Need some advice on "Godspeed" turbochargers and GT2554R equivalents. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-24-2013, 04:10 PM   #21
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Quote:
Originally Posted by Braineack View Post
The .86 turbine of the SR20 T25, while a smaller turbo, kills the spool. It already doesn't spool that fast on a 1.8L. If you could find a T25 like an SR20 one that doesn't have such a large turbine A/R, it would be a better match for a low boost setup however.
It's true. The main things that turbo has going for it is that it's reliable, cheap, and common.

Full boost arrives on my bp4w w/ t25 around 3600rpm, although I'm way up in altitude so I have no idea how that compares. Certainly spools faster than my old 1.6 greddy by quite a big margin.
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Old 12-24-2013, 04:14 PM   #22
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pretty sure the sr t25 is not .86 scott

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the older turbos are all journal bearings, garett sells the newer ones for s13's that are ball bearings (gt2560r) the ball bearing is shown by the R in the name. garrett doesnt sell the old journal bearing turbos.
http://www.turbobygarrett.com/turbob...R_466541_1.htm

Redtop - Garrett gt2560
Journal bearings.
Compressor: T-25, 60 trim 56mm BCI-1 compressor.

Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.


Blacktop - Garrett gt2560

Compressor: T-25, 60 trim 56mm BCI-1 compressor.

Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.

Center Section: Journal bearings

The turbos are exactly the same except one is newer.


s14 sr20det
gt28/25 hybrid turbo
gt25 compressor side and gt28 turbine side.

Compressor: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing

Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.
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Old 12-24-2013, 04:16 PM   #23
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See post 20
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Old 12-24-2013, 05:30 PM   #24
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Quote:
Originally Posted by Braineack View Post
It actually performs quite well on teh 1.6L it's not oversized at all.

The compressor output is similar to that of a 2554, but the T3 turbine provides more flow up top, so you can still make plenty of top-end with it (crapping out around 250).

I've driven too many 1.8L setups so I got spoiled, but that T3 was running very well on my 1.6L, better than more other turbo setups in regards to the spool/tq. I was making ~240rwtq at ~4100RPM.

The .86 turbine of the SR20 T25, while a smaller turbo, kills the spool. It already doesn't spool that fast on a 1.8L. If you could find a T25 like an SR20 one that doesn't have such a large turbine A/R, it would be a better match for a low boost setup however.
Thank you, well i'm gonna give it a shot. In you can Braineck, google or ebay for me and send me a link to a T3 turbo that you believe would work well for my application. Internal wastegate and v-band is what I prefer. There are so many internal T3's with this a/r and that trim that it kinda overwhelms me, lol.

If it comes to me and it grenades in a few day, I won't hold it against you...
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Old 12-24-2013, 06:31 PM   #25
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Quote:
Originally Posted by thirdgen View Post
.86 turbine? I've never seen a sr20 turbo with bigger than .64. The only sr20 size difference I've seen was compressor size.
maybe im thinking of the compressor a/r...whatever the case, i was never too impressed with them on 1.6L dynos. 1.8Ls, sure.

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Scott, that 240whp @ 4100rpm was on a 1.6 with a t3 super 60, am I correct?
lol. no. the super 60's compressor is too large to make torque like that. you'll never see equal tq/hp with a large turbo. that was with the ebay chincachrager 45 trim; much better imho.

the revvy cam profile that everyone loves on the 1.6L really prevents then from performing well under 3.5K.
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Need some advice on "Godspeed" turbochargers and GT2554R equivalents.-nov_13_2010_china_vs_nov_10_2008_garrett.jpg  
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Old 12-24-2013, 09:04 PM   #26
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T3 45 trim... Definitely a different torque curve compared to a 1.8.
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Old 12-24-2013, 11:45 PM   #27
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Thanks for all the advice guys, I found a T3 .48AR Turbocharger for 219 bucks, internally wastegated, 8 psi actuator, v-band. Lets give it a shot
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Old 12-25-2013, 10:42 AM   #28
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Just copy what underdog/brain did
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Old 12-25-2013, 03:03 PM   #29
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Quote:
Originally Posted by 18psi View Post
Actually the MSM ihi is a slow spooling turbo for how small it is. A 2554 will be much quicker.

I think your 2nd idea of getting a quality setup is a much better one. Add proper EMS and injectors and just enjoy a quality setup
I second this. The IHI is a little **** of a turbo. Makes till 4000-4500 for 16psi. I can post spool data is need be.

It makes you feel like you have a big turbo spooling up but you get the tip, only the tip.
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Old 12-27-2013, 09:30 AM   #30
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Originally Posted by viperormiata View Post
Just copy what underdog/brain did
yep, he saw similar results with it:



I think he was only on a 2.5" exhaust however.


now compare the TQ/Spool of a 1.6L with the SR20 T25 with a 3" exhaust:



add like 10-12% to this to match a dynojet.



And it's not even that it spools any faster, it's the power it provides when it's spooling is much greater than the SR20 T25 (you can see this on my dyno comparing a S60 to the 45 trim). I've never seen an entirely impressive 1.6L SR20 T25 dyno plot, but like I said, they perform GREAT on a 1.8L.
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Need some advice on "Godspeed" turbochargers and GT2554R equivalents.-turbo_miata_dyno_4_2011.jpg  
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Old 12-27-2013, 09:35 AM   #31
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Quote:
Originally Posted by Impuls View Post
I second this. The IHI is a little **** of a turbo. Makes till 4000-4500 for 16psi. I can post spool data is need be.

It makes you feel like you have a big turbo spooling up but you get the tip, only the tip.

yeah if you wanna do the small turbo thing, try the smaller WRX turbos. T40d-13t or wahtever it is.
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Old 12-27-2013, 10:08 AM   #32
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I am also running the same T3 turbo as Braineack on a 1.6 based on the recommendations by him and other forum members and I am very happy with it.
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Old 12-27-2013, 10:14 AM   #33
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Here is why the SR20 t25 is great on the 1.8L but shitty as hell on a 1.6L:

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Old 12-31-2013, 11:41 AM   #34
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Originally Posted by viperormiata View Post
Just copy what underdog/brain did
Can you link the exact turbo on ebay they went with?

Is this the same? T3 T4 Turbo Charger Trim 50 A R 63 AR T04E Turbocharger | eBay
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Old 12-31-2013, 11:57 AM   #35
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I could. But, I don't really feel like it.

Search.
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Old 12-31-2013, 12:00 PM   #36
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Quote:
Originally Posted by Fatvod View Post
Can you link the exact turbo on ebay they went with?

Is this the same? T3 T4 Turbo Charger Trim 50 A R 63 AR T04E Turbocharger | eBay
not even close.
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Old 12-31-2013, 12:14 PM   #37
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Ive been all through your threads brain and underdogs build threads, ive been searching. They are all from 2010-2011 and the ebay links have expired. Sorry im trying my best >.<

Edit: Think I nailed it in an old thread. The guy posted the exact specs.
http://www.ebay.com/itm/GSP-T3-Turbo...3a7d7a&vxp=mtr

Seem right?

Last edited by Fatvod; 12-31-2013 at 12:35 PM.
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Old 12-31-2013, 12:36 PM   #38
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that appears to be the one.
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Old 12-31-2013, 03:12 PM   #39
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Did these turbos need to be prepared or clocked at all?
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Old 12-31-2013, 03:15 PM   #40
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all universal turbos have to be clocked
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