rb25det and gt2871/gt3071/upgrade stock wheel

[240sxed]

Ok, so im kinda interested to see what kinda stuff is avalible to fit the rb25det with least modification as possible.

I was thinking of keeping stock exhaust manifold, use the t3 flange.

Get a gt2871 .86 a/R with t3 flange/internal wg (hks actuator).

or a gt3071 .63 a/R t3 flange/internal wg mb weld a external?

then... how do oil and coolant lines work?

then exhaust pipes.. vband? custom piping?

As far as intake and intercooler pipes off the turbo... also custom ?

I want to use as least parts as possible.

And the last option, what about upgrading the stock wheel, what gains have people made keeping the stock housing, but upgrade the wheels? thats easiest as far as oil/coolant and intercooler/exhaust piping right?

[matt_calgary]

In my expierence with dealing with re-building turbos and what people have told me, its usually on a few hundred dollars more to get a decent brand new turbo then rebuild your stock one. A steel wheel on the RB25 will probably only allow a couple more PSI safely.

[240sxed]

In my expierence with dealing with re-building turbos and what people have told me, its usually on a few hundred dollars more to get a decent brand new turbo then rebuild your stock one. A steel wheel on the RB25 will probably only allow a couple more PSI safely.

Well i've heard of changing the wheel or clipping it or doing something to yield more hp, yet keep same housing.

[matt_calgary]

Clipping it? I'm not familiar with what you are talking about. My opinion, go with the new turbo, it's something to not have to worry about later. What are your HP goals for this car?

As for your lines, a lot of threaded caps(not sure what they are called officially) for oil input/return can either be custom put on braided lines or lots of pre-made kits are available. The stock linesmay work but I highly doubt it and its just an excuse to just get braided ones!

[240sxed]

Clipping it? I'm not familiar with what you are talking about. My opinion, go with the new turbo, it's something to not have to worry about later. What are your HP goals for this car?

As for your lines, a lot of threaded caps(not sure what they are called officially) for oil input/return can either be custom put on braided lines or lots of pre-made kits are available. The stock linesmay work but I highly doubt it and its just an excuse to just get braided ones!

Yeah i figured stainless steel braided, but do people have info on connectors? like, what is the part which connects to the block coolant/oil whats the measurement if i were to have um custom made or even ordered from a kit.

[rbsileighty]

Clipping is bad... please don't do it... old way of making a turbo flow more and is really inefficient.

As far as lines go, just make the braided for coolant and oil like mentioned... get the fittings by taking the old ones to the place around you that stocks fittings and have them either find new ones for you or have your old ones brazed onto AN connectors. The fittings for the turbo will obviously depend on what turbo you run.

As far as the turbo... what's your power goal? That's a good place to start. GT3076 .8X a/r is sticking out in my head, but it really depends on what power goals you want. I get this one b/c it's very similar to the 3037 from hks and a guy on the aussie boards has done a lot with that one on a 25... and the 3076 should have better response.

[backsidethree]

[QUOTE=rbsileighty]Clipping is bad... please don't do it... old way of making a turbo flow more and is really inefficient.QUOTE]Just for my own info, what is clipping?

[rbsileighty]

definited by wikipedia - Another common method of equalizing turbo lag, is to have the turbine wheel "clipped", or to reduce the surface area of the turbine wheel's rotating blades. By clipping a minute portion off the tip of each blade of the turbine wheel, less restriction is imposed upon the escaping exhaust gases. This imparts less impedance onto the flow of exhaust gasses at low rpm, allowing the vehicle to retain more of its low-end torque, but also pushes the effective boost rpm to a slightly higher level. The amount a turbine wheel is and can be clipped is highly application-specific. Turbine clipping is measured and specified in degrees.

Clipping also makes it so that the wheel is less effficient... which I'd say outweigh its gains

[240sxed]

So...no upgrade avalible for stock intake or exhaust wheels? I don't need much more power, plus i feel mine will go out sooner, rather than later.

[rbsileighty]

Yes, there are upgrades for the stock turbos... but the ones I've seen from AU seem to cost almost as much if not the same as the Garretts turbos.

[matt_calgary]

Yes, there are upgrades for the stock turbos... but the ones I've seen from AU seem to cost almost as much if not the same as the Garretts turbos.

Exactly the reason I told him to just upgrade

[240sxed]

Ok... well i figured i'd throw down some rough estimate pricing, msrp prices... i could probably do better

gt3071 or gt2871 - 1100 ishhks actuator - 100oil lines, stainless still braided - 150ish?exhaust dp w/ vand ? other options ? - 150-200inlet/outlet on turbo - 100 in piping

good estimate? make modifications

[rbsileighty]

I'd say GT3076 for a 25... based on numbers it should be a great midrange turbo for that displacement.

Unless you are switching to a T25 flange I'd say you're probably going to have to run an external wastegate on any of these turbos.

I'd bump the price 500 on top of what the wastegate and manifold are going to cost you... then if you have the cash... go for it. Gives you a safety factor since you'll always end up haveing to buy other misc items.

[Shocker]

dont forget about injectors, and possibly some type of engine management.

[240sxed]

good point.

dont forget about injectors, and possibly some type of engine management.

..

but i got quoted on a t3 flange.... with a internal wastegate i checked at two places.