Question for those in the know- - -turbo dissection
01-20-2003, 05:36 PM
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Question for those in the know- - -turbo dissection
I gutted a few turbos for comparing, bored, and with access to some damaged parts. I've discovered a difference between the impellers on a 1.8T K03--and the impellers from S4 K04's. Simply put, the S4 impellers are fewer blades, and seem more extreme, as if they would move more air & support a higher CFM rating. So here's the question: Would putting an S4 impeller into a good K03 make a more productive turbo?
I do realize that a picture would do 1,000 words here....sorry.
I do realize that a picture would do 1,000 words here....sorry.
01-20-2003, 09:13 PM
#2
Re: Question for those in the know- - -turbo dissection
Does it clear the K03's cold side housing? Otherwise, use the K04 cold side I guess. It should be able to squish more air. But, would your ECU be able to handle it? I guess it would depend on how much more air it fed the engine...?
Usually, the higher the # on a 3K-W turbo after the frame size (Knm) means that it can move more air. IE, my standard K26 flows more than a standard K24, but less than the K27 Porsche used on the 930, which is a standard unit as well. How much the difference is, I dunno.
Usually, the higher the # on a 3K-W turbo after the frame size (Knm) means that it can move more air. IE, my standard K26 flows more than a standard K24, but less than the K27 Porsche used on the 930, which is a standard unit as well. How much the difference is, I dunno.
01-21-2003, 06:14 PM
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I hadn't actually tried to see if it would physically fit, just had the idea....
come to me. Wondering if anyone else had similar thoughts, or if anything had been done to test the idea. I'll be trying it with a blown k03 soon, but as far as getting it on an actual car...I'll have to find a guinea pig...any volounteers? Might be worth a turbo, email me if you're a DC/Baltimore local....
01-21-2003, 06:22 PM
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Ok because you said S4 K04's in your first post.
"gutted a few turbos for comparing, bored, and with access to some damaged parts. I've discovered a difference between the impellers on a 1.8T K03--and the impellers from S4 K04's."
01-22-2003, 08:36 PM
#7
Re: I hadn't actually tried to see if it would physically fit, just had the idea....
Since they are both K03's, it should work. You'd just be changing the trim to flow a higher CFM on the cold side, with the factory hot side. May work pretty well, just get a damaged S4 K03 (assuming the cold side wheel is ok), pull the good K03 apart (got a rebuild kit handy?), get the "small" K03 shaft+turbine (are they still one piece?) balanced with the "large" K03 compressor, mark it up, and rebuild your "small" K03 with a bit of a perk-up...Your ECU may even compensate for it? I guess it'd depend on what the limit is set to in the coding.
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01-23-2003, 02:36 PM
#10
Re: Sounds good!
Several hundred thousand rpm with a system out of balance won't be good. If you want to see a shattered compressor or turbine wheel, and other such things, go for it.
But...I would balance it as accurately as you can. Maybe rig up one of those test-rigs to balance model airplane and boat props and screws? Except modify it for use with the turbine shaft. Hmm...Wouldn't be too hard to make...
But...I would balance it as accurately as you can. Maybe rig up one of those test-rigs to balance model airplane and boat props and screws? Except modify it for use with the turbine shaft. Hmm...Wouldn't be too hard to make...