top end speed

[carrk]

My truck won't go any faster than 90 mph on top end. Is the engine rev-limited to that speed, or is there something else that keeps it there? The engine runs right up there and won't go any faster... but doesn't start cutting out or anything.

I don't drive it that way except this one time just to see what it would do, so it's not that big a deal. Just curious.

'99 QC 6 spd SB 4x4 with new VA box, straight pipe exhaust, stock otherwise.

 

[B.G. Smith]

I think the Governor is at 3200, if you have the 4:10 gears that is probably all you're gonna get. With the 3:55 they will go over 100,(I have heard).

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White 99 3500, QC, 3:55, auto. most options except leather, Line-X bed liner, fiberglass running boards Rancho 9000s, bug shield and window vents, black vented 5th wheel tailgate, 100 gal. aux. fuel tank.

 

[carrk]

I am running the 3. 54 ratio. It did stop at around 3200 rpm's on the tach. I really drive conservatively anyway; don't need to run over 70 mph. It goes fast enough to get me a ticket!

 

[B.G. Smith]

Don't soumd right unless the 6 speed OD is a lot diferent ratio than the auto. You should be turning about 2800 rpm at 90 mph. Mine is just under 2000 at 70 mph. Maybe your speedometer or tach is not reading right? bg

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White 99 3500, QC, 3:55, auto. most options except leather, Line-X bed liner, fiberglass running boards Rancho 9000s, bug shield and window vents, black vented 5th wheel tailgate, 100 gal. aux. fuel tank.

 

[JR2]

My 2001 Auto with a 3. 54 has been up to 115 mph and was not close to redline... I just chickend out.....

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John D. Rathert Jr.
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01 2500 SLT+ QC LWB 4x4 Auto 3. 54 rear end, Forrest Green Sport with all options avail DC Nerf Bars, DC Grill Gard, DC mud flaps, Line-X bed liner, Leer 160XL Topper, Power Edge, EZ Edge, SPA Boost/EGT Gauge on pillar mount, DDT's torque converter - valve body combo and 275 injectors.
4" Exhaust on deck. Air box mods and a new turbo in planning stages.

See My Truck

Dads truck: 98. 5 3500 SLT QC LWB 4x4
Brother Truck: 92 W250 SLT CC LWB 4x4 (Dads old truck)

See 5 Diesels and a Gasser
Winter fun: 2000 Skidoo Summit 700

 

[Dane]

Stock HO 6 speed - snorkle + Air Filter From Carl... 115 with some pedal left #ad
Love the way it pulls from 75-100 #ad
I can't fathom what you BOMBers can do #ad


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2001 HO 6 speed Regular Cab SLT 4x4 3. 54 anti spin 2500. Used for the daily grind and sneaking away to some secret Baja beaches toting a cabover

[This message has been edited by Dane (edited 12-16-2000). ]

 

[Chad Sheets]

My truck was clocked at 124 at 3am on a deserted stretch of road by my friend in his police car. I havent made my mind up yet if I liked the experiance or not in that big of a vehicle. I had a 99 C5 Corvette that I "bombed" and had clocked. It registered 147. It got traded shortly after that. They invented governors for guys like me I think.

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Always ready to help!
2000 2500 Red Sport quad cab, 4x4, K&N, DDI's, straight piped, boost, pyro and fuel pressure gages, Hot Power Edge, mean looking set of 33. 5" tires, Snap On diamond tool box, Marine Corps window sticker, Semper Fi!

1972 340 Cuda'. Original tripple Black, 340 car w/air. Good clean car, super stock springs, Weld Prostars, shaker hood, strong 340 with a 727/4000 stahl, 4. 56... . Bombs away!
NRA Life Member. http://www.geocities.com/chadsheets

 

[carrk]

So I wonder why my truck won't go any faster than 90 mph? It is running really well right now. I have a new VA box and a K & N air filter in it but otherwise stock (for now).

Any thoughts as to why speed would be limited on the top end? The truck gets after it while accelerating, so I don't think there is anything wrong with it. I plan on changing to 275 hp Bosch injectors and adding propane fumigation to the intake pre-turbo.

 

[Guest00]

If your engine is turning 3200rpm in overdrive at 90 mph your clutch is slipping big time or your speedo and or tach is way off. #ad

You have omitted one real important piece of info in this thread.
What rearend ratio do you have????????????

