Rb26 + Twin Hks 2510's

[`nigno]

Have searched, and looked through EVERY page of the turbo results thread for rb26 and rb30 and cant find anyone that has used this configuration.

Found plenty of 2530's but no 2510's, wondering if anyone has had experience with this setup or knows of anyone who has. Interested to know how much power this setup would be capable of and also when it would start making boost and hit full boost.

Ive seen these turbo's used with great results on SR20's as a single setup, with insane response and a healthy power figure to boot. Wondering what 2 would be like on a slightly higher capacity engine with work. Basically looking to maintain a healthy power figure 450 - 500hp+ whilst increasing response, currently hitting full boost around 4000rpm.

Turbo Specs:

300PS Output

COMPRESSOR:

-Wheel- 63 Trim - 47.7 Inducer / 60.1 Major

-Housing- 60 Inlet / 50 Outlet - 0.60 A/R

TURBINE:

-Wheel- 62 Trim - 53.0 Major / 41.7 Exducer

-Housing- GT25 inlet / Internal GT25 oulet - 0.64 A/R

If someone with experience would like to hazard an educated guess based on the specs provided that would be lovely I just dont trust my judgement in estimating these figures. Plus im biased and think he should stick with a big single and just go to something with a newer design.

Might also help to know the engine is 500+hp on a big single at the moment (trust turbo of some description although its a bit old, pretty sure its plain bearing too) stage 3 hks cams 275 deg duration, plenty of head work (polished, port matched, aftermarket valves, retainers etc), built bottom end (pistons, rods, bearings etc) and all the goodies you would expect to find on a car of this nature. (btw posting on behalf of a friend)

Thanks in advance - James.

[SXR]

I have done one R33. I think there great turbos....its pretty similar to GTSS

So far on stock motor with metal head gasket and stock fuel system, we have hit the limit to 300kw @ 4wheels. I should have the dyno sheet, which will show the boost.

[discopotato03]

Firstly I'm not sure if you have those 2510's or by the "he" you are talking about someone else .

HKS's GT2510 have been around for ages and ideas on matching compressors to turbines has changed . A 2510 is basically a 2530 with the less pereformance biased version of the two available GT25/28 turbines . Its obvious they wanted a lower boost threshold out of them (compared to 2530) so opted for the slightly smaller turbine which from memory has more blades and less open blades than the other option .

If I was buying responsive turbos for an RB26 HKS's later GT-SS turbos do a better job IMO so do a search on those ones . There are also other turbos such as a few garrett variations along similar lines . I think WilliamsF1 here got really good results with them (GT-SS's) and bags of mid range torque from an RB26 .

My personal very biased opinion on that engine is single turbo if starting with a clean sheet , I thinks turbos have (and are still being) developed that give little away to twins but all the support systems have to be good . There probably comes a time for very extreme power outputs where its almost impossible to fit one turbo and close the lid but the vast majority of people will never do this .

I really hope the single/twin feud is not going to erupt again as everyone is welcome to their own opinion .

Cheers A .

[RPMGTR]

2510's are rather old skool. Similiar or slightly better in spoolup to 2530 but without the power. The turbine to compressor match reflects the age of these units. R34N1 or GT-SS will make more power with substantially better spool up and transient response. 2530/2560-5 will have similiar response but with much greater power due to higher flowing turbine.

cheers.

B.

[`nigno]

I have done one R33. I think there great turbos....its pretty similar to GTSS

So far on stock motor with metal head gasket and stock fuel system, we have hit the limit to 300kw @ 4wheels. I should have the dyno sheet, which will show the boost.

That dyno sheet would be greatly appreciated if you can hunt it down mate.

And thankyou to the others for your responses too, so basically a pair of 2530/GTSS's is going to offer similar if not better response with a higher ceiling for total power output?

I was under the impression the 2510's would spool a lot earlier than the 2530 due to the difference in design as noted in one of your replies. Even being the earlier design, if they are better responsively and will offer a peak power output around the target area, which based on the quoted power output in the above statement they certainly will, I would still really consider them as response is a BIG factor in the change... if its going to be negligible then my biased opinion is probably correct, stick with the big single.

Looking at dyno graphs in the RB26 turbo results thread of twin 2530's, some come on even later than the big single setup thats currently on the car which hits at 4000rpm as opposed to a lot of those graphs showing 4500rpm with a greater peak power output (around 380rwkw as it sits, note rear wheel not all wheel, this engine is in a gtst).

