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 Post subject: Question - Stock boost on S5 13BT =?
PostPosted: Mon Aug 29, 2005 12:43 pm 
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Hi All

Sorry for the noob Q - just wondering what the stock boost on an S5 13BT is, and also what is a (very) safe maximum to run.

Erg

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PostPosted: Mon Aug 29, 2005 3:50 pm 
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Question answered via PM by one of the mods.

Erg

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 Post subject:
PostPosted: Mon Aug 29, 2005 5:53 pm 
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I think that stock boost is like 6-8 PSI

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PostPosted: Mon Aug 29, 2005 6:35 pm 
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i was told that they run 6psi until they have done 30,000k's and then it was sposed to change to 12psi but there was a problem with the computers so this did'nt happen to often. and you are probaly wright to run 14psi.

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 Post subject:
PostPosted: Mon Aug 29, 2005 6:59 pm 
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S5 RX-7 wrote:
i was told that they run 6psi until they have done 30,000k's and then it was sposed to change to 12psi but there was a problem with the computers so this did'nt happen to often. and you are probaly wright to run 14psi.


Wow, if thats true it would have been nice to be a mazda dealer and service the vehicle and watch the smile on the owners face. :D


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PostPosted: Mon Aug 29, 2005 7:27 pm 
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I wouldnt run anything over 10 - 12 psi at most. Your stock turbo will fail after that within a short period of time. They dont like having too much boost going through them.

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PostPosted: Tue Aug 30, 2005 11:36 am 
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Ol-Skool wrote:
I wouldnt run anything over 10 - 12 psi at most. Your stock turbo will fail after that within a short period of time. They dont like having too much boost going through them.


The main reason as I know from dyno'd stock motors is that inlet temps run to high with the standard top mount intercooler. I have been told that this is the only reason you can't put much boost through them.

On the other hand their would be an efficient point of boost for the stock turbo. So their would be no point trying to push it above what it works best at for flow. Maybe because the turbo itself cannot spin as fast as the air speed this could cause trouble with the impeller and/or bearings? Is this what you mean old-skool? I did not realise this could hurt the turbo, just that it would run less efficiently.

If the turbo is in need of a rebuild then I guess putting over 12psi could hurt the turbo but I would be more worried about the top mount IC letting intake temps run to high which eventuates in Knock and detonation.


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PostPosted: Tue Aug 30, 2005 2:28 pm 
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Hey hey my series 5 (dead stock) only showed 5psi on the boost guage.
After i removed the stock BOV it went to 7/8psi.
I think a few people boost to 10psi on stock but overall these old stock cars should be left around 8psi until u get a proper rebuild and an aftermarket ECU!

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 Post subject:
PostPosted: Wed Aug 31, 2005 1:44 pm 
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My Stock as a rock S5 runs .4 bar on the gauge in third.

You shouldn't run over 12PSI on stock turbo and stock cooler.
anything much over 12 the intercooler becomes insufficient and doesn't cool the air enough, therefor higher inlet temps and detonation. this is my understanding of the situation.

Also it is recomended that once you are running 14+PSI that you should have your motor dowlled as the motor will be twisting a heap.

correct me if I'm wrong.

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 Post subject:
PostPosted: Wed Aug 31, 2005 5:39 pm 
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basically 12 max. its to do with the heat the turbo makes and the stock intercooler.

if you have the right fuel mods you can easily hi flow your turbo to do 14psi, though your stock ecu is going to struggle.

I was running 14psi for 3 yrs on the stock hi flowed turbo making 260rwhp b4 my current setup, but I have a aftermarket comp, which I highly recommend.

don’t worry about doweling, it has nothing to do with boost so to speak. personally I think with proper tuning dowels are not needed. but each has their own theory

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