Mountune Fiesta MRX Turbo

[TyphoonFiST]

"Turbine is for the exhaust side and is not custom made""Turbine is something that is acted upon by fluid" It is a standard GT2554R turbine wheel. I believe you are speaking in regards to the "Compressor wheel" in which yes it is custom. But unless they or their team have some serious CFD skills, I doubt they truly upgraded performance. (sorry just want people to know the correct nomeclature of turbo components),

I asked mountune directly for compressor maps, Inducer Measurment, Exducer measurments, Blade tip height and or the "E measurement" and the compressor wheel contour. The promptly ignored my request for that information. If they had used a CFD program to design the wheel, then they would have been able to provide compressor maps and data such as surge line, pressure ratio and Lbs Per Minute.

Just because it is "Billet" does not make it better. I sell around 15,000 turbos a year and have been certified by every turbo major vendor there is other than IHI and Mistubishi (bastards). Many people want "Billet wheels" but I generally steer them away for these reasons.

Billet is a very loose term and actually can hurt performance. Often times they are heavier than a cast compressor wheel which i am betting this one is infact heavier. It depends on the quality of the Billet as well. Generally with a Forged Milled aluminum wheel you can get a more aggressive blade profile, thinner outer bore and will be much stronger. Now if it was a FMW (Forged Milled Wheel) that was stronger, could hold up to over speed better and genuinely had a better Aero profile than the some 15 year old GT2554R then yes it could flow more. Generally when a company uses billet wheels, it is because it is cheaper to manufacturer a custom compressor wheel, then having molds made and having them cast from a foundry as well as much, much quicker. If they kept the same measurement listed below of the stock 2554R compressor wheel, more than likely it would just be better at surge reduction and noise more than anything. I also asked what kind of Balancing process they use for the rotating assembly, since every time you replace a major component of the CHRA, it is wise to do a re-balance especially the speeds that these turbos see. They also ignored supplying that information.

The stock GT2554R Compressor Wheel Specs=

Part #445347-0016 Model=T025 Trim=60 Exducer=54.00MM Inducer=42.11MM "E"=9.96MM Length=24.48MM Blades=6 & 6 Contour=497974-0001 Bore Type=THRU-BORE Bore Diameter= 5.994MM Material=ALUMINUM


Turbine Wheel Specs=


Part #435813-0001 Model=BBT25 Stub Shaft Type=THRU-BORE Inducer=53.00 (MM)Exd=41.73(MM) Trim=62 Clip= 12.50 Blade Count=11 Casting Material=GMR 235


Since they are not using the factory actuator (the stock GT2554R has a straight rod that is non adjustable) I am un-able to provide any specs on it, but if I was to take a bet, something from Turbo Smart would fit. Something like this, depending on the MRX's rod length http://www.turbosmartdirect.com/Pro...s/IWG75-Universal-150mm-rod-14-PSI-Black.html

Does anyone have the compressor cover off and is willing to get some quick measurements for me off the compressor wheel? Also measuring the Rod Length of the actuator?

The actuator rod is not straight on some of the GT2554Rs as I can attest to this as I have one sitting in a box in my basement. As with the billet wheel....i agree....everyone just jumps on the billet train. Thinking it will be all that and a bag of chips when it can actually not have any gains at all. But hey what do we know....right?

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[Steve Drill]

Every Tom, Dick and Harry now has a 3-axis CNC mill... And a dream.

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[Brura22]

Everyone's criticizing the billet fan boys when yet the entire DHM fan base was based off the "GTX" features..[emoji23]

Annnnnd, arguments GO


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[STAZ15]

Everyone's criticizing the billet fan boys when yet the entire DHM fan base was based off the "GTX" features..[emoji23]

Annnnnd, arguments GO


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DHM comes in for the argument ... ohhh wait... [emoji19]


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[Brura22]

DHM comes in for the argument ... ohhh wait... [emoji19]


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Too soon?[emoji23]


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[STAZ15]

Too soon?[emoji23]


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That's what I was going for!


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[Turboman17]

The actuator rod is not straight on some of the GT2554Rs as I can attest to this as I have one sitting in a box in my basement. As with the billet wheel....i agree....everyone just jumps on the billet train. Thinking it will be all that and a bag of chips when it can actually not have any gains at all. But hey what do we know....right?

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Do you have a part number off that turbo? Would love to look it up on the Garrett data base so I can make some notes on it. Even the Mazdaspeed protege's gt2554r had a straight rod.

A good friend who is an engineer with Borgwarner was asked to do some testing a wheel that really started the Billet wheel craze. That wheel being the Batmowheel versus a stock Borgwarner S480 compressor wheel. The Batmo Billet wheel flowed 8lbs a minute less than the stock compressor wheel. Only place it did slightly better was it opened up the surge line in certain pressure ratios. Here is a diesel forum that got wind of it and the discussion that endsued.

http://www.competitiondiesel.com/forums/showthread.php?t=142796

 

[Turboman17]

Everyone's criticizing the billet fan boys when yet the entire DHM fan base was based off the "GTX" features..[emoji23]

Annnnnd, arguments GO


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I think the big difference is that Garrett is technically Honeywell Turbo Technologies, that happens have a huge Aerospace program where they get a lot of their wheel aero technology from. They also have huge foundry supplies of the best quality Billet metals, since all Billet is not created equal.

