turbo size for stock ka

[probe2436]

i have been reading on and off for a couple of years now and was wondering if what i have on my ka-t is good for what i am going to do. my motor is blown the compression is 80-90 on 3 of the cyl. and 150 on the other plus it smokes alot... duh. even like that with the bov leaking (which i am getting another) another leak in the back of the intake mani (around the stock fpr) it still pulles 4-5 lb on the boost gauge and can hear it in the bov when i let off the gas. is the turbo to small for the ka, this is what i could find on the turbo.
Specifications
Nomenclature (tag ID) t4 Rotary / FC3S FD3S
Inlet (exducer/hot side) T-4 Flange 70.1mm x 82.55mm (2.76” x3.25”)
Outlet (exducer/hot side) Sized for press fit or weld in V-Band adaptor
Inlet (compressor/cold side) Ø 76mm (3”)
Outlet (compressor/cold side) Ø 52mm (2”)
Exducer A/R 1.15 (sized for Mazda rotary motors)
Compressor Style 0.60
Bearing Type plain
Cooling/Lubrication Oil/Oil
Oil Supply Fitting NPT Threads
Oil Return Fitting Flange
Compressor major diameter Ø 69 mm

The “T4 Rotary” turbo is suited for perfectly for high exhaust energy motors. It is a perfect fit to the Mazda rotary motors. Larger Toyota, Honda, Mitsubishi, 4 and 6 cylinders seeking 475HP+ with very fast spool. This combination of AR (Hot/Cold) results in a quick spooling turbo for the Mazda motors. Other motors should consider resizing the exducer housing to change lower the RPM at which peak boost is achieved. We offer a wide range of supporting add-ons: Intercoolers, blow-off valves, supply lines, inlets, stainless intercooler tubing, intakes, waste gates, turbo manifolds, headers, etc.

T4 Rotary / FC3S FD3S

it came with the kit i bought. I am getting another engine with good comperssion that runs from a junk yard to put in while i rebuild this one. the waste gate is a 38 mm, the exhaust mani is a top mount ebay one that i had decked for good seal, ebay ic and i am running a fmu that has a 10:1 ratio and a 255 fuel pump stock injectors and ecu.
By the way the new motor is out of a 95 240sx do i have to change the head to make it work with my 91 240sx ecu. simple yes or no is good enough.

[biggie]

Seems a little big for my taste, but not horrible I guess.

[probe2436]

all i am looking for on the stock motor is about 250-300 hp with the current setup ....
alot more withe the built motor, is that turbo good for the stock motor setup or much better for the built motor set up.

[biggie]

Probably better for built. As said its a little big, so will have some lag. But would be much better at 15+ psi than it would be at <10psi.

[probe2436]

thanks alot. What size would you suggest for the stock application.

[biggie]

Just depends on what you want. Quick spool vs higher boost. If you want to keep the same turbo for stock engine and built engine, then something in the T3/T4 size (with T3 flange) would be the best option. If you want something just for the stock engine and would upgrade later you go smaller (even a T28 bottom mount setup would work well), but then if you are wanting more boost on a built engine you may need to go top mount later one and would be more money.

Decision is up to you. But for the most part a T4 flanged turbo on a KA is going to be for mostly drag applications on built motors running high boost. T3 for top mount is kind of the standard on a KA.

[probe2436]

I am more into drag racing but I would like to have a drag setup and a daily driver / drift setup (just starting to get into it). I will start to look for a t3 to start putting together.
thanks.

[GEO]

.48 A/R 57 Trim t3/t04b