just curious...

I would assume turbo because it works with exhaust, but all my friends who have blowers (some mustang and couple fbodies) talk bout IATs above 200+

just curious....

 

What, are you trying to start a flame war?

Seriously, though, it depends on a bunch of things. Higher compressor efficiency means lower boost temps. Many centrifugals are in the 72 - 74% range, while turbos can range from 70 - 78%. At the same efficiency and boost, a turbo will probably be a tad warmer since the exhaust is in such close proximity to the compressor housing.

BTW, the IAT sensors aren't very accurate over 150 F. I've seen turbo 2.3's and Lightnings go as high as 300 deg F.

 

lol, no flame war, just curious

 

Like mike said, a lot of factors come into play. Many like to play off turbos as always having higher IATs than SCs due to the exhaust thing.... but the air going through the compressor housing goes through so fast it hardly has time to get heat soaked due to the housing temp. I'd venture to say that most (90%+) of the heat generated in turbo boost is due simply to compression (just like in SCs). One thing that does come into play though is the rpm the compressor wheel turns. SCs generally don't turn more than 50-60,000rpm, while turbos go well over 100k rpm. This is why you see a difference in blade design and pitch between the two. Compressors pulling from ambient air temperature and pressure that turn faster rpm (compressing smaller amounts of air at a faster rate) can suffer from lower efficiency. That's why engineers design those turbine blades on jets to move the most amount of air at the lowest possible rpm to maintain peak efficiency.