[This message has been edited by JNutter (edited 12-16-2000). ]

 

[FF1381]

I have the HO 24 valve 6 speed with the 3:54 ratio and I had to quit at 115 because it was starting to scare me, I never hit the rev limiter.

just a thought, I don't know if it will help you out any #ad


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2001 3/4 ton driftwood
24 valve HO 6 speed
Jason Shelby

 

[Bill Reiss]

my 3500 ETH/DEE with 4. 10's hit 100mph before I backed off (about 3200+rpm). I dont usually drive it like this, but it is very important (IMHO) to know exactly how fast you CAN go. You shoulda heard the turbo whistle inside that tunnel..... sweeeeet!

Bill

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White/Agate 2001. 5 3500, 4x4, 5. 9L HO/6-speed, Quad-cab, SLT+, 4. 10LS, camper & tow groups, factory tow-hooks, Bilsteins.

 

[Bill Lins]

People LOVE the truck!

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Bill Lins Wharton, TX 98 2500 QC SLT,12 (the CORRECT # of)valves,NV4500,3. 54 LSD,Manik grille guard,Semi-Psychotty Air,Amsoil everywhere, Reading aluminum utility body and bumper,Optima yellow tops- silencer ring & muffler stolen.

 

[Ross]

carrk:

Are you sure you're not driving a FORD?

Seriously, you should be able to top 115 with 3. 54 gears. Does your truck have an automatic or 5-speed? This is a stupid question, and don't take this wrong, but it WAS in overdrive right? If you were redlined at 3200 rpm, you couldn't have been in OD.

 

[DHatfield]

I have a HO Cummins/6-speed/3. 54 gears and my truck will do 115 MPH as well.

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2001 2500HD Quad Cab SLT SB 4x4, HO Cummins, 6-speed, 3. 55 gears, LSD, brightwhite/driftwood, 4w ABS, camper and trailer tow packages, HD transfer case, snow plow prep, group, cab lights, Isspro Boost and Pyrometer gauges mounted on A-pillar, 4" JRE exhaust, BD exhaust brake. 22500 miles as of 11/11/00.

1980 CJ-5, Modified for off-road use, bobbed fenders, 350 TBI, NP435 trans, 4. 56 gears, Dana 300, Dana 44 front, Dana 60 reverse-cut rear axle, ARB air lockers front and rear, 15/35/15 Super Swamper TSL on 10X15 steel rims, Cobra CB, Warn 9000I winch, nerf bars, 1/4" steel rock crawler bumper front and rear, jerri can/spare tire rack, custom roll cage.

 

[StakeMan]

I have a 2001 auto w/ 4. 10 an it will do 102 mph.

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2001 Flame Red Sport, Auto, 4. 10, 4x4, LOADED!, DC Sport Brush Gaurd, DC Painted Running Boards, DC Splash Gaurds, Line-x over the rails, BFG AT/KO 285-75r16

1998 Durango SLT+

2000 FL60, 16 ft. Flatbed, Cat Powered

 

[My 6 Eats V8's Old File]

Ok I'm not saying even I would like to go this fast on the road but on the dyno my truck went 143mph at 3600 in 5th gear with 3. 54's. #ad

 

[carrk]

I am going to do some serious checking on this. Thanks guys.

 

[B.G. Smith]

Carrk, when mine runs out of oomph I have found it is time to change the fuel filter. bg

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White 99 3500, QC, 3:55, auto. most options except leather, Line-X bed liner, fiberglass running boards Rancho 9000s, bug shield and window vents, black vented 5th wheel tailgate, 100 gal. aux. fuel tank.

 

[Jim Brewer]

One thing to keep in mind about top speed is that the speedos in general tend to be a bit "optimistic" at higher speeds. My Garmin GPS recorded a top speed of 105 when the speedo registered 112.

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2001 2500,ETC,Auto,Quad,Driftwood,4x4,shortbed,Blaupunkt RDM168 "Alaska",Planet Audio P706 6x65W amp,JL audio stealth sub,novice bomber,expert motorcycle roadracer, <URL=http://www.bigstickracing.com/>http://www.bigstickracing.com/</URL>

 

[SteveAZ]

Ran 118 for 8 to 10 miles on I-8 (Middle of nowhere AZ) Buddy of mine in his 00 PSD stop chuggin around 94. Hehehe (Gotta love that, he started it, I finished it!).

Was at the red line, seemed like it would go more, but I was governing myself at that point. Didn't try the cruise, heard it doesn't work above 85. (Not that you need it up at 100, anyway)

BTW: This was prebombed. Not expecting it go higher, just get there faster.



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99' Qcab, 4x4, auto, chrome nerf bars, VA, Boost elbow, DiProcal Pillar mount gauges,