Post by
mcheddadi »
https://forums.nicoclub.com/mcheddadi-u65598.html
Sun Dec 14, 2008 6:21 am
they don't need the car, they specialize in vq3ede tunning
so they are just going to apply there default upgrades and run some simulations
FEATURES:
REV limiter modificationWe found that with the ECU upgrade, more power can be gained with a higher rev limiter. A 7100 RPM (stock 6600 RPM) rev limit is set to take advantage of top end horsepower, while still providing a safe protection for the motor.
Speed Limiter RemovalThe stock speed limiter of 236 km/h (148 mph) has been removed.
Ignition Timing Map AdjustedThere wasn’t much room for improvement at the bottom end since the ECU retards a lot of timing by using a feed back system in stock trim. So, we have added more timing at the mid range - high end to take additional advantage of higher-octane gasoline. This aids in improving torque from 3000 rpm and up.
Fuel Map AdjustedStock fuel was set to detune the top end horsepower. We discovered that the car runs extremely rich after 5000 rpm. Air to Fuel ratio (A/F) of 10.8 was found right before the stock rev limiter kicks in. Cleary, Nissan was trying to detune the power output at higher rpm to discourage the driver from hitting the rev limiter. For the performance enthusiasts, however, this is unsatisfactory, so we set the A/F to 12.5 all the way to redline to provide adequate power gain while still maintaining a safe margin.
Drive By Wire AdjustmentThrought our testing we found, the drive by wire system was program to never fully open (throttle flap) when you smash the accelerator pedal. In fact, it actually closes the closer you get to the rev limiter, by as much as 20%. This restricts air into the motor and causes HP and Torque numbers to go down. We have remapped this setup so when you go wide open throttle, the throttle flap fully opens and STAYS OPEN, increasing HP and Torque.
Adding to above modifications, a few other adjustments were made to other maps to enhance the feedback function which improves power, torque and drivability. The resulting achievement is a remarkable improvement in driving feel, which is more than what numbers alone can tell you. We are very satisfied with the results and are proud to release our TECHNOS ECU for this tuning-challenged ECU.
(Fig.Bosch Dyno Result)~15 HP Gain at the Crank in stock rim
Changed air intake systemOne of the major problems on this car was a feedback system that compensates for modifications. The oxygen sensors detects fuel mixture and will tell the ECU to richen up or lean out the mixture. This correction factor was way too wide, so some performance components upgrades (intake, exhaust) would actually result in a loss of HP below stock!We adjusted the correction factor to reduce that compensation reaction. Our tests showed consistent power and torque improvement following installation of an intake system.
More testing results coming soon!