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identify this turbo

180athid

By 180athid,
in Engines & Forced Induction

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RS500 Experienced

RS500

Posted
Posted

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?

discopotato03 Grand Master

discopotato03

Posted
Posted

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 .

discopotato03 Grand Master

discopotato03

Posted
Posted

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 .

discopotato03 Grand Master

discopotato03

Posted
Posted

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 .

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