This 175 MPH Big Turbo MX-5 Miata Makes 22 PSI On STOCK PISTONS

Matt brings his freshly painted BorgWarner EFR 6258 powered Nardo Grey MX-5 Miata to the shop for a build breakdown. His car features a full BOFI Racing turbo setup including the low mount manifold, downpipe and prototype 3-inch exhaust. An M-Factory 3.3 final drive gives a top speed of over 175 MPH, making it a threat to almost anything on the road.
TIMESTAMPS
00:00 Intro
01:05 The story so far
02:41 Exterior mods
05:25 Interior mods
06:56 Engine mods
09:01 Fuel pump & injectors
12:20 Seam welding
13:03 How to do 175 MPH
16:26 Driving the car
PRODUCTS IN THIS VIDEO
Low mount manifold & downpipe kit bofiracing.co.uk/bofi-racing-...
BorgWarner EFR 6258 turbo bofiracing.co.uk/borgwarner-e...
AEM fuel pump bofiracing.co.uk/aem-50-1200-...
640cc injectors bofiracing.co.uk/bosch-ev14-6...
M Factory 3.3 gear set bofiracing.co.uk/mfactory-dif...
MeisterR CRD coilovers bofiracing.co.uk/meisterr-zet...
MS Labs MS3 Mini ECU bofiracing.co.uk/ms-labs-ms3-...
Jass Low Profile headlights bofiracing.co.uk/jass-perform...
230mm intercooler kit bofiracing.co.uk/bofi-racing-...
Turbosmart actuator bofiracing.co.uk/turbosmart-e...
Turbosmart 4 port EBC bofiracing.co.uk/turbosmart-4...
Fluidampr bofiracing.co.uk/fluidampr-ha...
Boundary Engineering oil pump bofiracing.co.uk/boundary-ass...
Motamec MRX bofiracing.co.uk/motamec-mrx-...
Motamec harnesses bofiracing.co.uk/motamec-6-po...
GC Fabrications roll bar bofiracing.co.uk/gc-fabricati...
GC Fabrications door bars bofiracing.co.uk/gc-fabricati...
GV lip bofiracing.co.uk/gv-style-fro...
Works Bell quick release bofiracing.co.uk/works-bell-r...
PRODUCTS CATEGORIES
Turbo Manifolds & Downpipes: bofiracing.co.uk/forced-induc...
Wastegate Actuators: bofiracing.co.uk/forced-induc...
Body & Styling Parts: bofiracing.co.uk/body-styling/
LINKS
bofiracing.co.uk/?ref=8410
/ bofiracing
/ bofiacing

[@---jh4nf]

that cup holder flap made me burst out laughing 🤣

[@sketti2543]

Miatas cup holder game weak asf😕 one of the first interior mods to do..new/custom glove box/cup holders

[@muhammetozdemir5375]

Aerodynamics my dude. But my cupholders of my mkII aint better😂

[@MrOvershoot]

Mine does that too & with only 146bhp, hurts when you slam your arm down on it

[@culleybayless9835]

HAHAHAHA I saw this comment before and I was like wtf is he taking about. No I’m laughing too 😂😂

[@stupidasshol3]

The "SERIOUSLY EXTREME" custom rear arches got me... lol

[@spazda_mx5]

I think my MX-5 could probably top 175 but I'd be worried about it trying to turn into an aeroplane.

[@thatblackz1850]

If its an NA with stock gearing you run out of geaar at around 130-140

[@spazda_mx5]

The box is a T56 so 6th is intergalaticly long, true top speed would probably be had in 5th.

[@thatblackz1850]

@@spazda_mx5 got ya

[@Gxkrv]

@@spazda_mx5 still got the t56? How’s it holding up?

[@spazda_mx5]

@@Gxkrv No problems, its strong just a bit agricultural.

