Power Hungry Performance Forum Armed Forces Forum

Visit dYgYtAl Radio!


Go Back   Power Hungry Performance Forum > Ford F-150, Expedition, Navigator, Blackwood, Mark-LT, SVT Lightning and H-D Editions > 2004 to 2008 F-150 and Mark-LT


2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 08-12-2009, 08:37 PM
Double Whopper with Cheese
 

Join Date: Nov 2008
Location: Kelowna, BC Canada
Posts: 108
04FX4 is on a distinguished road
Default Transmission shifting question.

Why is it when I shift my tranny manualy into a lower gear it seems as if it does not have the same amount of HP and TQ when it shifts into a lower gear on its own?
Example going up a hill towing my trailer in drive ,when it shifts into 2nd it has lots of power, and when I manualy put it into 2nd it seems as if it does not have the same power.
Reply With Quote
  #2 (permalink)  
Old 08-12-2009, 08:52 PM
08F150's Avatar
Double Whopper with Cheese
 

Join Date: Mar 2009
Location: Quebec, Canada
Posts: 24
08F150 is on a distinguished road
Default

There was some discussion somewhere on the forum about that before. I think the pcm drops the power level of the engine (torque reduction) when manually shifted if I remember correct. I don't remember why it does it but I'm sure someone here should remeber why.
__________________
http://dygytalworld.ehost-services139.com/forums/image.php?type=sigpic&userid=413&dateline=12431928  91
Gryphon with 87 Economy tune, 87 Tow tune, 91 Performance tune
Roush off road exaust
Reply With Quote
  #3 (permalink)  
Old 08-12-2009, 09:43 PM
JackandJanet's Avatar
PHP Groupie
 

Join Date: Nov 2008
Location: Among Javelinas and Scorpions Near Tucson, AZ
Posts: 5,303
JackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of light
Default

Quote:
Originally Posted by 08F150 View Post
There was some discussion somewhere on the forum about that before. I think the pcm drops the power level of the engine (torque reduction) when manually shifted if I remember correct. I don't remember why it does it but I'm sure someone here should remeber why.
There WAS a discussion on this - quite a while back and I entered in on it too. It's something to do with the way Ford has set up torque in 2nd gear.

I think there's a reduction at either low speed or low RPM to help you get moving on "slippery surfaces". Remember the old trick of starting in 2nd on ice to avoid spinning the tires? (Naw, you're too young). But anyway, above a certain speed or RPM, full torque transfer comes in and you can pull like a bandit!

I pull my 3600# trailer up over the high Colorado passes (11,000+ feet) with the transmission locked in 2nd.

- Jack
__________________

2005 F150 KR SCrew 5.4L 4x4 with PHP Gryphon CTS programmer
Reply With Quote
  #4 (permalink)  
Old 08-12-2009, 10:04 PM
Longshot270's Avatar
Forum Predator
 
Join Date: Jul 2009
Location: San Marcos, TX
Posts: 3,062
Longshot270 will become famous soon enough
Default

I know on the display where you can pick four options to watch and one of them is the torque management. I think it would be a good experiment to have that up and try it next time you tow. Play with the auto 2nd and the manual 2nd and then come tell us the results.
__________________
Reply With Quote
  #5 (permalink)  
Old 08-12-2009, 10:21 PM
Longshot270's Avatar
Forum Predator
 
Join Date: Jul 2009
Location: San Marcos, TX
Posts: 3,062
Longshot270 will become famous soon enough
Default

AH HA! found it, the article is called "Question for the Mad Dr."

Name fooled me, had to do a little cross refrencing between JandJ's posts and a search, thats why it took so long but I guess within 15 minutes out of hundreds of posts about towing isn't so bad.
__________________
Reply With Quote
  #6 (permalink)  
Old 08-12-2009, 11:02 PM
JackandJanet's Avatar
PHP Groupie
 

Join Date: Nov 2008
Location: Among Javelinas and Scorpions Near Tucson, AZ
Posts: 5,303
JackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of lightJackandJanet is a glorious beacon of light
Default

Quote:
Originally Posted by longshot270 View Post
AH HA! found it, the article is called "Question for the Mad Dr."

Name fooled me, had to do a little cross refrencing between JandJ's posts and a search, thats why it took so long but I guess within 15 minutes out of hundreds of posts about towing isn't so bad.
"Searching" is such fun, isn't it? You notice I didn't even try. :o

- Jack
Reply With Quote
  #7 (permalink)  
Old 08-12-2009, 11:18 PM
88Racing's Avatar
SENIOR MODERATOR
 

Join Date: Feb 2009
Location: Somewhere ....
Posts: 7,303
88Racing is a glorious beacon of light88Racing is a glorious beacon of light88Racing is a glorious beacon of light88Racing is a glorious beacon of light88Racing is a glorious beacon of light88Racing is a glorious beacon of light
Default

Bringing up my early days on here!
Oh well.
Enjoy!

Lars
__________________

PHP on FaceBook
SENIOR MODERATOR--PTLA
WARNING.....THE FOLLOWING TYPES OF THREADS WILL BE CLOSED OR DELETED...
"Where my tunes?" & "I can't get a hold of PHP?"
Reply With Quote
  #8 (permalink)  
Old 08-12-2009, 11:22 PM
Longshot270's Avatar
Forum Predator
 
Join Date: Jul 2009
Location: San Marcos, TX
Posts: 3,062
Longshot270 will become famous soon enough
Default

Quote:
Originally Posted by JackandJanet View Post
"Searching" is such fun, isn't it? You notice I didn't even try. :o

- Jack
yeah actually I did, so I found it in your own profile.
__________________
Reply With Quote
Reply

Thread Tools
Display Modes

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


Locations of visitors to this page

All times are GMT -4. The time now is 04:03 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.2
All Contents Copyright 2008, Power Hungry Performance