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Interesting enough to post.....more BR Pro Catch Can information.

* * * * * 1 votes catch can fbo flex fuel cobb buschur racing coolant tank

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#21
Jared@SFS

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 That just seems like a shocking result to me as it would seem to require *really* leaky rings to allow there to be such a measurable change by getting rid of only 0.6 psi of crankcase pressure. So this is why I keep probing the topic to find out if I'm missing something or what.

 

A healthy motor depending on direct application can have as much as 20% leak down and be considered healthy. So I don't know that I'd say they need to be really leaky. .6PSI is a lot of pressure when you consider a ideal scenario is vacuum in the crank case.

 

Actually I think we all missed a key point, David said he added timing. The reduced pressure is preventing excessive oil to get by, contaminated the fuel mixture, allowing the timing.


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#22
HiBoost

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Check post 4, that's exactly what I said last night before everyone started talking about fuel trims lol.
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-Jeff

#23
Buschur Racing

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I'm not a technical/educated enough guy to answer what you are asking for hiboost.  I know what I see from results of testing things and I go from there.  I can't explain some of it but I add it to my small brain as what works and what does not.  

 

My car was running 158.xx mph and I thought it was 100% tapped out.  It is now running 164.8 mph and I don't think it's tapped out.  No engine, cam, turbo, intake manifold or head changes.  It has been small stuff I've found experimenting with ideas.  Catch can, mid pipe, exhaust, turbo inlet placement.......each of those things showed me something on the dyno and even the combined total of everything hasn't added up to the WHP anyone would think it takes to gain 6+ mph in the 1/4 mile and yet, there the car is running those speeds.

 

I don't think you are calling bullshit on what I've posted.  What I've posted has been my observation twice now and it's consistent.


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BR160 package, stock turbofolds, 8.33@168.68 mph, E80 fuel.
BR160 package, stock turbofolds, 8.74@160.08 mph, 93 octane.
Standing 1/2 mile 199.29 mph

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#24
Buschur Racing

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A healthy motor depending on direct application can have as much as 20% leak down and be considered healthy. So I don't know that I'd say they need to be really leaky. .6PSI is a lot of pressure when you consider a ideal scenario is vacuum in the crank case.

 

Actually I think we all missed a key point, David said he added timing. The reduced pressure is preventing excessive oil to get by, contaminated the fuel mixture, allowing the timing.

 

Very agreed on all of this.


www.buschurracing.com

BR160 package, stock turbofolds, 8.33@168.68 mph, E80 fuel.
BR160 package, stock turbofolds, 8.74@160.08 mph, 93 octane.
Standing 1/2 mile 199.29 mph

COBB TUNING DEALER AND PRO TUNER

BUSCHUR RACING on FACEBOOK

BR SHOOTOUT on FACEBOOK

#25
Jared@SFS

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Check post 4, that's exactly what I said last night before everyone started talking about fuel trims lol.

 

I guess I missed that!



#26
HiBoost

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I'm not a technical/educated enough guy to answer what you are asking for hiboost.  I know what I see from results of testing things and I go from there.  I can't explain some of it but I add it to my small brain as what works and what does not.  
 
My car was running 158.xx mph and I thought it was 100% tapped out.  It is now running 164.8 mph and I don't think it's tapped out.  No engine, cam, turbo, intake manifold or head changes.  It has been small stuff I've found experimenting with ideas.  Catch can, mid pipe, exhaust, turbo inlet placement.......each of those things showed me something on the dyno and even the combined total of everything hasn't added up to the WHP anyone would think it takes to gain 6+ mph in the 1/4 mile and yet, there the car is running those speeds.
 
I don't think you are calling bullshit on what I've posted.  What I've posted has been my observation twice now and it's consistent.


Yeah I'm at the opposite end of the spectrum from calling bullshit. I'm taking your results as facts and trying to explain them. I'm a damn computer programmer, not a mechanical engineer, so I certainly don't have all the answers. I just find this stuff fascinating and I try to pick brains whenever I can. If you guys were doctors I'd be asking you medical questions. That's just the kind of annoying nerd I am!

One final comment on the topic at hand. I guess what I learned in all of this is that perhaps rings leak a lot more than I had previously thought. I've done leakdown tests before and I know that 10% isn't an alarming number, but that's in a "static" situation. I always looked at it like this: how much air will a tiny pinhole in a balloon let out? Well, it depends on the time given, doesn't it? If you let it sit there for a minute it will let all of it out. If you only consider 1/1000 of a second, then not very much. I assumed the piston rings were a similar concept. 10% "just sitting there" seems fine, but when moving at 7000 rpms there wasn't enough time for a significant amount to leak past, or so I thought. I guess I still find it hard to believe that the same 10% would get past the rings under load because wouldn't that *hugely* pressurize the crankcase? But anyway that's why I was thrown off by the results here, or more accurately, thrown off by the only theory I had to explain it. Seemed far fetched (the theory not the results). But again, on a good day I'm lucky to know 10% of what could actually be known about this topic. Thanks for the discussion!
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-Jeff

#27
2highpsi

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Good read!

 

 

I love threads like this :)


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2014 Deep Blue Pearl Track Edition GT-R Alpha 7+  #80 of 160


#28
JCR_GTR

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Very interesting, let's get one on the JCR Demo GTR David
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#29
7racer

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Good read!


I love threads like this :)


Agree
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In7anity!!


#30
Autobacs

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Yes I do like this thread too. Even more so because I have the PRO catch can myself :)


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