Would the Vortech FMU and a new fuel pump be adequate to feed me if i were pushing say 6 psi? I want to be safe, but $400+ for hondata is a little much. Would i be ok with the FMU, fuel pump and a missing link? And of course the piping, manifold, wastegate and b.o.v. Just want to know before i start a summer project. Thanks.

 

The vortech fmu is definately good for low boost levels... i had it on my lude boosting about 10psi b4 i changed it to the comtech unit which i am currently runnin about 13.5psi on... but the vortech is a very good unit for the money... if your ever gonna boost any more than 10psi get a better fmu but for what you wanna do it should be fine...

 

The Vortech FMU is ultra reliable, I have personally never heard of anyone experiencing a failure or an FMU. I ran my car for 2 years with stock injectors and FMU and a Holley FI pump, it ran pig rich under boost.

The Hondata was the best investment I've made for my car..worth the money.

 

Any one use the comptech fmu?

 

I have the Comtech FMU right now on my Prelude... Best FMU for the money id say...

 

So as far as fuel management goes, FMU and fuel pump are adequate. Am i correct? Thanks for the replies.

 

dont cheap out on something like this...go Hondata, you can thank me later

 

Your question was is the FMU reliable. Yes it is..in terms of mechanical robustness...it probably won't let you down.

In terms of adequacy..that's in the eye of the beholder..it is a very crude way of providing fuel under boost.

Pros:

- always forces more fuel into the engine under boost (if you believe in "rich is safe" philosophy
- reliable (mechanical failure of unit is rare)
- cheap cost of unit
- quick easy install

Cons:

- rich during transition (when manifold pressure goes from vacuum to boost)
- crude fuel calibration (ratio not tuned to individual setup)
- does not give proper fueling during closed loop operation
- overloads the injectors (too much pressure - will cause injectors to wear)
- overloads the fuel pump (too much back pressure - will cause pump wear)

In the end, you are going to need standalone, but if used right the FMU will help you get through until you are ready to buy one..just be careful..

 

I would have to agree with you there. I got mine for free. h:

 

Sensei got it right on. The actual mechanical quality of the FMU is certainly good, but it's far from the most precise method of adding fuel to match boost.

If you don't want to spend the money for a Hondata you can go the DIY route and use Uberdata. It does require some skills with modifying a circuit board but it's not overly challenging.

To go with that you can get a set of 450 cc/min injectors from a turbo DSM, the injector resistor box from an '88-'91 fuel injected Honda, and a Holley 12-916 fuel pump (Walbro 255 lph is a repackaged version of this) and be set.

In the end you probably won't spend any more on the supplies to convert your ECU and the injectors, than you would on the FMU and Missing Link.