WOT question
I beleive the ts ecu fixes this.
Maxima Technos ECU FLASH
Maxima TECHNOS ECU Information
The Maxima has always been a popular, comfortable, sporty family sedan. The only thing it needed was bit more power. More power was definitely on our mind, along with safety, when we developed this ECU upgrade. After reviewing the data tables and comparing it to the 350Z and G35, we came up with the best optimal fuel and timing curve to unleash the hidden power from your Maxima.
How much is it? - Pricing Information
Need another ECU for spare? - ECU Duplication
Need custom tuning for special mods? - Custom Tune ECU
How to do I reset my ECU? - ECU Resetting Procedures
How do I remove the ECU ?-
Got Questions? - FAQ
FEATURES:
REV limiter modification
We 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 Removal
The stock speed limiter of 236 km/h (148 mph) has been removed.
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 mid range - high end to take additional advantage of higher-octane gasoline. This aids in improving torque from 3000 rpm and up.
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.
Drive By Wire Adjustment
Throught 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.
Maxima Technos ECU FLASH
Maxima TECHNOS ECU Information
The Maxima has always been a popular, comfortable, sporty family sedan. The only thing it needed was bit more power. More power was definitely on our mind, along with safety, when we developed this ECU upgrade. After reviewing the data tables and comparing it to the 350Z and G35, we came up with the best optimal fuel and timing curve to unleash the hidden power from your Maxima.
How much is it? - Pricing Information
Need another ECU for spare? - ECU Duplication
Need custom tuning for special mods? - Custom Tune ECU
How to do I reset my ECU? - ECU Resetting Procedures
How do I remove the ECU ?-
Got Questions? - FAQ
FEATURES:
REV limiter modification
We 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 Removal
The stock speed limiter of 236 km/h (148 mph) has been removed.
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 mid range - high end to take additional advantage of higher-octane gasoline. This aids in improving torque from 3000 rpm and up.
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.
Drive By Wire Adjustment
Throught 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.
Senior Member
Joined: Nov 2007
Posts: 217
From: North Coast NSW, Australia
With the stock ignition timing and fuel maps along with a stock exhaust/intake, the engine does not actually 'suck' more air in at high rpm under WOT than 80% throttle. The partially closed throttle across high rpm introduces swirl, which improves exhaust emissions compliance 
It also cuts power quite effectively to 'limit' engine power
It also cuts power quite effectively to 'limit' engine power
Well, I'm not stock anymore, and I am tuned. But I wasn't aware that the throttle was only at 80%. I'm surprised my tuner didn't notice that as I have seen him tune other cars and he noticed things like, injectors are maxed out or MAF is maxed out, so I wonder how he missed that.
Couldn't find the thread but here is a post about it:
Well, the price can be semi-justified since TS does modify other parameters too.
I have the 5.5 gen (02-03) and stated I have never seen anything re: closing as RPM’s climb. It’s actually impossible since there are 4 sensors, and they must be within a certain tolerance with respect to voltage of each other or else the car will go into limp mode.
With that said, your foot is pegged so it’s(APPS 1&2) say 4.10V, and the TPS(1&2) (actual throttle plate) are @ 4.08V, if they deviate more than that(i.e. TPS starts to close) the car will go into limp mode since your foot isn’t letting off the pedal.(voltage stays @ 4.10v)
I have the 5.5 gen (02-03) and stated I have never seen anything re: closing as RPM’s climb. It’s actually impossible since there are 4 sensors, and they must be within a certain tolerance with respect to voltage of each other or else the car will go into limp mode.
With that said, your foot is pegged so it’s(APPS 1&2) say 4.10V, and the TPS(1&2) (actual throttle plate) are @ 4.08V, if they deviate more than that(i.e. TPS starts to close) the car will go into limp mode since your foot isn’t letting off the pedal.(voltage stays @ 4.10v)
Last edited by pimpin02max; Jul 20, 2009 at 10:31 AM.
I have no clue...I know that the VIAS valve is what it is though, do you have the power valve in? Because I used to feel slowly cutting power the closer I got to fuel cut but ever since I did the SSIM/removed power valve it pulls all the way to fuel cut without any hesitation whatsoever...
I made myself a block off plate which I will install eventually, but I will need to retune I think, and I have a few more things to do as well before I retune so I only want to tune once more.
Well...after you install the block off plate you won't have that hesitation at the upper rpms any more...you should really do the full SSIM though for best results.
I am trying to find the thread but have had no luck so far. If I recall correctly though, this was disproved. Actual throttle position was datalogged and it was confirmed that the throttlebody remained at 100 percent all the way to the fuel cut.
Not lying, simply misinformed.
http://forums.maxima.org/4147176-post47.html
The difference between TS and eng92's findings is that TS measured the TPS voltage via the OBD-II port and eng92 obtained it directly from the sensor. DEBUNKED!
http://forums.maxima.org/4147176-post47.html
I connected the analog voltage input on the EU to the TPS output on the electronic throttle so I could measure the flap position directly instead of going through the OBD-II port.
Results are below. As long as the pedal was to the floor, the throttle plate never moved even after I bounced it off the rev-limiter a few times. The OBD-II data which indicates a gradual closing throughout the rpm range now makes absolutely no sense.
Results are below. As long as the pedal was to the floor, the throttle plate never moved even after I bounced it off the rev-limiter a few times. The OBD-II data which indicates a gradual closing throughout the rpm range now makes absolutely no sense.
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