The dyno ***** was at it again-this time to see what kind of power was to be had by removing the B-pipe and muffler from the equation. The motor posted a previous best of 242.2 through the muffler. Today it managed to squeeze out 243.3 peak HP. Noteworthy is a new dip at 4,400 RPM with the open exhaust, and the reduction of a big dip at 6,600. From about 5,800-8,400 the open exhaust really outperformed the muffler and B-pipe. At 6,600 the open exhaust made about 10 ft-lbs. of torque and about 12 HP more.

 

Nice!
So it looks like muffler for the street(backpressure=better midrange) and straight through for the track?
BTW, theres a booger on that graph lol...

 

what exhaust WAS being used?

 

Booger = Haha

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegasaurus &raquo;</TD></TR><TR><TD CLASS="quote">what exhaust WAS being used?</TD></TR></TABLE>
Mugen.
And it was a piece of popcorn, a corn husk -funnymen.

 

nice

 

was the b pipe also mugen? the piping before the resonator is quite small, smaller than stock itr b pipe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by an2ny888 &raquo;</TD></TR><TR><TD CLASS="quote">was the b pipe also mugen? the piping before the resonator is quite small, smaller than stock itr b pipe</TD></TR></TABLE>
Yes, but the B-pipe has been modified. It's 2 1/2" from the resonator to the header-no cat.

 

Very interesting test. Thanks for sharing it

 

..Good job as always b19.

 

Have you tried using a race pipe? A 2.5'' piece of pipe about 3 feet long straight from the header?


nice #s

 

(b19coupe),
also if you have upgraded the b-pipe before the resonator to 2.5, the pierced tube that crosses the resonator's inside, driving the gas to the second section of the b-pipe, is still 2.25 ID.
So you have a big bottleneck there.
A 200 whp b18c going from a modified Mugen b-pipe (2.36 OD before the resonator too) to a true 2.5 OD custom resonated b-pipe, gained 4 whp in the upper power band with the same Mugen twin loop muffler.
Since you have a 2l high output engine the gain should be much more.

 

wat header wat it on this engine?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paulITR &raquo;</TD></TR><TR><TD CLASS="quote">Since you have a 2l high output engine the gain should be much more.</TD></TR></TABLE>
It's a 1.8. ITR crank with 81.5mm Wiseco pistons.
Setup:
Engine:
ITR block/crank.
81.5mm IB Spec Wiseco pistons (11:1)
IB ported ITR head. Stock valves.
IB ported ITR intake manifold.
70mm TB, custom intake.
Hytech header-Mugen TL cat back.
440 cc injectors, Hondata.
This intake:

 

good ****

btw...how is that IB ported intake manifold?
i was looking at it on his site and looks like some good work

 

Soon this place will be a haven with dyno graphs showing all sorts of things/trials/errors/setups. Nice addition.

 

would this increase bottom end torque or top end or what would this do?

 

Realy nice graph and results, Thanks................so practically open exhaust help only on midrage and no at top-end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kanagias &raquo;</TD></TR><TR><TD CLASS="quote">................so practically open exhaust help only on midrange and no at top-end. </TD></TR></TABLE>

The gains with the 2.5 b-pipe were in the same powerband's part of the open header.

 

Very impressive results as usual Todd...

I am considering a ported intake manifold from Jeff.. I also need to borrow your majic intake for my next dyno session..
Hopefully I can improve my numbers with those..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALLMOTOR18 &raquo;</TD></TR><TR><TD CLASS="quote">I am considering a ported intake manifold from Jeff.. I also need to borrow your majic intake for my next dyno session..
Hopefully I can improve my numbers with those..</TD></TR></TABLE>
You will

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALLMOTOR18 &raquo;</TD></TR><TR><TD CLASS="quote">

I am considering a ported intake manifold from Jeff.. </TD></TR></TABLE>