine. I have run 87 octane in my 05 car for the last 6 years with out issue. I have tested high octane and have seen no fuel mileage improvement and even recorded a slight drop in MPG. I have detected no noticeable improvement with higher octane. by the way the 05 manual states that it is fine to use 87.
So if you have knock issues then run the higher octant, if not you're dumping money out the tail pipe. This money would be far better spent decarbonizing your engine once a year. By using the lower octane I have saved $873 over the last 6 years. That has covered the cost of my RaceBeat CAT back exhaust and 2 new tires.
Now it is a free country and if using a higher octane makes you sleep better at night, knock yourself out but, for myself I'll stick with my 87 octane and spend my saved money on mods rather then give it to the oil companies.
Higher octane is not a "better fuel" it is only more resistant to knock. If you have no knock issues then you are fine. I have run 87 octane in my 05 car for the last 6 years with out issue. I have tested high octane and have seen no fuel mileage improvement and even recorded a slight drop in MPG. I have detected no noticeable improvement with higher octane. by the way the 05 manual states that it is fine to use 87.
So if you have knock issues then run the higher octant, if not you're dumping money out the tail pipe. This money would be far better spent decarbonizing your engine once a year. By using the lower octane I have saved $873 over the last 6 years. That has covered the cost of my RaceBeat CAT back exhaust and 2 new tires.
Now it is a free country and if using a higher octane makes you sleep better at night, knock yourself out but, for myself I'll stick with my 87 octane and spend my saved money on mods rather then give it to the oil companies.
So your going to buy a sports car (that recommends +91), use cheaper gas that hurts performance (according to the manual), so you can save money ($3.00 at the most per fill up, and that's only if you somehow get better mpg) to buy mods......
Let's say you fill up once a week. You save $156 a year, thats not enough to buy anything to "mod" the car. And that entire year you had less performance cause you used 87 instead of +91....
What's the point? What am I missing here? It doesn't make sence to me....
-Shawn
03-22-2011, 12:25 PM
#44
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The reason to run 91 is for the fuel system. 91 will keep your injectors cleaner and you will get a cleaner burn on your plugs because of the additives. i consistently see about 220 to 240 miles before my light comes on. i only use 91 because it runs cleaner. on average i see 17 to 19 MPG city and 20 to 21 MPG freeway. BUT last time i was in Canada i filled up with 94 and saw 24 MPG. i have 130K on my 05' all freeway and MPG is mostly in how you drive but the higher octane does run cleaner and i have seen increased MPG on higher octane fuel.
My 05' reads Premium only in my manual. Weird.
My 05' reads Premium only in my manual. Weird.
Last edited by josh95mx; 03-22-2011 at 12:29 PM.
03-22-2011, 01:48 PM
#45
don't most "rotary race engines" run lower compression for boost?
So your going to buy a sports car (that recommends +91), use cheaper gas that hurts performance (according to the manual), so you can save money ($3.00 at the most per fill up, and that's only if you somehow get better mpg) to buy mods......
Let's say you fill up once a week. You save $156 a year, thats not enough to buy anything to "mod" the car. And that entire year you had less performance cause you used 87 instead of +91....
What's the point? What am I missing here? It doesn't make sense to me....
-Shawn
So your going to buy a sports car (that recommends +91), use cheaper gas that hurts performance (according to the manual), so you can save money ($3.00 at the most per fill up, and that's only if you somehow get better mpg) to buy mods......
Let's say you fill up once a week. You save $156 a year, thats not enough to buy anything to "mod" the car. And that entire year you had less performance cause you used 87 instead of +91....
What's the point? What am I missing here? It doesn't make sense to me....
-Shawn
I have ran extensively with high and low octane fuel and have seen no performance differences between them, so your point about "hurts performance issue" is moot. Now the fact that you muse "some how get better MPG" show you don't understand the dynamics of a rotary engine in regards to octane and the advantages of low octane in the combustion processes, would you say this is a fair assessment?
$156 over 6 years is not enough to mod a car??? My calculation of your number over the time frame I stated would put that at $936. So you can't find any type of mods for $936. Interesting, perhaps you need to find a new supplier. By the way I use the mod example to show what could be done with the money over time if one did not throw it away and state "it's only $3 a fill up."
The point is why would I spend more money for the same performance and slightly worst mileage buying a higher octane when my car does not require it. This should clear up what you are missing.
03-22-2011, 04:30 PM
#46
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You cant really argue about mileage though. What if Raptor uses 5w20 oil and the guy with premium uses 10-or-15w40, I would say raptor is going to be getting the better mileage then. There is more that goes into mileage than just your gas choice.
I don't know if there is a significant change in mileage with the different oils but I do know mileage gets worse by some amount with a heavier oil.
Oh and I also use premium, I would trust the manual printed in 2009 rather than the one printed in 2004 but maybe that's just me.
