AusS2000

Now that quite a few turbo kits and custom installs are about I thought I would start a thread discussing turbo sizing for the F20C.

I'm currently SC'd but would like to start piecing together a turbo system over the next few months. What I'm not too sure on is what size/kind of turbo I should use, and more specifically A/R ratios for the turbine and compressor.

What I would like to achieve is low end torque and minimal lag. My car is a daily driver with occassional circuit work. I'm not in any way interested in 1/4 mile times.

I already have an AEM EMS and 550cc injectors so tuning isn't a problem. the motor is currently completely stock (as opposed to built) so my aims are 350hp but nice low end.

I'd really like to hear from those of you that have experience with turbo charging this motor and have played with different options.

Slows2k

I'm in the middle of doing the same, with similar power goals. Iv'e been talking to a local tuner who has more experiece than I. As you allready know most of the "kit" turbo's are t3/t4's.

A 60-1 hi- fi will make well over 350hp, and isnt the happiest at lower pressure ratios ona small displacement engine.

The Garrett GT28RS fits the power goal, but the T25 flanged exhaust will require a custom manifold outlet flange.

I know the RS-R drift car is using a version of the GT28, but I don't know what size A/R it has.

AusS2000

Sounds like we want to know the same things.

I'm not too fussed about custom manifold outlet flange as I need to fabricate my whole manifold anyway. I might have a look at the GT28RS. That's the one affectionately known as the Disco Potato isn't it.

One of the things that confuses me most is the different names for turbos made by a common manufacturer or turbos of equivalent size. If I'm not mistaken Garret make T25, T28, T3 and T4 (and so on) and they are generally increasing in size. Many of the other brands are rebadged Garrets or named along similar lines.

But some of the more popular options for our engine are T3/T4 hybrids. They use the turbine of a T3 but the compressor of a T4. And then you have a range of Trims for the compressor and A/Rs for the turbine.

All very confusing.

Slows2k

Yup, the Disco Potato is a GT28RS.

timg

Right now I'm running a GT30R(GT3037) with a 0.63 a/r turbine housing. It's a great combo that spools VERY quickly. I do have a 2.2 though... I'll be switching to a 0.82 housing and a slightly lower c/r soon.

Tim

hboy7777

sounds like you should definately get a hybrid turbo. they have the fast spooling t3 turbine section with the airflow of a t4. most turbo systems are going to make alot more torque down low than a cent. supercharger so your torque needs are already there. the turbo i came to find best suited for my s2000 is a t3/60-1 turbo. the turbine a/r was a bit of an issue when buying. but i went with a .82 that has a little more lag but alot less backpressure. i also bought a .62 housing to experiment with if i dont like the outcome.

dut

- my turbo is a t3/t4 60-1, not sure what the trim is though...
- I know that ultimate-racing wouldn't tell me that much either

f20kills

I am currently running a garret t3/60-1 with .82 A/R.
First gear full boost is around 5000 rpm.
Other gears its more around lower 4000 rpm.
I do love how the turbo never makes boost while drivng around unless I am on the gas.

Stale_Hotdog

Why is it known as "Disco Potato"? That's such a cool nick name!

AusS2000

See this link.

Just read it myself to day and it's pretty cool.