free rev

[trailburner]

i've noticed that my vortec4200 will only free rev to about 3400rpm in park or nuetral. in gear goin' down the road it's fine... it'l max out near it's factory rated 6300rpm redline.
my mothers tb, exactly like mine, free revs to 4000rpm.

i've recently discovered that mine started life as a rental!

anyone else run into this? i'm sure it's all in the pcm right?

[bartonmd]

Yes, it's all in the PCM. Companies got tired of redline neutral drops grenading transmissions, so they put rev limits in neutral.

Mike

[trailburner]

thanks! that's what i figured.
........and mine bein' a rental originaly probably explains the even lower rev limit.
i can live with it for now, but it'll have to go when i start puttin' power goodies on it.

[The Roadie]

... it'll have to go when i start puttin' power goodies on it.

I removed the speed limiter in forward and reverse (bet most folks don't know there's a much lower limit in reverse) when I fiddled with my tune. But I see no reason to remove the neutral RPM limiter. Could save your engine if you ever had a accel pedal jam up and you had to drop the tranny into neutral to avoid a runaway. What possible benefit could it have to remove the rev limiter in the presence of "power goodies", whatever they are?

[chevycrew]

Have to be able to rev it up at the stop lights like the rice rockets man!

[gotspeed1]

Power goodies?

[hobbstisdaman]

Wrong forum

[trailburner]

hobbstisdaman why is this the wrong forum? this is truck discussion ain't it? or should it have went in troubleshooting too? my thread about a growlin' noise was moved there. sorry, i'm a noob! it'll take a bit to get used to this forum.

the roadie and gotspeed1, by power goodies i meant engine modifications, performance enhancers....... whatever else you want to call gettin' more power out of it.

back on the topic.......
yeh, the only reason i want to remove the rev limiter is the exact reason chevycrew mentioned...... i like to crack the loudpipes open once in a while! (read that as all the time!)

i have plans for a 40 series flowmaster with 3inch single in and 2 1/4 dual outlets.
with the rev limiter kickin' in at 3200rpm it doesn't create enough "cackle" to suite me.
i've noticed the rev limit in low range too. that does makes a lot of sense to me actually.

it should sound a good bit more serious than the ticked off bumble bee sound of a fart canned rice rocket.
the main things i want tuned with the pcm will be throttle response, tire size, .......and the no load rev limit raised a bit.

[The Roadie]

hobbstisdaman why is this the wrong forum?

He meant what a lot of us are thinking. This may be a GMTNation.com issue, since it's not really an activity we do for OFFROADED trucks.

this is truck discussion ain't it?

Yes, but remember the mission we're focused on here at ORTB.

or should it have went in troubleshooting too? my thread about a growlin' noise was moved there. sorry, i'm a noob! it'll take a bit to get used to this forum.

The culture of the forum is a bit more than starting threads in the right area. It's also about thinking: "Is this an OFFROADING sort of issue?"

the roadie and gotspeed1, by power goodies i meant engine modifications, performance enhancers....... whatever else you want to call gettin' more power out of it.

We're not dumb. We just don't get why you think you need to spend money on them. In 4LO, I run out of traction or ground clearance FAR before I run out of torque. That's what we think about in this OFFROADING forum. See the common item in my replies? Are you already full-up on recovery, communication and emergency survival supplies for aggressive offroading?

back on the topic.......
yeh, the only reason i want to remove the rev limiter is the exact reason chevycrew mentioned...... i like to crack the loudpipes open once in a while! (read that as all the time!)

OK, now (if you're not being sarcastic) you've got me pissed off. Chevycrew was, of course, being sarcastic. Making excessive and unnecessary noise on a trail is just plain impolite, annoying, and shows a complete disregard for the Tread Lightly principles. Ever heard of them? Making noise in neutral is a juvenile thing.

i have plans for a 40 series flowmaster with 3inch single in and 2 1/4 dual outlets.
with the rev limiter kickin' in at 3200rpm it doesn't create enough "cackle" to suite me.

I would disinvite you from any trail ride I'm leading if you did that shit on the trail. Grow the //// up.

i've noticed the rev limit in low range too. that does makes a lot of sense to me actually.

You ever USE 4LO? Where 4HI just doesn't get you through? On a real trail?

it should sound a good bit more serious than the ticked off bumble bee sound of a fart canned rice rocket.

Why does it matter what it sounds like?

the main things i want tuned with the pcm will be throttle response, tire size, .......and the no load rev limit raised a bit.

