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  #1  
Old 07-10-2015, 11:52 AM
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Making a hybrid stock turbo

Hi all,

Just wondering if anyone had tried to make a hybrid turbo using the stock KKK k14 turbo at all. The turbo is also on the Peugeot 306 it seems and I believe it can be made a hybrid using K03 parts.

I only ask as due to the very specific flange Mercedes have used there aren't really any upgraded turbos you can just bolt on, you would have to bolt on an adapter (like the one dieselpumpuk sells) to retain the stock manifold but a T3/T4 fitting or go for a custom manifold.

Owing to being in the UK with RHD there is a steering rack in the way meaning that a lot of off the shelf OM606 manifolds won't properly clear everything and cause issues with the downpipe.

I am thinking about looking to retain the smaller hot side (for quick spool) but upgrade the compressor side to give some additional air. I won't be upping the rev limiter so it would shift up as normal - I can tell that from around 3.5k rpm the engine is using more air than the turbo can provide as I can see a drop in boost pressure.

Has anyone on here tried it at all - I might look at getting a spare used stock turbo and then use that to rebuild it with a larger compressor housing.
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Old 07-12-2015, 03:53 PM
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I have got a Garrett turbo from a 4.2 litre I6 J100 land cruiser which seems that it could work well. The stock land cruiser engine makes 201bhp and I have had a look at some of the specs of the stock turbo.

The compressor side is larger than the stock K14 turbo, but it seems that the hot side is around the same size. The plan is to remove the compressor backplate, compressor wheel and housing and attach it onto a stock K14 setup. It seems that they both have a 4 bolt backplate so it might work. I am planning to use the stock hotside and shaft and see if it works correctly with the cold side of the Garrett turbo.
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Old 07-13-2015, 06:12 AM
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'ictures 'lease!
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Old 07-13-2015, 08:07 AM
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Quote:
Originally Posted by Stretch View Post
'ictures 'lease!
I will be taking some photos soon, I have started to take the donor turbo apart, its in very good condition so should be suitible to use. The main things I need to check are:

Compressor backplate mounting - I believe they are both 4 bolt
Turbine shaft size, I believe the larger turbo is slightly larger by 1-2mm

I have a used E300 stock turbo on its way, at the very least I will be cleaning up, checking and then porting what I can.
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Old 07-13-2015, 02:15 PM
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I sorta did that - well, actually Tim's Turbos in Virginia did it for me on my OM617 turbo. My turbine side is OEM with a T03 (I think) compressor side with clipped wheels. I can get up to near 20 PSI with an acceptable pressure ratio. As you may be aware, you don't want the exhaust manifold pressure to be more than 1.5 times the intake manifold pressure. If the pressure ratio gets "up there" you'll have to upsize the turbine side.

Dan
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Old 07-13-2015, 03:09 PM
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Quote:
Originally Posted by Dan Stokes View Post
I sorta did that - well, actually Tim's Turbos in Virginia did it for me on my OM617 turbo. My turbine side is OEM with a T03 (I think) compressor side with clipped wheels. I can get up to near 20 PSI with an acceptable pressure ratio. As you may be aware, you don't want the exhaust manifold pressure to be more than 1.5 times the intake manifold pressure. If the pressure ratio gets "up there" you'll have to upsize the turbine side.

Dan
I will measure the turbine wheel on this turbo, its actually quite small and seems about the same size as the OEM one so I might be lucky and find that its correctly matched.
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Old 07-19-2015, 09:54 AM
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The stock turbo for rebuild has now arrived, I have removed the compressor wheel and backplate from the other larger turbo already. I have found that the compressor wheel on the stock KKK K14 turbo is stuck, I noticed that there has been a fair amount of sticky oil in the compressor housing. I think it would be oil that would have been vented into the inlet via the rocker cover. I am thinking that this has then got hot and set - I have ordered a basic gear/bearing puller to simply remove the turbine shaft from the turbo which will then release the compressor wheel.

Looking at the 2 compressor wheels I believe that the are the same diameter however the land cruiser compressor is slightly taller and the compressor cover is taller and slightly wider than the stock KKK K14 turbo.

The compressor nut is also the same on both turbos which might mean that both turbine shafts are the same common size. I will be pulling apart the stock turbo to check the bearings and seals anyway and will need to check the balance of the assembly.

This might mean that as the compressor wheel is slightly larger (but not massive) and the turbine wheels seem to be around the same size that bolting on the land cruiser compressor wheel will mean that the spool will remain quick but will supply slightly more air at the top end which is what is currently missing from the stock turbo.

I am also going to look at cleaning up and slightly porting the stock exhaust side to make sure that it flows as best it can.
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