exciting news from urdusa
by gman » Mon Sep 19, 2005 5:53 pm
A buddy of mine sent me this from Gadget at URD and man it sounds good. Hopefully the price will be attractive. This will greatly increase throttle response and give some extra power a few seconds earlier. See what you think......My question was
Hello Gadget,
I was told you are the resident guru on Toyotas. When you can find the time, can you tell me what the variables are that determine when the ecu goes from closed loop to open loop? For example is it the throttle position switch and maf, is it load % which you can read off some obdII tools. Any help you can supply would be great!! I am trying to figure out why my car takes so long go into open loop on part throttle at 2-3 pounds of boost.
And his response.....
Generally it is throttle position, full throttle usually gets you instant open loop.
The engine starts in open loop and when you decelerate from engines speeds above 1500 with the throttle closed it will go into open loop fuel cut and will go back into closed loop when it gets a clean signal from the O2 sensor.
The rest is load related. The calibration is different for every car and it is for keeping the cats from melting down. It can be time/load related. This calibration is from extensive calibration testing monitoring the cat temps. In normal operation you will never feel any difference, but when you strap on an aftermarket supercharger it whacks this calibration way out of whack. It is now making more power with much less throttle and you can smoke up the cats from excessive temps and it is not real good for the engine either.
So, how do we fatten up the mix earlier?? URD has been very hard at work on this and we have had some fantastic brake through. On the older vehicles equipped with O2 sensors we used the ESC gadget from Split Second to force the ECU to stop trimming fuel in boost, but this did not work on the newer vehicles with the air/fuel ratio sensors.
We have now developed a device that interfaces with the new air/fuel ratio sensors and it allows us to precisely map the AFR in closed loop. We can make it ANYTHING we want in closed loop. Like I said this is a real brake through. We have about finished out R&D and testing the production prototype units and should have them for sale very soon.
You will need to use it in conjunction with a MAF signal calibrator like our PCU/FTC boxes, AFC or so on.
Now here is the kicker. It seems that when we lean out the mix a tad in light load conditions, MPG takes a jump up. We are seeing a 2-3 MPG increase with this.
Stay tuned and keep checking the URD site for an announcement very soon.
Gadget
Hello Gadget,
I was told you are the resident guru on Toyotas. When you can find the time, can you tell me what the variables are that determine when the ecu goes from closed loop to open loop? For example is it the throttle position switch and maf, is it load % which you can read off some obdII tools. Any help you can supply would be great!! I am trying to figure out why my car takes so long go into open loop on part throttle at 2-3 pounds of boost.
And his response.....
Generally it is throttle position, full throttle usually gets you instant open loop.
The engine starts in open loop and when you decelerate from engines speeds above 1500 with the throttle closed it will go into open loop fuel cut and will go back into closed loop when it gets a clean signal from the O2 sensor.
The rest is load related. The calibration is different for every car and it is for keeping the cats from melting down. It can be time/load related. This calibration is from extensive calibration testing monitoring the cat temps. In normal operation you will never feel any difference, but when you strap on an aftermarket supercharger it whacks this calibration way out of whack. It is now making more power with much less throttle and you can smoke up the cats from excessive temps and it is not real good for the engine either.
So, how do we fatten up the mix earlier?? URD has been very hard at work on this and we have had some fantastic brake through. On the older vehicles equipped with O2 sensors we used the ESC gadget from Split Second to force the ECU to stop trimming fuel in boost, but this did not work on the newer vehicles with the air/fuel ratio sensors.
We have now developed a device that interfaces with the new air/fuel ratio sensors and it allows us to precisely map the AFR in closed loop. We can make it ANYTHING we want in closed loop. Like I said this is a real brake through. We have about finished out R&D and testing the production prototype units and should have them for sale very soon.
You will need to use it in conjunction with a MAF signal calibrator like our PCU/FTC boxes, AFC or so on.
Now here is the kicker. It seems that when we lean out the mix a tad in light load conditions, MPG takes a jump up. We are seeing a 2-3 MPG increase with this.
Stay tuned and keep checking the URD site for an announcement very soon.
Gadget
Grey Menace
- gman
- Regular SolaraGuy Member
- Posts: 205
- Joined: Mon Feb 21, 2005 1:43 pm
- Location: RI
