Club Cobra Gas-N Exhaust  

Go Back   Club Cobra > Manufacturers, Engine Builders, tools, and parts. > BackDraft Racing ---

MMG Superformance
Nevada Classics
MMG Superformance
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
MMG Superformance
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
May 2024
S M T W T F S
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31  

Kirkham Motorsports

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 12-18-2019, 06:18 PM
bobcowan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Location: Colorado Springs, CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
Not Ranked     
Default Torque Converter Upgrade

So, I installed the stock 6R80 transmission behind the stock (sort of) 2014 Coyote engine. Seemed like a good place to start. The car ran great, and is a blast to drive.

But there were a few things about this that really bugged me:
-- the 1-2 upshift was pretty harsh. Almost like a kick in the bu tt. Some custom tuning improved it, but still pretty harsh.
-- Apparent poor brake function. In Neutral, the brakes work really well, and feel great. In Drive, not so much.
-- speaking of brakes, any little bit of sand or water, and the front tires would lock up and slide before the car stopped.
-- Shifting from Park to Drive was a bit of a bang.

Apparently, the stock torque converter has a 2,800 rpm stall speed. And that's too low for a car this light. Also, I read that the stock converter is good for about 500hp. More than that, and it will eventually be destroyed.

I purchased a new torque converter from Circle D Specialties; lock-up, triple disc, billit construction, yada, yada, yada. Stall speed 3,200-3,400. I took it to a trans shop to do the swap because I am unable to do that kind of heavy lifting at the moment.

I drove it home today. Still some snow and ice on the roads, so I didn't drive very far. But what a huge improvement! Brakes are instantly better. The 1-2 shift is significantly better. Still slid a bit on the ice, as expected. I can't wait for better weather when I can get it out for a real run.

All in all, a significant improvement, and well worth the price tag.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Reply With Quote
  #2 (permalink)  
Old 12-18-2019, 11:26 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,647
Not Ranked     
Default

Bob,

Where does your engine idle, OEM or aftermarket ECU and what are you using to control the trans?



Ed
__________________


Help them do what they would have done if they had known what they could do.
Reply With Quote
  #3 (permalink)  
Old 12-19-2019, 07:57 AM
bobcowan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Location: Colorado Springs, CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
Not Ranked     
Default

It's all stock Ford stuff. I bought a donor palate with everything included. Engine idle is right about 750, just like stock.

At the time, there were no real options for a shifter. So I used this electronic shifter.
https://www.powertraincontrolsolutio...utton_Shifter/
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Reply With Quote
  #4 (permalink)  
Old 12-19-2019, 02:15 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,647
Not Ranked     
Default

At your idle rpm the transition from park or neutral into gear should be relatively soft, especially with that converter. Additionally unless you are on it, the gear change from first to second should also be soft. Sometimes if the converter clutches are dragging these events will take on an impressively harsh quality.

The converter lock up is tunable in the ECU strategy. It is possible the previous owner was fiddling around there and left it in a frisky condition. There are a number of aftermarket tuning products available for that engine trans combination. The one with the worst customer service is SCT. The HP-Tuners folks are much friendlier and easier to work with.

You might want to investigate aftermarket alternatives that have support for ECU controlled transmissions. One of the best featured and best priced is MegaSwuirt through DIYAutoTune. They have a plug and play version for the SN95 cars that has all the TiVCT controls already in the software but not turned on. The ECU uses all Ford sensors or whatever you wish to use and could support your TiVCT system if you elect to keep it or it could ignore it if you chose to operate it that way.

The MS3Pro units that DIYAutoTune sells come with lifetime warranties, tuning software data logging software and cost the same (~$1K) as a tuning software only package from someone like HP-Tuners or SCT. You don't need the top of the line race unit you only need the #2 offering that comes in at ~$1K. If you want to use a Plug and Play model the price goes up to ~$1,350.

The big deal is you are in 100% control of the engine and trans tuning.


Ed
__________________


Help them do what they would have done if they had known what they could do.

Last edited by eschaider; 12-19-2019 at 02:19 PM.. Reason: Spelling & Grammar
Reply With Quote
  #5 (permalink)  
Old 12-19-2019, 03:08 PM
bobcowan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Location: Colorado Springs, CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
Not Ranked     
Default

It is. Once warmed up, I shifted it in and out of park a couple of times. I could feel it, but still nice and soft. A lot like my truck, and softer than my wife's Ford. I could probably have gone a step up on stall speed, maybe 3400-3600? We'll see how it performs when I get to drive it more than around the block. At the moment, I'm thinking it's perfect for my needs.

I had a Megasquirt on my FFR. And I also use Megasquirt on my race car. I bought both of them custom built from DIY. Both were installed with a custom wiring harness that I built myself. Very simple, easy to work on, and adjust. Dead nuts reliable, too.

But this is my fun street car. I want to put gas in it and drive it. I'll do routine maint once a year, and leave it at that. I want durability over light weight. For that, the stock computer and wiring harness fits the bill perfectly. Easy to tune, set once and forget. Besides, I already own them.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Reply With Quote
  #6 (permalink)  
Old 12-19-2019, 04:37 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,647
Not Ranked     
Default

I see I was preaching to the choir . Apologies Bob, I didn't mean to be pedantic.


Ed
__________________


Help them do what they would have done if they had known what they could do.
Reply With Quote
  #7 (permalink)  
Old 01-07-2020, 08:03 AM
bobcowan's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Location: Colorado Springs, CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,434
Not Ranked     
Default

Had some nice weather this weekend - 60* and sunny (I love Colorado!). Took the car out for a couple of hours. Drove in traffic, and some open roads. Hammered the throttle a few times, but mostly gentle street driving in traffic.

A significant improvement. Shifts are gentler, especially the 1-2 upshift. Other shifts are almost imperceptible, even under hard throttle. Brakes are much improved. Car is much more predictable and easier to drive.

I think going a bit higher on the stall would be slightly better. I installed a 3,200-3,400 stall, but going one step higher to 3,400-3,600 will improve low throttle operation, and braking.

I'm going to use the engine oil temp as a trans temp gauge. When I can get time, I'll install the sensor in the cooler line. Summer time in the mountains might heat up the fluid. Or not. We'll see.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 06:50 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink