T3/T4 and boost

[burnout 180]

i don't know if this is the right section but i have a jdm gtir pulsar and i have two questions.

1) how much boost can i run on stock internals and stock t28?

2) also i was thinking of swaping my stock t28 for a (turbonetics Turbo t3/t4, .50A/R and .48 exhaust housing .50 trim) and i wanted to know if that is a good turbo for the sr or is it to big?

[nametakennow]

1) As much as you can push out of that T28 efficiently and then some. I think they max out efficiency around 18psi, but I don't remember exactly.

2) You'll have to get an adapter to put that Turbonetics turbo on there, as it has a different bolt setup. Dig around the internet or just ask Turbonetics and they should be able to help. T3/T4s aren't terribly uncommon on SRs. If you don't mind a dose of lag, it'll definitely increase peak power.

[burnout 180]

Alright the t28 can run max of 18 psi but how much boost can a stock gtir take that is what psi is safe to run on stock internals and injectors etc

[RED_DET]

Pushing the envelope to say, the GTiR can problem handle around 500hp. But that is with upgraded injectors, turbo and maf. The stock setup of a GTiR is good for 300-320whp all day long. You can run the T28 at 18psi, but I wouldn't recommend this for daily abuse. Maybe for dyno's or track days. The turbo goes out of its efficiency range around 1.1 bar(16lbs). The t3/t4 setup you mentioned is a good way to get around 350whp, but bigger injectors are needed because the 444's even at 4 bar will be 100% duty cycle and bigger maf. You can run around 20lbs of boost on the t3/t4, with race gas. Anything over 16lbs on the sr, race gas is recommended. Might as well be safe than sorry. You can also upgrade the a/r on the t3/t4 to make more horsepower if 350 isn't good enough for you.

So in summary:Stock gtir block can handle 500hp*pushing things*The gtir T28 makes good power until around 16psi.The injectors are running @ 3bar and they are good for 300+whp and if you run them at 4bar fuel pressure, they are good for 330-340whp.The maf is good for around 300whp. Anything more and a bigger maf is required or boring the gtir maf works as well. Bored GTiR maf is good for 340whp.

Hope this helps.

[burnout 180]

Is the pulsar gtir engine a sr20det? because it looks like a sr20det to me

[RED_DET]

SR20DE motor with factory turbo=SR20DET

[burnout 180]

so the pulsar gtir motor is a sr20det well how come the sr20 uses side feed injectors and the pulsar uses top feed injectors.

[ScottyK]

i thought the gtir sr20 was a fwd motor?!?!

[RED_DET]

It's just a specific design for the motor. The roller rocker sr20de in the the B15 and P11 vehicles have top feed injectors as well. Doesn't make them any less of a SR, just a design. The GTiR also has quad throttle bodies that is shared with no other SR.

[RED_DET]

Who said it wasn't?

After looking at his cardomain site, I see where this question is going.

The answer is NO you can't put a GTiR motor into a 240.

[burnout 180]

I didn't have any such idea of putting a sr in my 180sx. I don't want to talk negatively about the sr since i am on the sr forum so i'll just say that i love my bullet proof ca.I was just getting some general knowledge about the GTiR because my friend has a jdm pulsar GTiR a we are doing some work on it. We need some injectors and i was trying to find out if the GTiR injectors were top feed low impadance just like the ca because i have some after market 550cc ca injectors and was thinking of using them.From what you said sounds like they will work so thankyou.

[RED_DET]

Yes the GTiR injectors are top feed low impedence.