[HARDTRAILZ]

Wow

[trailburner]

yeh.... wow. ......and ouch!
i'll try to be more careful about what i post from now on.

i had a double lung transplant may of 2011 and i'm just now gettin' around to doin' things i've been wantin' to do but never could.
i reckon i am a little outdated on the current trends in offroadin', but that's one of the reasons i picked this forum.... and not the "other".
i never realized that i would rub everyones fur the wrong way with my comments.
i am serious about off roading. i live out in the country, in ohio. "off roading" is unavoidable in the winter and spring.
we don't have that many trails, and the rock climbing stuff is pretty much non existant in my area..... mud holes and deep snow is what i run across the most.

i want to learn from you guys. i'm an old school hot rodder/4 wheeler that has a lot to learn.

i guess my question has been answered, and i thank you.

my appologies for the mindless rambling.

[06MidnightBlue]

The best thing to remember here is that we are not into performance (horsepower) gains.

Sure some of us change our intakes, tunes and other tidbits, but that is only to increase our off-road capabilities. Even our V-8 brothers don't do much to their rigs, even though the aftermarket for the 5.3 is MUCH larger than the 4.2.

From my trial an error here, the main focus of offroadtb.com is solely that of off-road modification and exploration.

If horsepower gains and modifications is more to your liking, then I would suggest GMTnation.com as a more suitable site for your discussions.

[trailburner]

Thanks for the heads up. Lesson learned!
I'm still gonna hang around this forum, but I'll promise to keep my hp performance mods to myself ....or at least keep them in the right forum!

Thanks again and Sorry everyone!!!!!

[hobbstisdaman]

Just some insight maybe. I know it's all opinion based, but "revving" up the 4.2 with all these fancy mods will sound like a 650cc Crotch rocket. Unless that's what you're into

[bartonmd]

Just some insight maybe. I know it's all opinion based, but "revving" up the 4.2 with all these fancy mods will sound like a 650cc Crotch rocket. Unless that's what you're into

That is what I'm into, and it sounds nothing like that. I personally think a loud I6 sounds like somebody trying to hum a note while throwing up.

Mike

[navigator]

I get some folks like a little rumble in their exhaust, I like the sound but I want my stuff quieter not louder.
I don't want to trigger any dogs barking or wake anyone's kids or disturb any wildlife.

[trailburner]

I want to open the exhaust more for the efficiancy benefits than the sound of it. I know I carried on like a school boy about having a loud exhaust but that's not really what I'm all about.
I've seen power and efficiancy gains in everything I've owned by opening up the exhaust. A 40 series flowmaster isn't that loud on an inline 6. ....even when split into duals out the back. It sure helps it breath better.
I'm just gettin' started on this thing and I'm lookin' for some potential direction to go with it.

I appologize for rufflin' everyones feathers

[The Roadie]

OK, after a good night's sleep (I'm in Korea on business at the moment), I apologize for being so harsh. I've been moderating forums for ten years, and have dealt with a LOT of idiot kids, and it seemed you were coming across as one and that's one of my hot buttons. Stereotypes are bad.

That said, I tried a new muffler once. Had a Flowmaster 70. Hated it, especially when in a narrow desert wash, maybe 8 feet wide with 5-10 foot walls. Reverberated like crazy into the truck. Can't imagine what it sounded like to the lizards and rabbits. I try to keep others from making the same expensive mistake I did. Went back to a Wagner that's the same size as stock.

On trailvoy, people discussed Flowmaster 40's and 50's, and many old farts like me can't imagine trying even a 50. I heard one at a meet on an I6. A 40 would have a drone on the highway that would drown out your audio if you didn't play it at eardrum-damage levels.

If you live in the country, you're not waking your neighbors up, but I'm in a section of town with hilly 1/2 acre lots, and if I light up a loud exhaust at 3AM to go the airport for a trip, I feel a bunch of guilt. I know *I* sleep lightly, and with the windows open, and I get woken up every time a neighbor three houses away lights up his Harley when he has an early shift driving a bus.

Please forgive me for snapping, but I'm serious about the Tread Lightly thing.

[06MidnightBlue]

Just some insight maybe. I know it's all opinion based, but "revving" up the 4.2 with all these fancy mods will sound like a 650cc Crotch rocket. Unless that's what you're into

That is what I'm into, and it sounds nothing like that. I personally think a loud I6 sounds like somebody trying to hum a note while throwing up.

Mike

How extremely vivid Mike, thank you.

[JCrayton99]

Just for curiosities sake, how would a 40 be compared to a glass pack?