300+ WHP Fiesta ST

[Rysiin]

What would it take to get 300+ horsepower in my 2018 FiST with a Mountune MRX turbo upgrade and a COBB accessport? This car is my daily and I'd like to bring it to car meets in the future. My goals for this car is to make 300+ WHP for now. I just need some insight as to what worked for you, what didn't work, what parts I need to upgrade, etc..

 

[slopoke]

Have you installed or even purchased a larger turbo yet. If not, I'd go with a S280 from Whoosh Motorsports. Depending on your local pump gas octane, you could get close to 300. For more, a single port or four port aux fuel will get you in the mid 300s.

 

[JDG]

Have you installed or even purchased a larger turbo yet. If not, I'd go with a S280 from Whoosh Motorsports. Depending on your local pump gas octane, you could get close to 300. For more, a single port or four port aux fuel will get you in the mid 300s.

This^

If you can swing a new turbo, the S280 + aux fuel with all the supporting modicications is a good solution for 300WHP on 93 octane:

 

[Rocketst]

Would definitely need an upgraded intercooler first and foremost. The exhaust will be fine for 300hp so keep stock unless you want better notes. To name a few reliable turbos in that hp range, I believe whooshes brand name turbo is good for 300, the s280, pumaspeeds x47 if you can find a used one. Your gonna need atleast single port aux though. I say this not because it's a necessity but reliability is a key factor in what I recommend to people. Yes depending on how new your fiesta is and how well the motor was built you could possibly get 310hp out of the stock fuel system but when you do this it puts more wear on your cam tappet as well as the hpfp. By upgrading the fuel to atleast single port you will see up to 375hp but at a lower strain on the hpfp. Plus, you'll have ethanol options then as well. I would recommend a bigger breather than the stock intake. Something simple like the st200 box has been put on a number of 300+ fiestas. That's gonna be your best closest to stock option. Don't forget to throw in an uprated filter. Rmm on these cars pushing stock numbers is a necessity because it can cause damage and limit the motors full capability. I actually had my engine hit the firewall so hard I thought I broke my transmission one day as I was downshifting. I was completely stock.

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[Se7eN]

What would it take to get 300+ horsepower in my 2018 FiST with a Mountune MRX turbo upgrade and a COBB accessport? This car is my daily and I'd like to bring it to car meets in the future. My goals for this car is to make 300+ WHP for now. I just need some insight as to what worked for you, what didn't work, what parts I need to upgrade, etc..

I currently have 300+ with my MRX, Pump gas tune is 280whp with very bad gasoline, with E40-50 mix (I say this cause I don't have the Ethanol meter yet) it has made 329whp soon to make a little more as I had throttle closure issue.

It is my daily and has 55k miles on it already. Had the turbo for about 2 years on the car.

 

[Se7eN]

Also, what other have said is sort off true. A good S280 or Whoosh Hybrid will give you better spool and same or more power with the same sort of mods. Although my results were on a real dyno on a 80 degree day I'd say take Vdyno readings with a grain of salt. Results may vary depending on where you're at and temp.

 

[Rysiin]

This^

If you can swing a new turbo, the S280 + aux fuel with all the supporting modicications is a good solution for 300WHP on 93 octane:

View attachment 28204

So I didn't mention the fact that I have a cobb intercooler in the car already as well as an air filter, piping, and downpipe just for the fact that if i were to upgrade to a certain turbo, I would like to hear what parts work best/compatible for that turbo. I have 91 octane as well as E85. There are others but an extra 20 minute drive is not very economic I guess. The car was actually my buddies and it has less than 12000 miles on it and the aftermarket parts have maybe 4-5000 miles put on them. The car is basically new to me. He works at a Ford dealership as a master tech so he kept it in excellent condition. He recommended the Mountune MRX turbo. I live in Minnesota so top temps are in the 90s but not often. Usual temps are 70s-80s in the summer, then obviously tits cold in the winter. Aside from that, when it comes to single port or four port aux, what would you recommend? And what are the differences that you have noticed between whooshes s280 and the MRX turbos?

 

[MRX430]

Keep the MRX and get 4 port. On E50 I made 296 hp on a Mustang dyno. It’s a great turbo.

 

[Se7eN]

Aside from that, when it comes to single port or four port aux, what would you recommend? And what are the differences that you have noticed between whooshes s280 and the MRX turbos?

Go 4 port if you can afford it. As for turbo, it al depends on taste and what you want to have. S280 will feel more like the stocker driving around. Boost on tap, MRX will spool later but with a good tune drive-ability will be about the same. Spool will definitely be later.

