Project Evo X GSR - Keeping Cool with Greddy and Koyo

By Mike Kojima

When we last left off with our Project Evo X, we had achieved some good results with simple bolt ons from Greddy and AMS in the form of an exhaust system and a downpipe.  With some further open source ECU tuning we were then able to extract another pretty good gain from our car.

Unlike the older Evo IX, the Evo 10 is a bit harder to get tons of bolt on power from due to its smaller turbo.  Mitsubishi probably wanted to make the Evo X faster responding by reducing turbo lag so the stock turbo is more efficient at spooling quickly but dies out on the top end.

We wanted to see what the limits of power for easy bolt ons were and if you could get much more power with the stock turbo.  Since we planned on increasing out boost possibly past our turbo's most efficient areas on the compressor map we decided to install Greddy's upgraded Evo X intercooler to keep our intake charge cool.  While we were in there, we also decided to change our stock radiator out to one of Koyo's new Hyper V radiators.


Greddy's upgraded front mount intercooler for the Exo X is huge, it's about as big of a core as you can get to fit in the nose of the car.  It has efficient tube and fin construction and nicely shaped end tanks for good flow.  It is a direct bolt in replacement for the stock intercooler.
The intercooler has a fairly thick core, about 3.5" thick.  With a tube and fin design, this is acceptable as the more open tube and fin pattern allows air to penetrate the core better than a denser bar and plate type intercooler.
You can see that the Greddy core has a flow divider which routes air to the top rows of the core for better efficiency.  This is a pretty unique feature that we think more intercoolers should use inside the end tanks.  You can also catch a peek at the inner tube turbulators.  These turbulators help provide more surface area to transfer heat to the outside of the tube better.
The kit comes with hard pipes that replace the rubber hoses in the charge piping.  Believe it or not, hard pipes usually make a difference in throttle response and produce a measurable power difference on the dyno.  This is because the rigid pipe does not expand under boost and instead transfers all of the air directly through.  This reduces the compressor workload and thus reduces backpressure.  We have proven this on several of our project cars.  The Greddy kit comes with clamps, silicone couplers and a Greddy competition blow off valve with a recirculation kit.
Here is the Greddy intercooler on the bottom compared to the stock intercooler on top.  Unlike the older Evo 8-9, the Evo 10 has a pretty efficient stock intercooler.  The older Evo's get big gains with a properly engineered intercooler but the Evo X unusually doesn't.  Will our results be any different?




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Dusty Duster
Dusty Dusterlink
Monday, November 19, 2012 5:10 AM
I'm very impressed with the fit and finish of Greddy products.
Monday, November 19, 2012 6:32 AM
So are you guys MotoIQ still working on the EvoX MR that you did the SST cooling upgrades to or just this GSR?
Dusty Duster
Dusty Dusterlink
Monday, November 19, 2012 7:53 AM
I believe the consensus was that the dual-clutch transmission was nearly impossible to keep from overheating on the road course. As a result, MotoIQ got a hold of a manual-transmission-equipped Evo X to use instead.

Monday, November 19, 2012 9:26 AM
/facepalm, I forgot all about that.
Turbo Shangbanger
Turbo Shangbangerlink
Monday, November 19, 2012 10:03 AM
Nice system...btw...also made in China.
Mike Kojima
Mike Kojimalink
Monday, November 19, 2012 10:26 AM
We are still going to do some stuff with the MR but it's limited to what the transmission can take.
Der Bruce
Der Brucelink
Monday, November 19, 2012 10:39 AM
I am really digging the way you guys are going about upgrading this X. Smart and piece by piece gives us all a real understanding of both where to find our limits and how to find the new ones!
Monday, November 19, 2012 11:10 AM
any particular reason you guys decided to move the bov away from the TB like the stock configuration? I thought it was best to keep the bov as close as possible to the TB so that as much of the pipes and intercooler is already pressurized when you get back on the gas...
Mike Kojima
Mike Kojimalink
Monday, November 19, 2012 1:57 PM
For no better reason than that's where Greddy put it!
Ryan Georgas
Ryan Georgaslink
Monday, November 19, 2012 11:28 PM
Beautiful hardware but it seems like you're taking medicine before you have symptoms. You know the turbo is the bottleneck, fix that!
Mike Kojima
Mike Kojimalink
Monday, November 19, 2012 11:40 PM
well we had to confirm that.
Tuesday, November 20, 2012 7:56 PM
I would like to know why the greddy kit doesn't include t-bolt clamps
Mike Kojima
Mike Kojimalink
Tuesday, November 20, 2012 10:05 PM
T-Bolt clamps are not necessarily better. Eric hates them.
Wednesday, November 21, 2012 10:38 AM
I think a big concern with t-bolt clamps is it's much easier to crush an aluminum pipe.
Wednesday, November 21, 2012 8:43 PM
The baffle/air diverter in the end tank of the intercooler is a good design feature. I'm amazed more don't have them.
Thursday, November 22, 2012 8:10 AM
It looks like there's aluminum on aluminum contact between the AC and radiator, had you considered perhaps wrapping the AC in tape before dropping it onto the radiator?
Mike Kojima
Mike Kojimalink
Thursday, November 22, 2012 9:39 AM
There is not, it is hard to tell in the picture but there is over 1/4" minimal clearance. The intercooler comes closer but their are rubber bump pads to keep it from hitting.
Sunday, November 25, 2012 10:57 AM
Not to belabor, but wife can't drive stick, was thinking MR. Is that a worthless endeavor?
Mike Kojima
Mike Kojimalink
Sunday, November 25, 2012 4:03 PM
It's ok if you don't drive it on the track without extra cooling and stay under 400 hp.
Tuesday, December 04, 2012 8:44 PM
400 at the wheel? that'd be enough for me!
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