1.8s with Sr20 T25s. Some info please
 

Ive done some searching and have seen only acouple dynos/threads. ive heard they are a good cheap option...ive also heard they are far too small.

My goal is 220whp. anyone have using the Sr20 t25 that would like to share their setup and opinion of it ?

Look at my signature. 225whp with a SR20 turbo. Very cheap to obtain, cheap to rebuild, fast spool, etc. The dyno was on a stock '99 1.8 liter with 460cc injectors, running approx 12psi. What year is your engine?

Don't look at my dyno thread. I'm at 155 with power that flat lines at 5000ish rpms due to a crappy 2.5" exhaust choking it off. BUT it shows that with a smaller engine, 2psi less than thirdgen's dyno, and a shitty exhaust I'm only 65hp off your goal.

Just do yourself a favor and get 3" exhaust and hopefully no cat.

95 with original engine at 120k, ive done the Exhintake mod to it already which I cant seem to find info on if its turbo friendly

I have 2.5" exhaust BTW.

i got 225 rwhp with a pretty aggressive tune, 2.5" dp, 3" exhaust, 550cc, fmic

i got 206 on a different dyno with stupidly conservative timing.

Both on a stock 96 1.8 and about 12-14 psi

Dirt cheap and pretty easy to rebuild too.

Look at 240's torque as compared to mine. We have basically the same HP, but his car should walk mine due to the torque...for now ;)

SR20 T25 turbos are an awesome low-buck option for 200-220whp.

y not go with a cheap ebay t3?

I have since backed down on my timing.

Although now with my new motor at least I am 9:1 compression. . . And I still have water/meth kicking around waiting to be installed :giggle:

I'm using a t25 and love it.

Thirdgen:

https://www.miataturbo.net/attachmen...ine=1345825575

Shuiend:

https://www.miataturbo.net/attachmen...ine=1345825575

Im picking up a rebuilt sr20 T25 this weekend hopefully. I think the t25 will be a good turbo for me, im hoping ill be happy making only 100whp more than I do now lol

torque really seems to fall off pretty hard on the top end with these turbos. question to those who are using the T25, does it still feel like the car pulls pretty well all the way to7k

pulls better than stock, but you notice the lack of top end. but the low end is FUN. it's a great street turbo.

T25s making around 200-220whp is that setup that can be used on the track reliably ? or are they so inefficient at those power levels that they can only be used for occasional abuse on the street ?

you will run into similar reliability issues as the bigger turbos on the track. Studs backing out, heat issues, etc etc.
I upgraded to the inconel M10's and and gave up on running gaskets on the downpipe surfaces.

My last track day was at wastegate pressure with the original m8 studs and shit got loose.

Savington ran a 2554 on the track for a good while. I believe his turbo was fine, he just could never get it to stay connected to the manifold. This was long before he made the Inconel studs. If you are running TSE Inconel studs I would think a 2554 would be fine. The only downside to the turbo is that the topend torque drops off a ton.

In case you were wondering, gt2554 is pretty much the same as sr20 t25. I think the turbine wheel in the sr20 is actually .1mm bigger or something. They are so close in size it's ridiculous. If you're concerned if the sr20 turbo will make enough power, find a blown s14 turbo with a good compressor and swap the compressor and wheel. The basic sr20 t25 uses a 56mm 60 trim compressor wheel, while the s14 uses a 60mm 60 trim wheel. The upgrade takes it from a gt2554 sized turbo to a gt2560 sized turbo.

How close is the turbine side of the T25 (.64ar) to that of the gt2560 ???

I know you can get T28 compressor wheels installed into T25s for under $300. If that will make my t25 flow like a gt2560 I just might have to do it.

These are specs of the common SR20 turbo:
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

These are specs of the S14 turbo that has the larger wheel:
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.
Center Section: Ball Bearing

Same turbine/ wheel size. Larger compressor/ wheel.

Specs on the GT2554 from the garrett website:
Compressor: 54.30mm 60 trim wheel
Turbine: 53.00mm
Center Section: Ball Bearing

Specs on the GT2560 turbo from the garrett website:
Compressor: 60.10mm 60 trim wheel
Turbine: 53.00mm
Center Section: Ball Bearing

It appears that the SR20 turbo is actually a bit larger than a gt2554. It also looks like garrett uses the same turbine/ wheel for the 2560 and 2554, just different compressors/ wheels. Makes sense to me. Larger compressor wheel means larger volume of air will be displaced.

For that same money you could get a s14 T28 which is single ball bearing ...

EDIT... 3rd gen covered it

I have been looking for an s14 t28 forever. Let me know if you find one. I want it.

Todd, do you ever look at Zilvia.net for a s14 t28? They pop up all the time there.

Ray

Really? I didn't see any while I was looking for my t25, but then again it didn't take long before I bought one. How much do you see them going for?

Adam, I think the last time I checked there was one for $400, but if I remember correctly he said it could probably use a rebuild. I don't know if there are any currently for sale but that would be the first place I would look for one.

Ray

I had one. Sold it with my SR when I parted out my 240. Regret it a lot. They are somewhat hard to come by.

Is this what you're looking for, Todd? CT S14 T28 ball bearing. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Ray

Yes and no...I'm looking for "selling my blown s14 turbo. The chra is seized, but the compressor/ wheel is good....$50"
Let me know when that gets found.

do you just want a compressor wheel? I have a 50 trim t3 wheel and compressor housing you can duct tape to your chra...that'll make it a t28.

https://www.miataturbo.net/attachmen...ine=1346415477

Lol @ duct tape...pm me brainy, if serious.

if i can find it :)

For anyone looking for a cheap T25/T28, I was around 240's before miatas. This one works great and is probably the CHEAPEST you will find anywhere that isn't from ebay.

*ISIS T25/T28 Replacement Turbo - Nissan SR20DET - Enjuku Racing Parts, LLC

If you want a 2871 sized turbo the same company makes this turbo as well.

http://www.enjukuracing.com/products...n-SR20DET.html

Final edit? - I think these (both links) are journal bearing not ball bearing, fwiw.

A quick google search reveals that these turbos are actually really good units. The warranty on them is rock solid as well.