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Max Boost For Std Cooler R32.

MM2death

By MM2death,
in Engines & Forced Induction

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RS500 Experienced

RS500

Posted
Posted

the stock R32 GTS-T intercooler is not the most efficient intercooler due to its design, size and position, but it'll do the job with the factory turbo pushing 10-12psi, although ideally you'll be doing the engine and turbo a favour by upgrading to a decent front mounted unit.

if you are looking at eventually modifying your car for more performance, i'd recommend you upgrade your intercooler so that should give you an idea of how good they are.

cheers.

Guest INASNT

Guest INASNT

Posted
Posted
Originally posted by broken

hey, i run about 14psi through my stock turbo and cooler and it runs fine.

it has been on the dyno and it doesn't lean out or detonate.  

btw my car hit 27 psi on the dyno by mistake (for about 2 secs) and the turbo is still holding together 6 months later.

do u realise that if u run 12psi instead of 14psi through the stock cooler u would have more power?

REDGTT Grand Master

REDGTT

Posted
Posted

When I had a R32 GTst I ran 14.7 psi all day long no probs. Was on dyno too and the mixtures were fine.

Wouldnt go any higher though. Its not the engine thats not capable. Its the Turbos that shit itself.

To answer your question 12 psi is perfectly safe . Dont worry :D

Sydneykid Grand Master

Sydneykid

Posted
Posted

Hi guys, there are two problems with the standard turbo, both centred around the ceramic exhaust turbine.

Firstly, being ceramic the turbine is sweated/bonded onto the common shaft and therefore it does not like too much resistance ie; the exhaust is pushing the turbine while the compressor is trying to move air into the engine. Too much resistance (boost) and the turbine and the shaft part company. This seems to be the only one people talk about, but.............

The second problem is one of heat, the ceramic turbine will only handle a certain amount of heat coupled with this resistance. The heat builds up over several minutes of very hard driving (say on a circuit) and the turbine shatters or parts company with the shaft. Leaning out the engine to achieve more horsepower also increases the temperature of the exhaust.

So to answer your question, our experience has been that 0.8 bar (12 lbs) is OK for a road car as long as it is only in short bursts so that the heat does not build up. If you do any circuit work or long distance high speed stuff, then 0.7 bar (10 lbs) may well be the safe max.

The boost readings above are at the engine inlet. The boost at the turbo will of course be higher than that depending on the airflow of the intercooler and the pipework. By reducing this restriction (better intercooler) you can have slightly more than 0.8bar at the engine but still have the same resistance (boost) at the turbo.

With a really good intercooler and pipes we have achieved 0.8 bar (12 lbs) on a 200 RWKW road car reliably. But 5 hard laps on the circuit and the smoke escaped.

Sorry that this is a complex answer to the question but it is a complex scenario.

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