Top Speed Limit

[jaybo]

My friend Daniel who is not a TDR member YET has a bombed 2001 auto. We just put 275 injectors, TST box, and an HX35-16CM turbo on it and it goes like **** . Problem is it won't go over about 93 mph in overdrive. He had an aftermarket change from 4:11 gears to 3:54. Dealer is dumbfounded (!) but not smart enough to help. It goes up to 3200 rpm in 3rd. Does anyone know if the PCM or ECM uses MPH input to cause defueling at some Top Speed defined by the Almighty?

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Jay Bennett Jay Bennett's Home Page

 

[HVAC]

Jaybo, Performance Diesel has top secret information regarding your inquiry #ad


I'm a little confused as to your performance parameters. You mentioned 3200 rpm's in 3rd. What is the rpm level at the 93 mph max figure in overdrive?

 

[MCrossley]

heck at 115, I was still accelerating!

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TAZ... 2001 2500 SLT+ 4X4 Auto ETC Cummins, LSD 3. 54,Quad Cab, Long Bed, Agate Leather, White/Driftwood Exterior, Sliding rear window, Camper Special Group, Towing Group, Cab clearance lights,SPA-Technique Digital Dual Gauges (Pyro/Boost, Trans pressure/temp) Aux. Backup lamps. BNM 5th Wheel Hitch, Additional Body Molding on Bed. BD Torc Loc, BD Pressure Loc, Line-X bed-liner. DTT's TC & VB, Pac Brake, Power Edge, Edge EZ, Grover Air Horns

2000 32' Aljo Triple Slide 5th Wheel.

http://www.ramtaz.com

Add on's to come: any other Ram Runner required modifications...

 

[Joe S]

with VA alone and 3:54's I can hit 100 like it's nothin'

 

[David_VT]

Have not yet found the top end of my 99 using the foot pedal. (but the cruise control kicks out in the 80's)

There is a BMW wagon up here somewhere who might be a hostile witness... . #ad
#ad


God I love watching folks keep looking into their rearview mirror when they can't seem to loose this big Green pickup truck behind them. Fools always try to loose me on uphill grades...

(Thanks DD and PE for making this reckless and foolish 'ism' possible)

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99' SB 4x4 : DDI's, HOT PE, SPA dual gauge, ESPAR, Line-X OTR, Ladder bars, AMSOIL, etc (GPS,Cell,CB,... . )

 

[My 6 Eats V8's Old File]

since I don't have those pesky electrons limiting me I've seen 143 on the dyno #ad
:0 #ad

 

[Vaughn MacKenzie]

Mine does 110 pretty easily, but soon after that the ECM starts reigning in the fun because I'm approaching redline. At 118 it was pretty much out of steam #ad


I recall some time ago Ted J posting he took his dually 4x4 to 125mph, thanks to his mods and GV overdrive #ad


Of course these velocities mentioned were acheived on certified closed tracks with full 5-point racing harnesses and helmets and VR rated tires and . . #ad


Vaughn

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"Blue Thunder" & NW BOMBers
'01 2500 QC Shortbed 2wd, Patriot Blue over Driftwood, HO 24v Cummins & 6-speed, 3. 54LSD, Cab & Fog lamps, Camper & Tow Pkg.
BOMBings: RV injectors, PS Boost module, Amsoil air filter, straightpiped exh. , SS fuel lines, debadged body, AutoMeter Sport Comp gauges, Amber turn signals, 55w halogen rev. lights.

 

[KWIKKURT]

My 2001 runs up to 115. . then it stops there... the pull that it has over 100 feels like it would hit 135/145... Let me know if you learn how to defeat this Wall...

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"Have you driven OVER a phord lately"
2001 2500 BRT WHT SPORT QUADCAB 4X4 ETH 3. 54LSD TRLR CMPR PKG ALL OPT XCPT LTHR

 

[JyRO]

Mine is totally stock (see signature) and it was still accelerating at 105. The only reason I let out of it was I had 2 dogs (in a crate) and luggage that I was afraid might blow out. I calculated through the transmission ratio, rear diff ratio, and tire diameter that my truck should do about 118, like Vaughn MacKenzie said his did.

A guy in a Jetta was following me but I don't think he could've hung with me if I had nothing in the bed, he didn't stick too close at 105. He might've just been worried about having a dog doing this #ad
on his windshield though.

