TRD S/C + URD 7th Injector = ??AFR??

There are some 5VZ's that just ping... No one has quite figured it out. Try a colder plug?

Yeah, you only have to make adjustments to your AFR readings in closed loop. When you add fuel in closed loop, you have to make sure you adjust your fuel trim on the primaries as well. Otherwise the ECU will trim fuel from the primary injectors and undo what you are adding via the 7th injector.

 

I got ambitious tonight and decided to retune my engine. I got the ping down some maybe, but I can't hit the full 9.5 psi anymore. I tried a lot of different changes on both maps to try and get it, but I can't get past 6.5-7psi. On one of my old tunes I was able to hit it quite easily. That map is gone though so I don't know what I'm doing wrong now. My map is probably the best it has been aside from that.

 

I got ambitious tonight and decided to retune my engine. I got the ping down some maybe, but I can't hit the full 9.5 psi anymore. I tried a lot of different changes on both maps to try and get it, but I can't get past 6.5-7psi. On one of my old tunes I was able to hit it quite easily. That map is gone though so I don't know what I'm doing wrong now. My map is probably the best it has been aside from that.

 

Wonder what would cause you to lose boost? possible the belt slipping?

 

I considered the belt. I bought the urd tensioner pulley since the one that came with the supercharger squeaks and I have a new belt I can put on too. Other than that I guess I will need to phone gadget.

 

Not sure I would recommend the URD Tensioner pulley. I just pulled mine off and replaced it with the pulley that comes with the tensioner. I'm not sure if it has something to do with the aluminum or what, but my belt was eating away at the tensioner. With only 5k miles or so on the tensioner pulley, the belt had eat 0.070 off the pulley. Figure another 5k and it would of eaten through it. I'll post up some pics of it later today.

 

Tag.. Can one of you guys PM me a contact phone number if you don't mind answering a few backs questions... There is more info here than I can decifer... And search function is not yielding what I need to know. Thanks in advance

 

Just post them up here. None of us are experts on this stuff so we all might have some helping info. Hell, most of the stuff I know is from reading on forums so I'm not sure if it's right or wrong or indifferent.

 

any of you guys ever come across a problem when pulling data from the AIC? I managed to hook up my PC to the AIC but when I click the button in R4 to "read data from ecu" it shows a progress bar as if it is doing something but once complete, the map cells still show all zeros. not sure what i'm doing wrong?

 

Jesus I am an idiot. I didnt scroll right into where the map begins to show positive pressure

All I changed was my over pressure value to 2 so the closed loop enrichment will begin sooner. I think I am going to change it to 1 tomorrow. Anyone knows exactly how the closed loop enrichment works? I know it fakes the ecu to think its 14.7 AFR but where does the extra fuel for the enrichment come from if my map doesn't begin to add fuel until 3000 rpm @ 4 psi?

 

The AFR Calibrator is the one that tricks the AFR sensor into thinking it's reading 14.7 so that you can tune while in closed loop mode but still boosting so that you can get your actual AFR down to the 11.5-12 range.

The table you are looking at, with fuel being added at 3000 rpm @ 4 psi is the AIC/T module. But this module doesn't add fuel while in closed loop mode. Just open loop.

 

I do not have the AFR calibrator. My AIC/T has the closed loop enrichment built into it. There is a wire that taps into the O2 signal wire to the ECU (the afr sensor on toyotas older than 99 are referred to as O2 sensors and are a bit different than the newer afr sensors on the 99 and up toyotas). I was under the impression that during closed loop enrichment, once the overpressure value is reached and the closed loop enrichment is activated, the module fakes the ECU into thinking the AFR is leaner than 14.7 so the injectors add more fuel to compensate which in return richens the mixture since it really isn't going lean but the ECU thinks it is. This is why your fuel trims roll very positive when the closed loop enrichment occurs.

 

I didn't know that there was a AIC/T with the ability to manipulate AFR in closed loop. I know that when I bought mine I had to get a second module that ties in along with the AIC/T and you program them separately.

