FMU with 42lbs?

b-on-b 5.0 · January 13th, 2010, 08:16 PM

should i totally take out the fmu when i put my 42lbs injectors in or should i keep it hooked up just for extra fuel? I dont think it will work, because the disk in the fmu is only calibrated for 19lbs injectors. So should i just completely ditch the fmu? and just run the 42lbs injectors?...and if anyone needs some 24lbs i have a set for sale for $150 bucks for all eight they were installed in march of last year

Iwannagofast · January 13th, 2010, 09:26 PM

i really dont think that will work....you need to have a tune when you add the 42s...

flattusmaximus78 · January 13th, 2010, 10:31 PM

The 42lbers are there so you don't have to run an fmu and smaller injectors. As stated, you will need a tune.

nolife · January 13th, 2010, 10:38 PM

An FMU is not technically calibrated for specific injectors, it "multiplies" fuel pressure with boost based on the disc that is in it and with some the slope is adjustable. Either way... Like stated, if your getting new injectors, get the correct ones for your HP and ditch the FMU. Where ever your going to get tuned, get their opinion on using the stock ECU with 42 or larger injectors specific to what kind of idle quality they can achieve. That is about the point where a standalone should be considered and I'm sure every different tuner has a different opinion.

flattusmaximus78 · January 13th, 2010, 10:56 PM

Yeah, Idk if it was the 42's, my lmaf, or my tuner, but my idle was all over the place. I hated it. Wheres the best place to order tweecer rt?

86er · January 13th, 2010, 10:57 PM

Im curious to your set up thats calling for 42lb injectors not doubting, just curious

flattusmaximus78 · January 13th, 2010, 11:01 PM

he has a V3 strim. I think it put down close to 400 at the tire on 24lbers.

flyin ryan · January 14th, 2010, 01:25 AM

Originally Posted by flattusmaximus78

Yeah, Idk if it was the 42's, my lmaf, or my tuner, but my idle was all over the place. I hated it. Wheres the best place to order tweecer rt?

it was a combination of your 42lb injectors which give horrible idle quality coupled with your tuner not knowing how to properly resolve that which is soo common with 42's... My car ran like dog shit with them until my tuner took his time and dialed it in. Now with the tf1 cam and 42's it idles smoother then stock slightly.

oh and the obx abaco meter I have might have a big part in that as well

ryans88gt · January 14th, 2010, 01:31 PM

You can use an FMU with 42 lb injectors, and yes a FMU can be calibrated.

You want the 2:1 disc and ring in there.

But it is probably not required with the 42 lb injectors if you get a good tune.

McMustang5.0 · January 14th, 2010, 01:43 PM

Could yall enlighten me on what a FMU is? I know about carb's but I just recently learned about EFI! any more abreviations for some stuff on a EFI car?

BTW:B-on-B, toss that sh*t and convert to carb! Jk, my friend says you can run the FMU but you need to get it Flashed (<--???) and reprogramed for the 42#injectors.

Iwannagofast · January 14th, 2010, 02:04 PM

Originally Posted by McMustang5.0

my friend says you can run the FMU but you need to get it Flashed (<--???) and reprogramed for the 42#injectors.

i dont think your friend knows what he is talking about

Matt Cramer · January 14th, 2010, 02:06 PM

FMU: Fuel management unit. Similar to a rising rate fuel pressure regulator. It raises fuel pressure, but instead of adding one psi of fuel pressure for 1 psi of boost, it might add 10 psi of fuel pressure for every psi of boost. Generally, they're used to add fuel on turbocharged or supercharged cars when the injectors are too small to supply enough fuel at full throttle and standard fuel pressure.

flyin ryan · January 14th, 2010, 03:02 PM

Originally Posted by McMustang5.0

my friend says you can run the FMU but you need to get it Flashed (<--???) and reprogramed for the 42#injectors.

LOL /fail

nolife · January 14th, 2010, 03:41 PM

Originally Posted by flyin ryan

LOL /fail

Yeah, maybe there was a mix up on three letter acronyms there, he might of thought the discussion was about ECU or the computer, not the FMU?

There are only 17,576 three letter acronyms so its easy to mix them up

McMustang5.0 · January 14th, 2010, 03:49 PM

hahaha, i'm ging to give him shit, he was all acting smart the rest of the day too.

Tomorrow I'm going to give him a big fail poster!

