KA-T under extended boost?

[kevdog240]

Will there be a problem if I need to go on long trips with my car and it is running 7psi of boost? It doesnt seem that good for the engine if I am doing 80-85mph (over 3000 rmps) for 10 hours of driving (cause i have to get it to and from my school). There was somewhere in Maximum Boost that said you shouldnt leave your car under full boost for more then so many seconds.... it wasnt that long though.

Just a random thought cause it sounds dangerous and would eat up a LOT of REALLY EXPENSIVE premium gas...

[Drift Machine]

Umm it won't be under full boost. You only see boost when accelerating. If you are cruising, there will be no boost.

[Def]

What about track driving where one might be on and off full boost for 20 minutes at a time?

Assume good water and oil cooling.

[ftrs13]

with my T3, I see boost when cruising at highway speeds.

Im actually curious and have the same question, yet its for 14 hours

SteveP.S.maximum boost says 15 seconds, I got a chance to read it again on the 20 hour greyhound ride home

[WDRacing]

Maximum Boost is OLD...Still a very good informative book, but outdated.

Firstly, your motor shouldn't be on boost while cruising. It will spool quickly at highway speeds and with the motor loaded in 5th gear. I would think if your turbo is putting out boost while cruising its far to small and very restrictive.

Secondly, if tuned correctly, the only thing the turbo will do is heat up your oil. The higher cylinder pressures shouldn't affect the motor or we would all be driving a perpetual time bomb. The length of time on boost would more adversly affect the turbo itself. Do to the extremely high shaft speeds and intense heat, having good oil and a oil cooler would be very beneficial. This is also another reason to run a water cooled oil lubricated catridge.

Brian

[ftrs13]

I was recently considering that, but its a z31 T3, and I thought that it was big enough to keep the KA happy, guess not.

what are my options, can I put a stage 3 turbine wheel into the turbo?or maybe would upgrading to T04 compressor help out.

the compressor upgrade was a future project, but maybe Id do it sooner if it would make my setup safer for long distances.

[C-Kwik]

What about track driving where one might be on and off full boost for 20 minutes at a time?

Assume good water and oil cooling.

The issue would actually be whether or not the cooling system is up to the task. This can depend on a great many things. If the cooling were sufficient, then you can boost all day long. But even factory turbo motors can have cooling issues on a road course.

[C-Kwik]

with my T3, I see boost when cruising at highway speeds.

Im actually curious and have the same question, yet its for 14 hours

SteveP.S.maximum boost says 15 seconds, I got a chance to read it again on the 20 hour greyhound ride home

But how much boost? Higher boost levels put a larger load on the cooling system. While it should not be boosting unless you are going uphill the whole time or towing something, if it did see positive pressure at cruising loads, then I would expect the levels to be low.

[C-Kwik]

what are my options, can I put a stage 3 turbine wheel into the turbo?or maybe would upgrading to T04 compressor help out.

Not without either changing the turbine housing with it, or having the existing turbine housing machined to accept the turbine wheel you use.

[ftrs13]

ok, the levels are low, 2psi approx but its reaking havok on my cruising right now. as soon as I get it fixed, I imagine the little amount wouldnt hurt anything, but with an even smaller T3, id have to imagine that there would be more.

[TrunkMonkey]

There was somewhere in Maximum Boost that said you shouldnt leave your car under full boost for more then so many seconds.... it wasnt that long though.

can someone please tell me where this is in maximum boost. i can't find it .

-demetrius

[C-Kwik]

Bottom of page 12. Corky is more or less just describing his experience, particulrly with non-factory turbocharged motors. But as he says, how fast do you think you'ld be going if you sustained boost for more than 20 seconds at a time? Unless I was on an oval, I would expect few tracks would allow me to boost for that long constantly. I might be too afraid to flog my car at that kind of speed anyways. I'm sure unless you spent some time and effort increasing high speed stability, it could get downright scary.