what ratio fmu should i use on a turbo ls running like 12-13 psi, with 450cc dsm injectors and an afc. i have a 12-1 right now, just like to know around what range i should get. it will be tuned and everything. and no, im not doing an afc hack, i would rather just run the fmu

 

 

Seems like a silly way to do it, but I'm pretty sure that a 6:1 would do the trick.

 

the car will idle/run terrible with an FMU and 450's. get an Uberchip for the same price as an FMU.

 

hoiw would that be a silly way to do it, i would run the 450's and fmu, and use the safc to tune it out, seems easier than an afc hack where u gotta mess with the ignition timing

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybridb18 &raquo;</TD></TR><TR><TD CLASS="quote">hoiw would that be a silly way to do it, i would run the 450's and fmu, and use the safc to tune it out, seems easier than an afc hack where u gotta mess with the ignition timing</TD></TR></TABLE>

yeah it would be fine with that setup and 12:1

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybridb18 &raquo;</TD></TR><TR><TD CLASS="quote">hoiw would that be a silly way to do it, i would run the 450's and fmu, and use the safc to tune it out, seems easier than an afc hack where u gotta mess with the ignition timing</TD></TR></TABLE>

isn't this the same thing as a hack??!!

 

no you use no FMU with the hack

 

the whole reason you get 450 injectors is so you can run without the fmu isnt it?? so they will supply enough fuel on their own then use an vafc or something to piggyback it??

 

so ur saying i still would need to run the 12-1 fmu with the 450cc? i was thinking like 6-1 or 8-1.. I think the 12-1 is overkill on 450cc

 

http://www.homemadeturbo.com/f...ard=6

anyone who doesnt know about the 450cc dsm's and the afc hack theres some good info here.

 

I think a 4:1 would be right. I use a 4:1 with my 370s and add fuel with my e-manage. A 6:1 should be right for 370s

 

What is it with people and these things... the whole reason for the hack is to elimate the high pressure raising rate regulator (FMU) and to tune it using some sort of fuel controler.

 

Did you read that he said he wasnt using the hack?

 

what turbo are u using ? i'm curious.

but yeah try 4 or 6:1 that should get u the fuel. get a high pressure pump if u don't have one.

don't hate, appreciate the RRR.




Modified by r4adkshn1 at 8:01 PM 4/23/2003

 

your right I should have read more... I just got to fmu and thought about it before finishing.

 

I say a 6:1

here's how I calculated it 12 * 240 = 2880, 2880 / 450 = 6.1

12 = recomended setting w/ stock injectors, and 240 is injector size, along with 450

another benefit is that the fuel pressures will only be half as high as the 12:1 setup

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by p0gi &raquo;</TD></TR><TR><TD CLASS="quote">Did you read that he said he wasnt using the hack?</TD></TR></TABLE>

If he wasn't using the hack then why is he using 450cc injectors?!?! Theres no need!!

 

Wouldnt you be better off using the hack and the 450's with no FMU?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swlabhot &raquo;</TD></TR><TR><TD CLASS="quote">

If he wasn't using the hack then why is he using 450cc injectors?!?! Theres no need!!</TD></TR></TABLE>

Why dont you read his post where he said " AND NO IM NOT USING THE HACK"
Doesnt anybody read the complete post anymore?

 

High fuel pressures = bad Mmmmmkay?

AFC hack = enough fuel, stock fuel pressures, everyone happy

But *if* you're so stuck on using the FMU with those 450's, try something higher than 6:1...reason being: you want to be SAFE than sorry! But then again, I don't know how safe you'll be with an FMU in the first place... LOL! It's a new oxymoron!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98CTRCoupe &raquo;</TD></TR><TR><TD CLASS="quote">High fuel pressures = bad Mmmmmkay?

AFC hack = enough fuel, stock fuel pressures, everyone happy

But *if* you're so stuck on using the FMU with those 450's, try something higher than 6:1...reason being: you want to be SAFE than sorry! But then again, I don't know how safe you'll be with an FMU in the first place... LOL! It's a new oxymoron! </TD></TR></TABLE>
FMUs are always safe...