Competition Took The PLUNGE

[mavrick01']

I decided to cut the rev limiter wire. I noticed a big diference in top end pulling. It seems to pull harder. If anybody else trys this please tell me. I'm just interested in how other trucks respond to this mod.











Are you shure I was doing 120 Officer :--) :-{}

 

[HVAC]

You Mean

Are you talking about the speed limiter? White wire with orange trace? I think that wire may be associated with the ABS system and the speed sensor. It is supposed to let you exceed 120 on the speedo I believe. Maybe it eliminates some defueling as you get near 120 as well.

 

[Vaughn MacKenzie]

I am curious what wire too. Mine defuels majorly by 115, should do 122 before reaching RPM cutoff.



Vaughn

 

[E7mack96]

as I have asked before??

Mine defuels at 99 mph. it really sucks,



How can we fix this?

 

[Gizmo 007]

I finally got brave and tried mine with the auto transmission tonight on the way home from work. It was still pulling really hard when the speedo quit moving Fast enough for me!

 

[lmills]

yeh, I put up a post about this last week. It might just have been a seat of the pants thing, but it definitely felt like it pulls harder on the hgihway with the wire clipped.

 

[mavrick01']

Thats what I thought

I am almost positive that it makes it pull harder. I just wanted to hear some feedback to verify that I am not going INSANE.

 

[curatchko]

Okay, I need some details here. You guys have sparked my interest.



What is the wire and where is it located?

 

[mavrick01']

The wire

This wire AKA speed limiter, AKA rev limiter is located on the driver side directly over the valve cover. It's the white wire with the orange stripe coming out of the male large connector attached to the firewall. GOOD LUCK

 

[24VChev]

rev limiter?

Are you guys saying that by clipping a wire we can rev the 24v ISB higher than 3400 rpm? Which wire is that one? and how much rpm is attainable then?





Thanks

 

[HVAC]

Your MPH

24vChev, what's your top speed?



FYI, interesting project, Cummins in a Chev. Pics would be cool.

 

[24VChev]

top speed

The Chev Speedo ends at 80 mph so will have to take it to the track to find out. I don't use the Dodge PCM so I am thinking that this clipping trick does not apply to me. Can find pics in readers rigs:



https://www.turbodieselregister.com/user_gallery/displayalbum.php?&albumid=590

 

[lmills]

Whatever you do, don't cut the one behind the air box. Trust me The one you are looking for is just to the drivers side of the center on the firewall. It is in a bundle of wires that are going to the ecm



heck I just realized you have a chevy, you probably wont have to worry about the wrong wire. In our trucks if you cut the wrong one you lose your speedo and odometer, guaranteed to set a code

 

[mavrick01']

Here is the deal

Put a switch in line. You need the switch or you will lose the cruise. When you want to take her up high. Just hit the switch. Mine runs like a raped ape now after 2800 RPMs doesent flat top any more.

 

[lmills]

Thats what I have been thinking about doing. I just haven't had the time to get it in the garage and it's been to cold to do it outside. #@$%!

 

[ToolManTimTaylor]

Re: Your MPH

Originally posted by HVAC

24vChev FYI, interesting project, Cummins in a Chev. Pics would be cool.

Both of you should check out Ntimadtr's truck

(94 Suburban Dually with an INSANE 12 valve on deck)



White W/ orange tracer ... ..... the same Pto wire? or did that cinderblock to the head really do something to me?

 

[24VChev]

Cool, another Cummins power Chev! Were can I see pics of NTIMADTR's truck?





Thanks

 

[ToolManTimTaylor]

If I see him I will try to either get some pics or have him post 'em.

 

[JHerrlich]

Well, out of curiosity, I clipped mine. My SOTP meter told me that it pulled a little harder, but I haven't had an occasion to really put it to the test.



I did find out about the cruise control thing. Another thing I noticed, was that my truck liked to chug at low speed (edit: engine speed) with the wire disconnected. It was a little temperamental at clutch engagement, too. Since I put the switch in, it's been back to normal.



BTW, put the truck in cruise and flip the switch off, full throttle cruise!! At least the cruise still turns off when you hit the brakes!