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ChissumMc
Dodge Dakota
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6/05/2005
14:34:59
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 Subject: 4.7L Redline
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I know the engine Cut off is 6000, and that it gets its power at 4800 Rpms, now, I have a 5-speed, and the other day I accidently took it a little past 5000 rpms,
as long as it is not an everyday basis, will that hurt my engine?
everyday I drive my dak, I probably give it half throttle, just because I am in a hurry,
and I take it to about 3500, then shift,
I don't WOT it everyday,
but, what would you all advise on shifting?
what is the redline on the 4.7?
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Mason
Dodge Dakota
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6/05/2005
14:44:31
| RE: 4.7L Redline
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There is no real "redline" indicator on your tach because the engine rpm limiter takes care of that.
5000rpm shouldn't hurt it.
3000rpm = 50 revolutions per second.
5000rpm = 83 revolutions per second.
6000rpm = 100 revolutions per second.
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DanK
Dodge Dakota
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6/05/2005
14:51:32
| RE: 4.7L Redline
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HP and torque curves cross about 3500 RPM. That's a good shift point.
http://www.wjjeeps.com/misc/curve_47.jpg
Read more on the 4.7L engine here:
http://www.pera.org/CoreTalk/eb100320.htm
and here:
http://dodgeram.org/tech/gas/Cammer/4_7_v8.html
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ChissumMc
Dodge Dakota
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6/05/2005
18:38:44
| RE: 4.7L Redline
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thanks for your input guys,
keep on truckin'
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ricardcapecod
Dodge Dakota
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6/05/2005
23:00:46
| RE: 4.7L Redline
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Depends on how many miles you wanna go w/ one gallon of gas, how quick you need to gain speed etc.
If you want to be economical, don`t go beyond 2000 rpm. The 4.7 is a torque oriented engine and you will find a good amount of power on the lower side of the tac.
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DanK
Dodge Dakota
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6/05/2005
23:54:56
| RE: 4.7L Redline
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I Have the 5-45RFE automatin tranny, 265/70-16 (31x10.5-16) tires and 3.55 rear gears, and I can go more miles at 60mph with overdrive off and the engine turning 2300rpm than I can with overdrive on at 60 with the engine only turning 1600 rpm and having to work harder to maintain speed.
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Old Fool
Dodge Dakota
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6/06/2005
07:17:48
|  RE: 4.7L Redline
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I have an '02 4.7L and it turns to 7,100 RPM before the rev limiter kicks in. When stuck in bumper to bumper traffic I will run it all the way to 7,100 RPMs in 1st and 2nd to keep from up shifting and down shifting a lot. I've been doing this Since I picked the truck up new Feb of '02. Engine isn't hurt yet. I shift it when I race at 5,500 RPMs, just as it starts dropping power band. The overhead cam design allows for many more RPMs than the old pushrod motors, so if you feel so inclined, Twist it Up.
Later,
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BillyJack
Dodge Dakota
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6/06/2005
09:52:22
| RE: 4.7L Redline
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I am afraid to take my dak to 7,000, that is the end of the line, on the RPM gauge,
that is just crazy,
from my experience, sports cars can only do that kind of stuff.
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dmould
Dodge Dakota
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6/06/2005
12:46:15
| RE: 4.7L Redline
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My 2004 is rev-limited to 5800 rpm. For max acceleration, I shift at about 5200 rpm, as the power really drops off after that. According to the graph at wjjeeps.com, the motor is making 260ft-lb of torque by 1500 rpm - wow!
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Kowalski
GenIII
6/06/2005
16:40:31
| RE: 4.7L Redline
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Redline on my tach is 6000, so a bit over 5000 is definitely no big deal. 4.7s make good power up top; not just a low rpm torque motor. That may explain why some say they get better milage without OD - something I've always been skeptical of and never tried; but the slight milage increase I've recently seen going from 3.55 to 4.10 gears would seem to back that up.
Lead, follow, or get out of the way
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Old Fool
Dodge Dakota
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6/06/2005
19:37:33
| RE: 4.7L Redline
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Well my neighbor in Colorado used to call my truck "A Tall Car With A Big Trunk". So maybe it is a sports car. It doesn't even notice 7,000 RPM.
Later,
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GraphiteDak
GenIII
6/08/2005
21:34:30
| RE: 4.7L Redline
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It don't turn 7,000 RPM's UNLESS you had serious work and PCM mods.
I know KRC publishes like 450 HP AT 6800 RPM's on a HIGHLY MODDED 4.7
Otherise, yours shuts off at about 6000 RPM's like mine and everyone else does.
BTW. I've ran up to my rev limiter many times. I'm not worried.
This engine has chain driven OHC and a fairly bulltproff bottom end from what it looks like. These engines even have bed plates, the main caps are all one piece vs. how old school 5.2/5.9 etc are.
