2.5s turbo kit question

[Shift_Altima]

IN the houston post.. someone said u can use a specV turbo on the 2.5 A/C's. Is that true? Don't the 2 engines have different camshafts and rods and stuff of that sort? A turbo wouldn't work would it..

[adidas2go]

A turbo doesn't directly connect to any of those parts. All you need is the same block. Which it has. Just keep the boost level low and you should be find on stock internals. between 5-7 psi will be good.

[Shift_Altima]

Can you have more boost if u intercooled

[adidas2go]

No. The purpose of the intercooler is to remove the heat in the air that the turbo creates while compressing it. Reducing the heat in the air increases the charge density (more molecules of air per cubic foot), thus increasing the potential for making more power. However taking this potential to far, increasing the boost level/psi to much, will cause a break down of engine internals. Having an intercooler will also decreases the tendency of the combustion process to knock (detonation/pre-ignition).

[TheBourneAltimatum]

it'll fit. but you want someone to custom tune it for you, because a main roadblock performance wise is the 2.5 ecu. get that taken care of and you'll be throwing down good numbers

[dvera23]

New to this but wondering would that turbo kit for for a 2.5 cvt? If so is would this be the kit that would work? http://cgi.ebay.com/ebaymotors...98910And why is that so cheap? compared to some that are 3000 and up?

[adidas2go]

New to this but wondering would that turbo kit for for a 2.5 cvt? If so is would this be the kit that would work? http://cgi.ebay.com/ebaymotors...98910And why is that so cheap? compared to some that are 3000 and up?

Well,

1. You need to build you own custom down pipe2. You need a buy and install a high flow fuel pump3. You need to buy and install a fuel management system4. You need to buy and install an oil tap system to feed the turbo oil5. You need tuning

Other than that im not really seeing to much wrong with the kit. However remember you get what you pay for. With this being an Ebay kit its most likely of very low quality and you will run into problems if you are missing something or something breaks because you are dealing with someone over the internet.

[Shift_Altima]

few more questions. Realistically.. how much whp do u get turbocharing the car? What is good psi to boost (5-7 or more)? And what happens to mpg when u boost thecar?

[Mr. Music]

Realistically.. how much whp do u get turbocharing the car? What is good psi to boost (5-7 or more)? And what happens to mpg when u boost thecar?

You can easily get 100+ whp out of a turbo kit. My brother's 2003 Z put out about 412 whp at 12psi and ECU tune. On our (2.5) stock internals, 5 is probably safe, 7 pushing it; but Jim Wolf Technologies makes internals for the QR25, and they also sell turbo kits for it. As for the fuel mileage, the more air that is being forced into the engine, the more gasoline is fed to the engine, thus reducing your mpg. The more boost or the bigger the turbo (or both), the less mpg you will get.
Modified by Mr. Music at 9:41 AM 2/17/2008

[Shift_Altima]

Well since I'm not seriously considering turboing the car now.. maybe in a few yrs. I guess that's all the questions i've got. But i'm happy to know that it can be done.

[Shift_Altima]

One last thing. Realistically speaking.. to get this 2.5 up to around 300 at the wheels.. would u need new internals and all that or can u use stock internals and still have a long engine life? How much would this whole project cost for a QUALITY kit and installation

[skiski329]

you are dumping soooooooo much money into this. why diden't you just get the 3.5 V6???

[adidas2go]

That would be a 160 hp increase. You would absolutely need forged internals at that point. For that much hp you are looking at 15 psi with an incredible tune and forged internals. Quality parts from internals, turbo kit, exhaust, fuel, fuel management, tune, install. Its gonna have to be in the upwards of 11k-12k.

[Shift_Altima]

lol not worth it.. I have a freind with a GTI and he has a 1.8 liter engine stock 180 hp and its up to 340 and its a stage 3 with stock internals. How does that work?

[Mr. Music]

15psi and a massive turbo. Getting 300 whp AND reliability out of the qr25's stock internals is not going to happen. The 3.5 doesn't even make 300 hp at the flywheel. If you'd like to read up on some of the things it takes to make the QR25 a bit stronger for turbo applications, these articles will give you an idea.

[Shift_Altima]

So at 5psi.. downpipe.. new catback.. new headers.. how much hp would it be.. to the flywheel that is. I can do the conversion to the wheels myself.

[skiski329]

lol not worth it.. I have a freind with a GTI and he has a 1.8 liter engine stock 180 hp and its up to 340 and its a stage 3 with stock internals. How does that work?

WOW think of the turbo lag LOL

[cartersaltima]

anyone think an SR20DET or a RB25DET would be swapable in the 2007 + altima?

That might be an alternative instead of putting a Turbo in the QR put a more Turbo Friendly Motor in.

insight anyone?

[adidas2go]

So at 5psi.. downpipe.. new catback.. new headers.. how much hp would it be.. to the flywheel that is. I can do the conversion to the wheels myself.

well having a turbo will eliminate the header. The turbo itself will be connected to a matched header and the other side will be connected to the downpipe. 235-250 hp with a good tune.

[Dollarmoney]

SR20 is a RWD right? and the RB25 is AWD...

Anything is possible but I bet it would cost you an arm and a leg.

[cartersaltima]

lol unless it did magically mounted right up with the transmission. Yeah I just had a quick thought but yeah. Guess it wouldnt work as smoothly as I thought it would like in my head

[skiski329]

or you could sell your altima and take that money for the turbo and or Motor and get a lotus! LOL

[Shift_Altima]

Ya. This turbo project looks hopeless. 250 to the wheels is still not that much.. for the 5-6 ill drop on a kit i can jsut get a v6.

[cartersaltima]

Yeah. I think ill just stick with the QR25 for now until i can just get my G37

[Shift_Altima]

I want a faster car though. Parents didn't like the idea of a v6.. besides the intakes exhuasts and headers.. anything else other than forced induction u can do?

[Mr. Music]

I want a faster car though. Parents didn't like the idea of a v6.. besides the intakes exhuasts and headers.. anything else other than forced induction u can do?

An ECU tune would be the most effective. That can safely give you 20-30 horses out of a box, and much more if it is done specifically for your car. Don't forget the giggle gas: nitrous always helps. If you have a fat wallet, you can use the same internals as you would for a turbo kit, and throw a direct injection setup on there, and your set. That combination can give you as much or more power than a turbo, if done correctly. But of course, doing it correctly is the hard part.However, your best bet would be to go buy a Viper!

[Shift_Altima]

Does an ECU tune have any harmful effects on the engine? And im pretty sure there are no tunes right now for the qr engine.. is there? But no nitrous shots for me.. just not my thing. I dont know what direct injection is though..

[Mr. Music]

Direct injection is kind of like having a second fuel injector, but for nitrous. As of now though, I'm sure there are several tunes for the QR25, but probably for Sentras, not Altimas. They can screw things up in the long run if it is too much of a tune. (Same principal as with the turbo: to much power for the stock components to handle. Components can fatigue over time and will eventually break.)

[Shift_Altima]

how do you go about doing an ECU tune like who do u go to?

[Mr. Music]

Your best bet would probably be contacting companies who make tunes for the sentra se-r's and spec-v's, and seeing if they are interested in making a part for the altima. If you want a custom tune, I don't have a clue as to what to do. Somebody else have any ideas?