How Much Boost?

[Room42]

I am in the process of building an rb2530 with 2 stock r33 s2 turbo's on a custom manifold. How much boost would each turbo run before the z32 afm hit 5.2? I'm going to suck through one afm. They will be running off 3 cylinders each.

[Shazza24]

10-12psi if they are stock turbo's (non-steel wheels) or you will run the risk of damaging them/shortening their life.....

EDIT: not sure on the AFM

Edited August 6, 2011 by Shazza24

[Moodles2]

Max will be 500hp, it's the max theoretical resolution of 1x Z32 AFM

[The Mafia]

Yeah, I wouldn't bother with the standard r33 turbos because they like to fly apart beyond 12psi.

It's kind of a waste bolting them on to just run 12psi. A single Garrett item with an internal gate would be far cheaper, easier, and a lot less mess under the bonnet.

I'd you're set on twins, get decent twins properly matched for performance vs early spool time.

But, a z32 and two standard turbos at 12psi wouldn't max a z32.

Just advice mate - you need to rethink you're strategy because what you're doing isn't going to be worthwhile, especially on a rb2530

[R31Nismoid]

Just advice mate - you need to rethink you're strategy because what you're doing isn't going to be worthwhile, especially on a rb2530

+1

The sheer cost and effort to get twin stock turbos onto a RB25 head is just not worth it for a start.

Let alone the failure risk and thus motor...

[045HOW]

im a fan of twins but this is ridiculous.

do it properly or not at all.

you can get proper twins or a proper single with the right money.

or you can go cheap and get twin chinas or a single china.

but this is too cheap lol..

[defari]

More like 10psi

[paulr33]

i reckon your idea is crazy and risky and will give a crap result

but your engine

but i do think twin gt25's ECR33s will max a SINGLE z32 airflow meter

or come very close

[defari]

twins = more parts that can go wrong / fail = $$$$$

[045HOW]

twins = more parts that can go wrong / fail = $$$

AKA:your ceramic nightmare

amirite?

[GTSBoy]

Well, they're supposed to be good for ~200rwkW each, which is a bit more than the Z32 meter will measure. It's just a question of whether you can drive one to produce 200rwkW with only 1.5 litres behind it.

If it were me doing bodgy cheap twins like this, I'd use some TDO4s off a WRX or something similar. They're a bit smaller than the RB25 turbos, will spool better, will run to higher boost if needed to make the flow&power.

Stilll a complete nightmare to do compared to the expected results though.

[defari]

AKA:your ceramic nightmare

amirite?

[Room42]

I am aware of the risk involved with ceramic turbos but as they wouldn't be seeing a high boost level with 2 of them this wont be an issue. My current turbo has been seeing 14-16 psi at least twice a day if not 20 times a day for 6 months and it's fine. That argument aside, there are some good reasons that I am doing this turbo setup. The cost of doing this is bugger all. Another stock turbo with lines is $150. A head flange and 2 t3 flanges cost me $100 from ebay. I'm getting all the pipe for the manifold and exhaust from work for free. I currently have one hks split dump that I've been using for a while now. I need another split dump or I could use the stock ones. The exhaust and manifold fabrication will cost nothing more than my good company and some drinks at a mates house. The water and oil line setup is another negligible cost. Intake piping is what it is. Silicone bends aren't that cheap but we all know what they are worth. Tuning is up to me. I'm going to tune the turbo setup on the current rb25det in the car and then swap it afterwards to the bigger motor. So it all comes in at less than $500. It will be fine aye. It will be neat and wont blow up Also as far as effort goes its not a lot in my book. As the cost is so low that means less wages spent. To get a "proper" setup I would be looking at a minimum of $3500. That's more work in the end. It might sound crazy and risky to some but to me the work involved is easy and the cost is small. It might be a bit laggy? I guess we'll see. It will end up on the dyno after I have done most of the tuning so we'll see then. That's a couple of months off tho, busy with work and home and engine building as most of us are. At the end of the day if it all turns to shit all I would have lost is a small amount of money and a weekend or 2. Have faith peoples. I'm not some chinese whispering 20 year old.

