Its from a vortech s-trim mustang. Its 12:1 and has ss fuel lines with it. I understand it see boost with the vacum line and raises fuel pressure but how does it work and what does the 12:1 mean? I'am going to run the fuel pressure way up for my twin turbo setup on my iroc will this work? Can i change this ratio?

 

yes you can change that ratio with the $30 ratio kits they offer, it is a good FMU, the one that I like.

 

B4Ctom1 or anyone else, have you ever measured what they change with the different calibration kits? I've never looked inside one but I would guess it would be the diameter of the disks?

You can usually find them used for $30-50, if you're going to go that way, it kinda sucks to pay another $30 to get it calebrated right.

 

Im looking at this one http://www.cartech.net/fmu2020.htm

 

It means for every pound of boost, you will raise your fuel pressure by 12psi.

The Procharger FMU's have an adjustable air bleed that make their FMU's fully adjustable.

 

http://store.summitracing.com/partdetail.asp?part=26678

$800

Will see up to 3 bar map, not tooooo much more than a nice FMU, and the ability to tune the car properly.

Im going to get the LT1 system

 

Now that's pretty cool... for an OK price, especially if it comes with a harness.

Now does anyone remember why people were bitching about the Commander 950? I know that there is some limitation in it's programming that some people are butting their heads against...

 

Absolutely the comander 950 is the most affordable system for aftermarket ECM but, an FMU is only a hundred or so.

 

<b>Now does anyone remember why people were bitching about the Commander 950? I know that there is some limitation in it's programming that some people are butting their heads against...</b>

ever find out what that is? I was seriouselly considering commander 950 but would like to know what to expect! Ill probably be buying a stealthram and all new ECM commander 950 setup for it, then savin up for a procharger.

 

The commander 950 is a very nice piece, especially for the price. about the only drawback to it that I see is that you can not run a WBO2 w/it directly (but if you have a stand along unit you can plug it in). another drawback, is that I dont think that you can run Low impedence injectors w/o a driver (but I dont recall for certain if this is true.

doug Flynn is the modertator of the Chevy Talk EFI BB & he works for Holley in the EFI section. if you have ANY quesitons about the Holley stuff shoot him a note, he is THE man when it comes to Holley EFI stuff. I met him in KY while I was there on business & he ash done some pretty Nasty motors with the commander 950. he has a Musi BBC sitting outside of thier dyno shop that runs the 950 & that thing is a thumper. I guess he just got done playing with a 650 CI (or there abouts) motor that Musi built. BAD TO THE BONE. http://www.chevytalk.org/cgi-bin/ubb...=20&LastLogin=

BW

EDIT: Here is that post about the 632. http://www.chevytalk.org/forums/Foru...ML/000915.html

 

according to the blip.. will run 8 high Z or 4 low z injectors..same as my 749.

 

thats kind of a bummer becuase it only gets you 1/2 the way there.

BW

 

What are the benefits of a Wide band O2 sensor... is it mainly a more precise air/fuel control resulting in better gas mileage? or is there somthing deeper...

 

My favorite is the nice selection of pre-made fuel/spark maps offered on holleys web site I was looking at them the other day.

 

IMO, the single biggest advantage of the WBO2 is that it can make dialing your WOT runs Much simpler & should be Quicker (to get the tune up right, not faster car). Grumpy has been using his to dial out tip in problems & to do some interesting testing on VE's & making the motor do some pretty interesting things. one thing to remember is that once the motor is dialed in, the WBO2 looses its advantage, so having one that you can take from car to car has an advantage there. BUT, trying to use one that can not do data logging & comparing the results is REAL tough, if you are not on a dyno (driving & looking @ the meter, etc).

I agreed with B4Ctom1, & what they dont have Doug has likely tuned before & he can just dig into his bag of tricks & pull something out that is close & get you close right from the word go.

BW

 

it is the discs and rings they ship with a 12:1 but after dyno tuning a 4:1, 6:1, or 8:1 is what usually ends up in there ( they make them rich for safety I guess).

 

I am going to get the computer without the harness. It has the same plug on it that the GM one uses but some of the wires are not used (like emmis function and some of the pins in the harness may need to be moved around. does anyone know of a place that makes plug and play harness adapters for the commander 950 I have seen some for the accel and F.A.S.T. (felpro/speedpro), I am doing this to maintain the stock S/D wire harness.

 

If it uses the same connectors, just pop the pinns out and pop them back in in the correct locations.

How much cheaper is it without the harness? In my case, I'd have to add a MAP and get rid of the MAF, but that's minor.

 

I have been working to get the pinout and since there are other connections not used on our harnesses I will likely use the holley harness to build my adapter.this is where I will get my ECM connectors