Making The GX More Efficient
07-12-21, 04:38 AM
#16
Super Moderator
I asked vendor about that. He stated it was not currently up-to-date but -------> "If they don't mind sending a photo of their MAP sensor then it is super easy to for me to tell them the correct fitment. All the newer Toyota / Nissan products use Q1, Q2 or Q3 with Q3 being the majority.
460 will show up on that page up to 2015.
https://crawfordfuelsaver.com/contact-us/
460 will show up on that page up to 2015.
https://crawfordfuelsaver.com/contact-us/
Last edited by Acrad; 07-12-21 at 02:22 PM.
07-12-21, 09:01 PM
#17
The AFE air intake does the same thing. I saw my MAF readings drop by almost 2 lbs/min immediately after installing.
I asked their tech support what the deal was and got this in response:
the thing is the pcm has fuel trims for low, medium and high rpm. I kinda suspect that, after a short amount of time, the fuel trims will compensate for the spoofed MAF and bring the tune back to normal.
the other thing is I believe these engines have a MAP sensor and may use it for some things. I have looked at the 3UR tune for the Tundra in HPTuners and it seems like the MAP is used to control air load.
I asked their tech support what the deal was and got this in response:
I see...not to worry....the ECU has a failsafe built in so t you will not lean the engine out too far that it will hurt it. the engines from the factory run a little too "fat", rich when they leave the factory, We just add additional air to lean it out and make it run more fuel efficient and you get a little extra horsepower to boot.....
the other thing is I believe these engines have a MAP sensor and may use it for some things. I have looked at the 3UR tune for the Tundra in HPTuners and it seems like the MAP is used to control air load.
Last edited by skrypj; 07-12-21 at 09:39 PM.
07-13-21, 04:49 AM
#18
Super Moderator
Vendor told me this:
"there are fuel trims that are active when the ECU is running in the closed loop fueling mode, and when in the close loop mode the Fuel Saver has no effect on the air fuel ratio as the ECU will maintain a 14.7 to 1 AFR. But it will still add a little ignition timing, change the camshaft timing as well as change the shift points of the transmission. Every Load based parameter will be changed by the Fuel Saver except the AFR while in the closed loop fueling mode.
When the ECU is in the open loop fueling mode the AFR drops down to between 10.5 and 11 to 1 and no longer uses the Lambda sensors to trim the fuel. The Fuel Saver then raises the AFR to a more efficient setting which results in a more efficient running engine. Very simple and something that all us aftermarket tuners do. "
•• I will update my experience with product but vehicle isn't a daily driver so it may take a while to compile results either way.
"there are fuel trims that are active when the ECU is running in the closed loop fueling mode, and when in the close loop mode the Fuel Saver has no effect on the air fuel ratio as the ECU will maintain a 14.7 to 1 AFR. But it will still add a little ignition timing, change the camshaft timing as well as change the shift points of the transmission. Every Load based parameter will be changed by the Fuel Saver except the AFR while in the closed loop fueling mode.
When the ECU is in the open loop fueling mode the AFR drops down to between 10.5 and 11 to 1 and no longer uses the Lambda sensors to trim the fuel. The Fuel Saver then raises the AFR to a more efficient setting which results in a more efficient running engine. Very simple and something that all us aftermarket tuners do. "
•• I will update my experience with product but vehicle isn't a daily driver so it may take a while to compile results either way.
07-13-21, 12:00 PM
#19
Originally Posted by Acrad;[url=tel:11085903
11085903[/url]]Vendor told me this:
"there are fuel trims that are active when the ECU is running in the closed loop fueling mode, and when in the close loop mode the Fuel Saver has no effect on the air fuel ratio as the ECU will maintain a 14.7 to 1 AFR. But it will still add a little ignition timing, change the camshaft timing as well as change the shift points of the transmission. Every Load based parameter will be changed by the Fuel Saver except the AFR while in the closed loop fueling mode.
When the ECU is in the open loop fueling mode the AFR drops down to between 10.5 and 11 to 1 and no longer uses the Lambda sensors to trim the fuel. The Fuel Saver then raises the AFR to a more efficient setting which results in a more efficient running engine. Very simple and something that all us aftermarket tuners do. "
•• I will update my experience with product but vehicle isn't a daily driver so it may take a while to compile results either way.
"there are fuel trims that are active when the ECU is running in the closed loop fueling mode, and when in the close loop mode the Fuel Saver has no effect on the air fuel ratio as the ECU will maintain a 14.7 to 1 AFR. But it will still add a little ignition timing, change the camshaft timing as well as change the shift points of the transmission. Every Load based parameter will be changed by the Fuel Saver except the AFR while in the closed loop fueling mode.
When the ECU is in the open loop fueling mode the AFR drops down to between 10.5 and 11 to 1 and no longer uses the Lambda sensors to trim the fuel. The Fuel Saver then raises the AFR to a more efficient setting which results in a more efficient running engine. Very simple and something that all us aftermarket tuners do. "
•• I will update my experience with product but vehicle isn't a daily driver so it may take a while to compile results either way.
in closed loop mode is the PCM relying on the MAP sensor to dictate power? My F150 ecoboost has no MAF sensor at all. Its “speed density” tuned meaning the pcm runs the truck based on the MAP sensor, the AFR via factory wideband O2 sensors, and then a bunch of equations that predict the volumetric efficiency of the motor based on dyno testing.
07-13-21, 12:27 PM
#20
Super Moderator
I believe from what I read more aggressive driving and of course WOT would benefit the most as apparently this usually takes engine into Open Loop. I guess I need to figure out some parameters to track between open and closed loop. I've never had a need to do that before.
My pass travels with trailer may put me into that area. I'm trying to keep an open mind about it until proven yeah or nay.
I guess with my OBD Link I could just watch "Air-Fuel Ratio" under Engine and AT and while around 14.7 this would tell me close loop for the most part?
My pass travels with trailer may put me into that area. I'm trying to keep an open mind about it until proven yeah or nay.
I guess with my OBD Link I could just watch "Air-Fuel Ratio" under Engine and AT and while around 14.7 this would tell me close loop for the most part?
Last edited by Acrad; 07-13-21 at 12:43 PM.
10-21-21, 10:43 AM
#21
Driver School Candidate
Recommendations for Gas Saving device - '18 GX460
I am looking online for Gas saving devices - most of the website seem shady and unreliable. I feel the amazon reviews are fake with some of them. Looking for real recommendations from my community here that have successfully installed a gas saving device.
Thanks!
Thanks!
10-21-21, 11:12 AM
#22
Pole Position
No black magic available ... or Lexus would have integrated.
10-21-21, 11:15 AM
#23
Intermediate
10-21-21, 12:53 PM
#25
Your willingness to change your driving style will be the largest contributor to better gas mileage. Something like a scan guage can help with your awareness. You can also inflate the tires a little higher than OE recommendations.
10-21-21, 05:58 PM
#27
Driving style will be your best way to save fuel. I suppose you could get a pedal commander and use their eco setting to help with that but in all reality there just isn’t anything to do because Toyota is hyper focused on fuel economy anyway so it’s about as efficient as it will get.
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Piney1 (10-22-21)
10-22-21, 12:02 PM
#28
Trade if for a Highlander Hybrid? Nearly identical in size for the same year Highlander and a ton better mpg but no real rugged stuff possible.
11-12-21, 05:26 PM
#30
Intermediate