Auto Transmission Discussion.

[Cascadia_302]

I find I do exactly this as much as anything, downshift plus engine breaking to slow down. I think it's a nice "feel" thing to add to an auto.

Right, that why it's there. Just be careful (obviously) to not over-rev the engine.

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[unintelligible]

Right, that why it's there. Just be careful (obviously) to not over-rev the engine.

You can't money shift an auto.

 

[JimmyTwoTimes]

Right, that why it's there. Just be careful (obviously) to not over-rev the engine.

It won't let you shift into too high or too low of a gear. I've trying shifting into 6th at 25 mph (which would be ideal for me since that's the speed limit in NYC and I like hypermiling) and it won't let me. Same with trying to downshift into 2nd at 70 mph.

 

[Cascadia_302]

Yeah, I wondered about that. My max will do it only because it has a separate manual mode. You can spike it pretty good, you just can't go from top to bottom all in one shift.

 

[Five Oh Brian]

What does it do? How much was it? Is it worth it on a EcoBoost?

An aftermarket stall converter allows the car to launch at much higher rpm's for much quicker acceleration - much like revving up a car with a manual trans and letting out the clutch quickly at high rpm's. Also, on upshifts at wide open throttle, the car stays at higher rpm's - closer to peak torque - to greatly improve acceleration. Circle-D makes the best converters, IMO. About $1100 and then about $400 in labor to install. My car dropped six tenths of a second in the 1/4 mile from the converter swap. That's serious bang-for-the-buck! An EcoBoost would benefit similarly.

 

[Cascadia_302]

An aftermarket stall converter allows the car to launch at much higher rpm's for much quicker acceleration - much like revving up a car with a manual trans and letting out the clutch quickly at high rpm's. Also, on upshifts at wide open throttle, the car stays at higher rpm's - closer to peak torque - to greatly improve acceleration. Circle-D makes the best converters, IMO. About $1100 and then about $400 in labor to install. My car dropped six tenths of a second in the 1/4 mile from the converter swap. That's serious bang-for-the-buck! An EcoBoost would benefit similarly.

Hi Brian, not a ton of info on their website so what size did you go with and hows the drivability of the 5K stall on the street?

 

[Five Oh Brian]

Hi Brian, not a ton of info on their website so what size did you go with and hows the drivability of the 5K stall on the street?

I went with the 245mm unit and had them custom build a 4E model to flash to 5,000 rpm's. They don't show the 4E on their website dropdown menu, so you have to call it in (or email Chris directly). The 1C-5C models didn't offer a high enough stall speed for my liking. Vendors are now selling Circle-D converters for the 2015 Mustang 6R80 transmission.

The 5K stall speed is only at wide open throttle, so normal acceleration is at much lower rpm's (although noticeably higher than stock). Makes the car feel 500-1000 lbs lighter as it is so responsive, often not needing to downshift to accelerate briskly from a roll. And, when it does downshift from a roll when going WOT, it's explosive acceleration. I've owned several stalled autos in the past, as well as turbocharged and supercharged cars. A stalled auto feels a lot like a positive displacement supercharger in how hard it accelerates from a stop or low rpm's. Easy to spin the tires into oblivion.

Drivability is very good and my car is a daily driver. My wife and daughters can drive it easily with light to moderate throttle. I'd be scared for their safety if they ever went full throttle, though, as it runs 0-100 mph in about 8.5 seconds (0-60 mph is about 3.5 seconds on drag radials).

 

[Cascadia_302]

Very good info...sounds like converter technology has evolved some from when I was running a 3500 stall TCI in the Torino Cobra 25 years ago.
I'm still in a bit of a quandry over deciding on the M6 or A6.
The pros for manual are the PP option and that it won't be a DD. I can drive it when and where I want. Manuals are also a blast to drive. I miss the times when I had the 429SCJ/4 speed combo in the Torino before the C6 swap for strip use.
The pros for the auto are my aching back and knees, I'm not old but I'm starting to get mail from AARP. The auto is (for me) more consistent and competitive at the drag strip.
I'm pretty certain I won't go back to the same level of bracket racing I once did, but would still like to hit the track for some fun.
But to be honest there's a fine line existing for me and I'm really concerned that I'll cross that line and get THAT drag racing bug all over again.
Damn it, I don't even have my Mustang yet and I'm mentally putting together lists of mods to start it all up again.
Anyways it sounds like you have a sweet auto street/strip set-up going. If you drive it to work maybe I can come in check it out. I still owe you a visit anyway as you guys get first shot for my business, regardless on the version of the S550 I buy.

 

[Five Oh Brian]

Very good info...sounds like converter technology has evolved some from when I was running a 3500 stall TCI in the Torino Cobra 25 years ago.
I'm still in a bit of a quandry over deciding on the M6 or A6.
The pros for manual are the PP option and that it won't be a DD. I can drive it when and where I want. Manuals are also a blast to drive. I miss the times when I had the 429SCJ/4 speed combo in the Torino before the C6 swap for strip use.
The pros for the auto are my aching back and knees, I'm not old but I'm starting to get mail from AARP. The auto is (for me) more consistent and competitive at the drag strip.
I'm pretty certain I won't go back to the same level of bracket racing I once did, but would still like to hit the track for some fun.
But to be honest there's a fine line existing for me and I'm really concerned that I'll cross that line and get THAT drag racing bug all over again.
Damn it, I don't even have my Mustang yet and I'm mentally putting together lists of mods to start it all up again.
Anyways it sounds like you have a sweet auto street/strip set-up going. If you drive it to work maybe I can come in check it out. I still owe you a visit anyway as you guys get first shot for my business, regardless on the version of the S550 I buy.

Visit anytime and we'll go for a quick drive in my '14 GT so you can check out the converter. It's a true daily driver, so I take it to work every single day.

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