Silvia Club of NSW

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 Post subject: TURBO ID
PostPosted: Sat Jul 02, 2011 6:01 pm 
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T51
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Joined: Sun Sep 11, 2005 7:56 pm
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Location: In the drivers seat
Car: 92 S13 SILVIA
To make a long story short , i have a red top sr20det never been boosted
no mods done to it . I have always been under the impression it had stock T25 fitted , i took car to mechanic and for service , went to collect today and he asked what turbo i had ? i said its just the stock t25 he told me it wasnt stock that it was difinately a ball bearing turbo (he said he could tell by the sound of it spooling up and the amount of power the engine had) i asked couldnt he tell by looking at it he said no the turbo is in a heat shield and could not see it . he said that some one has swapped the turbo for a ball bearing one and placed the heat shield back on to make it look stock.
on my way home i stopped in at another mechanic and asked him about it he took car for drive and came back and said the same thing its not stock turbo.
My question is first can you tell if its a ball bearing turbo by the sound ? (its quite loud and you can hear it spooling up very clearly)
second can you indentify the type of turbo by not removing the heat shield ? is this common for turbos to be upgraded and heat shield put back on ? also any suggestiosn of what type of turbo it may possibly be ?
Thanks for your help .

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 Post subject: Re: TURBO ID
PostPosted: Sun Jul 03, 2011 9:36 am 
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* first can you tell if its a ball bearing turbo by the sound ? (its quite loud and you can hear it spooling up very clearly)

No. It mat spool up faster than a plain bearing version of the same turbo,but you won't hear the difference coming on boost. Where you can occasionally hear it is when you switch the car off,and the ball bearing types keep spinning for a bit as they slow down.

* second can you indentify the type of turbo by not removing the heat shield ?

No. You need to be able to read the cart numbers from off of the bearing housing.

*is this common for turbos to be upgraded and heat shield put back on ?

Yes,if it's the same frame size as the original. Better under-bonnet heat control with it on,and less hassles from the police.

*also any suggestiosn of what type of turbo it may possibly be ?

Not from here,no. If it's stronger than standard it's possible that it's an S14 or S15's standard turbo. They used to be a common swap for the T25G that the redtops came with from the factory when people killed them and wanted a cheap upgrade.


Justin...

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 Post subject: Re: TURBO ID
PostPosted: Sun Jul 03, 2011 10:07 am 
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T51
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Joined: Sun Sep 11, 2005 7:56 pm
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Location: In the drivers seat
Car: 92 S13 SILVIA
fergo308 wrote:
* first can you tell if its a ball bearing turbo by the sound ? (its quite loud and you can hear it spooling up very clearly)

No. It mat spool up faster than a plain bearing version of the same turbo,but you won't hear the difference coming on boost. Where you can occasionally hear it is when you switch the car off,and the ball bearing types keep spinning for a bit as they slow down.

* second can you indentify the type of turbo by not removing the heat shield ?

No. You need to be able to read the cart numbers from off of the bearing housing.

*is this common for turbos to be upgraded and heat shield put back on ?

Yes,if it's the same frame size as the original. Better under-bonnet heat control with it on,and less hassles from the police.

*also any suggestiosn of what type of turbo it may possibly be ?

Not from here,no. If it's stronger than standard it's possible that it's an S14 or S15's standard turbo. They used to be a common swap for the T25G that the redtops came with from the factory when people killed them and wanted a cheap upgrade.


Justin...


Thanks for the information , you mentioned that when you turn the car off
you could possibly still hear it spinning as it slows down , which is what i get , so i guess i can assume its possibly a turbo off a s14 or s15 .
Thanks again for your feedback .

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PostPosted: Sun Jul 03, 2011 4:14 pm 
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Car: WGNC34,S14,AE86
It'll be S15 if it's a factory nissan turbo. BB S14 turbos are a myth.

Could be a garrett replacement like a GT28 as well.

Although it's all guessing until you pull the covers off and have a look.


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PostPosted: Sun Jul 03, 2011 7:21 pm 
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Joined: Fri Feb 01, 2002 11:00 am
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I have an S14 ball bearing turbo (from a Jap spec car)

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PostPosted: Mon Jul 04, 2011 12:30 am 
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T03
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DumHed wrote:
I have an S14 ball bearing turbo (from a Jap spec car)


out of interest thats a T28 bush bearing correct?

and for the thread post, im running a T28 ball bearing in mine right now when we pulled my T25 down i manage to get the T28 up and still retain the factory heat shield it sits out a llittle further then the T25 did but at first glance it pretty much looks stock =]

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PostPosted: Mon Jul 04, 2011 8:56 am 
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no, ball bearing as I said.

6 bolts between the core and turbine housing, and 466541 cart #

bush / plain / sleeve / wet floating / journal / hydrodynamic are names for the normal non BB type.

For the T28s that's usually a 466543 cart # from memory

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PostPosted: Mon Jul 04, 2011 6:38 pm 
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Car: WGNC34,S14,AE86
If you do a search on this you'll find a shitload of info. Cartridge numbers,compressor maps,external ID info,it'll all be on here.

Turbo info for S13 upgrading used to be a fairly hot topic on here back in the day.



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