19 - Throttle response question

[Frank.Herbst]

Went for a ride today and got out to a location where letting the engine turn up a little was OK. The car only has 300 miles so I wasn't trying to push to much. I gave it may 3/4 throttle and held the pedal steady. The exhaust was set on Sport and as the RPM went up through 4500-5000 there was a noticable increase in sound and power. It sounded great and I could feel the increase in acceleration.
Could the exhaust have opened more at that RPM? Not sure if this was simply the computer being happy at that RPM and giving more timing. Only know I don't remember my 17 ever doing this.

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[Big Ernie McCracken]

You are feeling the power band kicking in. The motor starts coming alive up there.

 

[FDHog]

Frank, you have about the same amount of miies as I do. Took it out for a ride the other day and noticed the same thing. I had been shifting at 3000-3500 but I let it go to 4-4500 and the engine felt completely different. Smooth and powerful. I know this doesn't require a normal break-in, but still don't want to beat on it for the first 1K.

 

[Rapid Red]

Frank, you have about the same amount of miies as I do. Took it out for a ride the other day and noticed the same thing. I had been shifting at 3000-3500 but I let it go to 4-4500 and the engine felt completely different. Smooth and powerful. I know this doesn't require a normal break-in, but still don't want to beat on it for the first 1K.

That's the range, the Mustang barks and snaps, fk gas milage. Someone wants gas milage go buy the vw.

Do not think 4-4500 will hurt you break-in wise. Have 300 on my clock after the first 100 miles, started to push on the car a bit harder no red lining. But fore sure 4 -4500, another reason to have the 6sp.

Standard transmission is prefect for break-in cause RPM varies constantly. These Mustangs are just over the top style and performance wise, Ford did a great job.

Don't ya love the down shift assist? Took some driving to get use to the shift pattern. Always having a 4sp, missed 3rd going up and 4 coming down.

LMAO, with some seat time discovered the trick to 3 & 4.

 

[Frank.Herbst]

Frank, you have about the same amount of miies as I do. Took it out for a ride the other day and noticed the same thing. I had been shifting at 3000-3500 but I let it go to 4-4500 and the engine felt completely different. Smooth and powerful. I know this doesn't require a normal break-in, but still don't want to beat on it for the first 1K.

Based on Ford's information letting them wind up some seems to be fine, especially after the first 100 miles. Guess that's been coverd plenty on this site.
I'll be 65 in June but the feeling of power just never gets old. My first car was a 63 Falcon I put a HiPo 289 in out of a wrecked car. I still remember how much fun the Falcon was. It out ran a 396 Chevelle, you should have seen his face. He couldn't believe an ugly little Ford could be that quick.
Good to hear you are enjoying your Shelby.

 

[Andy13186]

Sport mode changes throttle pedal , you get more throttle with less pedal. You can feel it accelerate more when you switch to sport with steady throttle. Also sport mode does open the exhaust valves at some throttle inputs I think.

 

[Frank.Herbst]

Sport mode changes throttle pedal , you get more throttle with less pedal. You can feel it accelerate more when you switch to sport with steady throttle.

I remember reading about that, I also could tell in the 17 that the suspension tightened up in sport mode on the track. We have a track day scheduled for May 30th, not sure the track will be open but hope it will.

 

[Teezlr]

My 2015 does the same thing, 1/4 - 3/4 throttle at 3800 rpms or so the CMCV or charge motion control valve or the IMRC intake manifold runner control... they open and close, closed for more torque at lower rpm (closed), full throttle you won't feel it as, partial throttle you can feel the valves open and engine adjust etc, I enjoy partial throttle pulls as much as full throttle because of that reason.

 

[Frank.Herbst]

My 2015 does the same thing, 1/4 - 3/4 throttle at 3800 rpms or so the CMCV or charge motion control valve or the IMRC intake manifold runner control... they open and close, closed for more torque at lower rpm (closed), full throttle you won't feel it as, partial throttle you can feel the valves open and engine adjust etc, I enjoy partial throttle pulls as much as full throttle because of that reason.