 

[wetwea33]

So I didn't mention the fact that I have a cobb intercooler in the car already as well as an air filter, piping, and downpipe just for the fact that if i were to upgrade to a certain turbo, I would like to hear what parts work best/compatible for that turbo. I have 91 octane as well as E85. There are others but an extra 20 minute drive is not very economic I guess. The car was actually my buddies and it has less than 12000 miles on it and the aftermarket parts have maybe 4-5000 miles put on them. The car is basically new to me. He works at a Ford dealership as a master tech so he kept it in excellent condition. He recommended the Mountune MRX turbo. I live in Minnesota so top temps are in the 90s but not often. Usual temps are 70s-80s in the summer, then obviously tits cold in the winter. Aside from that, when it comes to single port or four port aux, what would you recommend? And what are the differences that you have noticed between whooshes s280 and the MRX turbos?

Get the s280 and get a 4 port if you can. You can run ran straight e85 or run an e50 blend along with having a 91 tune for around town. You can make close to 300 on 91 with aux and 350+ with e50/e85.

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[Rysiin]

Get the s280 and get a 4 port if you can. You can run ran straight e85 or run an e50 blend along with having a 91 tune for around town. You can make close to 300 on 91 with aux and 350+ with e50/e85.

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So, you're saying I should get the s280 and probably the stratified 4 port aux fuel kit that has its own injectors? Do I need a 3" DP for this or will a 2.5" work?

I'm liking where this is going! So with an s280, 4 port aux fuel kit, and lets say a 3" dp with aftermarket BOV, intercooler, cold air intake, what whp would I be seeing? Is there any dyno graphs out there that people have posted with similar set up? Are there any other supporting mods that I need or should get(preferably not uber expensive). But yeah, my whole goal is to make at least 300WHP on pump gas, any thing over that is a bonus(for now, until I want MOREEEE). Not a track person(although I wish there was one relatively close to me so I could be) but with this setup, is the stock engine going to be good? At what point should I upgrade the pistons?

 

[jeff]

I would really advise you to do a lot of research before aiming for a particular number. A support structure needs to be in place before or at least in conjunction with building power. If not done correctly and in a pragmatic way you are going to have a very unbalanced car in the end. From what I’ve read in this thread so far you’re looking at putting about $4000 into your car assuming you do all the install and labor yourself. Without several thousand dollars more of supporting mods in terms of tires and suspension and other things you’re going to end up with a 300 hp car that has very little practical use and does nothing more than shred your tires.

Here’s a video that details what I would consider to be a well executed strategy for this level of power, hope it helps:

View: https://m.youtube.com/watch?v=I3NtaeQZBRo

 

[wetwea33]

So, you're saying I should get the s280 and probably the stratified 4 port aux fuel kit that has its own injectors? Do I need a 3" DP for this or will a 2.5" work?

I'm liking where this is going! So with an s280, 4 port aux fuel kit, and lets say a 3" dp with aftermarket BOV, intercooler, cold air intake, what whp would I be seeing? Is there any dyno graphs out there that people have posted with similar set up? Are there any other supporting mods that I need or should get(preferably not uber expensive). But yeah, my whole goal is to make at least 300WHP on pump gas, any thing over that is a bonus(for now, until I want MOREEEE). Not a track person(although I wish there was one relatively close to me so I could be) but with this setup, is the stock engine going to be good? At what point should I upgrade the pistons?

You can get right around 300whp on 93 with this setup but that's really pushing it. These cars don't like lower octane pump gas. On e50/e85 you should be able to make 350whp+. If you have readily available e85 everywhere that's consistent I reccomened e85 so you have the option of not having to mix although your gas milage will suffer.

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[Rocketst]

So, you're saying I should get the s280 and probably the stratified 4 port aux fuel kit that has its own injectors? Do I need a 3" DP for this or will a 2.5" work?

I'm liking where this is going! So with an s280, 4 port aux fuel kit, and lets say a 3" dp with aftermarket BOV, intercooler, cold air intake, what whp would I be seeing? Is there any dyno graphs out there that people have posted with similar set up? Are there any other supporting mods that I need or should get(preferably not uber expensive). But yeah, my whole goal is to make at least 300WHP on pump gas, any thing over that is a bonus(for now, until I want MOREEEE). Not a track person(although I wish there was one relatively close to me so I could be) but with this setup, is the stock engine going to be good? At what point should I upgrade the pistons?

Upgrade pistons at 400+hp. Id also look into some truly forged rods as well considering ours are sinter forged. Still good quality but not as good as some other types. And if you do go the forged route, if your already in there might as well try to upgrade the oil system with a baffled sump. It'll ensure more oil gets drawn into the system. Also I totally agree with Jeff's video. I have 17k in my car and still don't know what it's going to tune for. I do know that I have every supporting mod I need to push that 400hp that I want though and that's where things get expensive. If you want the gains you need to do more than just a turbo swap otherwise your just gonna be spinning tires all day.

