Help reading Dino sheet

[omarestrada599]

2015 camaro SS L99 conv. k&N CAI, Vmax Tb, AR Lts catless flow master mufflers, tune.
Some other shop told me I was running lean and had a knock at 4500 rpm. About to do flex fuel, Phastek intake scoop and possibly 160 degree thermostat and new tune for flex.

[omarestrada599]

bump

[Clarkstar]

Did they tune it after the header install???

I don't understand what your asking...

[omarestrada599]

yes the car got tuned after all bolt ons (headers too), and at the tune a dino was made.
at some other shop I was told that I had a knock at 4300rpm and that could hurt the car, the other shop also said I was running lean so not a good idea to run it hard.
I have the dsx flex fuel kit and this other shop charges $980 to install and program to the car, I also have a 160 degree thermostat that I would like to tune to the car which can possibly cost some more money to get it tuned.
I don't know if to take my car to the shop where I got it tuned first or to have it tuned at this other shop.

[Clarkstar]

Originally Posted by omarestrada599

yes the car got tuned after all bolt ons (headers too), and at the tune a dino was made.
at some other shop I was told that I had a knock at 4300rpm and that could hurt the car, the other shop also said I was running lean so not a good idea to run it hard.
I have the dsx flex fuel kit and this other shop charges $980 to install and program to the car, I also have a 160 degree thermostat that I would like to tune to the car which can possibly cost some more money to get it tuned.
I don't know if to take my car to the shop where I got it tuned first or to have it tuned at this other shop.

Flex fuel/ e85 is pretty tricky to tune. If these guys can't tune your car correctly to begin with, your gonna be in for some struggles with e85.

Put the thermostat on yourself.... 2 bolts, very simple. Then I'd look for a tuner who has experience with flexfuel/e85...

[omarestrada599]

yes this other shop that I mention is pretty knowledgeable with e85, I just see it kinda pricey of $980 for the e85 tune and 3 pulls.
yes i can install the stat my self and even completely install the flex kit and save installation on it.
looking at my dino sheet could you tell me why I have that drop at 4300rmp?if im running lean?

[bkevind]

If it's knock then timing will be reduced to stop the knock, which results in less power.

Not sure that's the case, but you should be able to log that.

[Clarkstar]

Originally Posted by omarestrada599

yes this other shop that I mention is pretty knowledgeable with e85, I just see it kinda pricey of $980 for the e85 tune and 3 pulls.
yes i can install the stat my self and even completely install the flex kit and save installation on it.
looking at my dino sheet could you tell me why I have that drop at 4300rmp?if im running lean?

I'd first check for an exhaust leak...
Change your plugs...

[omarestrada599]

the shop that did the dino said it was a rattle on the exhaust and the other shop did a free log on the car and said that rattles on the exhaust don't cause a knock. I replaced the plugs two months ago and the car its not driven much. it has the ngk tr55. how's the AFR at 13.68?

[Clarkstar]

Originally Posted by omarestrada599

the shop that did the dino said it was a rattle on the exhaust and the other shop did a free log on the car and said that rattles on the exhaust don't cause a knock. I replaced the plugs two months ago and the car its not driven much. it has the ngk tr55. how's the AFR at 13.68?

It should be closer to 12.5 at wot... I'd first make sure you don't have a leak. 90% of the time that's the problem. If there's no leaks, you need a better tune. Your graph is too lean dude...

[Pro-tuned]

Not all E85 blends are the same. Convert to Lambda and put the puppy to sleep.

[omarestrada599]

I might take the car to this other shop than, since you and they agree on that Im running lean.
I haven't done the e85 conversion yet, I know that e85 is not the same throughout the year. but lambda and afr its hard to comprehend for someone that's not familiar with tuning.

[Badbubba]

Replied in your narrow band thread, hope it clarifies somethings for you, then saw this one. Exhaust rattle could pull timing. Iirc, the stock tune would pull timing around this rpm. I think it was due to torque management in the tune. Perhaps they didn't tune correctly. Although, this may have been for an LS3 and not an L99. Also, any exhaust leaks may introduce air into the system, causing a leaner afr. I wouldn't be happy with that afr unless they installed new plugs, did a full pull, turned off the engine and read the plugs. They would need to log the run to see if timing was being pulled. You should get more than 3 pulls. They need to install the flex fuel and take however long it takes to tune it correctly. Had flex fuel added to my WRX STI a few months ago. The new shop will need to do 2 tunes, 1 for 91 or 93 octane, then 1 for E85. Make sure your E85 is the summer blend, it will be around E80-85. That way they are tuning for E85. If it is winter blend, it could be E50. Yes, E85 varies from 50% ethanol to 85% ethanol. You can pick up a cheap device to measure the ethanol content of fuel. It's a small vial that you add a certain amount of water and fuel, shake it up and let it settle. Then read the graduated markings on the bottle for content. Go in for the tune with under 1/4 of 91 or 93 octane gas in the tank. Let them dyno tune it, then fill it up with E85 for that tune. I took fuel cans filled with E85, so I didn't have to drive it anywhere to fill it up. Could be charged for a hooking back up to the dyno. Be certain your fuel system can handle E85. It requires about 30% more fuel. So possibly a BAP or higher capacity fuel pump and injectors. $980 is in the ballpark. E85 will not net you big gains in a slightly modded naturally aspirated car.

[acammer]

Originally Posted by omarestrada599

2015 camaro SS L99 conv. k&N CAI, Vmax Tb, AR Lts catless flow master mufflers, tune.
Some other shop told me I was running lean and had a knock at 4500 rpm. About to do flex fuel, Phastek intake scoop and possibly 160 degree thermostat and new tune for flex.

This looks pretty awful to me. If that's a good AFR read and it's really that lean I'm not surprised it's got some spark knock. The dip at 4300 looks like where it yanks a bunch of timing (that's peak torque, highest cylinder pressures, and where it's most likely to knock), and it may have been pulling some even before there. Once it hits that big dip then it never really rolls it back in, the whole curve looks lazy and jumpy from there (probably the knock sensor doing it's best to keep the motor together), and your peak power number supports that, I think 360whp SAE is a little low for those mods with an L99.

It does look like a hot day too and there is a heavy correction factor (1.19) on this, so I'm sure it drives even worse as the uncorrected peak was only 303whp.

I think you've got some good next mods planned - they need to include tuning by a shop that will not accept results like this as ok. Ideal AFR differs from engine to engine, but a good rule of thumb for these cars is that they are usually happiest around a 12.6-12.9:1. Your car is a long ways off of there. It wouldn't surprise me to see it pick up 15-20whp (and a much smoother curve) with appropriate tuning just as it sits now.

Let us know how you make out.