Engine/Transmission (1998.5 - 2002) Blue Chip stacked w/ Drag Comp & Bigger Injector Questions

[SConklin]

I have an Edge Drag Comp right now, and I would like the features of the FMS - especially the EGT cutoff. I do not have a problem with EGTs yet (max at WOT is about 1250 pre-turbo), but I would like to run bigger injectors (I have DDIII's now w/ a PDR HX-40).



Would it be possible to stack the Premium FMS with the Drag Comp as the timing box? (I do not want to buy a new EZ if the Drag Comp can do the same timing job) Or would the fueling be way too much, no matter what the comp is set to?



Stacking aside, if timing were my only extra consideration when refering to the FMS...

Would I be able to run bigger injectors, and just rely on the FMS to manage my EGTs, or is that a bad idea? Does the FMS defueling for EGTs kill power fast, or is it gradual, so that you still have power on tap, just less? (Basically, would I get more power/speed with the drag comp and DDIIIs dumping all-out with the max safe egts that I have now, or stage 4 or 5 injectors and the FMS managing the higher egts through defueling?)



And, I have to ask, just for the sake of argument if nothing else...



All other factors equal, would a FMS/EZ combo (or the comp instead of the ez if the stacking mentioned earlier were possible) provide more power overall than a Drag Comp alone? Or would the switchover put me worse off?



Thanks!

 

[nwinters]

I don't think you can do the EGT cutoff of the FMS while running a Comp box that is fueling, the FMS is a fueling box and you wouldn't want to have 2 wire-tap boxes running at the same time. (I don't know if you could)

The only advantage I can see to that setup is you could get the less than stock fuel delivery for less smoke while running the Comp as a timing box only (no pump wire) and fueling with the FMS. I have done this, it will work. I sold my Comp though and just run my FMS. I have a VA box that I slap on if I go to the drags. Otherwise I like the feel of just a fueling box, no timing.



FMS defueling can seem gradual or fast. It depends on how hard you are dumping in the fuel. If you have it set at 63% (full) you will take off really fast, heat up really fast, and defuel really quickly due to quick heat buildup. If you set it at 25% or so you don't build heat as fast, and it will not defuel as quickly. I have mine set so that it provides no extra fueling once it reaches 1300deg, it starts to defuel at 1200deg. Doing this, it usually defuels right at redline in 3rd.



I've never run a drag comp, so I don't know how that feels. I do know that the FMS with a VAcompared back to back with my standard comp fueled quite a bit more. I decided for myself to keep the FMS and sell my comp.

Here's a pic of how I ended up installing my FMS, other photos of it are in my gallery.









#ad










I ran the buttons down to my switch panel.









#ad




Nate

 

[SConklin]

That's a really nice looking switch panel and screen setup for the fms. Did you make all that yourself, or did you buy it from somewhere? I could use a switch panel like that.



Do you think that using the FMS would allow me to run bigger injectors? Or would that be a bad idea to rely on the FMS to defuel all the time?

 

[nwinters]

I made the switch panel myself, its CNC machined from a block of ABS. I made it so it actaully holds the radio somewhat like most aftermarket adapters do. The overhead FMS mounting I made my self as well.

I run DDIII's with HX35W-14 and straight pipe exhaust. It gets hot really fast and I do rely on the FMS to defuel for me, it really depends on where you set the FMS fueling level. I have a 4" exhaust coming, hopefully that will cool things down a bit more till I can do some turbo stuff.

Nate

 

[Amianthus]

Yes, it can be done.

What you have to do is disconnect the fueling wire from the Comp and connect the fueling wire from the FMS. Leave the datalink connection alone.



You then connect the FMS to the MAP sensor and then the Comp to the FMS harness. Then you connect the truck harness to the Comp. That will allow the Comp timing module to function, but the FMS will control the added fueling as you program it to.



Although, it would probably be easier to just buy the EZ and sell the Comp. I don't think you'd have a problem unloading it.



nwinters, that's a pretty trick setup for the FMS. Now, you've got me thinking on how I can accomplish something like that. Darn your blackheart!

 

[HoleshotHolset]

That switch panel and overhead console work is awesome..... VERY cool.



Have you ever thought of making a few extras and selling them to your fellow TDR members? I bet more than a few would buy them... ...



Matt

 

[jrandol]

Id be interested in one if it were to fit my 02. That gauge holder is sweet!!



Jeff