Well, I again tried to take my car to the dyno with no conclusive results. My tuner is fairly new to the whole tuning with Emanage Ultimate; however, he's a very competent tuner. In any case, we were on there and he had the probe in the tailpipe and upon getting a really good idle tune and partial tune to about 3-4 K, the problem came when trying to tune WOT. When I got on it and the boost kicked in, it would spike to 19 afrs so we'd shut it down.

He is saying that one possible problem may be the welding job. It was my first attempt at welding and there were some pinholes and he is saying that as the exhaust is shooting out, it's drawing in some air from around the hole thus leaning out the mixture going to the probe. I now need to weld on another O2 bung by the turbo on the downpipe to see if this is accurate.

Another person was questioning if the Ultimate is fighting with the stock ECU making them lean out; however, the fuel pressure remains constant at 55 psi and when my tuner added more fuel, the tq shot up to around 150 ft/lbs at around 3-4 K right before I shut it down.

Anyways, I'm a bit stumped but it sounds like the leaning out is caused by the pinholes, but if anyone else can offer any other advice, that ould be awesome!

Cheers.

 

Sounds logical to me, weld another bung.

 

Umm what injectors are you running? and what boost?

 

Injectors are 675 and the wastegate is set to around 5 psi, but when screwed in goes to around 7. Like I said though, when I got on it, he told me to shut it down because it spiked to 19:1 afrs, and this was at around 3 or 4 K. On a different note, it began to climb to around 150 ft/lbs of tq haha

 

I forgot to ask, did you hear the car pinging? Do you have a knock sensor?



I seriously doubt you went to 19 without hearing it, as a quick fix puddy some JB weld around that bung, and try again.

 

Didn't hear anything pinging, however, I wasn't on the throttle for very long until he told me to shut it down. Again, he's saying that the pin holes in the welding are drawing air in and as the exhaust gasses exit and hit the probe that's in the tail pipe, it's reading much of that air causing a lean status. He also said that he put the fuel to 100 or something (not too sure what that means) and it did the same thing. I don't know much about how the tuning goes, but this does sound logical to me so I'll have to have that bung welded on for his O2 sensor just so it does not draw in extra air.

 

Its an issue with the sniffer and our exhaust not your actual afr. I've been in the same boat before. You wont get an accurate WOT afr measurment with a sniffer, you need to have him hook up his 02 sensor to where you hook up yours for your wideband just after the header, this is assuming you have one, if you dont then you need to get one, at the very least you need a bung welded in for a hook up and just cap it off with a bolt when driving.

 

to OP, do you have a single exhaust or dual?

Like Junky said, if you still running dual, its much more accurate to take the AFR from the header/CAT area. I ran into this when I dyno'd the first time.

If your dyno shop only put the senor up to your exhaust, at least get down there and take a look, I would put the sensor on the side where its a single unit from the CAT back, instead of the other side where you have to bolt on to rest of your exhaust system.

 

Did not know that about this car, thank you!

 

AP1 or AP2?