Source & Discussion link: http://forums.somethingawful.com/showthread.php?threadid=2759237
AMS, that crazy chicago based 4G63 tuning company (think 8 second, 1000whp+ EVO VIII), got there hands on a new EVO X.
President/Chief Tuner/Expert Crank-Walker's thoughts after some dyno runs:
"The first pull I thought we had a boost leak. The A/F went off the
scale rich and I can feel the engine bucking from inside the car as it
was choking up on fuel. The dyno graph showed a rough power curve and
to my surprise low power. A boost leak will cause a MAF car to run rich
so just to be certain I did a boost leak test on the car and it was
tight, not one leak. After a few pulls the power climbed and leveled
out at about 238-240whp. On average a stock EVO IX puts down around
255-260whp on our dyno, so about 15-20whp more than the EVO X. Peak
torque is about the same but as expected drops off up top compared to
the IX. After searching the forums this looks about right as other EVO
X’s are down about the same amount to the IX’s. So it looks like bad
news right? Well before we get all upset there are a few things that
look very promising.
We logged a bunch of parameters and found two interesting things. The
biggest surprise is how rich the car is running. I feel that by leaning
it out we’ll find a bunch of power, I’d guess 15-25whp just from that
alone. The next thing we noticed was boost. Boost peaked out at 22psi
and dropped down to only 13.5 psi at redline! A stock IX runs about 16
psi up top. If we can hold boost to 16-17psi I think that alone will be
worth an extra 25-30whp. Timing was very consistent and it never pulled
any timing during the pulls. If anything the timing seems to be a
little bit on the aggressive side so it will be interesting to see if
any gains can be had with timing adjustments. From just the air fuel
ratio and boost level adjustments I’m confident that we can put down
another 40-60whp. That would bring the EVO X to 280-300whp, which would
be very respectable with only those modifications. The team at AMS will
be working hard to bring you the latest information and improvements
regarding the EVO X."
I found that pretty weird especially since mitsubishi rated the X
higher than the IX. Even more interesting is the fact that around the
track the X still keeps up with the IX (not as fast, but not too far
behind), despite the lack of advantage in the horsepower and weight
departments.
But, there seems to be a pretty good uh... fix...
"Well we quickly bypassed the factory boost control system, which
oddly enough has two boost control solenoids. We set boost to peak at
the same factory level of 22psi but this time it held to 16-17psi at
redline. Peak power now climbed to 265-270whp, that’s more like it! So
now we’re holding roughly the same boost or 1psi more than an EVO IX
and we’re making 10-15whp more, looking good"
AMS, that crazy chicago based 4G63 tuning company (think 8 second, 1000whp+ EVO VIII), got there hands on a new EVO X.
President/Chief Tuner/Expert Crank-Walker's thoughts after some dyno runs:
"The first pull I thought we had a boost leak. The A/F went off the
scale rich and I can feel the engine bucking from inside the car as it
was choking up on fuel. The dyno graph showed a rough power curve and
to my surprise low power. A boost leak will cause a MAF car to run rich
so just to be certain I did a boost leak test on the car and it was
tight, not one leak. After a few pulls the power climbed and leveled
out at about 238-240whp. On average a stock EVO IX puts down around
255-260whp on our dyno, so about 15-20whp more than the EVO X. Peak
torque is about the same but as expected drops off up top compared to
the IX. After searching the forums this looks about right as other EVO
X’s are down about the same amount to the IX’s. So it looks like bad
news right? Well before we get all upset there are a few things that
look very promising.
We logged a bunch of parameters and found two interesting things. The
biggest surprise is how rich the car is running. I feel that by leaning
it out we’ll find a bunch of power, I’d guess 15-25whp just from that
alone. The next thing we noticed was boost. Boost peaked out at 22psi
and dropped down to only 13.5 psi at redline! A stock IX runs about 16
psi up top. If we can hold boost to 16-17psi I think that alone will be
worth an extra 25-30whp. Timing was very consistent and it never pulled
any timing during the pulls. If anything the timing seems to be a
little bit on the aggressive side so it will be interesting to see if
any gains can be had with timing adjustments. From just the air fuel
ratio and boost level adjustments I’m confident that we can put down
another 40-60whp. That would bring the EVO X to 280-300whp, which would
be very respectable with only those modifications. The team at AMS will
be working hard to bring you the latest information and improvements
regarding the EVO X."
I found that pretty weird especially since mitsubishi rated the X
higher than the IX. Even more interesting is the fact that around the
track the X still keeps up with the IX (not as fast, but not too far
behind), despite the lack of advantage in the horsepower and weight
departments.
But, there seems to be a pretty good uh... fix...
"Well we quickly bypassed the factory boost control system, which
oddly enough has two boost control solenoids. We set boost to peak at
the same factory level of 22psi but this time it held to 16-17psi at
redline. Peak power now climbed to 265-270whp, that’s more like it! So
now we’re holding roughly the same boost or 1psi more than an EVO IX
and we’re making 10-15whp more, looking good"
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