[jdsfly]

You're losing a lot of torque multiplication by launching in second gear, rather than first. You have a 4.70 first gear ratio and a 2.99 second. You said you can launch at 2500 in second. What happens at 2500? Do you spin tires or does your torque converter stall? What RPM can you launch at in first, before tire spin is an issue? When you spin do you have any wheel hop?
Most guys running a 2015+ Ecoboost Mustang automatic, that are in the high 11s, are launching in first gear and running 1.60s in the 60 ft. Launching in second gear was worth a try, but it doesn't seem to be working for you. Your running 1.80s in the 60 ft. At this point, improving your launch and lowering your 60 ft time is probably the cheapest way to get in the 11s.

 

[Coyote Chaser]

You're losing a lot of torque multiplication by launching in second gear, rather than first. You have a 4.70 first gear ratio and a 2.99 second. You said you can launch at 2500 in second. What happens at 2500? Do you spin tires or does your torque converter stall? What RPM can you launch at in first, before tire spin is an issue? When you spin do you have any wheel hop?
Most guys running a 2015+ Ecoboost Mustang automatic, that are in the high 11s, are launching in first gear and running 1.60s in the 60 ft. Launching in second gear was worth a try, but it doesn't seem to be working for you. Your running 1.80s in the 60 ft. At this point, improving your launch and lowering your 60 ft time is probably the cheapest way to get in the 11s.

In 1st gear, I push though the lights, at 1800 RPM, while in negative boost. In 2nd gear, I can hold 2500 RPM and launch with positive boost.
But, what I can't explain, is when going through the traps, at the end of the 1/4 mile is when launching in 1st gear, I'm in 7th gear and flat, (without acceleration). But when launching in 2nd gear, I go through the traps in 6th gear, while still accelerating.

PS: With drag radials and a proper tire warming, I get zero wheel spin and no wheel hop.

 

[jdsfly]

You're only the second Ecostang owner I've heard complain about pushing through the lights on drag radials. The other one was a buddy of mine, with a 16' A6 premium, with a killer stereo, that weighed 3,800+ lbs, with a few gallons of gas and no driver. Unfortunately, he didn't stick with the drag radials long enough to sort out the problem. He ran 12.20s, on the stock 235/50/18 all seasons, with a Tune+ E30 tune and wastegate actuator, air filter, and big intercooler, nothing else. He ran consistent 1.70s on his stock tires. He's a really good driver and mostly runs the 1/8 mile, because that's his closest track, and the 1/8 mile really plays to the Ecostang's strengths, with the stock turbo. He decided to keep the car really stock appearing and stick with the stock wheels and tires. Also, his car dynoed at 377/455. After several hundred 1/8 mile passes and around 120,000 miles, he ecoboomed.
He's since added an EMS block and bigger turbo and is in the process of getting that sorted out. To be continued.

 

[jdsfly]

In 1st gear, I push though the lights, at 1800 RPM, while in negative boost. In 2nd gear, I can hold 2500 RPM and launch with positive boost.
But, what I can't explain, is when going through the traps, at the end of the 1/4 mile is when launching in 1st gear, I'm in 7th gear and flat, (without acceleration). But when launching in 2nd gear, I go through the traps in 6th gear, while still accelerating.

PS: With drag radials and a proper tire warming, I get zero wheel spin and no wheel hop.

I've thought about your situation more and think you'll need at least 112mph and a 1.6xx 60ft, to see an 11.9, but let's get into your issues.
1. Are you saying that in second gear, above 2500rpm you push through the lights also, or are you spinning or stalling the converter?
2. Have you had a trans tune?
3. Are you running the stock converter?
4. Are you auto shifting or manual shifting?
5. What RPM are you shifting at?

 

[Coyote Chaser]

I've thought about your situation more and think you'll need at least 112mph and a 1.6xx 60ft, to see an 11.9, but let's get into your issues.
1. Are you saying that in second gear, above 2500rpm you push through the lights also, or are you spinning or stalling the converter?
2. Have you had a trans tune?
3. Are you running the stock converter?
4. Are you auto shifting or manual shifting?
5. What RPM are you shifting at?