[@andrewtempleton2407]

It’s great to see more and more 5’s getting built to their 350+ potential! I think it’s companies like BOFI that can make this achievable on a more reasonable budget than ever before. When we forged our 5 nearly 15 years ago now, if BOFI was around it would of saved a hell of lot of hassle and import tax! And although our mx is not quite the 5 it was, it was still good enough to make 365bhp on the last dyno run we did. Keep building these beasts everyone! 👍

[@Buzz-Entertainment]

18:13 speed cameras BOFI: Accelerate hard

[@BoostedNDMiata]

Beautiful. I love the somewhat subtle look on the outside and all the real beauty in the performance. I’ve left my ND exterior with a stock look aside from the rims and lower stance due to cool overs. Can’t wait to get my car back an post a full review of my 300whp ND!

[@onethirdmayo8556]

I’m not impressed by the 175 mph, but a miata being able to make a stop in one piece after reaching that speed.

[@FUzZhockeyboys]

Have you ever hit 90+ in a Miata?

[@SHLOCK8241]

Trace Armstrong it takes a little while to hit 90😂 I don’t think he ever drove a Miata

[@FUzZhockeyboys]

Rocky Imbeault the fastest I’ve gone in my boosted Miata is 90 and I don’t plan on doing it again until my shits more study, it felt like the thing was about to fall apart.

[@skylerblake6969]

I have a pretty much stock nb1 and ive hit just over 100 and it felt stable although i did 120 in a chevy aveo once so anything else feels more stable

[@crawford323]

It’s always something.

[@jaketaylor9174]

Love the content,solid build, More please 👍

[@BOFIRacingTV]

Thanks Jake!

[@ryansoysal6422]

Need more content with this beast

[@SomeOne-lc2pc]

17:28 that back cup holder from the nb is a killer 🤣 pops open on me every drive I take too

[@MrOvershoot]

Mine does that too & with only 146bhp, hurts when you slam your arm down on it

[@danielevans8000]

I've got a nardo grey 1.6 mk2! fantastic colour for these little cars

[@jackhills7474]

17:27 flap mode engaged

[@funboy666ganja]

active air brake

[@jonathanchung7209]

Such a cute car.

[@user-xy5eq9rr3n]

3.3 ring&pinion really changed the car even with my 250whp stock motor miata👍🏻

[@BOFIRacingTV]

We love it, modernises it a fair bit

[@300zxdriver]

How much boost are you running?

[@user-xy5eq9rr3n]

300zxdriver Full boost on 13.5psi. Going above that number can be risky imo

[@Ai.LojTari]

what a beuty

[@tropicalparsoon]

What's the lifespan on 4th gear going to be with that final drive and 300bhp??.........🤔😲

[@alfiebrotherton935]

Long

[@sidewayssam]

Skuzzle has just announced he is shutting up shop, which is a crying shame, i am mates with him and carl at cbs autos in nelson is a very good mate, carls track attack mx5 is a beast, we raced ( i have a 996 911) and we got to 155 lol .he has very solid wings on his, was rock solid.

[@vkotis]

Yeah was gutted when I heard he's shutting down his shop. It was my go to place for mapping. And Nick is a cool guy.

[@gbmgaming]

Me: You can't scare a cupholder flap with boost. BOFI: 17:27

[@wholelottamiata6976]

My buddies turbo NA was making 308whp and we were inching on a 2019 SS camaro from a 40 roll.

[@JimmyHasNoGarage]

talks about the engine, never once show a close up of the bay :(

[@ryanhummel5324]

What about the first part of the video?

[@sketti2543]

Man you guys have little to no subscribers? Your time will come. Keep grinding I could watch this shit all day. Btw how much was spent on this build? This is something i am looking to do in the near future!

[@BOFIRacingTV]

Spread the word, some mad stuff to come.

[@kevoss74]

Good content, I’ve just bought a NB, beginning to think I should’ve bought NA

[@landon390]

🔥🔥🔥🔥

[@DonRoasteh]

Anyone else weirded out by how he kept looking at the camera and not the dude while asking questions? Haha

[@BOFIRacingTV]

You love it

[@TechTokOffical]

Dude running the camera looks like a turtle

[@DaBest21101]

Ricer miata and sammit gotta watch this video.

