Engine/Transmission (1994 - 1998) Top Speed

[Tomahawk]

Looking for more top speed. With my #12 plate all the way foreword I can get to 96 mph fairly quick before she cuts out. What controls the top speed and can it be bypassed or adjusted????

 

[NMongeau]

Thats odd. My truck still pulls hard at 110. :-laf

 

[boondock]

WHats you tire size? I bet you are at 3K or a little higher.



Mine will make it to 105 or so but 285 are going on soon then it should be 113 or so.

 

[d906670]

Mine was at 120 before the prety blue lights told me stop.

 

[RBrunson]

Before I installed the 3k spring kit in my 96 it would do 94 tops. After installing the kit it did 107mph on stock size wheel, 3. 54 rear ratio.

 

[ata]

Before I installed the 3k spring kit in my 96 it would do 94 tops. After installing the kit it did 107mph on stock size wheel, 3. 54 rear ratio.

Ron, That's way to fast for an OLD RETIRED guy like you.

 

[RBrunson]

I know, but sometimes I slip back into my childhood days.

 

[Desperado]

Mine will do 91. 28mhp in the 1/4 mile in 4th gear. :--)

 

[Justin1889]

Mine was at 120 before the prety blue lights told me stop.

I am highly doubting that one.

 

[BTighe]

Mine will do 91. 28mhp in the 1/4 mile in 4th gear. :--)

yeah, and its smokes a little too. :-laf were you chirping the tires going into 4th?



i can get to 90 but 1500* is to hot for comfort. you need a gsk

 

[Vaughn MacKenzie]

My '96 with stock tires tops right at 100 even. No GSK.

 

[TurboTweaker]

my 98. 5 24v will run over 120 on the street and i have seen it as high as 135 on the dyno at 4000rpm. had a buddy out run a BMW today at 128 mph on the freeway. it can be done guys.



The Fat Kid

Andy

 

[Tomahawk]

Still running the stock 245/75R16 tires. It pulls real hard until it gets to 96 mph and it's like the fuel shuts down to slow it down. I know most production cars have a computer that limits top speed, is there something in the ECM that might limit speed on these trucks?

 

[Vaughn MacKenzie]

The highest I've heard of someone driving their Cummins on the highway was 135mph, per GPS, in a 12v 4x4 dually! If I recall correctly it was Ted Jannetty or one of his friends. I think the truck had an OD unit.



Vaughn

 

[ndurbin]

I'm with Vaughn, even 100 w/o a GSK (and that was before all the BOMBs).



Nathan

 

[BTighe]

when the motor was stock i went to the salt flats and played around there. took it up to the max 120? it took forever and had no power though.

 

[biggy238]

To the first Post: 12 Valve cummins engines are only limited in rpm by Governor Springs. Search for that and you will find more than you could want to know.

In stock trim, Your engine could stop recieving full throttle at 2100 rpm (not all trucks are the same on this) After that point you can't really get faster easily(without a hill)

Also at some point the fuel plate will stop devilering enough fuel for you to get faster, even if the engine can turn that fast.



Now, My 96 in stock trim and 35 inch tires and levelers ran 115 on the level. It took 3 miles to get it from 55 but it did do it. I think that matches Vaughns claims pretty accurately. It started to defuel a long time before it just quit getting faster. The last time I tried it I ran out of road so I only hit 100 but I think my transmission isn't in tiptop shape for it now that i've got the plate pushed.

 

[NMongeau]

I'm runnimg a 305/75 R16 tire. I wouldn't be suprised if it was Ted. His truck is built heavy.

 

[hsmith]

80mph at around 2k. Someone else will have to drive it and tell me what top end is.

 

[Bob4x4]

129 on the gps in the nevada desert with 4k's and 315 tires. Not for the faint of heart. Pyro pegged.



Bob