better mpg
07-17-13, 11:14 PM
#1
Senior Member
Thread Starter
better mpg
Hey i was thinking about getting the new megasquirt ms3x and was wondering if i could add a hotwire maf with the map sensor etc. to increase mpg. S4 na (maybe future turbo)
07-18-13, 12:07 AM
#2
Senior Member
iTrader: (7)
Join Date: Dec 2008
Location: WNC
Posts: 603
Likes: 0
Received 0 Likes
on
0 Posts
you need to do a lot of homework.
Adding a maf will not give you mpg. It is simply a sensor the ecu uses to help determine engine load and airflow.
That being said, I'm on MS2. I get 18 city, and 23 highway ( I think that's pretty much n/a window sticker). Turbo car though. You can do it.
Adding a maf will not give you mpg. It is simply a sensor the ecu uses to help determine engine load and airflow.
That being said, I'm on MS2. I get 18 city, and 23 highway ( I think that's pretty much n/a window sticker). Turbo car though. You can do it.
07-18-13, 05:35 AM
#3
Junior Member
Join Date: Jul 2013
Location: Massachusetts
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
I'd have to agree. Doesn't seem like RX7 was meant for good gas mileage. My car seems very off and on. There's no in between or partial throttle. Even when the pedal is partial the throttle is off or on. And it seems like the tranny causes just enough resistance to slow down the car rather than idle comfortably. I think MPG is just something you give up for not owning a Honda. I'm not mad about it. LoL
Trending Topics
07-18-13, 01:43 PM
#8
bcrotary.
Join Date: Jul 2010
Location: Abbotsford, British Columbia
Posts: 513
Likes: 0
Received 1 Like
on
1 Post
15 city, 19 highway. Turbo, streetport, stock ecu. I think the culprit's a worn out O2 sensor. I'm leaning towards buying another FB because I can't stand getting 330km to a tank not even being able to enjoy the car.
07-18-13, 01:55 PM
#10
Senior Member
Thread Starter
what are you guys tuning tables?
MMoore was it tuned by a pro or did you do it yourself? ANd how much hp are you at?
I was starting to study how to tune and realized i should be able to do better than a 20somthing year old processor.
I was thinkig of using a host of new sensors and whatnot to increase mpgs considerably
MMoore was it tuned by a pro or did you do it yourself? ANd how much hp are you at?
I was starting to study how to tune and realized i should be able to do better than a 20somthing year old processor.
I was thinkig of using a host of new sensors and whatnot to increase mpgs considerably
07-18-13, 01:56 PM
#11
why would you think a MAF would net better fuel economy? it will require more tuning and net the same results as a MAP based system with less tolerance of intake system leaks. it is a step up from an AFM but MAP based systems will compensate for variations in intake system pressure/vacuum automatically.
say you blow off a few vacuum lines with a MAP based system, the only thing you will notice is lower boost due to the leaks.
say you blow off a few vacuum lines with a MAP based system, the only thing you will notice is lower boost due to the leaks.
Last edited by RotaryEvolution; 07-18-13 at 02:05 PM.
07-19-13, 12:27 AM
#12
Senior Member
iTrader: (7)
Join Date: Dec 2008
Location: WNC
Posts: 603
Likes: 0
Received 0 Likes
on
0 Posts
what are you guys tuning tables?
MMoore was it tuned by a pro or did you do it yourself? ANd how much hp are you at?
I was starting to study how to tune and realized i should be able to do better than a 20somthing year old processor.
I was thinkig of using a host of new sensors and whatnot to increase mpgs considerably
MMoore was it tuned by a pro or did you do it yourself? ANd how much hp are you at?
I was starting to study how to tune and realized i should be able to do better than a 20somthing year old processor.
I was thinkig of using a host of new sensors and whatnot to increase mpgs considerably
312Rwhp is what I was dyno'd at last April.
The hindrance isn't in the processor, it is that the tune was for the oem, Mazda had to compromise their tune for long term (read warranty length) reliability, power, and mileage.
07-19-13, 11:05 AM
#13
Senior Member
Thread Starter
why would you think a MAF would net better fuel economy? it will require more tuning and net the same results as a MAP based system with less tolerance of intake system leaks. it is a step up from an AFM but MAP based systems will compensate for variations in intake system pressure/vacuum automatically.
say you blow off a few vacuum lines with a MAP based system, the only thing you will notice is lower boost due to the leaks.
say you blow off a few vacuum lines with a MAP based system, the only thing you will notice is lower boost due to the leaks.
This is why i brought it up. But if you guy say its not necessary then ill omit it.
07-19-13, 01:51 PM
#14
MAP Sensor VS. Maf Sensor | Tuning MAP sensors | Evo Maf
This is why i brought it up. But if you guy say its not necessary then ill omit it.
This is why i brought it up. But if you guy say its not necessary then ill omit it.
doesn't really seem worth the trouble.
07-19-13, 04:44 PM
#15
the additional fine tuning aspect of the MAF sensor won't really net you much mpg in a rotary, a good tuner will get the same results from a MAP based system. the differences come in altitude changes where the MAF will compensate much more accurately where the MAP sensor will do rough corrections based on ambient pressure changes.
the intake system on these engines is also antiquated and tends to develop leaks which can be present only cold versus warm or simple get worse over time under any condition, such as the poor injector sealing techniques used in the 80's(the injectors fit sloppily into the engine and push up under boost).
the intake system on these engines is also antiquated and tends to develop leaks which can be present only cold versus warm or simple get worse over time under any condition, such as the poor injector sealing techniques used in the 80's(the injectors fit sloppily into the engine and push up under boost).
Last edited by RotaryEvolution; 07-19-13 at 04:47 PM.
07-19-13, 05:29 PM
#16
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,829
Received 2,597 Likes
on
1,845 Posts
i think if we have a preference for the MAP sensor, its because we're used to it....
07-20-13, 10:35 AM
#17
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
People shouldn't forget that Mazda was able to achieve impressive highway mileage in the "lean burn" 12A in the 70s. EPA ratings were between 30 and 35MPG. They lost that ability when they had to run richer to keep the catalysts happy.
That said, city mileage is always going to be rather disappointing just due to combustion shape.
An AFM is less important on an ECU able to run in observer mode, tightly controlling AFRs using a wideband O2 sensor. MS3 can easily do this as well as advanced model based enrichments which make an enormous difference over what the stock ECU is capable of.
That said, city mileage is always going to be rather disappointing just due to combustion shape.
An AFM is less important on an ECU able to run in observer mode, tightly controlling AFRs using a wideband O2 sensor. MS3 can easily do this as well as advanced model based enrichments which make an enormous difference over what the stock ECU is capable of.
07-22-13, 08:31 AM
#19
Gold Wheels FTW
This... My old large streetport na s5 made about 7mpg city.... If you're looking for mpg in a rotary, then you picked the wrong car....lol
Thread
Thread Starter
Forum
Replies
Last Post