Further confirmation would be great and that dyno graph will certainly put my mind at ease if you can dig it up.

Cheers

James.

[R31Nismoid]

Dont confuse GT-SS and 2530's.

If you read RPMGTR's post its clear.

The GT-SS are smaller than the 2530's, and give better response than 2530s, less outright power.

There are a number of GT-SS graphs about these forums, and its such a meaty midrange.

You said 500hp, 370kw, thats around 300-330rwkw, and thats smack in the GT-SS/34-N1 range.

If you want more, then its the 2530/2560-5's for you

[`nigno]

Dont confuse GT-SS and 2530's.

If you read RPMGTR's post its clear.

The GT-SS are smaller than the 2530's, and give better response than 2530s, less outright power.

There are a number of GT-SS graphs about these forums, and its such a meaty midrange.

You said 500hp, 370kw, thats around 300-330rwkw, and thats smack in the GT-SS/34-N1 range.

If you want more, then its the 2530/2560-5's for you

Oh sorry I wasnt saying they were the same i was saying "either" of those setups. I'll go hunting for some GT-SS graphs now, still wouldnt mind grabbing the 2510 graph though, just for interests and comparisons sake.

[R31Nismoid]

Ah i get ya.

Umm... who has the GT-SS's... there was a thread in NSW General section, and a couple in this one for them.

Cant beat em (so im told, and hopefully try for myself in a month or two)

[SLY33]

Dude what do you want to do with this car?

I went in a 32gts with a light tuned rb26 stock turbo's only about 250rwkw, and the car was a beast on the street. You have 380rwkw now, how do you drive that seriously!? Im presuming you track it, or are just a nut to have that much power in a little RWD 32 gts!!

oh ive also heard that for GTR the GT-SS's are a really awesome choice. But 4WD is pretty different to RWD! On a track with some track tyres it'd be a blast.. on the street, you'd think it would smoke the bags all through 3rd!

Edited September 28, 2006 by SLY33

[`nigno]

Dude what do you want to do with this car?

I went in a 32gts with a light tuned rb26 stock turbo's only about 250rwkw, and the car was a beast on the street. You have 380rwkw now, how do you drive that seriously!? Im presuming you track it, or are just a nut to have that much power in a little RWD 32 gts!!

oh ive also heard that for GTR the GT-SS's are a really awesome choice. But 4WD is pretty different to RWD! On a track with some track tyres it'd be a blast.. on the street, you'd think it would smoke the bags all through 3rd!

I currently run around the same power in my 32 GTST with a trust built rb25det and a big single... its not that bad, spinning through 4th isnt such a bad thing since we are both drifters just exploring opportunities to increase response without sacrificing peak power. Hell if all goes well on the RB26 I might even look at doing an RB25DETT for shits n giggles seeing as though everything else is just about done now.

Just gonna wait on these dyno graphs of the 2510's do a bit more research and comparison, make a decision and get it all under way.

[discopotato03]

Given a choise the GT-SS's will do a far better job than 2510's . There was a lot more in the way of GT25/28 bits for HKS to play with when they specced the SS's . Definitely more suited to RB26's characteristics and drive experience nicer in a short rod shortish stroke engine thats designed to breath and rev . As I said talk to WilliamsF1 . Great long string and fantastic result .

Cheers A .

[SLVR32GTR]

Given a choise the GT-SS's will do a far better job than 2510's . There was a lot more in the way of GT25/28 bits for HKS to play with when they specced the SS's . Definitely more suited to RB26's characteristics and drive experience nicer in a short rod shortish stroke engine thats designed to breath and rev . As I said talk to WilliamsF1 . Great long string and fantastic result .

Cheers A .

I have a set of the GT-SS's on my GTR. They are absolutely awesome!! The power is almost instant, and when it comes on, its bloody scary, hehe. They actually come on at about the same as the stocko's if not quicker due to the ball bearing ( more likely to do with my manifolds which i port matched and flowed, and the split dumps) cores and newer more efficient design.

On a crap tune they are putting out 270kw at all four on 21psi of boost, but after matty spry retunes it on tuesday, it should be more like 310kw at the wheels. As it is now though, on a damp on ramp to the M1 the other night, it managed to have all 4 spinning in 3rd which was scary as hell, hahah. It did track very straight though thanks to the 4wd.