URD 7th injector kit

Yeah I've read a lot about it both before and after having it installed...it seems that the most common complaint it's only relevant in open loop when much of the time we're driving is spent in closed. My primary issue with my s/c setup though was with what I was experiencing in open loop and it's helped a great deal there. Was it worth the cost? To me it was, at least right now...coming from where I was prior to it, it's like driving a new truck. After I get used to it I'm sure I'll start to notice some of the characteristics that are still lacking but for now...

 

how hard was the install?

 

Had a local member here with a shop do it for me, I'm not mechanically inclined enough to give something like that a go with any sort of confidence lol. It was done in about 6 hours, the whole kit (injector install +wiring, fuel pump replacement and spark plugs). Top notch work too @glorifiedwelder

 

I think I had closer to 7.5-8 hours into it, but I like to round down for my customers. It's a pretty straight forward install. Dropping the tanks was the biggest part of the job (still very easy) and I spent some extra time mounting the urd injector/timing controller. I wasn't a huge fan of urd's suggested locations. I also tried to hide as much of the wiring as possible. If you hammered thru it you could be done in 4-5 hours.

 

The URD AIC/Timing unit that drives the 7th injector and retards the timing can provide closed loop enrichment. It's a built in feature that was added a few years back I believe. There's a setting in the R4 software called over pressure. You set what psi you want it to kick in. I set mine at 1 psi. So at 1 psi (closed loop) my afr begins to drop and the STFT rolls very positive. The URD unit tricks my ECU to believe the AFR is 14.7 but it's actually adding fuel by skewing the MAF signal. My 7th doesn't kick in until 4 psi and 3,000 rpm. This all works out great. It even lists this feature on their website.

 

I've always installed pumps by unbolting the bed and propping the left side up with a jack stand. Last one I did took only 1.5 hours this way. That included shortening the hard line to fit the pump in place of the stocker.

 

I could have done it that way, but I have two four post lifts so tilting the tank from the bottom isn't bad at all. And it's an easy one man job

 

Nice That's beyond my shade tree work.

 

Any changes you think are being made in CL will be trimmed out. This is the primary function of LTFT. Unless you have a device which can alter o2 sensor voltages you can not tune CL.

 

As I said, the URD unit has a function that tricks the ECU to think the AFR is normal in closed loop when it's actually adding fuel. This is so the ECU won't trim out the extra fuel as you mentioned above. It taps into the O2 sensor wire and MAF IIRC. I asked gadget if I needed the O2 sensor calibrator to tune closed loop because I thought I couldn't do this with my 7th injector unit. But he said the units now have this function built in. It's not as tunable as some of the other units on the market, but you just tell it when to kick in and it begins to lower the afr at that point. Works fine for me. It provides a smooth transition to open loop.

 

I'd like for you to show me in the install directions of this new model where it says it can alter o2 voltages because in the instructions I had with my 2014 model it explicitly states there is no closed loop tuning ability. The o2 intercept is merely to log afr's it does not have a skewing function.

 

Let me go grab my instructions and see what it says. This is stated on their website.

 

I'm don't think there is any such component. If there were it wouldn't be a boost enrichment module it would be the afr simulator they sell separately. I think they are just referring to the ability to add fuel based on boost which can technically enrich CL however without an o2 skewing device the fuel trims will do what they were designed to do and over time you will be back to 14.7:1 afr.

I don't mean to be insistent, the kit is not a horrible product by any means. I personally would recommend a fic6 and larger primary injectors for 95% of applications.

 

It is essentially the afr/o2 calibrator but it is built in. And it does skew the o2. I'm sure you're familiar with Speedy and his website on Superchargering his 4Runner. Lots of good information on his site. See below



There are 7th injector kits with AIC-T units that cannot provide closed loop enrichment. It all depends on what you got when you ordered the kit. I don't even remember this option but I ended up figuring out I had it built in when I was asking Gadget about the O2 simulator.

And I agree there are better options out on the market. Each have their pros and cons. But the AIC-T can provide closed loop enrichment if the afr/o2 calibrator module is built in. I believe they now all come standard this way unless you specify. Could be wrong though.

 

I see. I didn't know that was an option. That is a much more complete solution for the SC's short comings IMO. My original impression was you needed the $900 7th kit and the $200 o2 simulator in order to cover all bases. Granted you may be paying a little more for this additional option(?) still it's a very nice addition to the product since it's integrated into the existing unit. Thank you for that information.

 

No problem man. I don't think too many people know its an option, or that they even have it if they do. I thought the same thing after I got my kit. Thought I needed to drop another 200$ for the o2 calibrator. Good thing I called gadget first. There's really no good information on how to use it when it's built in. Don't even think it's mentioned in the instructions anywhere. There's a setting called over pressure and you just go in and change at what psi you want the enrichment to start. Funny they don't advertise this more because I'm sure some people stray away from the 7th because they think it cannot provide closed loop enrichment.

 

Good reads here.

 

how can you tell if the URD kit has this feature built in or not? i am in the process of obtaining a supercharger and the URD 7th injector kit and would like to know how to determine if the URD kit i am getting has this capability.

 

You could look at the part number on back the unit and call URD and ask them.

Or when you get it check the over pressure set point in the R4 software settings. Set it to 1-2 psi. Watch your afr when you hit this boost pressure and see if it starts to drop.

 

ok bringing this back again.

recently aquired a new supercharger and deciding on what route to take for fuel mods.

I am in Hawaii at sea level and read that the meth injection is not enough at sea level.

for now i plan to just run the supercharger with the stock pulley.

anyway i really want the ability to tune closed loop cause most of the driving i do is the 95%. after reading these posts it seems that the newer 7th inmjector kits can help with closed loop tuning a little bit according to the project sportrunner findings the best that he could get the AFR at closed loop was 13.5 where ideally it needs to be at 11.8 (correct me if im wrong).

anyway what would be the BEST option for closed loop tuning when installing the supercharger system.

last thing is i have a 2004 DC 4x4 that has the different style of cruise control system that the previous year models did not have. I read somewhere that someone had to do something different to maintain the useability of the cruise control on their 2004 when installing their supercharger. can anyone chime in on this?

thanks all for the help.