I'm doing some homework on the TRD superchargers and have a couple of questions I haven't see addressed exactly. My next call is to URD, but thought I'd flaunt my ignorance here first. :-P

1) If using the URD fuel/timing control, are there any issues with tuning when driving to different elevations? Say I'm living at sea level and want to drive to the mountains - an elevation gain of maybe 8,000 feet. Will I get AFR problems, or does the system compensate like with the stock system? Would I need a separate map to load to handle higher elevations?

2) I have a 2002 4Runner with the wideband O2 sensor. Do I need a separate wideband sensor installed into the exhaust for tuning purposes? Or can I tune with just the existing sensor connected and plugged in?

Thanks much!

MadCityRich

 

I believe once you get both the map tables calibrated, the compensations will be made for elevation. The manifold pressures will be relative to the differences in a normally aspriated motor at elevation changes so you shouldn't see any differences.

Since you have a 2002 with the newer style Oxygen sensor, do you have the correct URD MAF/Timing Calibrator?

 

I don't have any URD or supercharger equipment yet. I'm just gathering background information.

MadCityRich

 

The SplitSecond FTC-1 has an MAP sensor (manifold absolute pressure) in it which you hook up when you install the kit. It measures the absolute pressure of the air outside, so it can automatically adjust for changes in elevation, and hi/low pressure systems.

You'll have to get a second AFR sensor for the purposes of tuning. I chose to have a permanently installed one so that I can keep an eye on my AFR's all the time, but some people prefer the LM-1 or LM-2 (new version of the LM-1) because it's easily removed.

I have the LC-1/XD-16 combo, which I'm not seeing on URD's site at the moment so here is the combo at Innovate's site, I think the combo when I bought it from URD was about $350: http://www.innovatemotorsports.com/x...cat=262&page=1

LM-2: http://www.urdusa.com/product_info.p..._id=1260518707

If you want to read more about superchargers and their tuning, I recommend you read these pages:

TRD Supercharger Wiki
Piggyback Fuel/Timing Calibrators Wiki
Oxygen Sensor Calibrators Wiki

 

On the note of tuning, you'll also want to get an AFR Sensor Calibrator from URD to make sure you can put in more fuel when you are runnig under boost. It's pretty much a required part for tuning in closed-loop.

 

All you need is the URD 7th kit and be sure to add the AFR calibrator to it. The ECU will adjust like normal for differnt alltuides and your AFR's will be taken care of.