turbo newbie

[scuba_sean]

hey, i started a thread a while back about a twin turbo install on a 1990 KA24E S13, but i was informed that this wont work. So... im gonna go down to the auto recycler's, and find an old turbo, and get a manifold/headers made at the local exhaust place. I want someone to give me a list of the bare essentials i will need for running like 5-6psi of boost.

[sapix @ RHIT]

Your going to need Injectors, Fuel Pump, and Some sort of Fuel Management to supply fuel to the engine. Providing the engine with enough fuel is the most important part of adding a turbo to an engine.

[Tony Starks]

I've read in another post where some of yall where talking about an A/R housing.What exactly is that and what is it's function?I only know of the turbine housing,compressor housing,and shaft housing.Is the A/R housing just another name for one of the housing I mentioned or am I missing something?Thanx

[ITR_KILLR]

A/R is not a part, it is like a measurement for turbo housings. every turbo has A/R's, the A/R of a turbo affects what HP it will support, as well as spoolup characteristics.

(better explanation later, busy at the moment)

[wanabe240esx]

baically, the higher A/R number, the more(air) HP it can support, but as it goes up, so does spool-up time

[ITR_KILLR]

also closely matched comp and exh housings = an efficient turbo, but when you use different A/R comps and Exh housings to make hybrid turbos, you can make turbos that spool quickly, yet still produce big power

[Tony Starks]

Thanx

So what does A/R stand for?

air/?

[george]

dude why dont you go quad turbo? nitrous, supercharger ?

[95_240sx]

The A/R has to do with the volume of air versus the amount of air flowed through. Rob at enjuku told me the other day but i completely forgot.

Most likely wont need to get a stand alone, fuel injectors or fuel pump. For minimal boost, 4-5psi, you could get a JWT computer and tell them what your doing. Be sure to get a good Boost gauge, Boost controller, A/F ratio gauge, and EGT gauge, and an ignition wouldnt hurt either.

Rick

[huguetpj]

If I'm not mistaken, and I remember my Corky Bell alright, A/R stands for Area/Radius

Meaning the area of the turbine shaft vrs the distance between the center of this area and the turbine center.

All turbos should/do have an equal A/R at every point along the shaft, which makes for smoother airflow (?).

[ITR_KILLR]

i thought it was area ratio, but ok

[huguetpj]

I'm pretty sure it's area/radius, I'm trying to imaging the diagrams in Maximum Boost. I'll look at the book later and if it's not I'll correct myself.

[ITR_KILLR]

A/R, or area ratio, is the way compressor housings and turbine housings are sized. The bigger the A/R numbers, the bigger the housing size. Typically a bigger A/R will produce better flow but induce more lag, partially because of a lower internal gas velocity that the bigger diameter creates. It's kind of like spraying a pinwheel with water from a garden hose. If you put your thumb on the end of the hose to make a concentrated spray, that spray can make the pinwheel spin up faster. But at the same time you are creating more backpressure inside of the hose by choking off its flow.

how about that:yesnod

[Tony Starks]

Thanx,I think I know what yall are saying.It's like the area between the outer diameter of the turbine and the inner diameter of the housing (where the gasket is).

yes,no,maybe?

[asad]

A/R, or area ratio, is the way compressor housings and turbine housings are sized.

A/R is not area ratio. If it were area ratio, it would be AR, not A/R. A/R stands for area/radius, as someone mentioned earlier, because it's derived from these measurements on the housing scroll.

BTW, it's a little known fact that larger A/R compressor housings are actually more efficient at LOWER boost levels. So if you want to run high boost, use a smaller A/R compressor housing. Counterintuitive, yes, but it's the truth.

Asad

[huguetpj]

Seems I remembered my Corky B. correctly

Thanks Asad for clearing that out...