Would the fmu do the job

[rick1997gst]

I recently purchased an evo III turbo, and I am now thinking of getting an fmu. I dont know too much about it, but it seems like the best way to go. It will automatically increase fuel as the boost increases. I looked around and it seems like most people tend to go for the AFC, but that is a little more than I want to spend. If I can keep it simpler and a bit cheaper I think I would rather go for the FMU.

Please anyone give me some feedback and tell me if the FMU would do the job.

I am planning of running about 16-18psi maybe boost a little more at the track. By the way I am for now only running a 190 fuel pump and stock injectors.

thank you

 

[drewvr4]

question have you owned hondas previously?

 

[aero_sallee]

Very bad idea. This isn't a N/a ecu, so it already has fuel tables set to add fuel with boost. Combine the stock fueling tables and the FMU both trying to do the same thing and it will tun to one big poorly running cluster$#@. Even with a n/a ecu an FMU is a marginal at best solution.

 

[bling5tatus]

That sounds like quite a bit of boost to run on stock injectors too.

 

[1qkfwd]

Fmu's have been known to overwork injectors with all the extra fuel pressure. I sure wouldn't run one.

 

[Thomas91169]

FMU's are not how we tune dsm's.

you can start off with a pocketlogger palm and a safcII combo, or go straight to a socketed 95eprom ecu and DSMLink if you have a laptop and want to do things right.

you will also definately need more injector, 550's at least. your sidemount will also not help the situation.

id do research before you start assuming you know what youre doing with these cars. with the right mods theyre beasts, with the wrong mods, they make the rest of the community look bad.

 

[staticbrainwash]

FMU's are not how we tune dsm's.

you can start off with a pocketlogger palm and a safcII combo, or go straight to a socketed 95eprom ecu and DSMLink if you have a laptop and want to do things right.

you will also definately need more injector, 550's at least. your sidemount will also not help the situation.

id do research before you start assuming you know what youre doing with these cars. with the right mods theyre beasts, with the wrong mods, they make the rest of the community look bad.

I totally agree and couldn't have said it better. I will add though, that research is KEY with these cars. I'm sick of seeing people throw stuff on without knowing what will happen. This isn't a honda, or some tree-fiddy.

 

[420a-t]

This isn't a honda, or some tree-fiddy.

That was pretty good.

I used to use a FMU on my 420a and they are pieces of crap to tune with. Not worth it at all. Look at the prices of the older S-AFC's online or in the classifides. If you do get an AFC, you will already be heading in the "right" direction if you ever want to step up the stock injectors. By the way, don't run 18+ pounds of boost with stock injectors. I have 650's and i hit around 65%-70% duty cycle while running 19 pounds.

 

[rick1997gst]

Thank you for your replies. I did feel like some of you were talking down to me, but I guess I deserve it. I am just now starting to build my first car so please give me a break. I will try not to make the dsm comunity look bad.

Anyways I really appreciate all of your advice. I think I will hold off for now and save some money and purchase the AFC. I will probably still install the evo III turbo and not mess around with the boost(looks like I will need the 650's too). This is going to take me much longer than what I had expected, overtime for me!!

I am going to try to sell my old turbo which is still in great condition if anyone wants a good deal on one let me know.

 

[420a-t]

If you think I was talking down on you, I was not trying to. I hate it when you say something online and it comes out a totally different way than was expected. I wish the best of luck to you.

On the other hand, get those fuel mods in and then worry about turning up the boost. Just take the extra time and do everything right, it truly is worth every dime (well, you know what I'm saying).

 

[dsm-onster]

In short, the fmu raises the base fuel pressure "somewhat" exponetially for every lb of boost. 450cc injectors cannot flow enough fuel to get much out of the evo3 16g even at 55+ psi base fuel pressure. And a 190lph pump won't take kindly to running such high fuel pressures. I don't believe it's designed to flow very well w/ that much base fuel pressure in mind.

You can geta used SAFC or MAFT for $100 or sometimes less nowadays. . . How much were you planning to spend for the FMU?

A side note, running a bigger turbo and saying that a NEW safc is too expensive really isn't a good view. Which is more important air or fuel? We don't go discussing air/fuel ratios for nothing. . . . You'll be happy you bought a more proper fuel control. Research is your friend in choosing between the better choices. And dont forget a logger.

 

[staticbrainwash]

I would honestly hold off on the turbo install until you get fuel control. It's just an un-necesary risk though a small one, still potentially bad.

I suggest afc neo, safc2, dsmlink, megasquirt. While the last two are your BEST options (add aem or your favorite engine mngmnt.) there will be more expensive than a piggyback tuner. BUT, piggybacks have their extensive limitations. Research it up and we're always here to lend a hand!

 

[aero_sallee]

I would honestly hold off on the turbo install until you get fuel control. It's just an un-necesary risk though a small one, still potentially bad.

With the possible boost creep issues surrounding the Evo3 that may not be a bad idea.

 

[rick1997gst]

Thank you again for your input guys this is really helpfull. I looked on ebay and found the SAFC for $150, I think thats a pretty good deal. Staticbrainwash said he recomends the neo SAFC and SAFC 2, but those are about $100 more. Would I be just fine with the SAFC.

Oh, and I have the 190lph fuel pump and I was pretty sure I would be fine. I read that those could hold up to 400hp.

And thank you for letting me know about the evo III boos creep.(my t25 never did that). I think I will hold off for now on the turbo, but I am so anxious man!!!! the last thing I want is to damage my engine.

 

[Thomas91169]

i would find a set of 550cc injectors as well. 190/550's/safc will be a good start for fuel control. now your last piece of the puzzle is a logger. you cant make changes on the safc without knowing where those changes need to be, and you wont know that until you have a logger to monitor your o2 voltage and timing to see where knock is occuring or you are leaning out.