what makes one turbo blow hotter air than another? (not including IC)
07-28-2005, 07:43 AM
#1
AudiWorld Super User
Thread Starter
Join Date: Dec 2004
Posts: 3,589
Likes: 0
Received 0 Likes
on
0 Posts
what makes one turbo blow hotter air than another? (not including IC)
for example, above 20psi the k03 produces really hot air (thus requiring less timing when using that much boost to prevent predetonation). whereas a bigger turbo would be much cooler while flowing the same amount of air and you could increase timing.
why?
why?
07-28-2005, 07:48 AM
#2
The smaller the turbo is, and the harder you make it work, the more heat it produces...
at 20psi, the K03 is WAY beyond it's efficency range, whereas a gt28 is just getting spooled up..
07-28-2005, 07:58 AM
#3
AudiWorld Super User
Thread Starter
Join Date: Dec 2004
Posts: 3,589
Likes: 0
Received 0 Likes
on
0 Posts
so the heat is generated at the exhaust turbine, and that heat is transferred to the WHOLE turbo...
heating up the area where intake compressor is, thus pumping hot air. gotcha.
is there a way to prevent the heat transfer from the exhaust side to the intake side on the turbo?
they should make a two piece turbo in this case. an exhaust turbine in a housing with a shaft going to another side of the engine bay where a compressor housing would be located. much better design.
is there a way to prevent the heat transfer from the exhaust side to the intake side on the turbo?
they should make a two piece turbo in this case. an exhaust turbine in a housing with a shaft going to another side of the engine bay where a compressor housing would be located. much better design.
07-28-2005, 07:58 AM
#4
AudiWorld Super User
Join Date: Jul 2003
Posts: 9,878
Likes: 0
Received 0 Likes
on
0 Posts
the tiny impeller (turbine) has to spin ALOT faster to produce the same psi....
that tiny impeller spinning extremely fast produces friction with the air, causing it to heat up, basicaly the turbo is out of its efficency range.
07-28-2005, 08:02 AM
#5
AudiWorld Super User
Join Date: Jul 2003
Posts: 9,878
Likes: 0
Received 0 Likes
on
0 Posts
no...the exhaust side has little to do with the intake air heating up....
all the heat would have to transfer through the tiny shaft and housing, it does play a part but not much.
the heat is actualy generated by the cold side of the turbo spinning wayyy too fast to make the desired psi.
the heat is actualy generated by the cold side of the turbo spinning wayyy too fast to make the desired psi.
07-28-2005, 08:05 AM
#7
no, the heat is generated by compressing the air. the small turbo can't flow as much air, so it...
compresses the hell out of whatever air it can move.. And yes, the hot side does heat the whole thing, but that's not the primary source of heat, it's the compressing of the air that does it.
Trending Topics
07-28-2005, 08:08 AM
#8
more or less, but it's actually caused by the air molecules being jammed together..
remember, compressing air heats it.. the more you compress it, the more you heat it.. Because it can't flow much, the air just gets heated more..