LOL.

b-on-b 5.0 · January 15th, 2010, 04:19 PM

alright thanx guys and yea i am getting the injectors next week, with the right sample tube for the maf i have and guna get it tuned like the week after...the guy said he would burn a chip and custom tune it for 600 even

b-on-b 5.0 · January 15th, 2010, 04:20 PM

yea and my tuner said to ditch the fmu set up cuz i wont need it

flattusmaximus78 · January 15th, 2010, 07:42 PM

Damn! I paid 200 for a chip and 300 for a tune.

b-on-b 5.0 · January 15th, 2010, 09:12 PM

reli is that a good price? might try this other company for a quote

January 13th, 2010, 08:16 PM	#1
b-on-b 5.0 Regular 1993 Mustang 5.0 LX 11.45@122.34 Join Date: Jul 2008 Location: Lakewood, CO Posts: 344 iTrader: 0 reviews	FMU with 42lbs? should i totally take out the fmu when i put my 42lbs injectors in or should i keep it hooked up just for extra fuel? I dont think it will work, because the disk in the fmu is only calibrated for 19lbs injectors. So should i just completely ditch the fmu? and just run the 42lbs injectors?...and if anyone needs some 24lbs i have a set for sale for $150 bucks for all eight they were installed in march of last year

January 13th, 2010, 10:31 PM	#3
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	The 42lbers are there so you don't have to run an fmu and smaller injectors. As stated, you will need a tune. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

January 13th, 2010, 10:38 PM	#4
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	An FMU is not technically calibrated for specific injectors, it "multiplies" fuel pressure with boost based on the disc that is in it and with some the slope is adjustable. Either way... Like stated, if your getting new injectors, get the correct ones for your HP and ditch the FMU. Where ever your going to get tuned, get their opinion on using the stock ECU with 42 or larger injectors specific to what kind of idle quality they can achieve. That is about the point where a standalone should be considered and I'm sure every different tuner has a different opinion. __________________ Last edited by nolife; January 13th, 2010 at 10:43 PM.

January 13th, 2010, 10:56 PM	#5
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	Yeah, Idk if it was the 42's, my lmaf, or my tuner, but my idle was all over the place. I hated it. Wheres the best place to order tweecer rt? __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

January 13th, 2010, 10:57 PM	#6
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	Im curious to your set up thats calling for 42lb injectors not doubting, just curious __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

January 13th, 2010, 11:01 PM	#7
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	he has a V3 strim. I think it put down close to 400 at the tire on 24lbers. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

January 14th, 2010, 01:31 PM	#9
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	You can use an FMU with 42 lb injectors, and yes a FMU can be calibrated. You want the 2:1 disc and ring in there. But it is probably not required with the 42 lb injectors if you get a good tune. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

January 14th, 2010, 01:43 PM	#10
McMustang5.0 Banned Join Date: Oct 2009 Posts: 595 iTrader: 0 reviews	Could yall enlighten me on what a FMU is? I know about carb's but I just recently learned about EFI! any more abreviations for some stuff on a EFI car? BTW:B-on-B, toss that sh*t and convert to carb! Jk, my friend says you can run the FMU but you need to get it Flashed (<--???) and reprogramed for the 42#injectors.

January 14th, 2010, 02:06 PM	#12
Matt Cramer Authorized Vendor Join Date: Sep 2008 Location: Covington, GA Posts: 354 iTrader: 0 reviews	FMU: Fuel management unit. Similar to a rising rate fuel pressure regulator. It raises fuel pressure, but instead of adding one psi of fuel pressure for 1 psi of boost, it might add 10 psi of fuel pressure for every psi of boost. Generally, they're used to add fuel on turbocharged or supercharged cars when the injectors are too small to supply enough fuel at full throttle and standard fuel pressure. __________________ Matt at DIYAutoTune.com - Megasquirt ECUs, fuel pumps, injectors, widebands, and more Now offering Mustang specific Megasquirt packages!

January 14th, 2010, 03:49 PM	#15
McMustang5.0 Banned Join Date: Oct 2009 Posts: 595 iTrader: 0 reviews	hahaha, i'm ging to give him shit, he was all acting smart the rest of the day too. Tomorrow I'm going to give him a big fail poster! LOL.

January 15th, 2010, 04:19 PM	#16
b-on-b 5.0 Regular 1993 Mustang 5.0 LX 11.45@122.34 Join Date: Jul 2008 Location: Lakewood, CO Posts: 344 iTrader: 0 reviews	alright thanx guys and yea i am getting the injectors next week, with the right sample tube for the maf i have and guna get it tuned like the week after...the guy said he would burn a chip and custom tune it for 600 even

January 15th, 2010, 04:20 PM	#17
b-on-b 5.0 Regular 1993 Mustang 5.0 LX 11.45@122.34 Join Date: Jul 2008 Location: Lakewood, CO Posts: 344 iTrader: 0 reviews	yea and my tuner said to ditch the fmu set up cuz i wont need it

January 15th, 2010, 07:42 PM	#18
flattusmaximus78 I Post Entirely Way Too Much 1993 5.ohhhh 12.97 @140mph Join Date: Apr 2006 Location: Gatorland Posts: 6,122 iTrader: 3 reviews	Damn! I paid 200 for a chip and 300 for a tune. __________________ 02 Pewter z28, hoosiers/lid/exhaust/spray...125mph 1993 gt Sold, already missed --Moates Quarter horse $225-- --Cobra intake $150-- --tremec 3550 bell and shifter $1100--

January 15th, 2010, 09:12 PM	#19
b-on-b 5.0 Regular 1993 Mustang 5.0 LX 11.45@122.34 Join Date: Jul 2008 Location: Lakewood, CO Posts: 344 iTrader: 0 reviews	reli is that a good price? might try this other company for a quote

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