Engine Specific Info and Questions > IDI Engine

Ko3 boost / vs rpm

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Spokerider:
Guys,
 I have a Ko3 turbo on an aaz engine with aaz pump.
 I've just recently installed a manual boost controller, and have it adjusted for 16psi max boost. I also have a 1.6TD boost pin installed.

 My question is........at what engine rpm should maximum boost be reached?
 As is now, at 2500 rpm, boost is at 7 or 8 psi. I would like more boost at lower rpms if possible.
 
 This is a post from Libby diesel to another member when he was asking the exact same question;

libbydiesel
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Re: AAZ Boost / rpm.
« Reply #5 on: May 09, 2018, 09:04:09 pm »
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It should boost 15 psi by 1000 rpms or so.  7 psi @ 2500 rpms on a K03 means there is something wrong.
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 This is a pic of the Ko3 waste gate rod / linkage.
 Is it not adjusted properly?
 IF max boost with the Ko3 should be reached by 1000 rpm, what is wrong?
 

libbydiesel:
Have you looked at the compressor and turbine to make sure they are both in good condition?  How much play?  Can either wheel rub their housing?  Any intake or exhaust leaks? 

Spokerider:
Thank you Libby.
 I have inspected both turbines, and they look good, no signs of vane damage / rubbing, and very little play in them.... 1mm or less easily.

 This is the first time I've run this turbo.......I rebuilt the engine and the turbo came with it, so no past experience with it.

 Don't think I have any leaks. I didn't inspect the flapper valve and valve seat for effective sealing [ or not ] tho......this would mean pulling the downtube off for an inspection. I didn't know about this stuff, or anticipate having to troubleshoot the Ko3 when I buttoned her up.

Spokerider:
Here is a vid with a T3 on a 1.9.
 Can't tell for sure what rpms the boost comes on, but sounds like it's close to 2500 or more.

 https://www.youtube.com/watch?v=ucWlwQEa8a0

libbydiesel:
The T3 is huge compared to the K03 and boost threshold is much higher.  I live at 7000' of elevation (slower boost response) and put a K03 on a 1.6TD and would easily hit 14psi (the max boost I had set) by 1500.   

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