I don't remember hearing about that, but it might explain what happened.

 

[FDHog]

Based on Ford's information letting them wind up some seems to be fine, especially after the first 100 miles. Guess that's been coverd plenty on this site.
I'll be 65 in June but the feeling of power just never gets old. My first car was a 63 Falcon I put a HiPo 289 in out of a wrecked car. I still remember how much fun the Falcon was. It out ran a 396 Chevelle, you should have seen his face. He couldn't believe an ugly little Ford could be that quick.
Good to hear you are enjoying your Shelby.

LOL. Just turned 66 in Jan. Went from a Corvette GS to this. Corvette was nice, but this thing is a beast. I smile a lot more.
Learned stick on a 440 GTX 6 pack. Late 60's early 70's cars were great.

 

[Frank.Herbst]

LOL. Just turned 66 in Jan. Went from a Corvette GS to this. Corvette was nice, but this thing is a beast. I smile a lot more.
Learned stick on a 440 GTX 6 pack. Late 60's early 70's cars were great.

We we're lucky to be around for the 60s and early 70 cars. Don't remember people being as interested in factory performance cars for a long time between then and these newer Mustangs and Shelby's. Great to see the enthusiasm again. I guess it really got back in high gear starting with the 2007 GT500.

 

[Teezlr]

Just saw that you have a GT350, not sure if they run the same intake manifold design using the IMRC... but here is a link to see the differences in engines by generation. The GT350 definitely has a change in power band at 3250, here is what motor trend said after they tested it on the dyno.. this is previous generation not the 2019 like yours... some slight differences in engines

"As always, peak numbers are just one set of data points. It’s the shape of the curve that matters. Notice that at very low revs, the V-8 struggles to make torque. At 1,500 rpm, it’s producing just 238 lb-ft—not a lot for a big-displacement, long-stroke V-8. In real-world driving, that output is accompanied by occasional stumbles; it’s clear the engine isn’t happy at low revs. Torque builds slowly, however, until 3,250, when something big happens.

Very big. From 3,250 to 3,750 rpm, torque output jumps by a huge 27 percent. And from there to about 6,250 rpm, it’s essentially a huge plateau of peak torque with a few bulges likely caused by resonances in the intake system. Even then, torque starts to fall only slowly all the way to the fuel cut. Ford quotes that as happening at 8,250, but our GT350 cut fuel earlier—8,200 rpm was the highest we saw, and even that only occasionally. Our best run made it only to 8,050 rpm before the limiter kicked in."

 

[Frank.Herbst]

Just saw that you have a GT350, not sure if they run the same intake manifold design using the IMRC... but here is a link to see the differences in engines by generation. The GT350 definitely has a change in power band at 3250, here is what motor trend said after they tested it on the dyno.. this is previous generation not the 2019 like yours... some slight differences in engines

"As always, peak numbers are just one set of data points. It’s the shape of the curve that matters. Notice that at very low revs, the V-8 struggles to make torque. At 1,500 rpm, it’s producing just 238 lb-ft—not a lot for a big-displacement, long-stroke V-8. In real-world driving, that output is accompanied by occasional stumbles; it’s clear the engine isn’t happy at low revs. Torque builds slowly, however, until 3,250, when something big happens.

Very big. From 3,250 to 3,750 rpm, torque output jumps by a huge 27 percent. And from there to about 6,250 rpm, it’s essentially a huge plateau of peak torque with a few bulges likely caused by resonances in the intake system. Even then, torque starts to fall only slowly all the way to the fuel cut. Ford quotes that as happening at 8,250, but our GT350 cut fuel earlier—8,200 rpm was the highest we saw, and even that only occasionally. Our best run made it only to 8,050 rpm before the limiter kicked in."

Not sure about torque, guess torque coming in could be what we felt. Nice that it was accompanied with a fantastic sound.

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