[Room42]

As far as the original question goes I was kind of thinking about 10 psi. The afm is at almost 4.4v now with 14 psi on (obviously) one stock turbo.

[Rolls]

It will be laggy and the turbos will only run 12psi.

Why not go a gt3076 or bigger? simple and proven and possibly cheaper.

[Room42]

It will be laggy and the turbos will only run 12psi.

Why not go a gt3076 or bigger? simple and proven and possibly cheaper.

A bigger single would be the easy way out as far as install goes. I guess I'm doing it cos its cheap and fairly easy and a bit unique. Plus it would give me something to do that I'm interested in. I'm curious to see how it would go. If it turns out crap then a 6boost manifold and a gt3582r will end up on the 2530.

[_x_FiReStOrM_x_]

Max will be 500hp, it's the max theoretical resolution of 1x Z32 AFM

Best post in whole thread!

IIRC it was a pretty simple and direct question.

500hp seems to be about right. What sort of power are you chasing?

[Room42]

Best post in whole thread!

IIRC it was a pretty simple and direct question.

500hp seems to be about right. What sort of power are you chasing?

Whatever the engine/ turbo kit will do. I just pulled the head of the 30 and the bores are 86.05mm. I'm about to sus out the piston/bore tolerance and if its ok then its going to stay the way it is (stock). If it needs machining then forged pistons are going in. Even if it stays stock (or forged pistons) its getting a 3.4 stroker kit next year on the tenth of August (my birthday!). So the power level will vary depending on what work gets done to the engine for now. Either way it only has to last a year so I'll turn it up as much as reliably possible.

EDIT: I'm only running an intank walbro 341 for now so that may need replacing with something better as well.

Edited August 7, 2011 by Room42

[ARTZ]

I am aware of the risk involved with ceramic turbos but as they wouldn't be seeing a high boost level with 2 of them this wont be an issue. My current turbo has been seeing 14-16 psi at least twice a day if not 20 times a day for 6 months and it's fine. That argument aside, there are some good reasons that I am doing this turbo setup. The cost of doing this is bugger all. Another stock turbo with lines is $150. A head flange and 2 t3 flanges cost me $100 from ebay. I'm getting all the pipe for the manifold and exhaust from work for free. I currently have one hks split dump that I've been using for a while now. I need another split dump or I could use the stock ones. The exhaust and manifold fabrication will cost nothing more than my good company and some drinks at a mates house. The water and oil line setup is another negligible cost. Intake piping is what it is. Silicone bends aren't that cheap but we all know what they are worth. Tuning is up to me. I'm going to tune the turbo setup on the current rb25det in the car and then swap it afterwards to the bigger motor. So it all comes in at less than $500. It will be fine aye. It will be neat and wont blow up Also as far as effort goes its not a lot in my book. As the cost is so low that means less wages spent. To get a "proper" setup I would be looking at a minimum of $3500. That's more work in the end. It might sound crazy and risky to some but to me the work involved is easy and the cost is small. It might be a bit laggy? I guess we'll see. It will end up on the dyno after I have done most of the tuning so we'll see then. That's a couple of months off tho, busy with work and home and engine building as most of us are. At the end of the day if it all turns to shit all I would have lost is a small amount of money and a weekend or 2. Have faith peoples. I'm not some chinese whispering 20 year old.

chances of getting it done for 500 are slim.. i predict at least 1k and ALOT of stuffing around..

Now considering you can get a 3076 for around 1 to 1.5k second hand that will bolt straight up to a 2.5 with minimal fuss, it will be much easier to work on and diagnose should any problems arise and it would probably kill your crazy setup ..sure it is something different and original but so is the gay mardigra and we dont go there

cool thread though..

[ARTZ]

or better yet a brand new Kando t67 is 800$ I really dont think you done your homework have you