Duner threw a rod on his 4.7
But his waste gate stuck on his turbo and he ran it VERY lean at over 20PSI boost under full throttle a few times before he realized why it sounded like loose change running inside his engine!!
He STILL made it home before it broke. Most engines would not have survived that far.
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Old Fool
Dodge Dakota
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6/09/2005
00:06:18
| RE: 4.7L Redline
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Yup, SOME mods and the KenneBell Optimizer II PCM Upgrade. Speed limiter moved WAY up, and the Rev Limiter Moved to 7,100 RPMs.
Later,
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GraphiteDak
GenIII
6/10/2005
01:56:30
| RE: 4.7L Redline
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You say SOME mods.
You have aftermarket valve springs in them heads?
Or are the STOCK ones actually NOT floating at them RPM's???
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Old Fool
Dodge Dakota
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6/10/2005
20:53:09
| RE: 4.7L Redline
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No after market Valve springs. Here are the 'Some Mods'
F&B 70mm T-body
KenneBell Optimizer II
JBA Shorty Headers
True Duals
IAT Relocated
Intense Performance Z-Tube Intake
Viscus Fan Removed
HO Cams
3rd Cat removed
All Stock internals and bottom end. No valve float. 14.51 @94 1/4, 4,000 RPM Clutch dumps with 1.89 60' times. 625 trips down the track on file, with factory original clutch, rolled over 69,000 miles last weekend. 4,000 pounds dead on race weight with me in the seat.
No problems yet, 17 mpg city, 23 mpg highway.
Later, 8)
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Duner
Dodge Dakota
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6/10/2005
21:16:46
| RE: 4.7L Redline
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Old Fool: WOW! Was that 14.51 at Bandimere Speedway? A 14.51 @ 94 mph pass at Bandimere would be more like 13.50 @ 101 mph if it were run on sea level track. BTW... the truck looks awesome!
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Old Fool
Dodge Dakota
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6/10/2005
23:15:02
| RE: 4.7L Redline
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Duner, I will not tell a Lie, I ran mid 15s at Bandemere 5800', From 15.45 to 15.7 :( . The times posted are from San Antonio Raceway 600' where I live now.
Thanks for the Kudos on it. How is your rebuild project coming along? I have this truck on the back burner till I get my '93 Stroker truck finished. Then me and my son are going to do a 5.9L HO Cummins Turbo Diesel in this one, and put the 4.7L in a 280Z or a 300Z. I will build it to a reliable 400 hp for the Z.
The '93 I'm building is an old 360ci 'A' Motor from a '75 Cordoba. I have the Eagle 4" 4340 Chromemoly Stroker Crank, Eagle 'ESP' H-Beams, JE 12.1 to 1 Flat tops 4.030 floater pins, JE File Fit Rings, Pro Race SFI Damper, Hughes Engines 1.6 Billet Shaft Roller Rockers, EdleBrock RPM Heads Stage III P&P 2.02/1.6125 w/58cc chambers, Comp Cams True Double Roller Timing Set, Comp Cams Extreme Energy Hi-Lift .564/.564 cam with 251 and 257 Duration @ .050, Mechanical MSD Distributor, MSD 6AL with a 2 Step Box, Mezier Electric Water Pump, Edelbrock RPM Air Gap Intake P&P and matched, Clevite '77' Bearings, Melling High Volume oil pump, Holley 850 Double Pumper reworked w/no power valves larger jets to compensate and choke flange removed, Hooker long tube headers, Milodon 8 qt oil pan and pick up, Local Built 727 TF Stage III w/manual Valve Body, Hughes Transmission 3,000 RPM Stall, Hughes Transmission SFI Flex Plate, Full Comp Engineering Ladder Bar w/the 9.25 Chrysler Corporate rear end and Coil Overs, 4.10 gears and the stock Trac Lok as long as it will hold up.
This is a recipe for fun I hope. Especially since I have lightened the truck to just at 3,000 lbs with the stock v-6 and 6 point bar.
Hope to hear about your new build soon.
Later, 8)
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GraphiteDak
GenIII
6/12/2005
15:40:39
| RE: 4.7L Redline
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I was going to ask the same thing about "Rocky Mountain" and the altitude difference from here. Like Duner said, that would have been quick as hell if that was your time up there, at a mile high!
But STILL very nice to see what you have done with a 4.7
So out of YOUR mods, what is it that has allowed your truck to breath so well above 6k RPM's? I've wanted to move my rev limiter up, and ppl say I'm crazy. I guess the diff springs would not be needed unless you went with quite a bit more valve lift than the HO cams (which are close to stock I think).
Duner, Where you been? Don't see you here very often.
Any races coming up by me (SpeedWorld) or at Firebird???
The last one I went to, you weren't there :p
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