I cant find this common turbo!
 

I've looked everywhere for a cheap used t25 turbo(preferrably from an sr20) and believe it or not I cant find one anywhere. Imon a budget build so I dont wanna spend $700 on a new one. someone help me find one. (I dont want to buy a chinese ebay turbo either)

Im feeling generous.
One
Two
Three, 300zx Turbos have a 4 bolt flange. just a warning incase you already have a downpipe.

One: I'd stay away from any ball bearing turbo with shaft play you can't rebuild them.

Two: Skyline T28 turbos are going to be a little bit small. Also see #1.

Three: Z32 stock turbos use a .48 cold side, too small even for a Miata imho.


For the OP: Keep your eyes on the classifieds at www.sr20forum.com, www.sr20-forum.com, www.g20.net, www.zilvia.net, www.freshalloy.net, and NICO posted above and you'll find a nice inexpensive t25 that will fit your needs sooner than you think.

I just sold a fully functioning ready to bolt on T25 for 100 bucks on ebay.

t25's are everywhere kid, just be patient.

Is your Miata even turbocharged or ever driven a turbo Miata with a .42 or .48 cold side?

http://cgi.ebay.com/ebaymotors/_Car-....c0.m245.l1318

http://cgi.ebay.com/ebaymotors/_Car-....c0.m245.l1318

ROFL I know right....what size motor is the T28 off of? what was that? 2.0L?! what....that's 400cc larger than a 1.6L?!?!?!?!?!?

god, i made +230rwhp with a .48 A/R!!!!!!

HOLY SHIT!!! I USE A T28 COMPRESSOR WHEEL!!!!!!

AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH HHHHHHHHHHH

No but I've owned a turbocharged 4cyl car for 8 years thats had either a t25 or a t28 on it the whole time. I also know a good bit about which Nissan turbos are decent. I suppose an RB t28 might be ok for a 1.6 if you're only looking for 200hp or so hp but its generally considered to be a pretty lame turbo in the SR20 community.

PS I have a BEGi kit with a spud on its way for my Miata... ;)

http://www.boostedmiata.com/dyno_day...plots/lars.jpg

God i would hate to have a sr20 T25 on a 1.8L miata....



http://www.boostedmiata.com/dyno_day...am_samnavy.jpg

WHATS THIS?!?!?!?!!? COULD IT BE?!?!?! NOOOOOOOOOOOOOOOOO, IT'S NOT POSSILBE! ACK! A SR20 T25 ON A 1.6L??!?!?!?!?!?!?!?!

If it had a slightly larger turbine I bet that torque curve would look like an old guy's dick.

That second dyno graph looks very familiar...:cool:

From personal experience, the DSM .48/.49 is good up to 200whp with a great-flowing system. ECU+3"exhaust will get you there. This turbo is out of steam by 15psi.

I've had several local dyno-guys get excited when they saw what turbo I was running. Universally commented, the .80/.64 mounted to an SR20 motor will make right at 250whp in a FWD application with full bolt-ons and a good tune.

With a .4ltr smaller motor, for-crap head design, and slightly less RWD driveline loss, you can expect to max out around 230whp on a 1.6 Miata@15psi... again with an ECU+3"exhaust. 1.8's will make practically the same with 100rpm better spool and maybe 5ftlbs across the board.

That second dyno-graph of the 1.6 was on full bandaids w/2.25" Borlas. I was heat-soaked after 6pulls and had to lift due to knock. But there was some great tuning done both on my fuel pressures, 02clamp, and Bipes settings. If I'd kept my foot in it, I'm guessing 210whp would have been on the table.

You can make the same power on a GT25r with smaller exhaust, less boost, and crappier tune however... and enjoy significantly better spool.

Overall, the SR20 T25 is (IMHO) the best bang-for-the-buck small turbo out there. You can get them for $100 all over the place, and everybody makes mani/DP's for T2 series pieces. The only shit thing about that particular Nissan OEM piece is the need to buy the ATP adapters for $80 or Dremel the flanges off to stick a coupler on them.

The 2g DSM turbo is junk, that's why everyone steps to a 16g when it dies. I guess it's ok on a 1.6, but it's pretty junky on a 2.0.

http://cgi.ebay.com/ebaymotors/_Car-....c0.m245.l1318

oops someone already linked it...

I am running a T25 thats .80/.64 and its fan fucking tastic. I couldnt have asked for more.

hey sam the turbo you sold for $100, did you sell that about a week and a half ago? because there was one that I was bidding on and someone took it from me in the last 10 seconds lol

I'm sure the SR t25 is a fantastic turbo for a Miata engine, they spool fast, can be rebuilt if needed, and they make pretty good power. As mentioned above they are also easy to find at dirt cheap prices.

i had a stock turbo from a 85 300 zx turbo

it mad great power for what it was and its wasn't 200 its was alot more

i have the turbo still if some one is looking for it

i went to a precision 61 turbo waiting to install it

The Z31 used a larger singleT3 turbo, definitely capable of a lot more power than a Z32 turbo.

Cool, I really like the Precision SC61 for inexpensive big power setups, I recently picked one up for our 240SX project.

what was the response on that 300zx turbo and will you be willing to sell me ur downpipe and manifold?

thanks guys 4 the help

I thought they were too small..."even for a miata"

:jerkit:

HUH? When did I ever say that an SR t25 was too small for a Miata???

if a t28 is small, what would make a sr t25 better suited?

http://www.boostedmiata.com/random/t3_vs_t25_wheel.jpg

the wheel on a T28 looks mighty big in comparison. But wait, that picture is labeled T3 50 trim! Well, as you should know, a T28 wheel is a t3 wheel. As T25 + T3 = T28. While still sharing the same standard T25 turbine.

If someone put down skyline t28 (.42/.48) next to an SR t25 (.80/.64) and made me pick, I'd take the t25 every time. I maintain my position that an RB20 t28 is too small when there are better options for the same price. Now if we were talking about an S14/S15 t28 or a GTi-R t28 (what I run) thats a completely different ball of wax.

But doesn't the skyline turbo have a T3 footprint? .48 in T3 = .64 in T25

Since A/R is defined as: the inlet cross-sectional area divided by the radius from the turbo centerline to the centroid of that area. And we all know a T3 inlet is much larger than a T25, so the numbers are not directly comparable.

And even if that is not the case, buy a sr20 turbine housing and put the t28 in it ;)

So, I maintain my position, that the turbine is the same, and the compressor wheel is a T3 wheel. Which makes the T28 a larger turbo with better potential.

Alright I guess its probably silly to debate this without access to compressor maps and/or same car same dyno comparison numbers anyway. :)

do you want me to post the compressor maps? Was my picture of the two wheels not enough?

Actually I'd prefer if you would dyno your car with both setups back to back just to be sure. j/k :D