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90 mph max speed 93' f150

 
  #1  
Old 12-03-2009, 05:43 AM
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90 mph max speed 93' f150

I have a 1993 F150 reg cab 2wd 4.9l 5spd. It will cut off at 90 mph (may be different now I have larger then stock tire on it). I have been told it is due to the fact that the tires available for it back in the day were not high speed rated. Is this true? So my plan is to use this in my FFR Roadster which I may want to go a bit faster than that in. Is there anyway to cure this? Can I have it reprogrammed or can I buy something and do it my self? Or would an EEC from a ambulance or fire truck have a higher limit? The reason I ask the last question is because it is red and it states on the door post that it is not ambulance equipped.


Jim
 
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Old 12-03-2009, 05:47 AM
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Yeah my '91 f150 only goes 90mph as well, id be interested to know if there is a limiter or if that is just the top speed
 
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Old 12-03-2009, 06:08 AM
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There is a limiter. It is there for a reason. Our trucks are not really all that safe above 100 mph. They are not setup for high speed at all. Most tires available for our trucks are only rated for about 120 mph anyways. Some are not even rated for that.

Why would you put a 300 in a factory five cobra? Its not a high reving motor and really doesn't suite that application at all.
 
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Old 12-03-2009, 06:13 AM
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On that note, how high should the engine rev when you really push it. Mine doesn't go above 4000rpm. is that normal?
 
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Old 12-03-2009, 06:39 AM
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Do you mean 4k is where it shifts at when you punch it? If so, then yes that is normal.
 
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Old 12-03-2009, 07:04 AM
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There's no speed limiter - there's a rev limiter, and it just disrupts the spark to prevent over revving. Hitting it while driving just gives you the sensation of a power loss & some roughness - it doesn't hurt anything or cause any problems. Depending on tire size, gearing, & trans, it might not kick in until 120mph.
To prove there is not a speed limiter you can unhook the VSS on the 91 and you will see can not go any faster.
You would not be able to do this on the 93 as you would lose the speedometer so you could not tell.
The 1986 Trucks Computer did not even have a wire to pin #3 on the computer for speed input.
 
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Old 12-03-2009, 09:16 AM
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yea prolly the rev limiter whats ur rear end geared mine is 3.08 so when i get the zf in it it will do way over 90.... like i would be able to tell lol speedometer only shows to 85 for now... going to get a gauge set from autometer that reads to 120... coz i dont like going slow and not knowing how fast im going after 85 sux.
 
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Old 12-03-2009, 10:12 AM
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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.
 
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Old 12-03-2009, 11:46 AM
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I pushed my truck hard the other day. Bottomed the speedo out - must have been going 90. The limiter kicked in and killed my fuel delivery. My pedal came back into action after only a few seconds.
 
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Old 12-03-2009, 10:05 PM
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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.
 
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Old 12-03-2009, 10:27 PM
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Yeah, it's speed related I believe.
 
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Old 12-03-2009, 10:40 PM
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I hit 5200 rpm with my 96 F150 300 six in second gear/ 4high, I was climbing a pretty good sized sand dune up at Silver Lake this past summer. It was a really rough spot so I really had to get after it pretty hard, she made to the top though! Sure made the guy behind me in a Chevy Duramax mad he didn't even make it half way up the hill! Those trucks are heavy and don't have the rpm range needed for sand dune climbing. I had this truck up to 94 mph (according to my GPS) on the highway, she was still slowly pulling but I let out of it.
 
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Old 12-03-2009, 10:43 PM
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I've always wondered if mine had a rev or speed limiter(91) cause according to a gps speedo i was going 110 in mine and that's with stock size tires and 3.55 rear. i don't drive that fast normally but i was on a trip and wanted to see how fast it would go before it cut off but when it said 110 i said hell no. haha i think i found my personal top speed.

Kyle
 
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Old 12-03-2009, 11:44 PM
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Originally Posted by TexasGuy001 View Post
There is a limiter. It is there for a reason. Our trucks are not really all that safe above 100 mph. They are not setup for high speed at all. Most tires available for our trucks are only rated for about 120 mph anyways. Some are not even rated for that.

Why would you put a 300 in a factory five cobra? Its not a high reving motor and really doesn't suite that application at all.
As I have stated to others that ask this question... because I can! Also I do not believe I need high revs in a 2200 pound Roadster just reliable torque from the bottom up. My original plan was to use my 93 which I purchased new. I now have a new donor another 93 with a rusted frame this will allow me to keep my "baby" in one piece. I have a 78 block which I had rebuilt years ago it has a 0.06" over bore ~30,000 miles. Some thoughts I have entertained will be to drop some Weber's on it and maybe one day add a turbo.

So if it is a rev limiter than an after market ignition system would cure this? If it is speed related is it something that can be reprogrammed or fooled in to thinking it is not going that fast.

Thanks for the replies
Jim
 
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Old 12-04-2009, 02:17 AM
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Originally Posted by Hitokori View Post
yea prolly the rev limiter whats ur rear end geared mine is 3.08 so when i get the zf in it it will do way over 90.... like i would be able to tell lol speedometer only shows to 85 for now... going to get a gauge set from autometer that reads to 120... coz i dont like going slow and not knowing how fast im going after 85 sux.
For the truck 3.73 if I remember correctly. I would have to look it up again. In the kit 3.55.
 

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