identify this turbo

[180athid]

hey guys i got this turbo from japan was told it was a gt2540R has same specs trim ar and zorst housing .86 but no badge showing you the pics if any help will be apreciated as it also came with a hks aculator and it had stud blots and is also a t25 flange thanks guys

[RS500]

what does it say on the id-plate (on centre core)

[180athid]

dose not have a id plate as stated as the badge

[RS500]

fair enough.

given the pics, it seems that it could be a HKS GT2540R as they were the only turbo in the HKS GT25xx series which cam with the A/R .50 compressor housing and the A/R .86 exhaust housing.

what flange does it have, GT25 or T3?

[180athid]

gt25 mate

well as the other thread stated should it have a hks in the zorst housing i haven't seen it as some do some don't very confusing

[discopotato03]

Unfortunatly the middle pic hides the core so cannot tell if its a ball bearing type . One easy way to tell is to count the bolts on the core side of the exhaust housing . Four bolts means bush bearing and six bolts means ball bearing . That turbos compressor cover is a TO4E .50AR . I forgot to see if there is a divider web between the turbine outlet and wastegate outlet . If it has this and the four bolt exhaust housing its a Garrett Hybrid . I have seen something similar to this but with a .60AR B cover from Garrett . For positive ID really need to remove the compressor cover and measure major and minor diameters . This will tell the whole story . I have not seen HKS use that .86AR exhaust housing and turbine combination on their 25 or 28 series BB turbos .

Chow DPO3 .

[Cubes]

The exhaust wheel looks a lot less restrictive than the 2540 I've seen.

Apart from that the exhaust housing is the same size as the one I saw.

[180athid]

yeah it dose have 6 bolts ad also the oil feed has a restrictor in it

oh the hks website it say this turbo comes out in the .62 and .86 and there is 10ps diffrence between them .....any more info ?

[180athid]

anyone else any info would help

[yogi000]

looks like a turbo for a gtr or silvia from the exhaust inlet (t25 flange) but i dunno much

[discopotato03]

Fair enough so BB core with NS111 turbine . Still need to see comp wheel , unscrew the six bolts on the backplate adapter and carefully slide it off . If the major diameter is 76mm (3") its probably a 46 trim TO4E wheel making the turbo a HKS GT2540 . The only one of these I've seen was GTR specific and used a .64AR turbine housing and I think a T3 style compressor cover . It makes sense to use the larger housings for a single turbo application but most agree the 2540 is not a good pairing of compressor and turbine wheels . My own opinion is that turbine is best paired with the 60mm compressors ie GT2530 / GT28RS and whatever the GTR Skyline upgrade turbo is called .

Any how whip off the front cover and all will be revealed , Cheers A .

[180athid]

is this the 6 bolts that atach the core to the zorst housing ?

or the front one ?

[discopotato03]

The front one (aluminium) .

[180athid]

ok i will take it off now

[180athid]

ok i measured the front wheel it is 76mm

[discopotato03]

Ok now measure the smaller or front diameter across the tips , some pics of the front and side of the wheel would be handy too . The 2540's wheel was either 40 or 46 trim , I'll have a look at the HKS site to be sure .

[discopotato03]

From HKS there are three versions of the 2540 all using the same core and wheels . The first has a T3 flanged .64AR exhaust housing probably aimed at RB20/25 for R32/33/34 . The other two have the 2540R designation and the difference is .64 or .86 AR T25/28 flanged exhaust housings . The two "R" versions are probably aimed at the Rb26 and SR20 engines .

Now the compressor wheel is 46 trim and should measure 51.7mm across the tips .

Your turbo may be that third version .

[180athid]

yeah thats right mate 51mm abouts i will get some picks up tonight so you can confirm

[180athid]

nah the gt2540 came out in gt25 flange also but it has a diffrent comp cover (marked hks)

but the gt2540r come out with a garret comp cover but didn;t come out for the rb20's or 25's in a t3 flange

thanks my knowlage

[180athid]

here are the pics not that clear but you get a idea