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Skyrel
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RB26 blow by problems
I have some blowby problems that I need to sort out, so instead of reinventing anything I was hoping for some input for mye setup. My car is a streetcar that gets abused regularly at trackdays, and has not had the most common oil control mods installed (restrictors, head return etc). Mods of interest are:
GTSS turbos 1.1bar HKS downpipe and exhaust Mines ECU 600cc injectors 385 wheel hp To help with blowby I installed: Mines head baffles Nismo oil separator Long story short, this did not help at all. My turbo intake is a complete mess after just half an hour ont the track, and if I go anywhere above 7500RPM or so I get clouds of smoke behind the car. At first I considered a second catch tank post oil separator. But I think it would be best to remove the Nismo oil seperator and install a catch tank with separate hoses from each cam cover, blocking off the PCV and see how that goes. But then I started searching and after reviewing a lot of posts that are talking of how the PCV system benefits the engine, I got insecure if this is smart for a streetcar.. Anyone with some educated answers out there?
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AlexJ
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What size restrictor have you got in the turbo oil feeds? ball bearing turbos need something to reduce the flow or they will blow oil past the seals.
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Skyrel
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As far as I know all garratt BB turbos come with a restrictor, but I have no idea of the size. Are you thinking I need to install a second restrictor in the banjo?
Thanks Edit: To test this, I could simply clean the intake and dump the valvecovers to ground for a while. Then inspect the inlet to verify if the problem is blowby or turbo seals.
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Last edited by Skyrel; 14th July 2017 at 10:18 AM.. |
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#4 (permalink) | |
AlexJ
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Quote:
Worth a try I think, because otherwise you have bigger problems. My setup is very similar to yours, with the addition of a restrictor in the head oil feed and blocked off PCV, I run 15w50 oil and overfill massively. I've never filled the catch can after thousands of track miles.
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AlexJ
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sounds like a good plan
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Skyrel
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Quote:
I cannot remember if my banjos had restrictors. I also got the turbos second hand, so there is a possibility I used the OEM banjos. With that said, the turbos probably has restrictors in them (I think all Garrett BB do) and the banjos could be secondary restrictors. I dont have very high oil pressure, I have an OEM pump with just over 4 bar on the OEM gauge. I have thinner oil than you do though, 5-40, but I run a very good oil cooler and of course overfill it like mad ![]() Ill try the ventilation thing. If theres still oil in there, ill need to do the painful job of inspecting my banjos for restrictors ![]() ![]() ![]() PS Im considering to remove the PCV system as well, and ventilate the cam covers in a seperate tank. But then I read that the PCV system should be kept in plase in street cars.. Any thoughts?
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FRRACER
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With Oem and N1 pumps more so you need to use a 0.8mm restrictor. I know they come with 1mm as standard but no issues with 0.8mm and this is what HKS supplies with their kit. BB turbos only need a mist of oil. Also consider mines camb baffles to help with blow by
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AlexJ
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The PCV system is strictly for emissions, just block it off unless you local laws require it.
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Skyrel
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So HKS adds a second restrictor on the turbos? Hm. I cant remember if the seller gave me a set of banjos or if I used the OEM`s. I think the front turbo banjo is ok ish to remove, so its probably fastest to just remove the one I have to take a look. Thanks.
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Skyrel
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Quick update: I installed the restrictors, and the turbos still had lots of oil in the inlets. I cleaned it up, and blocked the breather hose on the rear turbo. I then took a new hose from the oil separator and to the driver side of the engine to the ground, cleaned up the turbos and took the car to a drag race. Launched and shifted @ 8000RPM for 7 runs.
The result was a small oil puddle under the car just where the new breather hose dumps. Im yet to inspect the turbo inlets, but I am quite sure they will be fairly clean as the new breather dumped a lot of oil to the ground. So it seems I had a turbo leak AND a blowby, but Im yet to see if the turbos stopped leaking. I will inspect this soon. On a side note I have noticed that the turbo lag has improved dramaticly where before they where sluggish from 4-5000RPM. I also had a boost cap of 1.1 bar before, now I run 1.2 bar up to 8000RPM. I believe that the turbos had to much oil supply before causing the problem. So the restrictors really made a difference. Im also very happy with the performance of the car, 7.75 seconds 1/8 mile, 1.7 60ft.
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CabbageMS
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Quote:
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#17 (permalink) |
Skyrel
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Im a little angry with myselfe for not updating this, I always try to keep solutions updated, but I guess my build thread got the update and so this was forgotten.
https://www.gtr.co.uk/forum/400890-s...r33-gtr-4.html Its fairly detailed in there. In short, I installed a 0.8mm banjo restrictor on each turbo, and the turbos responded with better response and more boost pressure. I had to do some serious work with the breather system to make it work though. Cheers
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