[bishopts]

Your fuel trim is more than likely hitting it's max correction on the throttle snap. It's pretty normal to do that on sudden throttle changes. If you go the other way by pulling your foot off the gas suddenly you will see it snap to 0 for a second or two.
There is a buffer zone built into the tune to keep it from actually trying to adjust for those sudden changes. If it didn't then it would run all sloppy by pretty much trying to chase it's own corrections.

The fuel trims have limits to keep it from adjusting fuel so far that it cant even run. Usually if your at the limit for about 10 seconds it will set a code for fuel trim Being beyond a controllable value and then put fuel adjustment to a default value and set an engine light. Pretty much to get you home .

Do you have the ability to look at historical misfires? It might help to see if you have a cylinder on bank 2 that has a few more than the rest of them.

[vince3]

Here is my post on HPtuners. It’s the opposite, bank 1 has more misfires but I’ve been told this amount is normal.

https://forum.hptuners.com/showthrea...ndom-cylinders

[bishopts]

Very strange. The numbers aren't really bad. Like in said, the fuel trims are still within spec just left and right are not the same as each other. Could even be the o2 sensor is just slightly off compared to the other side. I think they are the same part number but I'm not 100 percent. If they are you could just swap sensors and see if the slightly rich trim follows it.

[bishopts]

Maybe get a couple good pulls data logged and send them to your tuner.

[vince3]

I'm planning on replacing both front o2s because i think one is lazy. I also want clean data so i'm just going to replace them. Then smoke test the exhaust. The video below explains why an exhaust leak before the o2 could cause it to run rich. Thanks for looking and helping trying to troubleshoot it. Starting at 16:00 to 17:00 for the exhaust leak.

[bishopts]

He goes over it but i dont think you caught what he was saying fully.
Fuel trim is fuel correction.
In between the 16 to 17 min section he talks about air entering the exhaust and the o2 sensor picking it up as excessive air, which will be seen in the fuel trim as Lean.
Here is the part you didn't quite catch.
Now that the o2 has reported the exhaust having extra oxygen, the actual adjustment the computer does is Add fuel because based on the sampling it Thinks it should. So the computer forces the fueling to go rich.
So at that point the exhaust sample will be good based on o2 readings but the actual burn will be rich.
So when he said "it would actually make the engine run rich" he means the engine truly will be running rich, not the fuel trims will be showing rich.
Hopefully i explained it better for you.

[vince3]

I didn’t install the headers and I bought them used. There is a chance that the place who installed them used the old o2 sensors that were left on the headers. I think I hear a slight exhaust leak so I want to rule that out too. I ran some more logs with individual injectors and they are all close.

Still not sure on the knock, it might be something mechanical or I’m wonder if an out of balance tire could cause false knock.

[bishopts]

Fuel quality can cause a ping which will be registered as a knock. Like bad batch of fuel kinda of quality. But it could also need the timing adjusted slightly in that load range. That's why i was saying get a few data logs and run it by your tuner. He could probably spot something that we aren't seeing.

[Blackmonba6Gen]

Originally Posted by vince3

Yep you are right next to me on the dragy leaderboard. My DA probably helps at least half a second vs your DA. I went and weighed my car at the same type of weight station after watching your video. I'm at 3560lbs with 1/2 a tank of e85.

Damn that’s motivation to me! At least i know what to look for! I still haven’t dyno it yet with my latest mods and ran good gas in it to compare with 93 and E85. We’ll see as the time comes before I switch the setup to get lighter

[vince3]

Ordered forgestar D5s. Just trying to decide on which tires. Do I go drag radials for a 60-130 pull or go with something that will be better for daily driving. I got 17x10 for the rear and 18x8 for the front.

Bought the paid version of chatgtp and uploaded my data logs. It’s convinced you want a degree timing less for the MSD and possibly another for my climate at sea level.

[vince3]

A couple of vendors have Forgestars on sale for 20 percent off and free shipping right now. The front 18x8 weighed 20.8lbs on the scale and I’m waiting on the rears. I’ve read mixed weights on stock wheels, some say 30lbs, others say 32lbs for the painted black ones.

[Blackmonba6Gen]

Originally Posted by vince3

A couple of vendors have Forgestars on sale for 20 percent off and free shipping right now. The front 18x8 weighed 20.8lbs on the scale and I’m waiting on the rears. I’ve read mixed weights on stock wheels, some say 30lbs, others say 32lbs for the painted black ones.

Stock wheels is around 30-32lbs for sure. As for tires if you daily drive your car or use your car to and from track days 555R2 is the best tire for that and it grips pretty good! I enjoyed that tire. I sold my rear drag pack because i was still getting the same amount of times with my track wheels and drag pack so I didn't see the value anymore.

[vince3]

Originally Posted by Blackmonba6Gen

Stock wheels is around 30-32lbs for sure. As for tires if you daily drive your car or use your car to and from track days 555R2 is the best tire for that and it grips pretty good! I enjoyed that tire. I sold my rear drag pack because i was still getting the same amount of times with my track wheels and drag pack so I didn't see the value anymore.

The NT555rII is what I'm leaning towards, but I do daily drive it, and we get a decent amount of rain here. Since we don't have a 1/4 mile track, I'm hesitant to get them for that reason. It's the Nitto Drs or a summer tire that won't spin for my 60-130 pulls.

What track tires did you have? The ones I've seen that hook (hypers low 11 second pass with 1.6 sixty foot with a manual) are the MT ET Street R, but no way I would daily those.

[Blackmonba6Gen]

Originally Posted by vince3

The NT555rII is what I'm leaning towards, but I do daily drive it, and we get a decent amount of rain here. Since we don't have a 1/4 mile track, I'm hesitant to get them for that reason. It's the Nitto Drs or a summer tire that won't spin for my 60-130 pulls.

What track tires did you have? The ones I've seen that hook (hypers low 11 second pass with 1.6 sixty foot with a manual) are the MT ET Street R, but no way I would daily those.

The NT555R2 is why i recommended them. I used them on my setup and they worked good when i rained here and it hooks well in first gear! My favorite tire so far. If i wanted a 1/4 dedicated setup i would go with MT's or Hoosiers for sure. For the street R2s is perfect