Data Plate Code ?

[TokyoTaxi]

Just wondering if there's any meaning to the code on the data plate of my turbo ?

I understand the GT2535-56T bit but does any of the other code have any meaning like a production date or something ?

Thanks.

[discopotato03]

Fat32 I believe the top row are batch numbers and the bottom number is the cartridge or CHRA (centre housing rotating assembly) part number .

My lists show that cartridge being in complete units numbered 725560-0005 (.64AR) , 472560-0006 (.86AR) , 472560-0013 (no AR shown) . The AR's being turbine housing AR .

The 2535's are unique in that the compressor wheel is supposed to be 69mm OD rather than 71.1mm for the GT35 series wheels . My lists show that compressor wheel as 69 x 51.6mm and 56 trim . I suspect HKS had Garrett Japan reprofile a 71.1mm wheel down to this spec in order to be less laggy than the 2871 series ie GT-RS . Actually the 2535 has been around longer than the GT-RS - from HKS anyway - and I'm surprised they don't turn up on RB26's where people want a bit more than 2530's do but less lag that 2871's/GT-RS's have . The HKS blurb shows 2535's doing 340PS so it fitted in between 2530's and 2540's which are supposed to be rated at 320 and 350 PS .

Any more pics ?

Cheers A .

[TokyoTaxi]

Excellent !! Thanks for all that info A. Yeh, they really are a great little turbo, even on an RB20

Here's the only other pics I took.

[TokyoTaxi]

And here's what it looks like after GCG finished with it

[discopotato03]

Was the compressor wheel changed as it looked a bit chipped in the before shot .

Cheers A .

[TokyoTaxi]

Was the compressor wheel changed as it looked a bit chipped in the before shot .

Cheers A .

No, there were 3 small nicks in the leading edge of the compressor wheel that were blended out. They look worse in the before pic than they really were and they blended out nicely

I'm amazed at the subtle differences after the overhaul ! The turbo boosts up quicker and is a lot quieter ( especially when it spools down after turning off the engine ). It makes sense but I just didn't expect any changes.

[discopotato03]

When all boiled down its just a HKS spec Garrett GT BB turbo based on the GT25BB centre section . If the bearing cartridge and housing seals were stuffed I'm not surprised if it was a bit gritty .

As I said it would have been interesting to see some pics of the compressor before the cover went on .

Cheers A .