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Gcg Or Kkr Turbo?

Guest Rotary20B

By Guest Rotary20B,
in Engines & Forced Induction

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Guest Rotary20B

Guest Rotary20B

Posted
Posted
in all fairness you can't really say the kkr turbos are bad.

sure they'll work and give you some good performance but the fact of the matter is they won't match the performance and reliability of a gcg bb turbo

So the KKRs aren't reliable?

I have read of a few good reports about them, but wanted to get peoples first hand experience.

As for performance, they are actually better than the GCG which is the reason I am looking at them. apart from them being non bb that is, which doesn't bother me one bit.

Relibility is an issue though if you know something.

paulr33 Grand Master

paulr33

Posted
Posted

theres 5 main things that come to mind when we talk about bb vs non bb

1) price difference

ball bearing units are often more expensive. they are expensive for the obvious reason, they are better. but presumably it comes down to balancing the unit possibly different and/or using different equipment / skill in the engineer lab to build bb units

2) spool up or "response"

with non ball bearing it will take longer to spool up

theres a graph floating a round somewhere of bb vs non bb spool up

i think it was about 2 second different in turbine speed response for bb vs non bb.

3) failure rate

another issue of non bb is theres a chance of bearing failure when the oil feed is cut off and the bearings are hot. that is if you go for a hard run, and instantly cut the engine off / oil feed. bb have a greater tolerance to heat, whereas the plain / journal brothers do not and can fail. ie if you are doing a run and say stall the car or have to turn it off, say cops pull u over or something.

4) oil feed changes

for plain / journal bearings the oil feed needs to be modified to flow more oil into the bearings. they need more oil to keep the flowing and lubed up. bb need less oil so they have a restrictor in the oil line by default. with the journal / plain brothers you need to usually remove the restrictor and or make the oil line bigger / better to flow more oil.

5) oil lifespan

as the bearings need more oil flow into them, they go through more oil, that is more oil is pushed through the bearing core to keep it happy and lubed. so your engine oil is "used" at a faster / higher rate than the same engine with a bb turbo unit. im not sure what this means in terms of oil life span in your engine but say bb oil change are every 10,000 you may be to changing it every 7000 k's (guesstimation) if using journal / plain bearing units

so there are a few considerations to take into account. hopefully some of the info ive provided may help you make a descision as there are pro's and con's for both bb units and non bb units. we notice that oem manufacturers (well at least we think they do) prefer bb units over non bb units for things such as reliability, longer life span, better oil lifespan, better response and less km's between rebuilding them. if any of the info ive provied is wrong please let me know and ill correct it. the more we all learn the better it is for all of us

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