One of our customers, Daniel (Yahu), decided to upgrade his journal bearing black on pump/meth to the ball bearing black.

While I wasnt expecting to see any more peak power since nothing really has changed, I was curious to see how much the response differed. On the street I must admit to not really feeling much of a difference. Then again I was running the car at 29.9psi where during the test I had it 24.

Brief description of the test process-

Bring car up to temp (176*) and accelerate to 3700 rpm, coast down in high vacuum, and then stuff it at 2700 to see how fast it responds. In this test I got clean run after clean run but had issues synching the starting rpm and the one time I did it phantom knocked in the mid range. The results still speak for themselves.



Mod list-

Evo IX
ER SR2.4
Bushmaster ported IX head
GSC S2 camshafts
Magnus V5 cast intake manifold
ER SD tune with Omnipower 4 bar
FIC 950s
AEM meth kit
255 LPH
3" Buschur TBE
etc.

 

I take it the red graph was the BB?

 

Correct

 

nice info John

 

Definitely a nice gain through out and at low boost. That dip through the middle is because if the phantom knock?

Thanks for posting Aaron!

 

^+1 Pretty Nice gains for sure! like to see what a little more boost will do. Thanks for the info.

 

Nice Job Aaron!

 

Both plots have the same boost.
You can see that clearly at the bottom of the sheet.

 

Thank you for pointing out the obvious .

 

good torque figures and bellow 4500rpm

 

Now since i cant see the color differences between the 2 graphs

which turbo made better power @ 3500 & 7500 rpm?

any idea if the original fp-blk had the same spec turbine wheel as the DBB unit?

I recall people stating that some turbine wheels were cut back more than others with regards to the fp-blk...

Nice compare btw

can the owner of the car enlighten us by describing the transient city driving response / romp sessions between the 2 turbos?

 

beast

 

Just noticed that the color is hard to distinguish. I'll make another jpg when I get back to the shop on monday. To answer your question, the DBB made 25 ft lbs more at 3500 and at 7500 was up 23whp. The power differences started to diminish as the boost went up though. Some of the power could have been (most likely) I was playing with the MIVEC above 5k and before it hit peak backpressure it would gain. Once it gets to the point it cant dump enough exhaust it doesnt matter of course.

aaron

 

Thanks for helping the colorblind out!

similar turbine wheel specs?

 

dont know why these threads get posted?
quite simply the BB center is NOT responsible for the gains seen here.
the average consumer just will simply believe the BB black makes more power because of threads like this.