[@zachbochek]

Skid nation includes the best treats with the reroute kit

[@vampricgoldfish]

Any news on when the prototype 3.0inch exhausts go up for sale? and pricing? would love to buy a full turbo set from manifold to exhaust tip

[@hksjoshua]

So max realistic speed of like 140mph cool beans

[@caza00caza]

I'm here for a good time not a long time

[@BOFIRacingTV]

🙏

[@bradtyson]

Wouldn't every gear ratio be changed with a different rear ring & pinion?

[@kyracing8902]

😂 good video

[@AMDcore1]

What was the song used for the glamor shots please?

[@thefailxtreme]

I am not native english speaking and did not quite understand one part. What do you mean with seamwelded front to back?

[@mudkip863]

Question, either i missed it or it was not mentioned in the video. Since this is stupid fast what suspension & brake mods have been done? I think i saw coilovers during the engine bay shot but not 100% sure. Amazing build definetly gave me some ideas for my NA.

[@BOFIRacingTV]

SVT Brakes with Roddisons Pads, Miester R CRD+, Whiteline Anti Roll Bars, Braided Brake / Clutch Line

[@supercrewe]

Come to Minneapolis to see my 360 atw built MX%

[@X7rocks]

What was that trick he was talking about with the wideband??

[@crawford323]

What about a Zero Zero ejection seat? It would be handy.

[@droboyjr]

I think you should have focused more on the engine when he was talking about it more than pointing the camera at the owner. Just my .02

[@romoalex]

OONOS

[@raviolitrail]

Looks like it hits 75mph pretty quick.

[@kevinsaeed9817]

Which ducktail is this on the car?

[@Redbaron_Gaming]

Looks decent other than the headlight conversion.

[@inigolol1]

Carbon miata rear trunk?

[@christopherwilliams9328]

Where did you get the hood vents

[@BOFIRacingTV]

They're GC Fabrications vents

[@SHLOCK8241]

Real men keep the top down while doing 175 and not with a hardtop

[@ohnoitisnt]

While i agree, youd probably need another 100hp to get there!

[@mikedzialoszynski6692]

5:56 "the can check gauge"........ i would like to know more about what that is

[@BOFIRacingTV]

We'll do a full video on them, they're absolutely fantastic retrofit digidashes that fit in the oil pressure gauge hole in the cluster

[@Kyle-nz9wl]

I don’t think this was mentioned din the video but how much power does this beast make?

[@ionicbreeze]

I think he said around 300whp

[@poseidonasas]

Is the ring and pinion noisy during accelaration and decelleration??

[@BOFIRacingTV]

no it's dead quiet

[@MatthewGerrard-yf6cq]

Anyone know what size those wheels are?

[@Rex7767]

When's the 3" exhaust going to be available to buy and will it be a full v-band system?

[@BOFIRacingTV]

About 3-4 weeks, we've used V Band systems before and they're actually a pain to work on and they sit lower than they need to (VBand lip +Clamp) so this system is slipfit with clamps that keeps it as high as possible, easier to use too.

[@Rex7767]

@@BOFIRacingTV ok well I have your low mount system and as you know downpipe is V-band. So will it fit ok with your manifold, downpipe setup?

[@theodxs]

What is the exhaust?

[@justinjohnson623]

Wish I could see it hit 175mph

[@BauregardSenior87]

I've just started my MX5 journey with a junker NB with rust, dents, scratches and 120k miles on the clock, my budget is next to nothing and everything is taking me a lot of time. I've had it for almost a year and only just got the basic servicing and MOT stuff done.

[@Gxkrv]

Your ahead of most mx5 owners if it’s passed it’s mot😂😂

[@dracolich345]

How is it now?