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[Ford ST]

Research research and research some more. Go over all of the setups other people have ran. How long have they ran the setup, how do they like it, pros cons, reliability concerns. Don't just chase a power number.
300 horsepower at sea level on a 68 degree cool morning is not the same as 300 horsepower at 3000 feet and a 110 degree day.
I could go on and on, but I believe you understand my point.

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[antarctica24]

What would it take to get 300+ horsepower in my 2018 FiST with a Mountune MRX turbo upgrade and a COBB accessport? This car is my daily and I'd like to bring it to car meets in the future. My goals for this car is to make 300+ WHP for now. I just need some insight as to what worked for you, what didn't work, what parts I need to upgrade, etc..

I think the piece to remember here that the others are saying, is that getting 300 is nice. But its how you get there that matters. All of the turbos being recommended are hybrids in some form or another. Not that there is anything wrong with a hybrid turbo. But all hybrid turbos have a limitation. The housing. You can only move so much air through a hybrid housing comparted to a true larger frame turbo. The MRX by itself will not make 300. And for that fact, no turbo on this car will make 300 on factory fuel. If you were thinking just running 93 depending on where you are, a single port will get you to 320 or so on the MRX. A 4 port on e30-e40 probably around 335 maybe 340. but at that point your at the top end of the MRX. If you are not where you can get 93 regularly consider meth and 93. Panda has a 4 port meth kit that will accomplish the same thing.

The MRX is going to make more power under the power curve than a hybrid and is going to hang longer than a hybrid. The Hybrid will come on a little quicker in the RPM band but will not hang as long.

To move past 300, you need a much larger turbo and more fuel. The S280 while a really nice turbo, has the same issue as the MRX, in that, it will only go so far and it limited by the housing and impeller size.

 

[wetwea33]

I think the piece to remember here that the others are saying, is that getting 300 is nice. But its how you get there that matters. All of the turbos being recommended are hybrids in some form or another. Not that there is anything wrong with a hybrid turbo. But all hybrid turbos have a limitation. The housing. You can only move so much air through a hybrid housing comparted to a true larger frame turbo. The MRX by itself will not make 300. And for that fact, no turbo on this car will make 300 on factory fuel. If you were thinking just running 93 depending on where you are, a single port will get you to 320 or so on the MRX. A 4 port on e30-e40 probably around 335 maybe 340. but at that point your at the top end of the MRX. If you are not where you can get 93 regularly consider meth and 93. Panda has a 4 port meth kit that will accomplish the same thing.

The MRX is going to make more power under the power curve than a hybrid and is going to hang longer than a hybrid. The Hybrid will come on a little quicker in the RPM band but will not hang as long.

To move past 300, you need a much larger turbo and more fuel. The S280 while a really nice turbo, has the same issue as the MRX, in that, it will only go so far and it limited by the housing and impeller size.

The s280 actuslly has very similar sized turbine and compressor wheels to a gtx2860r. The exhaust housing is a similar size to the tial 52 exhaust housing that can be fitted hence the quick spool. It's main disadvantage is the compressor cover/housing in comparison to a 2860.

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[Hijinx]

And for that fact, no turbo on this car will make 300 on factory fuel.

This is demonstrably false as I’ve got a whole thread dedicated to making 300whp on stock fuel that’s several years old.

What 300whp on the stock fuel system looks like and more inside!
https://r.tapatalk.com/shareLink/to...e-inside!.15674/&share_type=t&link_source=app

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[antarctica24]

This is demonstrably false as I’ve got a whole thread dedicated to making 300whp on stock fuel that’s several years old.

What 300whp on the stock fuel system looks like and more inside!
https://r.tapatalk.com/shareLink/topic?share_fid=74193&share_tid=15674&url=https://www.fiestastforum.com/index.php?threads/What-300whp-on-the-stock-fuel-system-looks-like-and-more-inside!.15674/&share_type=t&link_source=app

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So not trying to argue here, but we done some test of our own and show consistently that Vdyno is off by as much as 30hp as compared to a real dyno. So based on your vdyno logs, that puts you clearly under 300. We did out test recording vdyno as the same time we were on the dyno. And No one has even come close.

 

[MagnetiseST]

You're also talking about a wildly different turbo than a hybrid or something smaller (and more useable) than a 2867.... I'm on watermeth / 93 and an S280 hitting 280whp on a v-dyno. The only reason I'm using a v-dyno is to compare to my previous ones (~260whp on 93 alone). 50/50 provided the 20whp.