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Turn Up the Volume! Mishimoto's Fiesta ST Cat-Back Exhaust Development
- Thread starter mishimoto1
- Start date
![[burnout]](/images/smilies/icon_smile_burnout.gif "Burnout [burnout]"){kind=icon}
Thread Starter
#69
Yes there will most likely be a pre-sale once we near the end of the development process. We do suggest checking with one of our Mishimoto authorized vendors if you are an international customer as they may be able to get our product to you at a better shipping rate. Once the product is available for sale of course. Through a vendor it may take a bit longer to get to you but it may be a better alternative to international shipping costs. Let me know if you need any additional information on this.
-Sara
-Sara
Thread Starter
#74
In our last post we took a good look at the stock Fiesta ST exhaust and the initial design of our cat-back exhaust. The exhaust was fabricated and installed on the car and then it was time to test the stock system.
Getting ready to test some Fiesta ST parts
To Resonate or Not to Resonate
Getting the sound just right was quite a process. Our initial prototype featured 2.5? piping with a single rear muffler. This design did not feature a resonated mid-pipe unlike the stock unit. The initial design was sound tested on the dyno and also test driven by several members of the team. While we loved the low growl of the exhaust as it was, we wanted to test a resonated version before settling on a final design. As with all exhaust development projects, we are aiming for a final product that sounds great on throttle while still being volume friendly to daily driven Fiestas. So we set out to test both a resonated and non-resonated option.
Resonated and non-resonated Fiesta ST exhaust
Resonated and non-resonated Fiesta ST exhaust
First we needed to create a resonated pipe in order to test both versions of the exhaust. We cut out the center of the portion of our exhaust piping and added a bolt-in resonator section for testing. We kept the original section of pipe and added clamps to make this section bolt-in as well. This allowed us to test the exhaust with and without the resonator relatively quickly. The tests that were conducted were purely for sound purposes as we would test the winner more thoroughly later.
Fiesta ST exhaust with resonator
Fiesta ST exhaust without resonator
Fiesta ST exhaust with resonator
Sound Testing
Once we had the resonated and non-resonated pipes ready for testing, we hit the streets to let both versions of the exhaust plead their case. There was great debate throughout the office as to whether the Fiesta sounded better wild and free of a resonator, or whether a tamed resonated version was the way to go for a subtle hum. Many weighed in on this important matter, sides were chosen, and we eventually came to a conclusion. Drumroll, please!
Getting ready for Fiesta ST parts testing
Our final design will feature a non-resonated single muffler setup as seen in our initial prototype. We found that adding a resonator made the exhaust too quiet, with sound that resembled that of the stock exhaust. As enthusiasts we want to hear our vehicle roar, so we let the Fiesta be heard! As promised, here is a clip of some behind-the-scenes road testing of the exhaust. Check it out below!
[video=youtube;2vD1ka7abdg]https://www.youtube.com/watch?v=2vD1ka7abdg&feature=youtu.be[/video]
On the Dyno
After we were certain of our exhaust design, we tested the exhaust on the dyno with the stock downpipe. As expected, we saw no power gains with the exhaust alone. Still, the larger piping featured in our exhaust will allow for more flow and set us up for power gains with the addition of other modifications.
Fiesta ST exhaust testing
Coming Up!
Now that we have chosen an exhaust style, we are going to concentrate on choosing tips and getting this exhaust ready to sample! Stay tuned for more updates on this as well as other Fiesta ST parts!
We thrive on your feedback and love to hear from you on the development of our Fiesta ST parts. Let your voice be heard and vote on the tips you would like to see on the Fiesta ST exhaust!
Vote HERE!
Thanks for Reading!