I don't know if there is a significant change in mileage with the different oils but I do know mileage gets worse by some amount with a heavier oil.
Oh and I also use premium, I would trust the manual printed in 2009 rather than the one printed in 2004 but maybe that's just me.
03-22-2011, 04:41 PM
#47
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All I know is I run 93 octane and have gotten over 21MPG for the 5k miles I have owned my car. If i drive nothing but freeway it goes up to 23+
And yes my 06 has it right on the fuel door "Premium Unleaded Fuel Only" and in the manual. Seems silly to not use the fuel that the people who spent millions designing / building / testing the engine recommend.
And yes my 06 has it right on the fuel door "Premium Unleaded Fuel Only" and in the manual. Seems silly to not use the fuel that the people who spent millions designing / building / testing the engine recommend.
03-22-2011, 05:40 PM
#48
...lower compression for boost???? Are you talking FI here? All FI engines run stronger with a lower compression because more air/fuel can enter the combustion chamber this is the same for piston or rotary and has no bearing with the discussion.
I have ran extensively with high and low octane fuel and have seen no performance differences between them, so your point about "hurts performance issue" is moot. Now the fact that you muse "some how get better MPG" show you don't understand the dynamics of a rotary engine in regards to octane and the advantages of low octane in the combustion processes, would you say this is a fair assessment?
$156 over 6 years is not enough to mod a car??? My calculation of your number over the time frame I stated would put that at $936. So you can't find any type of mods for $936. Interesting, perhaps you need to find a new supplier. By the way I use the mod example to show what could be done with the money over time if one did not throw it away and state "it's only $3 a fill up."
The point is why would I spend more money for the same performance and slightly worst mileage buying a higher octane when my car does not require it. This should clear up what you are missing.
I have ran extensively with high and low octane fuel and have seen no performance differences between them, so your point about "hurts performance issue" is moot. Now the fact that you muse "some how get better MPG" show you don't understand the dynamics of a rotary engine in regards to octane and the advantages of low octane in the combustion processes, would you say this is a fair assessment?
$156 over 6 years is not enough to mod a car??? My calculation of your number over the time frame I stated would put that at $936. So you can't find any type of mods for $936. Interesting, perhaps you need to find a new supplier. By the way I use the mod example to show what could be done with the money over time if one did not throw it away and state "it's only $3 a fill up."
The point is why would I spend more money for the same performance and slightly worst mileage buying a higher octane when my car does not require it. This should clear up what you are missing.
I just think it's silly to risk a investment to save $3 a week.
I know you said other things but my home network is still down... So I'm not going to try to reedit my post.
-Shawn
03-22-2011, 05:58 PM
#49
All I know is I run 93 octane and have gotten over 21MPG for the 5k miles I have owned my car. If i drive nothing but freeway it goes up to 23+
And yes my 06 has it right on the fuel door "Premium Unleaded Fuel Only" and in the manual. Seems silly to not use the fuel that the people who spent millions designing / building / testing the engine recommend.
And yes my 06 has it right on the fuel door "Premium Unleaded Fuel Only" and in the manual. Seems silly to not use the fuel that the people who spent millions designing / building / testing the engine recommend.
The easiest way for Mazda to try and prevent the failure from knock was to issue a blanket statement that all RX-8s need to run premium fuel. Rather then address the cause they put out this band aid which basically was free for them to do but will cost you and me money. Now this is good advise for people in hot dry climates and seeing that most RX owners will never de-carbon their engines it is a good safety net.
Now if your car is not knocking and you are in climates that are not super hot and dry this becomes much less an issue. So the choice is yours but don't blindly believe Mazda is making these recommendations for the cars performance. This call was made to try and save the company from replacing some motors while under warranty.
03-22-2011, 06:18 PM
#50
"Many serious rotary racers bring their own low octane gasoline to tracks that supply only racing gasoline. From "How to Modify Your Mazda RX-7", by Dave Emanuel and Jim Downing, HP Books, 1987, ISBN 0-89586-383-9, p 47-8:
". . . the best results are obtained with conservative spark-lead calibrations provided the engine is fed a diet of low-octane fuel. The fact that both 1985 and 1986 IMSA Camel Lights championships were won with low-octane fuel is a rather definitive statement . . . ."
So if you want best performance from your NA rotary, you want lowest octane. The lower cost of it is a nice bonus."
http://www.turborx7.com/faqs.htm
". . . the best results are obtained with conservative spark-lead calibrations provided the engine is fed a diet of low-octane fuel. The fact that both 1985 and 1986 IMSA Camel Lights championships were won with low-octane fuel is a rather definitive statement . . . ."
So if you want best performance from your NA rotary, you want lowest octane. The lower cost of it is a nice bonus."
http://www.turborx7.com/faqs.htm