I am not a billet fan boy at all but I do remember the first time I saw my first turbo with one in it. It was a Mack truck application and I thought to myself! Wow! That's pretty bitchin.

Now a days I get excited to see Titanium compressor wheels. Normally when I see them, it will have bored itself halfway out of the compressor cover after the turbo has failed. It's pretty gnarly.

The only reason manufacturers are using billet compressor wheels on performance turbochargers is because of the billet craze and the fact it is so much cheaper to produce on such small quantities.

 

[Brura22]

I think the big difference is that Garrett is technically Honeywell Turbo Technologies, that happens have a huge Aerospace program where they get a lot of their wheel aero technology from. They also have huge foundry supplies of the best quality Billet metals, since all Billet is not created equal.

I am not a billet fan boy at all but I do remember the first time I saw my first turbo with one in it. It was a Mack truck application and I thought to myself! Wow! That's pretty bitchin.

Now a days I get excited to see Titanium compressor wheels. Normally when I see them, it will have bored itself halfway out of the compressor cover after the turbo has failed. It's pretty gnarly.

The only reason manufacturers are using billet compressor wheels on performance turbochargers is because of the billet craze and the fact it is so much cheaper to produce on such small quantities.

Okay..[emoji23]

 

[antarctica24]

By all means I do not know everything about turbochargers, though I am working on becoming "that guy who does". I do not mean to come across that way, unfortunately I just come across as such. I had to get help from a gentlemen who has been doing dealing with turbos for 53 years just on Tuesday who thoroughly made me feel inept on turbo info. But I do love learning and being proven wrong.

And absolutely not, just because Mountune does not post compressor maps doesn't make it junk. They started with good bones which is a Garrett CHRA. But why tout the compressor wheel and not give specifics other than 11 blade and billet.

I will try to dig up some pictures that I have of the compressor wheel and material being used weight comparission I did for my and one of my co-workers own little self enjoyment. Billet aluminum generally is a denser per square inch material than cast aluminum because of the pourous nature of the casting process. Which is why Billet "generally" is stronger If manufacturers were flow forming compressor wheels then it would be a different story. So when you add a denser material, you will add mass, unless you can remove more mass then what was added. It can be done if you really shave away material away from the compressor wheel hub and the back face of the hub as well as making thinner blades.

I must also add that most billet compressor wheel manufacturers such as KTS and Wicked Wheels make the wheel taller (sticks further out the compressor outlet than normal) which again adds mass and does not add performance normally.

I should say I am a concerned hopeful that the MRX from mountune brings higher numbers than it has. I think a wastegate change will truly be that deciding factor. Sometimes my turbo knowledge is my hindrance and makes me doubt that smaller companies can produce something better in quality, performance and reliability than an OE like Honeywell turbo technologies or Borgwarner.

I certainly agree on the lack of specs. If all the things you asked for help a customer determine what is the best turbo for them, I'm thinking they should be sharing that information. When I order my tune I will take your list and ask for it. You make a good argument for the billet weighing more. If you access to the parts weigh them out and let's see what it says. I would be really curious.

Mountune claimed 275/275. Weve made 300/300. I think with some meth e30 or equilivant 335 is certainly doable based on what randy is speculating. Only time will tell.

What would an upgraded wastegate give me?

 

[STAZ15]

So what makes this out do the 2554r is the billet wheel a little larger? Are the housings any larger than atp?


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[STAZ15]

I certainly agree on the lack of specs. If all the things you asked for help a customer determine what is the best turbo for them, I'm thinking they should be sharing that information. When I order my tune I will take your list and ask for it. You make a good argument for the billet weighing more. If you access to the parts weigh them out and let's see what it says. I would be really curious.

Mountune claimed 275/275. Weve made 300/300. I think with some meth e30 or equilivant 335 is certainly doable based on what randy is speculating. Only time will tell.

What would an upgraded wastegate give me?

In theory a stronger wastegate say 21 to 22 psi like @rerx7 was speaking of should help it hold boost closer to peak on the top end.


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[TyphoonFiST]

Here is a pic of the actustor....

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[Brura22]

Here is a pic of the actustor....

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I think we're in business boys.
Just take the extended rod off the end of the MRX WG and let er rip



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[re-rx7]

I think we're in business boys.
Just take the extended rod off the end of the MRX WG and let er rip



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Exactly what I was saying! LOL This is the part Ive been talking about.

 

[shouldbeasy]

Exactly what I was saying! LOL

So... why hasn't anyone upgraded to a turbosmart WGA?

It's pretty much a standard mod when it comes to the x-47 and I wonder why it hasn't transitioned into this turbo update.

 

[re-rx7]

So... why hasn't anyone upgraded to a turbosmart WGA?

It's pretty much a standard mod when it comes to the x-47 and I wonder why it hasn't transitioned into this turbo update.

Cause they dont make on that will fit?

 

[re-rx7]

Here is a pic of the actustor....

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IS this the MRX turbo? If so I dont recall mine being welded

 

[Turboman17]

IS this the MRX turbo? If so I dont recall mine being welded

I don't believe so. I think that is a picture of Typhoons GT2554 that I requested a picture of. But I still think the mrx and the one he showed a picture of use a GT28 sized actuator.

 

[shouldbeasy]

Cause they dont make on that will fit?

Sounds logical!

What's the limiting factor? It won't bolt up? The rod too long / short?