Jump to content
SAU Community

Serious Turbo Knowledge Needed

Samuel Leonard
 Share

Recommended Posts

Samuel Leonard Rising Star

Samuel Leonard

Posted
Posted

i have pulled my r32 gtr turbos out.

i am trying to learn much more indepth about turbos.

i have measured my compressor inducer and my turbine exducer and worked out they are a t25 turbo with a 42mm compressor inducer and 41.7mm exducer on the turbine.

this means that my compressor should be a 54.4mm exducer and turbine should be a 53mm inducer. does that mean they are t2560r turbos? because that's what www.ztechz.net/id1.html suggests all the sizes are but i thought it should mean they'd be a t25 54.4R because the compressor exducer is 54.4? where have i gone wrong or do they just classify it a 2560? because there's no reference on the net to a t2554 or t2555? i'm trying so hard to get my head around it all.

any help from someone in the know would be great!

cheers, sam.

Link to comment
https://www.sau.com.au/forums/topic/379132-serious-turbo-knowledge-needed/
Share on other sites
Samuel Leonard Rising Star

Samuel Leonard

Posted
  • Author
Posted

Tag numbers on the center cartridge will tell you exactly what they are.

already looked. no tag??? they've been rebuilt with 360 degree thrust bearings and a steel exhaust wheel in 04.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Nope.

The Garrett link is a ball bearing unit, going by what you said - you have journal bearing items.

Sounds like your turbo's just have had steel wheels and a rebuild kit put through the original cartridge or similar rather than the ball bearing Garrett replacement.

Samuel Leonard Rising Star

Samuel Leonard

Posted
  • Author
Posted

Nope.

The Garrett link is a ball bearing unit, going by what you said - you have journal bearing items.

Sounds like your turbo's just have had steel wheels and a rebuild kit put through the original cartridge or similar rather than the ball bearing Garrett replacement.

is this bad? it cost the last owner $2600 i have receipts. i think that you might be right. so it's a copy of the t2554r's but it's not genuine items?

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

could have had the factory compressor housings machined and fitted to GT2554 cores. without an ID plate we're just guessing though.

Agreed!

Although if the invoice on it clearly states "journal bearing", then even without a ID plate we know they aint a ball bearing Garrett core.

is this bad? it cost the last owner $2600 i have receipts. i think that you might be right. so it's a copy of the t2554r's but it's not genuine items?

Do the housings look machined?

Back in 2004 that might have been a 'ok' price, I can't remember exactly when Garrett items of various series came out. I know you couldn't get a "-9" (same as HKS GT-SS) until around 05/06 if memory serves me correct for instance.

Either way now you can pick up such turbos for around $1200ea new. Journal bearing items, 2nd hand, maybe worth $800 for the pair.

Not saying they aren't genuine, just that they are not a ball bearing core.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Dose Pipe Sutututu
      NC MX5

      By Dose Pipe Sutututu · Posted

      The German place in Cabramatta was rock solid, fresh pretzel cooked to order back then. Then it went all quiet, after all the poker machines were removed, then I believe it closed for good. I did drive past the other week and noticed outdoor lighting a big screen, but no idea what is there now.  
    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • GTSBoy
      NC MX5

      By GTSBoy · Posted

      Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • GTSBoy
      R33 GTR running -9 with no tune

      By GTSBoy · Posted

      So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
×
×
  • Create New...