[@apetska4817]

That miata's front end showsvisible confusion

[@eatmyshortsgirl]

uhm.. no complaints at all

[@GathersNoMoss]

It looks like a good setup, but there's just one thing about this build that puzzles me: If new rods have been fitted, why not fit forged pistons too? Looking on BOFI's website, they don't look prohibitively expensive, compared to the cost the other parts fitted to the car.

[@seshboisam1141]

The weak point for the Miata has always been the rods they don’t like to see more then a few psi but stock pistons have been known to hold up to 30 psi before they see detonation. If your boosting on a budget it’s common to just upgrade rods and save the extra cash for a better quality turbo kit. Upgrading the pistons is for someone looking to have that extra piece of mind it’s only a couple hundred dollars more but if your going big boost then upgrading the injectors, pistons, rods, oil pump and fuel pump is the way to go.

[@BOFIRacingTV]

The block was used with a GT2560R first, so pistons were less of a requirement back then

[@GathersNoMoss]

@@seshboisam1141 I didn't know that the stock pistons were that strong. Thanks for the info!

[@VeryMuchSaab]

That saab 9-3 sport combi though....

[@BOFIRacingTV]

phwoar

[@kingofwestpalm6350]

Do you sell to the US?

[@BOFIRacingTV]

We sure do, worldwide :)

[@Abevlogsofficial]

Where did he get the overfenders from?

[@BOFIRacingTV]

ebay 😅

[@Nasonix2]

I just realized... How in the world is he running 20+psi with stock fuel pressure and some 640's?.... That thing would be out of fuel at 290whp on gasoline. More like 15-17psi at most?

[@PhantomShane914]

640s will flow probably around 400hp at 43.5psi lol. I pushed 420cc rx8 yellows to their limit around 290whp.

[@kaykaliszewski555]

I have watched a little bit of your video and i can say for myself, that your selfie kind of perspective is annoying. My advice: Do not film yourself, film the owner and the car. Make more close ups on the enginebay and stuff like that.

[@MagmaBmx]

Also maybe incorporate a go pro head mount to give the viewers a feel for the drivers seat

[@inigofilm]

rotas 15x8 et0 or 15x9 et 20?

[@BOFIRacingTV]

15x8 ET0

[@savvas5548]

what about engine management?

[@BOFIRacingTV]

MS Labs MS3 Mini

[@4lairr]

i've got a 4.3 rear end in my miata and wound it right out only one time. 145 150 ish. That's plenty fast in a miata for me...

[@shinobi1203]

5spd or 6?

[@4lairr]

@@shinobi1203 i've got the 5 speed in my car. Turbo charged with xida coil overs big front sway bar. Super twitchy alignment. autocross/streetcar

[@shinobi1203]

@@4lairr damn, u reving your engine to the stratosphere?

[@4lairr]

@@shinobi1203 I think I've got it set to 7200 on a 225/45/15 tire the speedo stops at 225km but gps speed said i got a little more out of it. Not what my car is set up for at all but i cant imagine getting another 30+mph out of it

[@LxrdGmail]

Hoon Jung the 6th fear in the 6 speed is shorter than the 5th gear in the 5 speed tho

[@Throttle.Monkey]

Any plans for some mk3 content?

[@BOFIRacingTV]

Definitely, got a mk3 coming end of July

[@owenledge]

Ahoy mateys!

[@ela_giwrgi]

this is a car channel not a boat channel

[@jeffreydevries2459]

no its called bofi racing not boatfi racing

[@naseeb46]

My dream is to build a 200 MPH miata!

[@BOFIRacingTV]

Do it! Check gear calculators on K miata

[@archiepotts164]

Bro has that 1.6 oonos

[@screwdajuice]

I want to put two 50 digit locks around those earrings

[@4RMS7TRONG]

I bet it would do 180 if the headlights weren't fixed up in position ;)

[@BOFIRacingTV]

😂

[@TheCSHeckler]

It's got the most development of the fleet? He opens the bonnet then hardly bothers to film it?

