I just installed some DSM injectors (440cc) on my 3g lude.

I was using a vortech FMU with an 8:1 recalibration disk, and an SAFC on stock injectors. A/f dyno at 10 lbs was 13:1

The question is...Do I still need to use the vortech FMU? It was my understanding It was needed to keep the stock injectors from running out of supply. But if I am running larger injectors will I still need it?

I will be going to the dyno tomorrow to get it tuned at 15lbs.

thanks,
wayne

 

Since you have the 440cc injectors your going to a afc hack then for boost.. So no, you dont need the fmu now..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">Since you have the 440cc injectors your going to a afc hack then for boost.. So no, you dont need the fmu now..</TD></TR></TABLE>

But i believe his stock injectors are 390cc.
Correct me if i'm wrong.
If thats the case then yes you will still need the fmu along with the safc.

 

I think the stock b20a5 injectors are in the 260 range.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16ahybrid &raquo;</TD></TR><TR><TD CLASS="quote">

But i believe his stock injectors are 390cc.
Correct me if i'm wrong.
If thats the case then yes you will still need the fmu along with the safc.</TD></TR></TABLE>

Well the afc just changes the map signal so even if hes using the 390cc injectors he can still do the afc hack without the fmu, He just cant run the full 10 psi of boost..

I would just get rid the that POS fmu and get dsm 450's and be done with it.. You already have the afc why not spend the extra $75 and get the injectors..

 

I would also leave the FMU in there if u wanna run 15 psi. I think the (8:1) with those 440's will be good for that, just use your safc if your runnning a little rich.

 

Oh you got the b-series.
what years are the 3g?
I'm thinking mid 90's??
Well you'd know better then I would.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95VXB16A &raquo;</TD></TR><TR><TD CLASS="quote">I would also leave the FMU in there if u wanna run 15 psi. I think the (8:1) with those 440's will be good for that, just use your safc if your runnning a little rich. </TD></TR></TABLE>

Sure.. If you want to run more boost you can just leave the fmu in there and use the afc to fine tune the air/fuel..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">Well the afc just changes the map signal so even if hes using the 390cc injectors he can still do the afc hack without the fmu, He just cant run the full 10 psi of boost..

I would just get rid the that POS fmu and get dsm 450's and be done with it.. You already have the afc why not spend the extra $75 and get the injectors..</TD></TR></TABLE>


He's got the dsm 440's already I believe.
And correct about the hack and less then 10psi.
I've never run the hack but I perfer to use a fmu in conjunction with the afc and larger injectors. I did fine with a 4:1, 310's, and sfc. fuel pressure never went over 90psi (still high but within reason)..whatever works

 

It just scares me to use something like the fmu when you can accuratly tune the car with the afc.. Plus its much safer..

 

yes I do have the 440cc DSM injectors. I just installed them about 30 min ago started fine, but rich as hell. I havent taken it out for a ride yet tho.

I will be running 15lbs of boost tomorrow when i go to the dyno and tune it.

I also have an apexi SAFC for fine tunning

 

So should I by pass the FMU?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">It just scares me to use something like the fmu when you can accuratly tune the car with the afc.. Plus its much safer..</TD></TR></TABLE>

Thats up for debate, which I'm not here for.

 

I just dont see how your going to run 15 psi on a stock map sensor.. Lets say you do use the fmu and the afc.. when the boost reaches 10.8 psi then how to do accuratly tune the air/fuel after that.. Your just guessing at the boost then.. Anyone want to enlighten me on this..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16ahybrid &raquo;</TD></TR><TR><TD CLASS="quote">

Thats up for debate, which I'm not here for. </TD></TR></TABLE>

It just as advanced as computers are today and modern fuel injection.. Why would anyone want to use something that controls fuel with boost mechanically.. Kinda like using a carburator or something..

But yes, thats a debate for a later time..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedlude3g &raquo;</TD></TR><TR><TD CLASS="quote">yes I do have the 440cc DSM injectors. I just installed them about 30 min ago started fine, but rich as hell. I havent taken it out for a ride yet tho.

I will be running 15lbs of boost tomorrow when i go to the dyno and tune it.

I also have an apexi SAFC for fine tunning</TD></TR></TABLE>

I think your going to have problems with leaning out if you don't run it.
15psi should max out those injectors unless you raise your static fuel pressure a bit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">I just dont see how your going to run 15 psi on a stock map sensor.. Lets say you do use the fmu and the afc.. when the boost reaches 10.8 psi then how to do accuratly tune the air/fuel after that.. Your just guessing at the boost then.. Anyone want to enlighten me on this..</TD></TR></TABLE>

Thats the next problem he will have. Unless he's running check valves so the map doesn't see boost he's not going to be able to run more then 11psi. he'll need a 3 bar map in order to go higher.

 

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

But yes, thats a debate for a later time..</TD></TR></TABLE>

yep, as we both know he's got other problems to work out before we debate tuning set-ups

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16ahybrid &raquo;</TD></TR><TR><TD CLASS="quote">

Thats the next problem he will have. Unless he's running check valves so the map doesn't see boost he's not going to be able to run more then 11psi. he'll need a 3 bar map in order to go higher.</TD></TR></TABLE>

Thats what i figured.. But if he does run check valves then he cant use the afc since it wont see boost either.. Errrr... Just get an AEM EMS and a 3 bar and be done with it..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16ahybrid &raquo;</TD></TR><TR><TD CLASS="quote">

yep, as we both know he's got other problems to work out before we debate tuning set-ups </TD></TR></TABLE>

Yup.. As soon as his problems are fixed then its ON

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">. Just get an AEM EMS and a 3 bar and be done with it..</TD></TR></TABLE>

nah get hondata it's better...J/k
Well he should be able to run 15psi with this set-up. not that I would recomend it but it's possible.
6:1 fmu (or 8:1 or 4:1 who knows only a wideband will)
440's
afc to lean them out at idle and to fine tune the fuel curve once in boost. The afc won't use signal from the map, al it's doing is altering the fuel as you set it (15% here 20% there etc)
check valves, so the map won't see boost at all. that will get him above 11psi.
and of course a high pressure/flow pump to handle the added fuel pressure

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">Yup.. As soon as his problems are fixed then its ON </TD></TR></TABLE>
LOL

 

I do have a check valve like a missing link and a 255 lph fuel pump. guys stop over thinking.

What i wanted to know was answered by b16ahybrid. thank you

hondata wont work on OBD 0. So I have to work with what i have available to me. I cant just go to summit racing and order what I want.

I am hoping to get autronic as soon as i cash in my stock options in october. then I will be running 20lbs.