how much horsepower???

[SLDWYSJDM]

Just a quick question. if i turbo a stock KA, how much horsepower should i get from it???

[Evo8kid]

safely on about 7-9 psi would put you roughly a little under 300. But im no nissan guy

[NOPSTNS]

broad ass Q man...narrow it abit....whats left stock? internals? fuel? computer? u can bolt a turbo and run the pipes and make 24 hp. then again, a ruff answer for a ruff q is best, 300 sounds nice, what r KA's stock? 160? meh 300 is high for a ruff guess but (joke warning, everyone go get their sense of humor...) since nissan is da second best companie evar! (first would be subaru of course) then id say itll make 500 hp! but if it was a ej20 or ej25 or blah blah blah itd make 10 billion hp!

[Evo8kid]

well im just speaking from experience. 96s14 made 287 (or something like that) i THINK on 7 lbs, if not 7 then 9. stock internals, just supporting mods

[SLDWYSJDM]

alright, a 1989 240sx s-13 with a fresh rebuilt KA with beefed up enternals. ex. new headgasket new pistons new rods and a new Apexi N1 evolution exaust. how much power will i get out of that

[james_ls]

Stage 2?

What the hell defines a "Stage 2 Turbocharger" ??

[Wiisass]

Originally Posted by speedfreak

alright, a 1989 240sx s-13 with a fresh rebuilt KA with beefed up enternals. ex. new headgasket new pistons new rods and a new Apexi N1 evolution exaust. how much power will i get out of that

Maybe 160rwhp, maybe.

[yellow2000S/R]

Originally Posted by speedfreak

alright, a 1989 240sx s-13 with a fresh rebuilt KA with beefed up enternals. ex. new headgasket new pistons new rods and a new Apexi N1 evolution exaust. how much power will i get out of that

You can run safe on stock KA internals around 300 whp... Very Very few are running closer to 500 w/ stock internals still. It all depends on how good the tune is. But even regardless of the tune, some guys still pop at 300, some just get "lucky". The guys running the higher hp have different computers or a stand alone so they get full control of everything.

You put better internals including bearings and replace seals (just a full rebuild), and have a larger turbo, you can see 400-500 whp. Get used to the upper 200/300 range first tho... You don't want to go to a different setup with that large of a step in power.

Originally Posted by Wiisass

Maybe 160rwhp, maybe.

LOL...

[Wiisass]

Who's making close to 500 on stock internals? Piston ringlands don't hold up that high. Unless stock pistons have gotten strong since when I used to care about engines.

[turbo4g63]

build it then strap it to a dyno...thats the best way to do it. most likely if left w/ stock internals and low boost>>depending on how good your tune is it will make between 250 to 300 whp

[foss]

You'll make around 6,754hp which calculates to precisely 270-280rwhp on a street tune.

[agoodall]

Originally Posted by Evo8kid

safely on about 7-9 psi would put you roughly a little under 300. But im no nissan guy

those are some BIG numbers....roughly a little under 300 hahaha no shizzle

[highmilehatch]

It really depends on how big a turbo you decide to run. Something larger will make the same power with less boost, and something smaller will make the same power with more boost.

[pinkarrowsnow]

I plan on beefing up my internals eagle rods je pistons and a t3/t4 with 550cc injectors and am shooting for 300hp. And my engine only has 28k so call me crazy haha.

[Gregory]

Originally Posted by highmilehatch

It really depends on how big a turbo you decide to run. Something larger will make the same power with less boost, and something smaller will make the same power with more boost.

If you are running the same boost, the size of the turbo will not make it more powerful unless it's pushing more than the smaller one can handle. In fact, your spool will be much slower with a larger one.

To run a single bar, you don't expect to put up bigger numbers with a bigger turbo necessarily.

[highmilehatch]

Originally Posted by Gregory

If you are running the same boost, the size of the turbo will not make it more powerful unless it's pushing more than the smaller one can handle.

Right, bigger turbo can flow more air at same boost level.

More airflow obviously means more power potential at the expense of response. It's all about finding a good compromise.

[Gregory]

Originally Posted by highmilehatch

Right, bigger turbo can flow more air at same boost level.

More airflow obviously means more power potential at the expense of response. It's all about finding a good compromise.

Correct me if I'm wrong, but my understand was that 7psi is 7psi. How is it flowing more air without creating more boost? If it's pushing more air into the system, wouldn't it create a greater psi? Maybe we just aren't understanding eachother.

[SpendOne]

A big turbo will NOT necessarily make you more power unless you get it into its effcientcy range. PSI doesnt mean anything, its all about airflow numbers...example:

my old turbo - 20g: I would see full boost (30psi) at about 3750-3800 rpms. Max Airflow @ 4000 rpms at most.
new turbo - 60-1: I see full boost (24psi) at 4100-4200 rpms, but max airflow comes in @ 6000 rpms.

[Action Park]

93
7 psi is 7 psi inside a tire. However, an engine is not a closed system that is pressurized, the airflow is constantly moving. A larger turbo may be pressurizing the intake the same as a smaller turbo, but it is essentially flowing more air into the engine if it can take it. In other words, same psi, greater air velocity, more air. An engine can only take so much airflow so there comes a point where a turbo is providing too much flow and surging will occur with a compressor that is too big. Conversely, an undersized comp. may not provide enough flow and this can also create a drop in psi. Effeciency also will come into the picture as a more efficient compressor will make the same psi without heating the air as much. This of course leads to a denser air charge.
93 93/93

[highmilehatch]

I think you guys are making this more complicated than it really needs to be.

Turbos flow a certain amount of cfm at a given pressure. 10 psi from a t3 won't flow the same amount of air as a t4 sized turbo at 10 psi. The available oxygen content to react with the fuel is much higher with the larger turbo. An engine doesn't know what boost is. It doesn't matter.

Lets take a 1.8 liter B18C GSR Vtec engine. Lets say it had a greddy turbo setup with the smaller mitsu based turbos. It might make roughly 225 whp at 12 psi. It will spool fast and fall off up top as the engine starts to breath in the higher r's and the turbo can't keep up. Would make for a fun little fast spooling street car without much pull up top but not much lag.

Now change the turbo to someting like a T3/T67 with a full-race manifold. Now the engine will make around 350-375 whp at only 12 psi. Yes, there will be lag. This would be good for drag racing as you would constantly be up in the high r's when you shift and land in the next gear.

Your not going to have the fast spool of a smaller turbo, and the power potential and the larger one. That's why you have to size your turbo accordingly for what your doing with the car, and find the best compromise between power potential and response.

Those numbers above aren't set in stone. Things like camshafts, combustion chamber design, compression ratio, octane, displacement all affect the numbers.