Stockish R33 max boost

[CMS Drifter]

How much boost can i run on my stockish R33.

I have a full 3" exhaust and dump.

I have had a boost controller on it before and it seems to hesitate at around .7-.8bar would this be fuel cut?

[skyzerr33]

safely u can run 10-12psi

12 may ping on hot days due to heat soak on the koola

14 and looking at a new turbo

but that said plenty of cars have 14 all day everyday for quite awhile with your setup.

[Steve]

As what skyzerr33 said:)

Safely, with stock cooler, 10psi, with fmic 12 psi. Fuel cut is usually about 12 psi, so around .8bar.

Some cars seem to do ok on 1bar, some die a horrible death - depends on the health of the turbo????

With the stock cooler there is a pretty large pressure drop above 6000rpm, and boost pressure is measured at the plenum - so thus the difference in safe boost.

[SeriesIIGTST]

When you guys refer to max boost, do you mean consistently running that pressure. I have a S2 R33 and usually try and keep it around 10psi. However, I have been known to wind it up a touch and on a cold night have surpassed my 12.5psi warning on my EBC and hit 13.3psi but only for a second. Is this going to ruin my turbo in the same way? Or is it only when sustaining that boost. I literally heard the EBC alarm go off and lifted my foot.

[Steve]

It does seem that some people get away with it for a while - others dont. You turn up the boost it MAY cause problems - keep it down and you should have a turbo that last a while - choices:)

If you have a stock cooler, I 'think' (cant remeber exactly - anyone confirm?) its like a 7+psi pressure drop above 6000rpm -so if you are boosting to 12psi, the turbo is actually pumping 19+ (if the figure above is correct).

The big problem is the ceramic exhaust wheel, which is fragile - the compressor wheel places more load on the turbine wheel as the boost increasesie the compressor wheel has to work harder, the turbine wheel has to turn the compressor wheel - there for the load on the turbine wheel is incresed. When the air is colder, the air is denser, so it may even be worse in theory. This is how it has been explained to me anyhows.

[rev210]

10psi does just fine with the standard turbo. Most people running mid to low 13's use 10psi with the stock turbo, why push it further all you do is create more heat than power and shorten it's life.

Steve,

Last time I tested boost before and after the stock intercooler there was a 2psi or less drop even at 12psi.

[Steve]

What sort of rpm?

I'm not sure exactly where I saw it, either a magazine, or internet site where they stated they tested the stock cooler and it had a huge drop above 6000.

2 psi is bugger all.

[Steve]

Just had a look at one place, but I think there are others....

http://www.horsepowerinabox.com/mall/ic24.asp

[Guest RedLineGTR]

the max i would go is 14psi for the turbo and thats if your gonna get another one soon...10-12 psi at max if you want it to last no more than that...only if you really need to and that at the risk of the compressor wheel comming off

[ken]

so, should I run 14psi, if I am going to high flow my turbo? Do they renew everything?