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Y2K 2500 Cummins ETC/DEE, SLT+, 4X4, Quad, LB, Intense Blue Sport, 3. 54 anti-spin, rear aux. springs (camper special), sliding rear window, all options except cab clearance lights including agate leather, totally stock, some ring fell off, whistles louder since & D/C must have screwed up on the wiring cause the fogs stay on with high beam. Since everybody else listed their toys, I will too.
1995 Kawasaki ZX6-R (For Sale)
1990 Toyota Celica
1983 Mazda RX-7 GSL (For sale)

 

[jaybo]

Thanks everyone... To answer a few questions,
the truck in question 'hits the wall' at 2600 rpm, about 93 mph. It red lines easily in all lower gears. It occasionally 'shudders' at 50mph (1400 rpm) on hard acceleration almost like rapid repeated on/off of the power, lasting only a second, then resumes acceleration. This problem is not necessarily repeatable and is intermittent. Dan thinks the problem may have been there all along but he only is noticing it now that he is into bombing it. The truck is scheduled to go to the dealer early next week; the dealer now claims to be able to do something about the top speed wall! More later...

 

[RobbyRam]

Before the two Dodge reflashes, I could hit 100+mph in a driving rain, but since the ECM and PCM reflashes, I have more 'get-up-an-go' from the line, but max out at about 95 mph's.

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Rob in Sacramento
Y2K All Black 3500 ISB 4x4 4:10 LSD,Auto,QC,SLT Laramie, LB, Polished Stull Billet Grill & Fog inserts, Chrome Smitty Built Step Rails, Mopar Chrome-Tipped Mud Flaps, A-Pillar mounted Turbo/Pyro/Trans Temp gauges,21-20-99 & 18-24-99 Computer Re-Flash,Weatherguard 'Weekender' Ladder-rack,Rancho 9000's(the best upgrade I've done so far),Diamond Plated Tool Box, OEM U. R. Bedliner.
I plan to 'BOMB' only after my 100k mile warranty expires Fact:"The First Fords' had 'DODGE' Engines-The Last Fords' NEED THEM!"

 

[DHatfield]

The most I can run mine up to 115 MPH and that was only once as I think that is a little over the legal speed limit around this part of the country.

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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.

 

[jaybo]

The following is from Mark Chapple:

Subject: Speed Limit on 2001 Ram Diesels
Date: Wed, 15 Nov 2000 23:31:21 -0500
From: "Mark@TST" <tstproducts@iquest.net>
To: jaybo@pacbell.net

Jay,

There is a speed limiter built into the 2001 Ram that is supposed to cut off
fuel at 112 mph. It must also sense fuel flow in some manner as we've found
with the PowerMax turned to a high setting the speed limit drops a lot.

The way we fix it is to simply disconnect the vss signal wire going to the
Cummins ecm. There is a multiwire connector on the firewall above the fuel
filter that has a white wire with orange stripe. We simply unplug the white
wire with orange stripe and the speed limiter doesn't function. There have
been no adverse affects on local vehicles though California vehiles may give
a fault code.

Let me know.

Mark @ TST

 

[BPINE]

Hey Jaybo did the above recommendations fix the problem?

 

[jaybo]

(To Mark Chapple)
Mark:
Thanks for the info and pardon the delayed reply...
The client, Daniel Allen, (uses your box at my recommendation) tops
out at 92 mph. DC is no help and threaten to void his warranty if
we push harder, we said we don't care about warranties just fix it and
they still won't help. They refuse to ride in the truck over the speed limit! WOW!
Anyway, we cut the wire in question (a #20 White/Org tracer), the
VSS lead between the Anti-lock controller and the PCM and the truck goes like **** ! Trouble is the speedo and odo quit working too! Although there are no MIL's or trouble indications, it must be a felony by now to
disable the odometer... so now it has a switch on it!
Sincerely,
--
Jay Bennett


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Jay Bennett Jay Bennett's Home Page

 

[HVAC]

Pull over son... your under arrest!!! #ad
#ad


We got another youngin' over your way Jaybo. Guy lives in Scott's Valley. You need to brush up on your first generation skills #ad

 

[Vaughn MacKenzie]

Someone needs to invent a speed sensor module, limit the signal to 90mph #ad

 

[jaybo]

Thanks to Mark Chapple:
Clipped the white/orange tracer wire about 2" out of ECM connector pin 43. This kills the VSS signal to the ECM and eliminates top speed shutdown in the 2001. This wire doesn't exist on prior model years.