05-EVO-GSR

iTrader: (16)

After 5,000 miles of driving 100% stock, I decided it was time to go ahead and add some power to my 2013 EVO X MR. I did not want to go crazy and ruin the car so I went with the RRE Super Stock Mod Package:

Cosworth Drop in Filter
RRE 3 Port Boost Solonoid
RC 1,000cc injectors
DW Fuel Pump
Modified Stock Muffler

To say I am happy with the results would be an understatement. We got 307 awtq and 307 awhp on 91 octane and 340 awtq and 360 awhp on E-85. I will be staying on the E-85 map for daily use.

Dyno and Boost Charts:

goCJgoCJgo

Is this 26 psi on both tunes?

Oh nvm i see the graph on the bottom haha

marlonmck

what exactly did you do with your stock muffler to modify it i'm curious as i want to modify mine as well. but having an idea what you did to yours would help me

05-EVO-GSR

iTrader: (16)

http://roadraceengineering.com/blog/?p=1161
"
EVO X/RalliArt – Inside the Stock Muffler

We wanted to see what was inside a EVO/RalliArt muffler so we cut one open to see what made it work. As a kid I always got in trouble for opening things to see what made them work.

At low exhaust pressure the flow through the stock muffler follows these red lines. All the exhaust has to flow through _12_ little holes. Then into a chamber where the only escape is a bunch more holes. Then through a 2” pipe into the center chamber, then out through either of the interior tip pipes.
:-/


There is a spring loaded flapper door that prevents the exhaust from using the other parts of the muffler.

Once you make enough exhaust pressure somehow this flapper valve opens up. It is a heavy spring, takes maybe about 10-15 lbs pressure to move it.

Once it somewhat blows open, the flow can now follow the yellow lines below. Across into the left side, it can ricochet around a bit and make its way into the center section where it can go out the tip pipes (green lines).

So you can cut an access flap into the top rear of the muffler under the heat shield. We cut three sides of a square and fold the resulting flap up. We cut out this piece of pipe shown in yellow.

So now at all exhaust flow levels the exhaust can flow like in the yellow lines.

Like I said, it is wife and parent proof. You can pay with small unmarked bills so the expense goes unnoticed by the warden. While you might notice the slight sound difference because you knew it happened, no one else will and everything looks stock.
Here is what it looks like when doing the surgery:

Then cutting out the cross pipe:

Then now with the cross pipe cut out:

We then weld the two layers of the muffler cover back up.

We do this for $100 cash and carry exchange (you install it and give us back a clean stock muffler) or $140 installed while you wait.

Mike W
"

Darksun280

iTrader: (2)

I think that's stupid but that's just me. They proved years ago that the stock cat back back wasn't a restriction. Not like after market axle backs or cat backs void warranties either but to each his own.

Darksun280

iTrader: (2)

double post

05-EVO-GSR

iTrader: (16)

Graph 4 shows the stock boost profile VS. the 91 octane tuned boost profile.

Graph 3 shows the 91 octane boost profile (thin line) VS. the E-85 boost profile (thick line). We run less boost up to about 5,000 rpm to reduce the torque for the MR transmission.

mitra88

iTrader: (2)

I did this modification, and love it!

jondimellow

how much does this package cost?

05-EVO-GSR

iTrader: (16)

Cosworth Drop in Air Filter $43.00 installed
Modified Stock Muffler $140.00 installed
RRE 3 Port Boost Solonoid $95.00 installed
RC 1,000cc injectors $600.00 installed
DW Fuel Pump with E-85 safe hose $250.00 installed
Dual Map 91/E-85 Dyno Tune $600.00
10 gallons of E-85 Fuel $40.00
Hanging out at the RRE shop while your car gets tuned $Priceless
Total $1,768 cash money. Add 3% if you need to use your baby momma's credit card. Prices subject to change without notice and/or if you ask too many questions.

jondimellow

cool, thanks. so how did they tune both e85/91 on the same day? how did they change fuel?

EVOn9ne

iTrader: (3)

yeah they just drain the tank
flip to 4:10

Startbutton99

iTrader: (2)

super stock?!?!?! or super sleeperrrr!!! =DDD good job! and +1 for road race!

awdxftw

iTrader: (9)

outstanding bro, good stuff here!

zsak

are you on stock cat as well? I am looking into doing this same setup but with a test pipe and I already have a ams dp. Just wondering what gains it will have with those two mods. Also any updates on drivability or any issues since the tune. Thanks