not hitting 6 rpms
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Elder User
Joined: Dec 2004
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From: Woodland Hills
not hitting 6 rpms
i've noticed that on my 5.4, 2x4, '00 EB the gear shifts from 1st to 2nd at 5rpms when i floor it. the gauge goes to 6, and i know that with my old '97 5.4 she would go all the way to redline before shifting with my foot to the floor.
is this just how the '00s are? i know i can just manually shift (which is a pain with the steering wheel shifter) to max out the rpms, i'm just wondering why this truck acts differently than my '97 and if the same thing happens with other trucks out there.
al
is this just how the '00s are? i know i can just manually shift (which is a pain with the steering wheel shifter) to max out the rpms, i'm just wondering why this truck acts differently than my '97 and if the same thing happens with other trucks out there.
al
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Joined: Mar 2006
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I also think it's a precaution thing by the ECU or something. It won't let you redline it to protect the motor. On some cars you can leave it in park, floor the pedal, and it won't allow it to redline. Kind of like a governor.
03 Expy 4.6L 4x4
03 Expy 4.6L 4x4
Postmaster
Joined: Nov 2001
Posts: 4,742
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From: OK
The PCM is programmed to shift around 5400 RPMs. As you have found, you can get it above that by manually selecting the gears- but there is no good reason to go above the factory shift-point. The engine's power really drops off above 5000 RPMs. Anything higher and you're just making noise and burning fuel.
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Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
all stock modular engines are preset to shut cylinders down at 5,150 rpm the redline for a modular engine is about 6000 rpm but they make very little power there. the factory tach goes past the preset simply to look more fantastic than it is. the 03+ have 7,000 rpm tachs but the pcm only goes to 5,150 rpm.
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Elder User
Joined: Dec 2004
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From: Woodland Hills
cool, thanks for the replies. i wasn't interested in reaching 6 rpms for the power, i just like to push my vehicle's engines to the max at least once a month or so (i feel like it's good for the engine (or at least better than not going over 4 rpms for years)).
but i could have sworn that my '97 would max at 6...oh well, prob just my horrible memory.
al
but i could have sworn that my '97 would max at 6...oh well, prob just my horrible memory.
al
Post Fiend
Joined: Jun 2003
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I'd like to reasonably disagree that mod motors don't make power up high. Stock motors don't, I agree; however the top end has the ability to flow much better than say your average 302. Especially the DOHC models. Trust me on this.
Senior User
Joined: Jul 1999
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From: Monroe, NC
I would tend to think that the DOHC motors would make more power up top, better breathing I guess. I have an 06 Chevy uplander work van, and you can floor it in park or neutral and it will only rev to 3.5K, It will go higher while driving, but getting it above 5K it starts to rattle quite a bit. 3.5 v-6. I do have to say it is way better than the 04 express I did have with the 4.3, what a slug!!!!
Senior User
Joined: Jan 2003
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From: Tucson
The Mod motors love RPM and as mentioned the 32V really likes it. The problem with our trucks is low end torque, you can't get low end torque and high RPM horsepower. Mainly due to the intake runner length and Cam profile used in the truck line of motors. The modular motors themselves are safe to 6000 no problem and built right these things are raced at 7200 RPM in drag racing applications in abviously a much lighter vehicle.
Dave
Dave
Dave
Dave