-Sara
Getting ready to test some Fiesta ST parts
To Resonate or Not to Resonate
Getting the sound just right was quite a process. Our initial prototype featured 2.5? piping with a single rear muffler. This design did not feature a resonated mid-pipe unlike the stock unit. The initial design was sound tested on the dyno and also test driven by several members of the team. While we loved the low growl of the exhaust as it was, we wanted to test a resonated version before settling on a final design. As with all exhaust development projects, we are aiming for a final product that sounds great on throttle while still being volume friendly to daily driven Fiestas. So we set out to test both a resonated and non-resonated option.
Resonated and non-resonated Fiesta ST exhaust
Resonated and non-resonated Fiesta ST exhaust
First we needed to create a resonated pipe in order to test both versions of the exhaust. We cut out the center of the portion of our exhaust piping and added a bolt-in resonator section for testing. We kept the original section of pipe and added clamps to make this section bolt-in as well. This allowed us to test the exhaust with and without the resonator relatively quickly. The tests that were conducted were purely for sound purposes as we would test the winner more thoroughly later.
Fiesta ST exhaust with resonator
Fiesta ST exhaust without resonator
Fiesta ST exhaust with resonator
Sound Testing
Once we had the resonated and non-resonated pipes ready for testing, we hit the streets to let both versions of the exhaust plead their case. There was great debate throughout the office as to whether the Fiesta sounded better wild and free of a resonator, or whether a tamed resonated version was the way to go for a subtle hum. Many weighed in on this important matter, sides were chosen, and we eventually came to a conclusion. Drumroll, please!
Getting ready for Fiesta ST parts testing
Our final design will feature a non-resonated single muffler setup as seen in our initial prototype. We found that adding a resonator made the exhaust too quiet, with sound that resembled that of the stock exhaust. As enthusiasts we want to hear our vehicle roar, so we let the Fiesta be heard! As promised, here is a clip of some behind-the-scenes road testing of the exhaust. Check it out below!
[video=youtube;2vD1ka7abdg]https://www.youtube.com/watch?v=2vD1ka7abdg&feature=youtu.be[/video]
On the Dyno
After we were certain of our exhaust design, we tested the exhaust on the dyno with the stock downpipe. As expected, we saw no power gains with the exhaust alone. Still, the larger piping featured in our exhaust will allow for more flow and set us up for power gains with the addition of other modifications.
Fiesta ST exhaust testing
Coming Up!
Now that we have chosen an exhaust style, we are going to concentrate on choosing tips and getting this exhaust ready to sample! Stay tuned for more updates on this as well as other Fiesta ST parts!
We thrive on your feedback and love to hear from you on the development of our Fiesta ST parts. Let your voice be heard and vote on the tips you would like to see on the Fiesta ST exhaust!
Vote HERE!
Thanks for Reading!
-Sara
Thread Starter
#78
Thanks for the kind words guys!
This round of exhaust testing on the dyno was with a stock tune. We felt that this was the best way to honestly test our product without any additional factors to influence the results. We are certainly open to doing additional testing with a tune in the future, once we complete testing with some of the other products we have in the works. The exhaust was tested on the highway in normal driving situations that a daily would encounter and the non-resonated exhaust was not overly loud in that RPM range, though obviously louder than stock. We will be using the cat-back exhaust on the Fiesta ST while we are testing our downpipe setups, so you will get a chance to see how the exhaust and downpipe perform together on the dyno. Stay tuned for more coming on this and we really do appreciate your feedback!
Thanks!
-Sara
This round of exhaust testing on the dyno was with a stock tune. We felt that this was the best way to honestly test our product without any additional factors to influence the results. We are certainly open to doing additional testing with a tune in the future, once we complete testing with some of the other products we have in the works. The exhaust was tested on the highway in normal driving situations that a daily would encounter and the non-resonated exhaust was not overly loud in that RPM range, though obviously louder than stock. We will be using the cat-back exhaust on the Fiesta ST while we are testing our downpipe setups, so you will get a chance to see how the exhaust and downpipe perform together on the dyno. Stay tuned for more coming on this and we really do appreciate your feedback!
Thanks!
-Sara
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