fmu unit

mustang9450 · June 20th, 2011, 01:09 AM

I seen some supercharger kits come with a fmu unit. What exactly is that? I have a sct 4 bank chip and a 255 walbro pump, adjustable fuel pressure regulator, and 30lb injectors. do i need the fmu with the kit or what? Im kind of clueless on what this is and its purpose so any info is helpful.

jkeyz · June 20th, 2011, 01:18 AM

Its a fuel management unit.. does just that, helps deliver the correct fuel for a supercharged system. Its not needed if you get it tuned by a shop (recommended)

fogged306 · June 20th, 2011, 01:34 AM

It increases the fuel pressure so that your injector will spray more fuel than it would at the normal pressure. It's a band-aid for not having the correct sized injectors to support the power level. If it fails, you go lean and can destroy your engine. It also shortens the lifespan of the injectors.

jkeyz · June 20th, 2011, 01:37 AM

Basically get a tune lol

fogged306 · June 20th, 2011, 01:41 AM

Well, get the right sized injectors for the job. How much boost you plan on and for what engine combo will dictate the size injectors you'll need. Tune is always a good idea when changing injectors. It's better to put the injector parameters into the computer directly than to fool it with a calibrated MAF.

jkeyz · June 20th, 2011, 01:57 AM

+1 exactly what i meant lol.. and i think those 30 lbers will be too small if ur going to supercharge it

mustang9450 · June 20th, 2011, 02:16 AM

yeah i think the 30lbs will be too small and after i get the supercharger i decide on i will have it tuned because i already have the sct 4 bank chip in my car so they will just rutune it. so with that being said when i order the kit i should tell them to leave out the fmu and save a couple bucks right?

June 20th, 2011, 01:09 AM	#1
mustang9450 Regular Join Date: Jun 2011 Posts: 55 iTrader: 0 reviews	fmu unit I seen some supercharger kits come with a fmu unit. What exactly is that? I have a sct 4 bank chip and a 255 walbro pump, adjustable fuel pressure regulator, and 30lb injectors. do i need the fmu with the kit or what? Im kind of clueless on what this is and its purpose so any info is helpful.

June 20th, 2011, 01:18 AM	#2
jkeyz Regular 93 5.0 lx Join Date: Mar 2010 Posts: 342 iTrader: 0 reviews	Its a fuel management unit.. does just that, helps deliver the correct fuel for a supercharged system. Its not needed if you get it tuned by a shop (recommended) __________________ Heres an idea.. ban the ones that are most knowlegable and helpful in the 5.0 section...oh wait lmao

June 20th, 2011, 01:37 AM	#4
jkeyz Regular 93 5.0 lx Join Date: Mar 2010 Posts: 342 iTrader: 0 reviews	Basically get a tune lol __________________ Heres an idea.. ban the ones that are most knowlegable and helpful in the 5.0 section...oh wait lmao

June 20th, 2011, 01:57 AM	#6
jkeyz Regular 93 5.0 lx Join Date: Mar 2010 Posts: 342 iTrader: 0 reviews	+1 exactly what i meant lol.. and i think those 30 lbers will be too small if ur going to supercharge it __________________ Heres an idea.. ban the ones that are most knowlegable and helpful in the 5.0 section...oh wait lmao

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June 20th, 2011, 01:34 AM	#3
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	It increases the fuel pressure so that your injector will spray more fuel than it would at the normal pressure. It's a band-aid for not having the correct sized injectors to support the power level. If it fails, you go lean and can destroy your engine. It also shortens the lifespan of the injectors.

June 20th, 2011, 01:41 AM	#5
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	Well, get the right sized injectors for the job. How much boost you plan on and for what engine combo will dictate the size injectors you'll need. Tune is always a good idea when changing injectors. It's better to put the injector parameters into the computer directly than to fool it with a calibrated MAF.

June 20th, 2011, 02:16 AM	#7
mustang9450 Regular Join Date: Jun 2011 Posts: 55 iTrader: 0 reviews	yeah i think the 30lbs will be too small and after i get the supercharger i decide on i will have it tuned because i already have the sct 4 bank chip in my car so they will just rutune it. so with that being said when i order the kit i should tell them to leave out the fmu and save a couple bucks right?

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