Thanks! I mostly push through in 1st gear, trying to cut a good light, the foot brake class I run qualifies on reaction time. 2500 RPM in 2nd gear is pretty easy to hold. The 10R80 transmission is stock, but tuned, torque converter is stock. When launching in 2nd, I shift manually at 6000 RPM.

 

[jdsfly]

What happens, on a second gear launch, if you try to go above 2500?
Did you see any improvement in manual shifting, from the trans tune?
Are you still using the stock turbo?

 

[Coyote Chaser]

What happens, on a second gear launch, if you try to go above 2500?
Did you see any improvement in manual shifting, from the trans tune?
Are you still using the stock turbo?

2nd gear has a lot of forgiveness, I really have to push on it hard to push through the lights.
My personal best ET of 12.35 is with a 2nd gear launch and manual shifting, I've never gotten below 12.50 with a 1st gear launch and auto shifting.
All current data is with stock turbocharger, I'm scheduled for testing with the new turbocharger in March.

 

[jdsfly]

Shifting at 6000 is a little high, for the stock turbo, head, and cams. I'd try 5700. Is the manual shifting improved, with the trans tune. Mine sucks at WOT manual shifting. It's fine partial throttle, but at WOT there's a big delay between pressing the paddle and the shift actually occurring. It makes it impossible to capture a specific shift RPM.

 

[Coyote Chaser]

Shifting at 6000 is a little high, for the stock turbo, head, and cams. I'd try 5700. Is the manual shifting improved, with the trans tune. Mine sucks at WOT manual shifting. It's fine partial throttle, but at WOT there's a big delay between pressing the paddle and the shift actually occurring. It makes it impossible to capture a specific shift RPM.

It's a lot better than it was factory!! Once it gets going, it shifts nice. I have a 2/10 of a second lang between when I push the acceleration pedal and the ECU records axle rotation!?

I'll try and load a couple logs from last season!

 

[Coyote Chaser]

Hey guys, I'm still chasing that ET and HP number!
Installed the new turbocharger and loaded a new NX2/E85 tune, then loaded up the car and went to Florida for testing and some competition.
But actually posted a slower ET with a higher MPH (I'm car 8228)!??

 

[Coyote Chaser]

The car was real weak off the line, like it wasn't getting enough fuel, but once it got going, it pulled strong!??

 

[2020Tang]

The car was real weak off the line, like it wasn't getting enough fuel, but once it got going, it pulled strong!??

Would this be a characteristic of the NX2 turbo? Isn’t the rpm range 500 or so higher? On E85 are you just running the HPFP only with stock injectors? or did you upgrade injectors as well? Could be reaching limit on the stock injectors perhaps.

 

[Coyote Chaser]

Would this be a characteristic of the NX2 turbo? Isn’t the rpm range 500 or so higher? On E85 are you just running the HPFP only with stock injectors? or did you upgrade injectors as well? Could be reaching limit on the stock injectors perhaps.

I'm running 2 injectors per cylinder, 4 high pressure direct injectors and 4 low pressure port injectors. I double checked everything twice, while at the track and didn't find anything wrong. I have the car back at my shop and am going to dig into it a little deeper.

PS: From what I have read about the NX2, they are supposed to ramp up similar to the stock turbocharger.

 

[Melvin]

The car was real weak off the line, like it wasn't getting enough fuel, but once it got going, it pulled strong!??
View attachment 44640

How's the NX2 treating thus far? Is the difference night and day compared to the stock turbo?

 

[Coyote Chaser]

How's the NX2 treating thus far? Is the difference night and day compared to the stock turbo?

It's awesome!
I was concerned about how week it was coming off the line, but I didn't find anything wrong between my air filters and tailpipe, and after reviewing my data logs, I confirmed it isn't an air problem! Boost and airflow climb from launch, all the way through the traps.
I'm still looking into the fuel delivery and ignition systems.