Rev limiter
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From: Iowa
Rev limiter
What is the rev limiter on the 5.4l and the 4.6l.?.? Just wondering incase i decide to mess with the shift points...Kinda funny that we dont have a red line... or at least not before 6k rpm... i know the engines are rev happy but dang... thats a bit high aint it?
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I really had issues with the my Superchips tuner. I went with their recommended SC default performance tune and eliminated the rev limiter, shifted real nice and firm but the shift points were set way too high rpms for my liking. I find these engines tend to lose their steam at about 4500 rpms and the power dies off. I found by setting the 1-2 gear shifts points worked the best when it was one or two notches more from the stock setting, everthing else was to the SC default settings except shift pressure which I maxed out every gear.
Postmaster
Joined: Oct 2006
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From: SE Texas
The 12" torque converters that are in these transmissions will baloon and cause all kinds of serious damage if revved over 5400 rpms. The intake manifolds are extremely restrictive to make low-end torque,and will not be able to deliver enough air to rev much past 5000 rpms.
JL
JL
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From: Louisville,Ky.
5000 max is a good place to stop. The 5.4L has a very long stroke 4.17". I run all of my tranny pressures turned all of the way up with no torque modulation. It doesn't hurt anything. Just firms up the shifts some and eliminates slippage between gears. No slippage means less clutch wear.
Post Fiend
Joined: Jun 2005
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From: North west La
I wouldn't rev a 5.4 over 5400 rpm. I tried it with my truck & I actually run 3 tenths faster shifting at 5200 than I do shifting at 5800 rpm. You can feel the power drop off after 5200 rpms in my truck.
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Originally Posted by BURNSTOUGHFORD
Where did you put your 1-2 shift point at? Im afraid to max out my shift pressure.... Dont you think it might tear somthing up... im all for it just dont know how far to go?
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changeing all of this bumping shift firmness and pressures up from stock , will it hurt anything or are these tuners built with a failsafe not to go over the excepted limits, ive messed around with the superchip as well and it really changes things a bit, But ive never read or heard of anyone tearing anything up due to installing a tuner of any
kind, Im planning on running the towing features and trying the higher octane tune for the bigger tires i just installed..Im sure it will take some tinkering...
kind, Im planning on running the towing features and trying the higher octane tune for the bigger tires i just installed..Im sure it will take some tinkering...
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Cargo Master
Joined: Dec 2006
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From: Central NY
I used the Hypertech and like the simplicity....it asks you how many RPMS you want to increase, i increased the 1-2 and 2-3 shifts by 300 RPMs and changed the redline by 400 RPMS....as recommended by Hypertech.
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From: Iowa
Originally Posted by xtrford
A tuner won't hurt anything in your truck even if you max everything out. If anything, the tranny will last longer from torque converter slippage.
LOL....advance your timing a few degrees and go drive around for a bit... lol i wouldnt say it wont hurt anything but tranmission wise i suppose.
Postmaster
Joined: Oct 2006
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From: SE Texas
Originally Posted by xtrford
I have never heard of engine damage whatsoever from using a tuner. They really don't do any extreme altering to the PCM like you think.
JL
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Originally Posted by Johnny Langton
It all depends on who's configuring the software on the tuner.
JL
JL
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