[@BOFIRacingTV]

More video to come on this, bigger pistons, beefier rods

[@Gn0m4]

Who is the owner? I would like to see a dynoplot to check torque curve.

[@BOFIRacingTV]

We're getting a dyno in 3-4 weeks so we'll be posting figures shortly after

[@Gn0m4]

@@BOFIRacingTV no news?

[@jaccboyjohnny2805]

fenders < arches 😂😂

[@TheMaroth]

175 mph sounds a bit much for a OEM Gearbox and a 3.3 Mfactory. Running a E92 BMW Gearbox and a 3.3 M factory on my EFR 8374 500 HP MK2.5, which has a longer 6th gear as any of the OEM Miata gearboxed and GPS im hitting 170 mph. unless it runs till 8k rpm ofc...

[@PhantomShane914]

A 3.636 torsen mated to a factory 5 speed will top 171 revving to 7400rpm. 165 with a 6 speed. I'm sure a 3.3 will easily go 175

[@shaunsheep8252]

Please keep the camera still

[@percylfc7165]

Could have been a great video, if the youth new how to use a camera 😜😜😜

[@joshuwacampbell836]

........ so where'd the 175 MPH go?

[@saapergis7609]

22psi= 1.56bar, on stock pistons

[@High_Desert_Tanner]

I can't imagine having to shift left handed... Seems so awkward to me

[@manavpatel4484]

I can't imagine changing gear right handed, now that is weird 😂😂

[@High_Desert_Tanner]

@@manavpatel4484 nah... You got that backwards 🤣🤣🤣

[@megavidio97]

I have driven both and you get used to it surprisingly quick actually

[@supernite1183]

Sick content u should make a tik tok !!

[@MrOvershoot]

How tall is Matt? I'm 6'3" or 191 cm and have had to do the Foamectomy on the seats to fit in so I like the look of that seat if Matt is a real size ;)

[@matthewloveday3988]

im 5'11 buddy, i did the foamectomy before i ran bucket seats, you do gain alot of room buy putting the seat alot further down and back :)

[@poseidonasas]

@@matthewloveday3988 did you have any issues with the m factory 3.3 ring and pinion with noise after installation? Also what did you do with your speedo drive?

[@matthewloveday3988]

@@poseidonasas no a small noise at 40ish but nothing bad, I went to a race dash with GPS speedo because I could never get the speed correct on the standard clocks

[@gavindoran4394]

Maybe it’s running 22 psi on stock pistons because it came stock with forged internals😱

[@magnetic0314]

What?

[@lil_woody_420]

Well, the pistons can handel 330-350 hp. Main thing destroying them is temperature. But the rods are the biggest weakpoint when trying to go for big power on the miata

[@Revmatchdownshift_]

175? That's a Ripley's

[@HenzPowell]

I could really do with 300hp.... My 190hp is getting a bit old now. If you fancy having mine on for a collab check out my channel!

[@stupidslave]

Bad idea

[@jollyjoey1353]

lol, stock pistons.. but, "forged engine"

[@jergagne9]

we dont want to see your face, we want to see the damn car

[@BOFIRacingTV]

neverrr

[@bradbrad6750]

bro can you show the fucking car???

[@fobosmental8276]

More drift less talking

[@Speedwelltuning]

‘Over fenders’ that’s an American term and daft. They’re called wheel arches.

[@JD-eo7dr]

They call them that in Japan too

[@crawford323]

Paint didn’t make it go fast. Get on with it boys.

[@daltonmeredith6790]

Awesome video but really stupid ear rings my guy

[@blackjack9863]

Kph and not mph What a fake 😅

[@glasserallen]

17 minutes of talking, 3 minutes of driving =FAIL!

[@mosesley9425]

Your voice is crazy weird

[@Esi_Coupe]

“Extreme arch work” 😭💀 pulling your fenders to fuck all is not “extreme”. -0 offset is not “extreme” lmfao. I’m on 40mm overs and -38😂