As far as how it works, i'm assuming it works the way you described. But with mine, the numbers are completely different in the cells. with the AIC/T my values are all 1.1+ which is the amount of time in milliseconds that the 7th injector is firing to help richen the mixture while in boost in open loop mode. on the AFR calibrator, 10 is a neutral number meaning it doesn't do anything, and a lower number will richen the mixture while a higher number will take fuel away. But from what i gather, this is done through the stock injectors and not through the 7th injector. basically just keeps the stock injectors from leaning out on the fuel and forces it to give them a little bit more.

I'm still working on mine trying to get it working properly and tuned in right. I thought i had it, but for some reason it seems like it's not working correctly. I'm actually going to plug into both modules tomorrow and make sure that the maps are still correct and maybe try to do a little tuning if the weather holds out.

 

Yea I wasn't aware mine had it built in either. I'm assuming I have the same AIC/T as isu2014 except mine has the O2 calibrator built in and his has the AFR calibrator built in. I almost bought the O2 calibrator from URD until Gadget told me to look at my current AIC/T and if the part number ended in D then I had the O2 calibrator already built in. Its nice to have both units all in one except I cannot tune the closed loop enrichment like you said you can. All I can do is change when it is activated by changing the "overpressure" value in the settings of the R4 software.

 

From what isu2014 said, the closed loop tuning can't be done that with that one. It's already set with the base map. You would need the O2 calibrator to actually be able to adjust the settings.

 

Yes, mine is 2 separate black boxes. I have the AIC-T and a AFR calibrator. However, they wire up as a kit so that they talk to each other and do whatever they need to do. I can only adjust the AIC-T open loop fuel and timing. My truck is usually in open loop boosting, so I've never noticed any closed loop boosting issues. I just need to find time to rebuild my injectors to rule that out, then next would be hook up the meth injection to try and fight the ping. I really need to spend some time tuning too, but I won't do that until I get the engine maintenance up to spec. I need more time!

 

Update:

I got back to North Dakota about 10 days ago and when i went to crank the truck at the airport it revved to 500-600 rpms and died. Cranked again. Same thing. 3rd time I gave it some gas as I cranked it and once it revved up a little it settled down and idled fine.

Done some research, and decided to clean the MAF to see if that helped. Took the intake, throttle body all off, and cleaned the throttle body out and cleaned the MAF and put it all back together. After a failed attempt at cranking (forgot to plug the damn coil pack back in on passenger side where i had unplugged it to give the throttle body more room to come off), it cranked up and idled fine. But once warm, it had a hesitation if you just pushed the throttle from idle or if you just completely let off the gas while driving and pushed it again. You had to roll into the throttle and it acted fine. The hesitation would cause the RPM to drop 300-400 and then it would climb back up like normal.

So this time I decided to just replace the MAF all together. Ordered up a new one, got it changed out and BOOM, cranked fine, hesitation is gone, and after driving down the road, i was getting into open loop way sooner than before and the 7th injector was kicking in like it should. Only problem I had then was that I had really turned up the injector because I thought i wasn't getting enough fuel. I had AFR's in 8-9 with only 3-5 psi of boost. Needless to say was way over fueling.

Tuned the AFR and the AIC/T back to stock and truck is running like tits again. Only kicker that got me, truck never threw a code. So in turn, check those MAF's!

 

I finally did my engine maintenance and rebuilt my injectors, and now no ping! I even switched back to the 2.2" pulley and don't ping. It runs real hard now. I'm going to start really tuning again. I'm lean at low boost (13 afr), but rich at high boost (10 afr) so I need to smooth that out to about 11.5-12 throughout.

 

Good progress.

Don't you just hate when you tune for something that you thought was just right, then it turns out that something wasn't? Quite relieving once you over come that, and really feel how it is supposed to run.

Fix those AFR's, and it will run like a dream!

Also, if your fuel filter hasn't been changed in a while, it would also help a lot to do that, since you just did the injectors.

 

I wasted so much time tuning and not getting anywhere. It was almost to the point where I would have paid someone to tune it and do whatever needed to fix the ping and save my engine. It turned to be exactly what gadget thought... Dirty injectors. $20 fix. I replaced the fuel filter a while back thinking that was it. Now I'm up the date on everything maintenance wise and the whole intake and fuel system is clean. It made all the difference.

Now the next thing to figure out is my snow performance methanol injection kit, but I have next to no experience with them so I don't know how it works, where the lines go to, or what kind of headache that will create.