Project: Ultimate DIY High MPG Commuter
#61
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I am going to try and use an old FD Trust muffler that my FD came with... It fits just about perfect... but it's super old and sounds like there is a bunch of acorns rolling around inside.
My exhaust system will be 3" all the way out with V-bands and consist of a Down pipe --> Mid pipe(ends right before diff) ---> Exit
The mid pipe will be straight all the way back so that I can easily add any other thing in the future (resonator/cutout w/e). Then basically a little pig-tail twirly exit with a muffler.
Any experience with a Jones?
I am noob at muffler brands. I've only ever heard of Magnaflow, Monsterflow, and Flowmaster. Haha
![Noob](https://www.miataturbo.net/images/smilies/noob.gif)
#62
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Ended up going with a Jones muffler from Summit. I had a 3" turn down I bought from autozone probably 5 years ago... so I made some pie cuts and turned it out 90*.
I was able to stick to the exhaust being a 3 piece like I wanted to make.
The middle section is completely straight so adding in a flex piece or resonator at some point is an easy task.
![](https://www.miataturbo.net/attachments/build-threads-57/129141-project-ultimate-diy-high-mpg-commuter-20141126_235647_zpsm73o76uw.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129142-project-ultimate-diy-high-mpg-commuter-20141204_154903_zpsvyee6zfw.jpg?dateline=1418347117)
Ground clearance... tucked under frame rails.
![](https://www.miataturbo.net/attachments/build-threads-57/129143-project-ultimate-diy-high-mpg-commuter-20141126_235707_zps4ahvqy7g.jpg?dateline=1418347117)
Made the final piece today. The exit. Hangars are always a pain for me to eyeball just right, but I was able to do it perfectly this time.
![](https://www.miataturbo.net/attachments/build-threads-57/129144-project-ultimate-diy-high-mpg-commuter-20141211_164908_zpsuspgfbea.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129145-project-ultimate-diy-high-mpg-commuter-20141211_170532_zpsbfer9wgy.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129146-project-ultimate-diy-high-mpg-commuter-20141211_164858_zps0h1ys6vs.jpg?dateline=1418347117)
This pic makes it look not centered, but it's just the angle of the camera.
![](https://www.miataturbo.net/attachments/build-threads-57/129147-project-ultimate-diy-high-mpg-commuter-20141211_174248_zps0hqc2yjk.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129148-project-ultimate-diy-high-mpg-commuter-20141211_174319_zps8tbyvpsk.jpg?dateline=1418347117)
So after starting it up, I can REALLY hear the exhaust leak in the engine bay now. Unfortunately it looks to be cylinder 1 manifold flange to the head. I am slowly tightening down the nuts to hopefully seal it up, but I worry I am going to shear a stud.
****!
The last thing I want to do is take off the entire exhaust manifold again... If I do that, I might as well make a non-log style manifold and start over.
All I want to do is start tuning with the MS3 and driving
I was able to stick to the exhaust being a 3 piece like I wanted to make.
The middle section is completely straight so adding in a flex piece or resonator at some point is an easy task.
![](https://www.miataturbo.net/attachments/build-threads-57/129141-project-ultimate-diy-high-mpg-commuter-20141126_235647_zpsm73o76uw.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129142-project-ultimate-diy-high-mpg-commuter-20141204_154903_zpsvyee6zfw.jpg?dateline=1418347117)
Ground clearance... tucked under frame rails.
![](https://www.miataturbo.net/attachments/build-threads-57/129143-project-ultimate-diy-high-mpg-commuter-20141126_235707_zps4ahvqy7g.jpg?dateline=1418347117)
Made the final piece today. The exit. Hangars are always a pain for me to eyeball just right, but I was able to do it perfectly this time.
![](https://www.miataturbo.net/attachments/build-threads-57/129144-project-ultimate-diy-high-mpg-commuter-20141211_164908_zpsuspgfbea.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129145-project-ultimate-diy-high-mpg-commuter-20141211_170532_zpsbfer9wgy.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129146-project-ultimate-diy-high-mpg-commuter-20141211_164858_zps0h1ys6vs.jpg?dateline=1418347117)
This pic makes it look not centered, but it's just the angle of the camera.
![](https://www.miataturbo.net/attachments/build-threads-57/129147-project-ultimate-diy-high-mpg-commuter-20141211_174248_zps0hqc2yjk.jpg?dateline=1418347117)
![](https://www.miataturbo.net/attachments/build-threads-57/129148-project-ultimate-diy-high-mpg-commuter-20141211_174319_zps8tbyvpsk.jpg?dateline=1418347117)
So after starting it up, I can REALLY hear the exhaust leak in the engine bay now. Unfortunately it looks to be cylinder 1 manifold flange to the head. I am slowly tightening down the nuts to hopefully seal it up, but I worry I am going to shear a stud.
****!
The last thing I want to do is take off the entire exhaust manifold again... If I do that, I might as well make a non-log style manifold and start over.
All I want to do is start tuning with the MS3 and driving
![Tear](https://www.miataturbo.net/images/smilies/tear.gif)
#63
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Haven't been updating this much, but plenty of work done.
My problem was that the timing gears were both off by about 1-2 teeth somehow. Now it runs good.
I have been tuning the fuel maps and idle mostly and sorting things out. I hope to take it to the autox this weekend, but damn the tires and suspension are absolutely terrible.
The car pulls surprisingly strong for only ~7psi, I am working on tuning the EBC now to run more boost with the flick of a switch.
I hope to post some datalogs and my map tonight for review.
My problem was that the timing gears were both off by about 1-2 teeth somehow. Now it runs good.
I have been tuning the fuel maps and idle mostly and sorting things out. I hope to take it to the autox this weekend, but damn the tires and suspension are absolutely terrible.
The car pulls surprisingly strong for only ~7psi, I am working on tuning the EBC now to run more boost with the flick of a switch.
I hope to post some datalogs and my map tonight for review.
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Zaphod
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10-26-2018 11:00 PM