New HS Gen 6 header tested, New JWT S5 cams tested lots of power bolt on style dawg

[mike kojima]

Since a lot of you are not on the forums, here is some
stuff you might find interesting about the latest
things going on in low buck mods.

OBX eat my shorts!

Mike

Ok today I tested the Protoype for the new Hotshot Gen
6 header. This header kicks serious ass, it is going
to be by far the most powerful header avalible with
the broadest powerband. Don't ask me for details on it
nor when it is going to be for sale. Dont call Hotshot
and bother them about it yet either. This was just the
first bit of testing for power. It still has to be
race tested to amke sure it is crack resistant, etc
and details won't be released until a patent is
applyed for.

The test motor was a bone stock high port DE long
block with S4 cams, UD pulleys, HS CAI and JWT ECU.
The engine was baselined at 156 WHP with a Gen 5
header. Then the Proto Gen 6 was installed, BTW, its a
4-1 with some twists for a broader powerband. The Gen
6 made 162.5 hp with a gain of 8 hp at 5500 rpm and 10
hp at 7600 rpm. The gain was at least 5 hp from about
4400 rpm on up. Interestingly the new header made 4
more hp at a low 2000 rpm. In fact the header made
more power from idle all the way to the fuel cut. That
broad fat hp over the Gen 5 which is no slouch either
in the power producing department.  With bigger cams,
I think more power can be expected as the tuned length
is based for an exhaust cam of around 270 degrees.  I
think this is a genuine 20 whp header on some
combinations.

Next the S4's were replaced with JWT's new S5 cams
which have 272 degrees duration and and whooping .507
lift on stock valve springs! We experimented with cam
timing and found best powerband at intake 7 degrees
advanced and exhaust 7 degrees retarded. The idle was
pretty rumpy so the ECU was reprogramed with JWT's C3
idle program which smooth things out to where it would
be reasonably streetable.

With the cams lobe centers tightened, the S5's lost
2-3 hp from idle to 4600 rpm making considerably more
power than the S4's above 6000 rpm. The engine rocked
out 168.3 whp when we were done adjusting cam timing.
I was pretty impressed with the potential of a fairly
inexpensive all bolt on stock motor here. Not needing
valve springs is a big cost savers. Now the S5 does
not have as radical ramps as the C series cams so they
don't have the area under the curve. Expect C cams to
make more power still.

168 is nothing to sneeze at. Considering that a Type R
makes 166-168 whp with less torque. The S5's are now
avalible for sale. For best results you must have a
very low restriction exhaust system and you must get
the adjustable timing gears. You don't have to get the
idle program but its nice. These developments are
exciting. This means that with the new header and C
series cams, you can probably be in the 170's with a
stock bottom end. In the next few weeks I'll be
testing a short runner manifold on a bolt on motor.
Perhaps with C3's, some tuning and a manifold, 180 whp
will be posible bolt on style!  I think for sure with
C5M's if you are willing for a soggy bottom end.

SR20 tuning technology is martching right along.

Mike