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90 mph max speed 93' f150

 
  #16  
Old 12-04-2009, 02:26 AM
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Originally Posted by Redneck1465 View Post
You have to be killing your fuel economy if your giong that fast. Personnaly I dont go over 70-75 in my 94 F150 300ci and I get almost 20 on the highway. I dont think I would even want to see if my truck would do 90 no point to it. If I want to go fast I'll get a car that is made to go fast.
If fuel economy were an issue I would not have 4 full size pu's in my stable. Highway speed is not the biggest killer of FE. I run 75-80 on the highway and tend to be a bit heavy footed on accels. In my 93 4.9l 5 spd I get about 18mpg.

"If I want to go fast I'll get a car that is made to go fast." That is why I stated it would be going in an FFR Roadster. It will be more than capable of those speeds.
 
  #17  
Old 12-04-2009, 06:22 AM
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I think it has to be speed related, because it can rev much higher than the RPMs are turning when it cuts off.
 
  #18  
Old 12-04-2009, 06:24 AM
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Originally Posted by jem44357 View Post
If fuel economy were an issue I would not have 4 full size pu's in my stable. Highway speed is not the biggest killer of FE. I run 75-80 on the highway and tend to be a bit heavy footed on accels. In my 93 4.9l 5 spd I get about 18mpg.

"If I want to go fast I'll get a car that is made to go fast." That is why I stated it would be going in an FFR Roadster. It will be more than capable of those speeds.
You didn't say before, but why would you choose this engine for a factory five car? Its a low reving motor and is not really suitable for this setup. I don't think the car will be all that fun to drive. It also won't have the V8 sound that it should. Also, with the length and height of the 300, it may not even fit in the car very well. I am curious.
 
  #19  
Old 12-04-2009, 06:40 AM
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Originally Posted by Chevy 6.2D View Post
Back when I had a tach in my '91 it cutoff somewhere around 2700-3000 RPM. I believe this is about 100MPH. How does a rev limiter stop it at 3K (or so) in 5th but not in other gears. I'm pretty sure it's speed related, not RPM.
A lot of the ECU/EEC/PCM computers do not have any information about speed going into them so how could it be speed related?
The only way would be from the PIP and then computer would have to know the rear end ratio and the gear ratio that you are in to figure out your speed.
Not all of the Ford computers know what gear you are in either and these are mostly the ones with no speed input also (pin #3).

I personally do not think there is a speed limiter or rev limiter. I think is a selling ploy or scam by the add-on chip makers to sell their product.
I think the RPM is limited by the magnetic flux ability to build and decay on the Ignition coil, Fuel injectors and the intake/exhaust valves to float. There is a possibility that the injectors may also float.
Another factor is wind resistance vs HP to stop you when the you no longer have the HP to overcome the wind.

OBD II may very well have both limiters but I do think an OBD I trucks do although some cars may.
 
  #20  
Old 12-04-2009, 06:57 AM
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My 95 302 OBDI had a rev limiter in it , you don't notice it when its stock because the trans will shift before you hit it if its an auto . After i put a different motor in it & started shifting it manuely it hit at about 5200-5400 RPM if i reamember right . Had to go into the computer to eliminate it .....
 
  #21  
Old 12-04-2009, 07:08 AM
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Originally Posted by lew52 View Post
My 95 302 OBDI had a rev limiter in it , you don't notice it when its stock because the trans will shift before you hit it if its an auto . After i put a different motor in it & started shifting it manuely it hit at about 5200-5400 RPM if i reamember right . Had to go into the computer to eliminate it .....
When you say you had to go into the computer to eliminate it I take it you are adding an after market chip on the back of the computer.
If not do you have a print out of your computer program and look up tables?
If so could you email them to me I would like to read them.
Some years may have and more than likely do have rev limiters but I do not think all years do.
 
  #22  
Old 12-04-2009, 08:47 AM
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I had a custom chip burned for it , I didn't get a print out ....
 
  #23  
Old 12-04-2009, 10:49 AM
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OBD-1 computers do have speed and rev limiters but most people never hit them because of the transmissions, overall gearing, and lack of power these truck have. You can see a list of scalars in this document... http://www.auto-diagnostics.info/pdf/ford_eectec10.pdf
 
  #24  
Old 12-04-2009, 12:12 PM
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Thanks Paul , that was a good read , not that i understand any of it .....Lew
 
  #25  
Old 12-04-2009, 12:29 PM
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Originally Posted by Conanski View Post
OBD-1 computers do have speed and rev limiters but most people never hit them because of the transmissions, overall gearing, and lack of power these truck have. You can see a list of scalars in this document... http://www.auto-diagnostics.info/pdf/ford_eectec10.pdf
If this is true where do the computers get the speed information that do not have an input on pin #3?

There is a lot of good information in that PDF and I have read it many times but some of the information is from another book on cars. I wonder if that source knows that speed limiters are in the software for sure or not. If they do have speed limiters I wonder what years they have them and if trucks do. I know the PDF is talking about cars and not trucks.
 
  #26  
Old 12-04-2009, 10:57 PM
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I don't really think the computer has any idea of how fast the truck is going or what gear it's in (at least on the cable speedos) but I'm fairly sure mine is a speed limiter. With my foot on the floor in 5th it dies out for about 5 seconds, truck slows down, it comes back for maybe 10-15, then dies again, and so on. Holds right around 100MPH
I'd be interested to know how it works- my old '90 150 300 5spd 2x4 did the same thing.
 
 
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