Hks 2510 Exhaust Housing Swap

[Chris32]

Want more power out of my RB20/2510 combo

Easy way out would be to swap a 2530 onto it, but I want to think outside the square

ATM its making 193rwkw at 1.5bar boost, it comes on real quick but looses top end

Dropping boost back to 1 bar sees 185rwkw, a tad later in the rev range

Torque is obviously allot less that what it is a 1.5 bar

Heres my thinking.

Going just by looking at the housing on my turbo, it appears smaller than a stock RB20 housing

Cubes has also commented on this, and we both reckon its pretty small.

Would it be possible to swap a RB20 or RB25 exhaust housing onto the 2510? Does anyone know how a 2510 exhaust housing would compare to a RB25 housing?

The only differance I can see on teh HKS table between the 2510 and the 2530 is the exhaust side of things, with the 2530 having a 7mm bigger exhaust exducer diameter

I just want to free up the last few thousand RPM, at the moment, changing gears at 6000rpm because you can feel the power drop isn't what I am after

I am willing to sacrifice some low/mid RPM response for more of a top end. Boost will be around 1.3bar, anymore dosen't seem sensible on a daily driven, 20,000km a year car

Idea's suggestions?

Attached is my last few dyno's, first one is initial setup, bleed valve set to 20psi

Second is tune at 1.5bar and run at stock boost

3rd is last dyno run at 1.5bar

AFR's are 11.5 -12.1, timing is around 16/17 degrees at full noise

My tuner suggests the turbo is at its limits, cams or cam gears etc will just make the motor more efficient and bring the turbo on earlier

I am yet to test other systems on the car, ie intercooler pressure drop, but the cooler is 600x300x60mm with 2.5" pipework all the way through. Exhaust is 3.5" dump, then 3.5" all the way to the back, no mufflers or cat etc.

Chris

Edited November 15, 2005 by Chris32

[Chris32]

Anyone have any input?

[paulr33]

have u considered chaging to an rb25 hiflow and selling the 2510 instead?

i would imagine the cost to swap exhaust housings and balance it again wont be cheap

[Chris32]

I can't see how swapping exhaust housings will mean it needs to be balanced

I don't really want to change the turbo, I want to see how swapping the exhaust housings will effect it.

A RB25 highflow, say a GCG 450hp or whatever they do would be good, but I want to try things slightly differantly, and I can't afford a new turbo at this point

I think with a bigger rear housing, it might be all I need

[benl1981]

You don't have to get it balanced after you swap housings - i..e you should have to remove the turbone wheels or anuthing.....I doubt it would bolt on though.

[paulr33]

oh ok i thought you had to get balanced again, my bad

[BHDave]

Probably the first thing you need to do is see what other housings are on the market that will fit it. As it's a pretty small turbo i would expect an rb20 or 25 stock housing (machined to suit) would be your lowest cost option (thats assuming it will bolt up to the back of the hks core).

I suspect the exhaust housings that will fit will be gt25 style though so you will be up for an adapter plate aswell

[Chris32]

Ok cool.

I will have to do some picture taking of the rear and see what bolt pattern etc it is and then see what would possibly fit

I reckon you are right in thinking that GT25 style exhaust housings will be what will fit, so if I have to make up a adapter, by the time I do that I may as well get a 2530

[benl1981]

You dont want it not fitting right and either contacting the turbine wheel or being too big around the wheel leading to escaped gases without the full effect spinning up the wheel. Thats if the wheels are different sizes

[discopotato03]

Guys the main difference between a 2510 and a 2530 is the turbine itself , the 2530 uses the more open bladed 76T NS111 turbine where the 2510 uses the more oem style turbine found in the response over flow type turbos . I'm not sure if its economically feasible to rebuild it as a 2530 unless you have the turbine and Skyline specific exhausting from one . Probably easier and cheaper to buy a 2nd hand 2530 and bolt it on .

Cheers A .