Chipped Turbo Wheel

[Kwyjibo]

Hi,

I have just put on a HKS 2530 on my car. The standard turbos front wheel was chipped really badly. The new turbo was in great condition, I have run it for only about 5km and for about 20 minutes on idle and now there are small chips on the turbo fins, and one fairly large one on the outside of one fin. I'm assuming my filter is dodgy but can anyone think of what else could cause this? Turbo had absolutely no shaft play and boosted fine when I drove it.

Anyone know what the next step is? I understand that there is going to be an enormous imbalance in the wheel now so I assume its going to have to be fixed. Can the front fins be replaced with a replacement unit somehow or can it just be rebalanced?

[Kwyjibo]

Sorry one more question regarding this? If I was to get it fixed can just the front wheel itself be replaced? It seems to just be held on to the cartridge by a nut from what I can see and I imagine that will be a lot cheaper than replacing the whole cartridge.

[Guilt-Toy]

you need to check your pipework going into the front of the turbo, make sure there are no rocks or dirt or anything in there at all! make sure your filter is working correctly, look at it carefully!

Yes you can replace the front wheel of the turbine without any issues, or you can get the turbo re-balanced as well or just leave it and continue to use it, i have seen many functional turbo's with chips in both the rear wheel and front wheel.

take the turbo off and send it to GCG to inspect it and see what the suggest

[hypergear]

If you are missing weight on a specific point then it obviously cause vibration at high RPMs depends on how much weight is missing and what RPM your turbo goes up to. If you like PM us with the comp wheel size we might be able to help you out, Re-balance the rotation assembly once assembled. And it should be good as new.

[Kwyjibo]

I've sent you a PM regarding this for a quote. I am in Canberra though so would have to send the turbo to you(although I will be in Melb for a few days late June).

Any idea what is accetable shaft play for these turbos. There is still absolutely zero left to right. I can get extremly slight movement pushing back but only less than a mm and I have to push very hard(which is why I didn't notice any in the first place).

I've had a bit of a better look and the chipping looks pretty much the same from outside to inside of the fins, except one fin has a reasonabe chunk out of it on the outside. Still thinking I got dirt or something in the system though as my old turbo is pretty bad and the fins were perfect about 5km ago(when I first put it in my car) it was in a car previous to this as well so if there were issues I would have thought it would have happened before..

Edited June 6, 2009 by Kwyjibo

[Guilt-Toy]

I've sent you a PM regarding this for a quote. I am in Canberra though so would have to send the turbo to you(although I will be in Melb for a few days late June).

Any idea what is accetable shaft play for these turbos. There is still absolutely zero left to right. I can get extremly slight movement pushing back but only less than a mm and I have to push very hard(which is why I didn't notice any in the first place).

I've had a bit of a better look and the chipping looks pretty much the same from outside to inside of the fins, except one fin has a reasonabe chunk out of it on the outside. Still thinking I got dirt or something in the system though as my old turbo is pretty bad and the fins were perfect about 5km ago(when I first put it in my car) it was in a car previous to this as well so if there were issues I would have thought it would have happened before..

wow there you go, you have had a offer from Hypergear to look at the turbo for you!

Send it to them and report back with the results, they will look after you

[Kwyjibo]

Thats the plan, going to get it checked in Canberra, if it needs anything more than a balancing will send it to Hypergear. Found out the 2860r wheel is .5mm smaller at inducer and .1mm smaller at exd so hopefully thats a close enough match if I decide to get a new turbine(will discuss with Hypergear)

[Guilt-Toy]

Thats the plan, going to get it checked in Canberra, if it needs anything more than a balancing will send it to Hypergear. Found out the 2860r wheel is .5mm smaller at inducer and .1mm smaller at exd so hopefully thats a close enough match if I decide to get a new turbine(will discuss with Hypergear)

If you have to get a new turbine wheel ask Hypergear if they can fit a bigger wheel so you get a bit of a highflow happening for a cheap price and bag some extra KW while you are at it!

[Kwyjibo]

If you have to get a new turbine wheel ask Hypergear if they can fit a bigger wheel so you get a bit of a highflow happening for a cheap price and bag some extra KW while you are at it!

Thanks thats a good idea, just don't want it to affect response too negatively. Its on an RB20 and was really only aiming for 220kW. Already felt slightly laggy with the standard 2530 on my quick test drive(untuned though) and don't want it much worse.

[hypergear]

Not with broken fins any more. I took some photos before I sent it back.

and some information of what we did for you turbocharger repairs.

This is repairing a HKS2530 Turbocharger with broken Comp wheel.

This is a 60mm 63 trimmed comp wheel.

It has been replaced with a new 60mm 64 Trim comp wheel. We had the CHRA and housings cleaned with all internals assessed. Luckily this turbo only require a new comp wheel. So looks like this once all put together:

The comp housing had lots of chips on inner frame, This has all been re-profiled out.

Finished product:

[Kwyjibo]

Thanks a lot for this! Got great service from Hypergear.