Why limited to 100 mph? - Page 3 - Ford Truck Enthusiasts Forums
 

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > EcoBoost (all engine sizes)
Log In 


EcoBoost (all engine sizes) 3.5L Twin Turbo EcoBoost V6, 2.7 Twin Turbo EcoBoost V6, 2.3l/2.0L I4 EcoBoost Engines

Why limited to 100 mph?

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #31  
Old 04-19-2014, 09:19 PM
paredneck33 paredneck33 is offline
Posting Guru
 
Join Date: Jan 2005
Location: penn twp.
Posts: 1,894
paredneck33 has a very good reputation on FTE.paredneck33 has a very good reputation on FTE.paredneck33 has a very good reputation on FTE.paredneck33 has a very good reputation on FTE.
Quote:
Originally Posted by BuzzLOL View Post
. An '85 truck had an 85 MPH speedo that would 'bury' easily?
The speedo reads to 85, that is true. But the needle will actually go way past that. And I know for a fact that the needle in my 78 150 4x4 will rap all the way around. I can't remember if the one in my 86 150 would do the same or not.
__________________
Alex just another Fordaholic here!!!
Reply With Quote
  #32  
Old 04-20-2014, 09:37 PM
finn finn is online now
Senior User
 
Join Date: Dec 2003
Location: Upper penninsula
Posts: 198
finn is gaining momentum as a positive member of FTE.
Lots of speculation in this thread.

The correct answer is tire speed rating and driveshaft critical speed / harmonics.

Whipping of the driveshaft and subsequent pitching it out the bottom of the truck, and a tire blowout in a truck designed to go faster than the tire speed rating are both items an intelligent design would avoid, hence speed limited by the vehicle electronics
Reply With Quote
  #33  
Old 06-07-2014, 02:55 AM
tgtrotter's Avatar
tgtrotter tgtrotter is offline
Junior User
 
Join Date: Feb 2012
Posts: 69
tgtrotter is starting off with a positive reputation.
Finn, then why did my '01 F250 have a limiter of 94mph but my '05 F250 would go 110mph? Never got it faster because like Raider50 posted "handling got a little sketchy"

I think the OP asked a curiously dumb question being that he already knew the answer. Love this forum !!
Reply With Quote
  #34  
Old 06-07-2014, 05:29 PM
tjc transport's Avatar
tjc transport tjc transport is online now
i ain't rite
 
Join Date: Mar 2005
Location: ElephantIsland Antarctica
Posts: 37,397
tjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputationtjc transport has a superb reputation
i think it is a safety thing. passenger and taxi crown vics are limited to 95. police package crown vics will do 137 mph. and that 137 number was confirmed by 2 different GPS units on the Connecticut turnpike back in 2005. my car and 2 Connecticut state police cars, all topped out at the rev limiter doing 137 mph.
__________________
Tom
Moderator of the "not wrapped too tight forum"
rarely in life do you meet a person that will drop everything to help a stranger,
and give the shirt off his back to a friend.
Steve Price was that kind of person.
Godspeed "window licker", the short bus will never be the same with you gone.
Reply With Quote
  #35  
Old 06-07-2014, 06:11 PM
finn finn is online now
Senior User
 
Join Date: Dec 2003
Location: Upper penninsula
Posts: 198
finn is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by tgtrotter View Post
Finn, then why did my '01 F250 have a limiter of 94mph but my '05 F250 would go 110mph? Never got it faster because like Raider50 posted "handling got a little sketchy"

I think the OP asked a curiously dumb question being that he already knew the answer. Love this forum !!
What was the gear ratio, overdrive ratio, and tire speed rating of the '01 and the '05? Were they the same? Did both have the same wheelbase and driveshaft length?

Medium trucks are often limited by driveshaft harmonics, as were many rear wheel drive cars and light trucks..

There's lots to this fad of actually engineering a design.

Math is your friend.

Just checked Tire Rack: 01 had 16" and '05 had 17 or 18".

Some 01 had Q speed rating: all 17 and 18" tires are R or S rated in a cursory search.

The other issue with the EB speed limiter may have to do with converter cooling. Di engine technology may not be compatible with the strategy of richening up the mixture at high speeds to fuel cool the converters that normal gasoline engines use. (Based on discussions w/ Ford Engine Development engineers a number of years ago).
Reply With Quote
  #36  
Old 08-17-2014, 05:22 PM
scott91370 scott91370 is offline
Senior User
 
Join Date: Dec 2008
Location: Burleson, Tx
Posts: 459
scott91370 is gaining momentum as a positive member of FTE.scott91370 is gaining momentum as a positive member of FTE.
Quote:
Originally Posted by gilchris View Post
Since I asked the question and referred to the safety aspect, safety is obviously not reason enough for me. If you don't have an answer why post?
Why not? You asked for a reason that, more than likely, does not exist.
__________________
2004 - v6 - 290,000 miles and counting!
Reply With Quote
  #37  
Old 08-17-2014, 10:06 PM
85e150six4mtod 85e150six4mtod is online now
Post Fiend
 
Join Date: Apr 2004
Posts: 17,081
85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation85e150six4mtod has a superb reputation
OP sped off after his last post on 10/3/13. This ain't even a sleeping dog--it's a dead horse.
Reply With Quote
Old 08-17-2014, 10:06 PM
 
 
 
Reply


Similar Threads
Thread Thread Starter Forum Replies Last Post
Top speed for 6.2 F250? Fastfwd Super Duty & Heavy Duty 82 10-14-2014 08:01 PM
Questions on the speed limiter. skyfox10 1987 - 1996 F150 & Larger F-Series Trucks 44 07-30-2013 04:49 PM
2011 Ford F-150 Platinum 6.2L DougieGB 6.2L V8 8 10-08-2011 11:07 AM
H9 axle code jsgoss02 1987 - 1996 F150 & Larger F-Series Trucks 22 02-07-2008 07:02 PM


Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > EcoBoost (all engine sizes)

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump



All times are GMT -5. The time now is 07:28 PM.

 

Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup