HKS 2540 Turbo

[JamieR]

Evening all,

Just wanted to find out if anyone here has experience or knowledge of the HKS 2540 turbo? I read many topics about the 2530, but hardly any on the 2540.

If so, are there any faults or issues to be aware of?

I know everything should be taken into account, so its application is a single setup on an RB25DET.

Thanks for any input...

J

[rockabilly]

hi jamie


the 25/40,s mate were the next size up from 25/30,s in there day rated at 350bhp each max i would personally go for a newer turbo for a rb25 something like a gt2835,depends on money and what power you want..bernie

[JamieR]

Cheers for that, Bernie.

The 2540 is already fitted to the RB in question. When you don't know too much about the history of an engine I think it's best to find out what you can

Are you aware if they were known for any weaknesses?

[rockabilly]

Are you aware if they were known for any weaknesses?


lag usually.lol

on the rb26 jamie they can be laggy as a pair but there again there is only 3 cylinders powering each one, so with six powering one it should be ok..lol

[JamieR]

Ha, I see what you mean. Just managed to find some archaic threads on the Internet suggesting that they are / were good for power, but this is largely produced at the top end of the rev range, compared to low down grunt.

At the end of the day, I would like what everyone else does... reliability

[Listerofsmeg]

i found them great as twins on an RB26, spool up later than 2530s of course, but they suited my driving style perfectly

[rockabilly]

HKS GT2835 TURBO *NEW*

[JamieR]

Originally Posted by Listerofsmeg

i found them great as twins on an RB26, spool up later than 2530s of course, but they suited my driving style perfectly

Aye, I had spotted a few of your threads / posts regarding them. I presume as a single setup, the spool time would be lower...? Did you ever have any problems?

Bernie, that looks like a fine piece of kit indeed and admittedly I'm going to end up being tempted to head down the turbo upgrade route. But the fact that this particular GTT already has the 2540 fitted would mean that an initial additional spend of £850 would be uncalled for... argh... surely!

[Listerofsmeg]

the spool is guess would be more or less instant as a single on a 2.5!

The main problem i had was the front one spitting its bearings out 2 months ago....ive replaced them with 2860R-10s very similar in size really. Theyre pretty robust if theyve been looked after, i bought mine 2nd hand and i believe they were used with anti lag by the previous owner, so they were never going to last too long at high boost on my car!! thankfully they didnt break up though

[JamieR]

Chuff me, that was lucky (if you know what I mean)! Escaped what could've been a rather expensive bill!
As you say though the anti-lag will have taken some blame for that.

I'm not sure what other engine work has been carried out on the car, but will be having a good rummage around the engine bay soon to see what's what

[Lith]

GT2540s are alright, they will make a reasonable amount of power but were always really laggy for the power they can make. They deliver similar power to the HKS GT-RS kits if I remember rightly, but with more lag.

[GT-R Glenn]

The RS's spool quicker and make more power than 2540's

[JamieR]

Morning chaps,

Thanks for the input on this, t'is appreciated. These 2540's certainly seem to be good, but with their weakness of spool-up time (depending on application). As they're already fitted to the RB25 then it seems that if I was to upgrade, the GT-2835 or GT-RS seem to be the general consensus...

[Listerofsmeg]

remember though chaps that Jamie is using the 2540 as a single...not a twin, it should spool up instantly!

[JamieR]

Not quite... but if I go ahead with the purchase then I will be We'll see how things pan out over the weekend... fingers crossed!