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[TTC]

A buddy of mine is building his 1600cc miata, an to was initially going to use a 2860RS. I convinced him this was fine to get near 300whp. but now hes saying he wont think it will make it. He did all the math and I went over it, its fairly close at around 2.8PR and 40CFM iirc.

He wants to run 22lbs on a gt30R, personally I think its to big and hell make no power under like 6k. What im trying to figure out is will it surge on him, and will it be usable power at all?  Any thoughts on power delivery?


thx all

[highroller54]

which gt30?

[NaturalDecimal]

a gt28 with at least an .80 hotside is the ticket for him. God I loved that turbo.

[TTC]

3076R with a .64

[TTC]

a gt28 with at least an .80 hotside is the ticket for him. God I loved that turbo.

Will it crack 320whp?

[Lowerit]

Matty Moore?

[highroller54]

pump gas?

[TTC]

Yeappers

[TTC]

pump gas?

Yea, on pump. Sunoco 94 prolly

[d112crzy]

Whats the redline on that motor? D series spool those turbo's just fine, but they also have a 7-8k redline, depending on mods.

[TTC]

When he builds it over the winter it will rev to 8k. thing is you cant compare these motors to a honda motor, they just dont spool turbos as fast as they do. 

the other issue is that hes going to run 9 10 lbs this year till his motors built.

[bigwig]

When he builds it over the winter it will rev to 8k. thing is you cant compare these motors to a honda motor, they just dont spool turbos as fast as they do. 

the other issue is that hes going to run 9 10 lbs this year till his motors built.

Why do you say that?  Mazda engines are pretty similar to any other 4 cylinder engine with no v-tec like feature.

300whp in most Miatas is for racing in a straight line against other cars.  If that's what he's interested in, tell him to get a 50 trim t3/t04e.  If he bought a Miata because he likes driving a short wheel based, RWD, "sports car" then he should stick with the GT28rs and start saving up for suspension, tires, wheels, roll bar, and chasis stiffening.

[runsfromdacops]

a gt28 with at least an .80 hotside is the ticket for him. God I loved that turbo.

Will it crack 320whp?

makes 300 hp on my bike.

[kamilk69]

a gt28 with at least an .80 hotside is the ticket for him. God I loved that turbo.

Will it crack 320whp?

makes 300 hp on my bike.

mother of god that must be a fun bike to ride.

[Joseph Davis]

GT3071R in a T25 hotside doesn't make boost until 5500 on a D16Z6.  Call it 6K on that Miata, and he's got a narrow 2000 rpm powerband with a violent sudden onset of last minute too late to be useful torque which is the hallmark of the garbage GT30 family.

GT28 of some flavor, boost by 2500 rpms and after 200 whp the car's worthless for anything other than drag racing, with the exception of high speed roadrace tracks that have mile long straights and high speed sweepers.

[TTC]

Hes into .... Drifting ..

/shame

thx for the info

[turbob16hatch]

GT3071R in a T25 hotside doesn't make boost until 5500 on a D16Z6.  Call it 6K on that Miata, and he's got a narrow 2000 rpm powerband with a violent sudden onset of last minute too late to be useful torque which is the hallmark of the garbage GT30 family.

GT28 of some flavor, boost by 2500 rpms and after 200 whp the car's worthless for anything other than drag racing, with the exception of high speed roadrace tracks that have mile long straights and high speed sweepers.

You sure on that 3071 JD? That is pretty high. Theres alot of factors here that could sway your response. Thats bw s25x spool range.

and on the gt30's i would assume the turbine in the gt2871/76 is more then enough for 400hp on the small 1.6L so why go to the gt30 turbine correct? After getting my hands on a gt2871r that thing look more then capable.

[TTC]

That is the issue im having, a 2871 should easily get the power numbers he wants. He also wants to use a tial hotside, with the vband.

[Lowerit]

Hella FLush

[turbob16hatch]

That is the issue im having, a 2871 should easily get the power numbers he wants. He also wants to use a tial hotside, with the vband.

well they make them for the little guys.

[Mike Oxbig]

yea thats what i thought

[Joseph Davis]

GT3071R in a T25 hotside doesn't make boost until 5500 on a D16Z6.  Call it 6K on that Miata, and he's got a narrow 2000 rpm powerband with a violent sudden onset of last minute too late to be useful torque which is the hallmark of the garbage GT30 family.

GT28 of some flavor, boost by 2500 rpms and after 200 whp the car's worthless for anything other than drag racing, with the exception of high speed roadrace tracks that have mile long straights and high speed sweepers.

You sure on that 3071 JD? That is pretty high. Theres alot of factors here that could sway your response.

D16Z6 with GT28RS on kill:





Exact same car/setup with the T25 flanged GT3071R on kill:




Net change in track times: went from consistent 7.5-7.6's to consistent 7.4-7.5's.  One tenth. 

[highroller54]

you cannot have too much turbo, only too little motor

 

[bigdaddyvtec]

Shitty, Nolan just made 476 on a 30R on his vitara D.... t3 however...

The 30R is gay how it lights up ferociously and then chokes almost as fast though. He has boost before 6k though...

[DRFT]

Hey there,

I am the guy looking for the miata turbo.
I was sitting at 225 @12psi before the 2860RS kicked the bucket.   225 isnt quite enough to spin the tires like i want for what i do unless it rains.

to get the car to feel that fast in the dry i will need ~320whp.

The 2871R 0.86 with 54 trim compressor wheel i DID fall onto the pressure ratio and flow charts, but the turbo speeds were ~127-130K so i would be blowing MAD amounts of heat into my engine. (very top edges of the effiency charts.)


For my future turbo im going to get something that suits the car and its purpose. i was NOT planning on getting a t2 hotside for the turbo. t3 GT housing or TiAL housing is the plan at 0.63 hotside.

There are several 3076R miatas out there already that make peak boost (20-22psi range) around 4500rpm.
More on this later.

[Joseph Davis]

Hey there,

I am the guy looking for the miata turbo.
I was sitting at 225 @12psi before the 2860RS kicked the bucket.   225 isnt quite enough to spin the tires like i want for what i do unless it rains.

to get the car to feel that fast in the dry i will need ~320whp.

Then turn up the boost?

The 2871R 0.86 with 54 trim compressor wheel i DID fall onto the pressure ratio and flow charts, but the turbo speeds were ~127-130K so i would be blowing MAD amounts of heat into my engine. (very top edges of the effiency charts.)

Uh, no.  Ban for being stupid?

[ryan89crx]

Then turn up the boost?

[TTC]

Then turn up the boost?

what i said

[patsmx5]

I remember some miata guy that ran a 30R $$$$ turbo on a 1.6 a long time ago. Said it was balls slow 4K, then it made some boost, full boost around 5K. Not the best setup, but it was fun after 5K. FWIW, I run a GT3271 on my 1.8L, full boost around 4500. Nother guy I know ran this exact turbo on a 1.6, full boost at 4800.

[DRFT]

when i was on the dyno my EBC was acting up. 0.3% duty cycle change on the AEM was putting it from WG pressure to unhooked WG pressure (was shooting as high as 16psi before the boost cut hit)

Since the turbo died and im tearing the engine apart this winter i am trying to properly size the turbo to my goals.
the 2871R MIGHT be able to make it... but from seeing setups on miatas the 2871 on my 1.6 will need ~24-26psi manifold pressure and they really arent efficient at that.