expected power

[barnabylim]

Suppose I have a T25 and intercooler, at 12psi how much power can I expect at the flywheel?

[85EXABOY]

over 100kws for sure, i reckon close to the 110kw mark.

you dont need much for the stock setup to reach 100kws fly, tjhe t25 being the biggest factor in the higher power output.

[barnabylim]

What kind of things are needed to be done to take the stock setup to 100kW fly?

[85EXABOY]

an exhaust, intercooler and some boost will bring you there pretty easily.

[barnabylim]

but someone told me that the T2 cant sustain more than 7psi of boost. is that true?

[Nisman]

a t2 can run more than 7psi, i ran mine on 10psi for over a year.
the only problem is that anything over about 9psi the t2 starts producing alot of heat, meaning that every psi of boost over, the heat you generate will deminish power, so for more boost you will probably get the same power.
if you have an intercooler it will help fix the problem a little, but the heat will still be there.

[barnabylim]

oh yeah i get ya. Thanks!
So whats the difference between the T25 and T28?
and T25 and T25G?
Do I need an aftermarket ECU for the T25G or T28? or even T25?

[Nisman]

t25 is bigger than a t2, t28 is bigger than a t25.
the difference between a t25 and a t25g is that a t25 has a .49 a/r exhaust housing, while the t25g has a .62
this means that the t25g will flow a bit more air, and therefore is "bigger" than the normal t25, everything else about them is identicle, and you would not notice the difference between the two.

you dont need an aftermarket computer to put one of these turbo on, however if you go t28 you will notice alot more lag than the t25 or t2.
The advantage of aftermarket computer is you can fuel up the engine to spool the turbo and bring it on boost sooner, alot of people like the sudden kick in the back after a bit of lag though.

personally if you are planning on alot of future upgrades, worked motor, aftermarket ecu, cooler, and a fiar bit of boost i would definitely pick the t28.
However if the car is going to be a daily driver, stock motor, and less than 12psi boost, t25 is the go.
but that of course is my opinion.

Paul.

[barnabylim]

Thanks a lot for your info.
Now... If I were to get Stage 2 Cams, T25 and cooler,
would I be able to retain the factory computer?
And would I need injectors with that?
And also, is it a tough job to hook up water lines to the T25?

[joe]

also the t25g has ball bearings and the t25 doesnt

[Nisman]

the t25g has ball bearings and the t25 doesnt

WRONG!!
the t25g has a normal bush type bearing the same as all other t25's. The only way you can get ball bearing core is if you buy a gt25, which will cost you over $1300.
You can get a roller bearing t28 off a s14a 200sx however these will still cost you around $1000.


If I were to get Stage 2 Cams, T25 and cooler,
would I be able to retain the factory computer?
And would I need injectors with that?


yes the factory computer would run it, it just wouldnt run as smoothly as if the motor was standard. It would have a slight lump at idle and might not be as responsive.
as for injectors you could still run stock injectors provided you were not running more than 12psi boost.
Another alternative to injectors is to fit a vl pump inline, this will slightly boost your fuel pressure and help out the stock injectors.

[barnabylim]

Hi, sorry for all the questions,
but how much power can i expect with stage 3 cams and a T2?
or even stage 2 for that matter?
Also with the T25s, is it hard to install water cooling?
Also, how useful would an oil cooler be?

Thanks once again

[Nisman]

the main advantage of a bigger cam is that it allows the engine to flow better, so to really get the benefit you would probably need a bigger turbo and exhaust.
i dont think that 100kw would be out of reach if you ran higher boost though.

hooking up the water lines is pretty easy, the water feed can be tapped from the thermostat housing assembly next to the temp sensor, and the return can be run to the passanger side end tank of the radiator, i think it normally has a drain plug there.
if you use a bango fitting it will seal fine.
i have had no probs with mine at all and thats how mine is set up.

as for the oil cooler this is a bit of a debate.
i have seen a mate put one on and actually gain power due to the fact that the turbo and motor ran cooler, meaning slightly lower inlet temp.
most people think this is bull shit, but i guess that is their own opinion.
i would definitely recomend fitting an intercooler before considering an oil cooler though.

[barnabylim]

Thanks once again! So what kind of hoses are you using for the water lines?
And the oil cooler question, I was wondering if that would prolong the life of the engine/turbo?

[85EXABOY]

all of the top 10 e15et cars dont have oil cooling, you dont need it as the stock nissan one is fine. the other p[roblem with oil cooling is where you should plumb it in, you canot plumb it in the turbo drain pipe because that will cause the car to smoke like crazy.

as for cams, there are better things to do with your money, gettign a t25/t28 and a GOOD cooler are your highest priorities, then theres the dump and possibly new exhaust.

[barnabylim]

so Cams wouldnt work good for top end power?Also does the T28 bolt onto the stock exhaust manifold?
and also more importantly, how much would it cost to balance the crank, conrods n pistons?
and how much are ACL pistons n shot peened conrods?
and any special treatment for a nice hard crank?

[85EXABOY]

yes the t28 will bolt onto the stock manifold.

i dont know how much it would cost to balance everything ask sam i tihnk he did it himself.

since your doing internal mods you should do the cams at the same time or while your rebuilding the engine. i think it would be a hassle ripping the engine open or going to the extreme hassle of installing the cams while the engine is still inside the car.

if your engine is still inside the car and you want to install new cams its a dog of a job to do.

ohh i forgot to mention, doing all these mods and no aftermarket management will really send your stock ecu to the cleaners, adding cams to the equation is pushing it. unless you know what yoru diong in regards to mixtures and tuning then id go for aftermarket management, dont get me wrong the stok ecu has been proven to run impressive numbers but the owners know what they were doing.. ie DAMO's 13 sec run

[Nisman]

a full balance will cost you around $130 depending where you get it done, a full acl gasket kit including rings bearings, oversize pistons, everything set me back $550
i wouldnt recomend even attempting to balance your motor yourself, unless you have some experience and the correct equipment.
by the way, they balance, crank, rods, pistons, front pulley, flywheel, and clutch.

a CAM (there is only one) does work for up top, that is the main point of getting a regrind, the different size gives you a different band, stage 2, 3000 - 5000rpm, stage 3 3500 - 5500 (something like that anyways)

nitriding will strengthen your crank, but they are factory hardened, so unless you are going forgies and huge boost, i wouldnt bother.

i think the t28 of an s14 will bolt up, but you still need custom dump pipe.

[Nisman]

by the way, an oil cooler can be plumbed on the feed line to the turbo charger, it WILL prolong the life of both the turbo and the engine.
Not all e15 motors have the factory oil cooler, mine didnt, they are shit anyways, hot water is not an effective way of cooling hot oil.

[barnabylim]

Thanks dudes thats lovely info!

[BoOsted]

I would say that for 100-110kw, u will need aftermarket EMS, can be done without, but microtech etc. will instantly gain 20kw+....

But other than that, yeh 12psi should see the 100kw mark :D

Dan :afro:

[Marchoos]

Nisman, you know how you ran the factory T2 from its normal 6psi to 10psi, was that a noticable difference?

[Nisman]

shit yeh, i couldnt believe the difference.

just be carefull that your car doesnt ping, you will hear it. And i wouldnt recomend sustained boosting on hot days.