My car ran much better with a tune. Smoother & better power delivery across entire range. Although I agree that mods will help, it's been documented that a stock setup will also show gains.
---------- Post added at 11:47 PM ---------- Previous post was at 11:45 PM ----------
rev limiter is also set fairly low on stock. you can safely raise that up to 7500 rpm on a non built VQ
---------- Post added at 11:53 PM ---------- Previous post was at 11:47 PM ----------
Just for info re. reflashing:
After exhaustive research and development on both the hardware and software, Technosquare is offering ECU flash reprogramming of flash type Nissan ECUs for racing applications and performance enthusiasts.
Current Nissan ECUs come with VERY sophisticated engine control functions, such as a constant O2 sensor feed back system and torque management by an electronic throttle control system. In another words, the ECU has complete control of the engine, not you. When it comes to performance modification and driving, these systems will get in your way, as the factory ECU is set to work best with the stock configuration of the vehicle and ordinary drivers.
When you start modifying your Nissan, you will find it very difficult to gain output by just adding performance parts. In some cases, you even lose some power and torque. Since the ECU is unable to automatically detect the modifications you made to your engine, it will still try to work within the parameters set for stock condition.
The Technosquare ECU flash changes these parameters to the specification of the performance parts installed, so the ECU knows how to behave under modified configuration and fully utilize the intended capability of those new parts.
The Technosquare ECU flash also changes the electronic throttle control setting.
Even if you push the gas pedal to floor, it doesn't mean your throttle is opening 100%.
Nissan sets the throttle characteristic for various particulars, such as torque management for drivability, or Venturi effect for faster induction and more. This is fine for the average Joe content to run his car stock, but a lot of enthusiastic drivers find it very annoying.
Technosquare puts you in control of the throttle (but still maintaining VDC or TRC features), so when you step on the gas pedal all the way, the throttle opens all the way and stays open.
As the result, engine can utilize higher flow intake and exhaust system improving (optimizing ?) throttle response.
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350Z TECHNOS ECU Introduction [/FONT]
[FONT=Times New Roman, Times, serif]The power of the VQ35DE has now been unleashed in the 350Z. With a strong midrange torque and the elimination of the power-lag at
the top-end, the Z is reborn.[/FONT]
[FONT=Times New Roman, Times, serif]The long awaited ECU has finally become available. Introducing 350Z TECHNOS ECU upgrade.
After hundreds of hours of R&D and numerous Dyno pulls, we have successfully developed this ECU, as part of a performance upgrade.[/FONT]
[FONT=Times New Roman, Times, serif]Please follow the links to find out more information about product.[/FONT]
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FEATURES:
[/FONT]
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REV limiter modification
A 7100 RPM (stock 6600 RPM) rev limit is set to take advantage of top end horsepower.
The stock rev limit was set way too low. Some of you may be having the problem of hitting the fuel cut at hard acceleration. We found this very annoying as we increased power at the higher rpm range. Hitting the rev limiter too often, could actually damage the engine since it is achieved by cutting fuel. By adding an extra 500 rpm, we can avoid hitting the rev limiter while protecting the motor.[/FONT]
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Speed Limiter Removal
The speed limiter is removed. The stock limiter was set at 250Km/h (156 MPH), so for all practical purposes, we could have left it alone. But we decided to remove it, just in case someone feels the need to go beyond that.[/FONT]
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Ignition Timing Map Adjusted
There 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 higher end to take additional advantage of higher-octane gasoline. This aids in improving torque from 3000 rpm and up.[/FONT]
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Fuel Map Adjusted
Stock 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 10.5 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.[/FONT]
[FONT=Times New Roman, Times, serif]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, blowing the lid off what was thought to be an automobile already running pretty near its maximum capability.
[/FONT][FONT=Times New Roman, Times, serif]Our testing was done with a stock Track Model 350Z.
Gains: 10+ HP, and 8~9 ft-lbs from 3000rpm[/FONT]
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(Fig. Dyno-Jet result)
View attachment 291288
(Fig.Bocsh Dyno result)
[FONT=Times New Roman, Times, serif](Fig.Dyno-Jet no.2)[/FONT]
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Changed air intake system
One 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.[/FONT]
