Quote:
Originally Posted by Boxer486
I call Bullshit on that dyno. It just seems way too proportional and linear to its baseline to be accurate. Seeing that much torque improvement down so low makes no sense using a larger TB, especially on this engine making 100hp/L. Without using something like a venturi no way does just increasing throttle body diameter improve lowend response. In fact you slow air down and create hesitation. Defies physics. If you like the feel of your torque dip, you'll LOVE the feel of a larger throttle body. TB are for larger displacement engines with choked airflow or dyno queens looking a few more largely irrelevant peak.
I also can't see if they didn't add more than just the TB like a full system and/or a tune. Btw, there are some tricks you can do to make a dyno improve or lie within that margin of error.
Look what I found:
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To be honest, I am a beginner in this field.
I do not have too much background knowledge in this topic.
(The torque unit which that Japanese website using looks different. I am not sure that is big improvement in low RPM or not)
I personal believe that Big TB is the similar case as intake pipe.
It will slow the air flow when the diameter is increase.
It should cause losing the torque in the low RPM. It is what I learn in physics.
However, here is some intack pipe result. We can see the torque result
in the low rpm. Actually, it shows slightly increase.
Perrin
http://perrinperformance.com/i-13324...-fr-s-brz.html
Zetaperformance
http://www.zetaperformanceltd.com/ca...201/image/661/
I do not know how to explain this. It is not match what I learn.
Here is the same case for BPB. It should strongly benefit for the low RPM
from the physics or I should say that we should see the different from the dyno at least.
However, it looks almost same result as stock in low RPM.(It helps
a lot in middle range)
I am not trying to say big TB will help. However, it might something
useful there, because there are a lot of aftermarket big TB for BRZ now.
I will be a little bit surprising me that they all try to bullshit.
I also not very trust the BPB at beginning as the same logic, because
I did not see any other aftermarket BPB.
However, I saw so many dyno evidence from Crawford BPB.
It convinced me. I also hope that I can see some big TB dyno result
for BRZ, before I try to challenge those aftermarket TB company
are bullshit or hope those company can show more dyno result.
Thanks.