Article by: RobRed

Applicable Models: 1998 – 2005 / 100 Series Land Cruiser or Lx 470

Final Dyno Runs

First let me say thank you for the support on this project from some key iH8Mud forum members;

Nakman, Plirky, SR.GRINGO, OregonLC, Romer, Lexi4Darin, Copenhagen1, SMM3, db2nsoaz, Supra88, Uzj100, Skolfoppa, CappyKD. You guys provided the financial support to do this project.

If you haven’t looked at the baseline run please take a moment and do so. This will give you the context for the next several comments. The before numbers are located here.

Initially I posted a baseline run that yielded 205 horsepower. Wow that’s great, but very unexpected. I was expecting 160-180 so to say I was shocked was an understatement. I suspected something might be up (OregonLC also hinted this) but I wanted to give you guys some progress on this so I posted what we had. Today I got access to the Dyno for the follow-up run and I had an opportunity to pour over the data collected from the previous “shockingly good” run. After reviewing the data sets and the output curves I have concluded that indeed the initial run I posted isn’t the correct one. In 8 out of 10 pulls the HP curve looked a lot different. In two pulls you got what I initially posted. After looking at many variables on the pulls I have concluded that HP number initially posted was wrong. I have corrected the first post (part 1) with an updated plot and associated data. I’m sorry for any confusion this might have caused but I am now solid on what is posted, both before and after.

When Interpreting this data it’s important to note that the DT Headers provided a gain everywhere, not just peak numbers. Drivability has been improved through out the rev range as well as more torque and HP at every RPM. The Land Cruiser makes over 200 ft-lb of Torque from at least 1900 RPM (the lowest we measured) to Redline. Not too bad.

Dyno Run
Vehicle: 2000 Toyota Land Cruiser
Mileage: 146,132
Configuration: Stock + DT Headers

Variables: 
Spark Plugs: OEM @ 139,003 miles
Airfilter: OEM @ 139,003 miles
O2 Sensors: Original @ 0 miles
Fuel: Chevron (CALIFORNIA) 91oct
Engine Oil: Mobil 1 5/30 @ 143,752 miles
Diff / XFer Oil: Mobil 1 75-90 @ 143,804 miles
Driveline Lube: Sta-Lube Extreme Pressure Moly @ 143,804 miles
Throttle Body: Cleaned @ 143,804 miles
Tires: Kelly Safari Trex 5/32 tread/OEM Diameter/36PSI cold pressure

Environment:
Land & Sea Pro 1000 All Wheel Drive Chassis Dyno
Altitude: 40’ above sea level
Air Temp in Bay: 75*
Ambient Air Temp: 66*
Intake Air Temp: 99*
AT temp: 127*
Coolant Temp: 192*
Gear Selection: 2nd Gear Used (power ECT was off)

Results:

This is peak – Look at the curve. There are rpms where the improvement is better than the peak difference.

Wheel Horsepower: 210.4 @ 4150 RPM (Gain of 21.6HP / 10.2%)

Wheel Torque: 281.4 @ 3200 RPM (Gain of 12.3 ft-lb / 4.3%)

* Averaged or merged over 3 back to back runs. Each run had a 2 minute interval between them.