This is a write up that Naji (Looney Tuning) did on my car. Thought I would share and was wondering what you guys suggested to help with bigger numbers. He advised me to get the 05 Evo hotside which is 10.5 compared to my smaller 03 hotside. And to port my exhaust manifold.

This 2003 Evo 8 used to be Turbo Magazine’s project car. It is probably one of the earliest Evo 8s in the US. You can read about it here:
http://www.turbomagazine.com/tech/05...t_3/index.html

The car had the following mods:

Tomei 260 Cams
Tomei Titanium valve springs/rockers
Tomei cam gears
HKS Twin Plate Carbon on Carbon Racing Clutch
AEM Intake System
Forged Motorsports Racing Bypass Valve
XS Engineering Ignition System
Full Exhaust System (V-i-s-h-n-u) w/downpipe. test pipe
XEDE Engine Management with Smart Sytem (disconnected)
Methanol Injection system (Run off of XEDE) (disconnected)

The owner of the car wanted to sell it, but the car was having a problem with the Xede. The car would run well for a couple of weeks and then it will fall on its face. The owner finally sold the car, but as part of the agreement I was asked to tune it. Today I was finally able to do just that.

When the car arrived the Xede was almost removed. The only thing that was not connected to the ECU harness was the light green boost wire. So the car was running wastegate boost. The car also still had the solenoid boost emulator that is attached to the stock boost hose. This small cylindrical attachment has a pinhole in it. It bleeds the boost causing the turbo to build more boost.

We removed the Xede, the LC-1 (for the SMART), and the emulator. We kept the WBO2 sensor and I plugged my LM-1 into it.

We decided to forgo a baseline and go straight for the tune. The car had a misfire during certain 3rd gear WOT logs. It also had the stock injectors and was hitting 98% IDC since the pill holds 1 psi more boost up top than the Xede boost control system. So I decided to tune it somewhat conservatively. Here is the way the boost and AFR ended up (The boost in brackets is peak boost that Logworks selects from multiple runs):


Peak boost was 21.67 psi from 4 runs, but the average peak boost was 20.54 psi. By redline the average peak boost was 18.20 psi, but the peak was 18.96 psi.

Even though the tune was relatively conservative (especially boost at peak), the car still put very good power numbers. Below are the highest power logs from two logs taken at different on-ramps. There was no benchmark to do a before and after comparison.



The previous owner of the car tells me that the new owner will add injectors and a FMIC to the car and come back for a re-tune. I would love to see what this car can do once the misfire is fixed, injectors are added, as well as a FMIC.

Just want to share this data with you. Since I used conservative boost at peak on this car and held it to 18 psi by redline, I compared one chart from this car to another chart of an mbc equipped car. Both cars had 18.xx psi by 7000 rpm, but to achieve that 18 psi by redline on the mbc equipped Evo, I had to spike the boost at peak to 22.64 psi. The ECU boost control on this Evo allowed me to achieve the same 18 psi by redline while keeping the peak boost at 20.89 psi, 1.75 psi less than with the mbc equipped Evo.



Also notice what the misfire did to the log on this car. It dipped the 2byte load, the IDC, the load error and bumped the AFR. A misfire usually gives a bump in the AFR since there is more oxygen in the mixture than there should be.