When I swapped to a ZF I promised myself to stay below 4000-4500 and havent wnet over that yet.

That being said I have turned a Stang w/ a 302 to 6500 and it survived. Not sure if the cam in the Bronc would like that high or not.

So yeah that was a fairly worthless response

 

thats a good questions..... Im thinking somewhere around 5500 max. Im only running 2000 at 60mph (dont know if thats good or not) but have had it alot higher trying to get unstuck.

Good question

 

I have noticed that when I have floored my 5.8, it seems to shift in the 3500-3700 RPM range, I would guess that 4000 RPM's would be a nice safe number. It never hurts to be a little conservative because you wouldnt want to frag your motor going to 5000 RPM's. You have to remember that truck motors are built a little different from car motors, theyre made to work deep down in the low RPM range, just look at 90% of the diesels out there, they have like a 3000 RPM redline (and even then that motor is screaming). If I had to guess I think it would be around 4000 RPM's.

 

Im so use to having a small card with a 5 speed and getting up to 6000-7000 rpms and not worrying around it.

 

I'm with 351, my stock 302 sounds completely wound out right around 3800 or so, why would you need to go any higher in a Bronco?

 

redline is 6K, but I would never take it above 5200. My tranny shifts at 4000 no matter how hard I'm hitting the gas. I have to drop it in first for it to hold to 5K. I did it once, just to see...I didn't feel like I had that much more over 4K anyway...

The 5.3L in my 'Burb, on the other hand....

That thing also redlines at 6K, and when you floor it it'll pull all the way to 5700 before it shifts. It pulls hard all the way up there, too. I love those Vortec motors.

 

was climbing a sloppy clay hill last year...(not making it up)...my truck sounds pretty sweet at 4800....i am running a 5k chip right now, so...?

 

Tach in the truck is 6k. I have manually shifted it at the track at about 4700RPM, that was about where she really began to run out of power. But, it would have taken more RPM, I just wouldn't have been maximizing my shift point-to-power-output.

 

It depends on how long you want the engine to last.A stock cam is usually good for about 4000 RPM,although it will rev to 5000 rpm.When i tow with my F250 with a 351,I limit my rpm to 4500 rpm(stock engine). In first gear(zf 5 speed) I will some times run the engine up to 5000 rpm if I'm starting off on a hill with the trailer on.Higher rpm = more wear and tear on the engine.IIRC Ford calls for a red line of 5000 rpm.

 

let me change my queston...

What I meant was.....................for the cam shaft that is installed in the factory 5.8 from the ford factory.
what would the power band on the spec sheets say it is?
the power band is where the engine is making power... I know my 5.8 in my Blanco has run above the 5k range a bit while mud whomping..
its not that I like running it that high but it happens.. :thumbup
While mud whomping its hard to tell where your still building power due to wheel spin , excitment , etc
the red line on the tach dont mean its the point of parts exploding! :histerica
it more or less the point of maximum power once you get into your red line your just wasting effort.

Thats why an after market tach has an adjustable red lines because different engines build power to a different point.

I agree with many of you about not running any higher than need be.
& for those of you in the know yes I do relize that not only the cam is what determines the power band of a engine. theres many factors that must all work together.
I'm figuring the average R.V. cam dont run more than 5.500 rpm.
So I'll probably have the tach start going red at about 5k & be red by 5.500rpm. what ya guys think? :shrug
but I figured that factory probably claims up to.....4500 -5k

If I had my Bronco with me here at home I would just go look at it..
I'd see what the factory tach claims..
I dont remember a red line on it ...Is there one? :shrug
whos go a pic of a factory tach they could show us..
I hate not having my bronco at home with me. :cry

 

My 93 351 and 94 302 both rev to 5200 and no higher.

 

My 93 351 and 94 302 both rev to 5200 and no higher.

Is that on the tach? or tested on the track? :shrug

I've seen my tach higher than that at Azusa in the mud.( I wasnt trying to , I just looked down & :shocked )

 

My 93 351 and 94 302 both rev to 5200 and no higher.

Is that on the tach? or tested on the track? :shrug

I've seen my tach higher than that at Azusa in the mud.( in the high 5k range , I wasnt trying to , I just looked down & :shocked )
I will probably install a limiter one day because I only noticed once...
Most of the time I'm looking where I'm going.

