Experience installing CHRA turbo cores from CR Performance

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BradM

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Just documenting a few things that might help others. The install was on a 2017 Police Interceptor sedan.

1) The OEM-spec CHRA's from CR Performance are made in the UK by Melett and they claim to use their own parts. They come with the needed o-ring for the turbine housing. Avoiding Chinese junk is possible...a big issue for me.
2) If you purchase CR's upgraded turbines, they simply replace and rebalance the turbine that came from Melett. CR does this at their facility in Canada. I could not find any performance data so I opted for OEM-style.
3) CR does not collect US sales tax. I have no idea if/how taxes would be collected.
4) I purchased the gasket kit from CR and while it worked, it was not the best. The crush washers had about 50% less sealing surface over the OEM ones and they were not coupled together like the OEM ones. It was a huge challenge to install them on the cooling lines on the rear turbo. I would definitely look for an OEM kit next time.
5) You can easily remove the rear turbo without removing the axle shaft. I removed the two bolts holding the steering rack allowing it to move back about 2 inches. Rotate the turbo vertically so the downpipe surface is facing down towards the opening. The biggest issue is making sure the cooling lines are pushed back well away from the turbo to avoid entanglement.
6) Remove the rear engine lift bracket to make life easier. Leave it off for weight reduction :)
7) If you have trouble using the quick release tool on the rear turbo oil line, just unscrew the entire quick release housing from the head. Then remove the line on the bench and reinstall the housing to the head. I used Loctite 592 sealer.
8) Do not buy new oil lines to replace the oil screens. The oil screen is inside the hole where the banjo bolts goes (on the turbo). They are brass and slide out in one direction only. Blast them with brake clean and reinstall. Both of mine had some blockage so don't skip this step.
9) Our turbos have clocking pins on each housing so don't worry about getting the clocking right.
10) There are left and right versions of the CHRA's.
11) If your old turbos were spraying oil throughout your charge pipes and intercooler, clean them. An oily surface does not transfer heat as well as a clean surface.
12) Have a beer to celebrate no leaks.
 

BradM

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I knew I'd forget something.

13) Do the front turbo first so you can learn on the easier one.
14) You will loose about 2 quarts of coolant. I did not drain any coolant ahead of time.
15) No oil was lost.
 

Ta2dResqr

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Are you up and running? How do they feel? I am debating about running their upgraded cores.
 

BradM

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No measurable difference using Dragy but I'm using OEM-spec. My seals were bad (9000+ idle hours). I could not find any performance data on their upgraded turbos, just specs. Most folks say they found no difference. Not enough for me to go with the upgrade.
 

Ta2dResqr

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?? This thread is talking about cores, not turbos.
Yes. You started a conversation about cores. I asked about how they seemed after install. @76FoMoCo was stating the GH are the better option for performance. CR Performance CHRA Cores are $700 or $890 (I misspoke and said $6-800). GH only sells complete turbos for $3200. I was stating that the lack of a need is why I am having trouble justifying $3200 turbos over $890 cores.
 

BradM

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Got it. CR also sells upgraded turbos, 38mm and 40mm. Those can be compared to GH. There is no performance improvement to be had just upgrading the cores IMHO. The OEM housings limit the performance.
 

BradM

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I now have some before and after data. I did see an improvement but I think it's because the old cores were worn out and leaking, and maybe the ambient temp helped too. Shaft play was noticeable on the old ones but not crazy bad. But the new ones do seem to spin better. I also have less turbo whistle, which I believe means the cores are not dragging as much as they used too. All times were at the same drag strip one week apart.

Old cores: 12.414 @111.35 (ambient temp 53 degrees) 93 tune
New cores: 12.337 @111.05 (ambient temp 38 degrees) 93 tune
 

BradM

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Yes, it could be DA. But I've made about 30 hits this spring and they all landed between 12.45-12.55. The 12.41 was my PB. I've never been in the 3's and both hits yesterday were in the 3's with one deep into the 3's. I'm giving some credit to the new cores. And yes, I'm happy. Waiting for my XDI so I can go E30. My goal is to get into the 11's.
 

BradM

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Not So Good Update

600 miles since the install and my intake plumbing is dripping with oil. When I installed the new cores I did notice that there was shaft play (side to side, not end play). Could I have faulty cores? I did the following to try to eliminate the cores. Any other ideas would be appreciated.

PCV system:
It's working. I checked the valve and the Bank 2 line. All lines flow as they should. I have a catch can but it only operates when there is no boost (PCV valve open) and it barely had any oil in it.

Blow by:
When I checked the Bank 2 PCV line, it was moist but I would have expected much more evidence of blow by to account for the amount of oil I'm seeing. With the PCV system in place, I measured crank case pressure under 15psi boost and it measured 2.5psi. I then placed my catch can on the Bank 2 side and it did not collect any oil.

Oil drain lines:
If these were blocked, it would produce back pressure and push oil out of the seals. I haven't figured out how to test them. My oil feed screens did show some debris so they did their job. I'm not sure how the drains could get clogged.

All signs point to the core seals but this seems like crazy bad luck.
 

Ta2dResqr

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I can't even get them to respond to an email or phone call. At this point I am about ready to cross them off my options list.
 

Shoplus80

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I am currently in the process of replacing my cores with the CR cores, in your write up you had nothing regarding the torq spec's for the housing bolts, did you happen to have those specs?
 

BradM

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I don't have the specs. Like most installs, just use common sense and be consistent. By the way, both of my cores from CR were leaking and I sent them back. I'm giving them a chance to resolve this and then I'll post my experience.
 

Shoplus80

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I don't have the specs. Like most installs, just use common sense and be consistent. By the way, both of my cores from CR were leaking and I sent them back. I'm giving them a chance to resolve this and then I'll post my experience.
Oh man how long had you been running them before they started to leak?
 
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