 

Is that on the tach? or tested on the track? :shrug

The tach goes to 8,000. The ENGINE won't spin faster than 5,200.

 

The bone stock '93 5.8L w/E4OD I'm driving for now shifts @ ~4600 when I stand on it, but I never rev my 4.9L over 3500.

 

The ENGINE won't spin faster than 5,200.

mine does! :thumbup
You might have bad valve springs... :shrug
you know what , Never mind why would you want it to anyways!

 

My 89 302 cut off at 4800...in neutral. Computer wouldnt let it rev any higher than that.
In gear it wouldng go over 4000 or so no matter what was goin on tires or gears wise.

-Will
89 XLT 460

 

Strange.................?

I saw :shocked mine in the high 5's? :shrug
I wonder if there a factory rev limiter thats not working on mine?

 

mine does! :thumbup
You might have bad valve springs... :shrug
you know what , Never mind why would you want it to anyways!

The 302 is in my SS5500 pull truck. Not really street driven much, but the rules say it must have 100% stock internals - and it does, 150000 miles on it too. I'll run it at 5200 RPM for 15 to 20 seconds straight probably 50 times a year for the last 4 years and there has been zero problems from it - except a busted 10.25, but thats another story. I'm also working on another truck right now to get back in to the 8000 pound diesel classes with.
The 351 is in the bronco. I reved that a few times to redline just for the hell of it when racing other retards and stuff like that.

 

Ive haad mine to 5200 and it felt like it hit a limiter, but truely after about 4200, it isnt makeing power, just shift and stay on it :toothless youll go faster that way.
Tim

 

happy

 

My stock 5.8 (93) shifts at 3700 at full throttle no matter what. I think that ~3700 is where the engine makes its peak power. I'm not a big fan of high RPM in a truck motor anyway; I try to keep mine under 3500 as much as possible (I know I'm a wuss :toothless)

 

My stock 5.8 (93) shifts at 3700 at full throttle no matter what. I think that ~3700 is where the engine makes its peak power. I'm not a big fan of high RPM in a truck motor anyway; I try to keep mine under 3500 as much as possible (I know I'm a wuss :toothless)

Yea but the question was about red line. when I was manually shifting, I would take it to 4700 for the exact RPM you state as peak power. Being a slush box, by the time it engaged next gear, I was back down below 3000, and building toward that peak again. Aside from the fun at the dragstrip, I am a wuss too by your definition.

 

My stock 5.8 (93) shifts at 3700 at full throttle no matter what. I think that ~3700 is where the engine makes its peak power. I'm not a big fan of high RPM in a truck motor anyway; I try to keep mine under 3500 as much as possible (I know I'm a wuss :toothless)

:histerica
The trans shift point has nothing to do with where the engine builds its peak power! :histerica

Its funny how so many of you,
Know so little about how the engine & trans combo actually works...

Its just like how little I know about 4x4 systems I guess...
But hey , I'm learning.. :thumbup

The factory DOES NOT set the trans to shift anywhere near the peak power of the engine in the truck or car...
you must under stand that the factory looks at the overall biggest picture!
in other words they look at what the average person that buys the car or truck wants....
most are not enthusiast..... :shrug
they want the trans to shift smooth & soft..( most would probably prefer not to even notice a shift at all. :wacko

they would all smile & say WOW its shifts so smooth............ I love that car :thumbup

Thats part of why shift kits for trannys are so popular....
Because they hold the tranny in gear longer so that the enigine has a chance to build power before it shifts!
& the real race doodes that drag race have the manual automatics so that they can really let the engine get into its power band before shifting.

Its not nearly as smooth shifting at peak power.
The average consumer would go right back to the dealer and say "my car isnt working right its revs alot then shifts hard" :histerica

Then again I must point out that I have been pretty much talking horsepower!
now Torque thats different.....

But the red lines on tachs dont usually have anything to do with torque

for example the Ford Racing cam shaft I bought for my 347 is the E303
its the smog legal R/V cam( bottom end power ) .
it builds peak horsepower @ 5,500 RPM
But the Peak Torque comes in @ 2,500 RPM...

Man I could go on for pages & pages about all this kind of stuff.....
But I will spare you! :goodfinge

 

:goodfinge