Huge Sfmu

[Turbizmo]

I Finally got me a SFMU vortech one question the SFMU is super big compared to my FMU is right?

Also how do i hook up a gauge to the SFMU?

Im planing to run 450cc i have the wideban and I have all thats needed I already know how to install it i just need to know what my reading should come out on my wideban and if i would need a pressure gauge?

also im planing to run at least 18-20 pounds. so can u help me out here

 

[rstare]

The SFMU is larger than the FMU, yes. I have my fuel pressure gauge in between the line coming of the passenger's side of the fuel rail, and the SFMU. So, technically it's not connected to the SFMU.

For 450cc injectors, your fuel pressure at idle is going to have to be quite low. In the teens. In order to achieve this you're going to need -6an fuel line (3/8).

Yes, I would highly recommend getting a fuel pressure gauge. Although, that doesn't necessarily mean you need it. By altering the fuel pressure you are trying to change the AFR, with a wideband, you can obviously see what the end result is going to be. I would still recommend getting one, though.

Your wideband reading should be anywhere in the 14's-15's at idle, and cruise. When you start it up and it's cold, it's going to be richer, due to the denser air. Under boost, it should be in the 11's. You can adjust the rate of gain on the SFMU with the bleed valve, so that's what you're going to need to use to get the AFR right at 11.5 under boost.

I have a few words of advice for you as well. Don't part throttle boost. It's all or nothing with this setup, at least from my experience. Also, don't run 18psi, unless you have some sort of ignition control. 15psi (assuming you have the conventional Star turbo) is about where you need some sort of ignition control.

 

[Turbizmo]

so I cant run 18 psi? My top and bottom end build for beating. what kind of control module can i use to control my ignition? and also what do u mean by "Dont part throttle boost"

 

[JEFFREYCASTGSX]

According to your profile, you do not have the necessary mods to run over 10psi. You need more control over fuel and timing, and EVEN with the 450's you are gonna be stressing the injectors with high duty cycles.

EDIT: disregard this, i forgot you have a rising rate fpr, oh and i would still be scared on to run 18psi on "just" a SFMU(maybe time for megasquirt?).

 

[boosted97RS]

He means don't hit boost with the gas pedal only pressed half way down. With your setup it will more than likely bog down at part throttle under boost. You can either use the msd or crane ignition for your intended boost level of 18psi, but both are expensive. But like he stated, with 18 psi and stock ignition the spark won't be strong enough for that boost level. You may want to consider lowering the boost down to around 12-14psi.

 

[Turbizmo]

are u just talking about upgrading the COIL to msd or CRANE? sorry for the newb questions is just that im pumped ### i finally got all the parts to run 450cc and so that i can not run 18 or 15 its kinda depressing in that case i should of just stayed with the 310 and stayed at 10 psi =-(

 

[Locke]

Right on, Ryan. Cookies for you.

@boosted97RS: The factory ignition system is plenty strong for any boost he'll likely ever see. Ryan's concern is ignition timing, rather than power. 420a factory ignition tables + moderate levels of boost = a recipe for knock .

@Turbizmo: Leave the coil alone unless it is failing. Use a MSD DIS-2, Crane HI-6, or something of that sort, to pull some ignition timing in boost.

@JEFFREYCASTGSX: With his fuel setup, his injectors will be running the same duty cycles as if he were stock. The injectors will, though, be subjected to a bit more fuel pressure. The injectors can handle the added fuel pressure just fine.

 

[Turbizmo]

where can i find MSD DIS-2,Crane HI-6?

is this?

MSD DIS-2 Digital 2 Channel Ignition Control #6211:eBay Motors (item 330365796423 end time Oct-12-09 14:47:11 PDT)

crane cams fire ball hi-6 ignition :eBay Motors (item 220490505321 end time Oct-12-09 08:58:59 PDT)

also one question what kind if Fuel Pressure Gauge should i get ?

 

[Locke]

MSD #6212 would be best
MSD 6212 Programmable DIS-2 Ignition new in box:eBay Motors (item 200392203709 end time Oct-12-09 18:34:18 PDT)

 

[Turbizmo]

Ok will the other ones work? I dont have much money .

what kind of gauge should i get for the SFMU?

 

[boosted97RS]

JEGS Fuel Pressure Gauges - JEGS

One this size should be all you need.

 

[Turbizmo]

so will any of these work

http://cgi.ebay.com/ebaymotors/MSD-...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

http://cgi.ebay.com/ebaymotors/cran...c69QQitemZ220490505321QQptZRaceQ5fCarQ5fParts

 

[Turbizmo]

ok well i just installed the SFMU and the 450cc my question is how do I adjust it to get close to 20 psi at idle if I'm corrected that's where it supposed to be set at. Do I turn the screw to the right or left?

 

[boosted97RS]

It's been a while since I've had mine on my car, but if I remember correctly you want to loosen the screw on the top(turn to the left) in order to lower the static fuel pressure. The static fuel pressure is what the pressure will be when the fuel system is primed. I can't remember exactly what the static fuel pressure will be in order for the fuel pressure at idle to be 20psi( probably 30-34psi???). You will just have to play around with it and watch you fuel pressure gauge.

 

[boosted97RS]

Also, did you wire up a resistor pack with the 450cc injectors? Just want to make sure b/c if not the injectors will not work correctly b/c they are low impedence injectors whereas the stock injectors are high impedence.

 

[Turbizmo]

Also, did you wire up a resistor pack with the 450cc injectors? Just want to make sure b/c if not the injectors will not work correctly b/c they are low impedence injectors whereas the stock injectors are high impedence.

yeah I do have a resistor pack wired up with the harness of the injectors. Well right know I am still waiting on a fuel pressure gauge.

my friend told me i can put any gauge(gas gauge, water gauge etc.) he told me it will work is this true?

also my wide ban reads 10 when its cold but when it warms up im at 14.5-15.5 sometimes at 13s at idle. Then when I step on the gas It reads around 12-13 at 14 psi of boost. is it right or do i still have to loosen it or tighten it?

also one more thing is it normal that when Im coming to a stop my exhaust pops once in a while.WTF any suggestions?

 

[VelocitàPaola]

my friend told me i can put any gauge(gas gauge, water gauge etc.) he told me it will work is this true?

Gasoline is a solvent. I wouldn't use a water pressure gauge for fear of the gasoline damaging its internal diaphragm or seals.

Even out of the fuel pressure gauges, you can't just use anything. You need to make sure the gauge you choose is meant for electronic fuel injection (EFI) systems, as opposed to carbureted systems. Gauges meant for carbureted systems are designed tor read much lower pressures.

also one more thing is it normal that when Im coming to a stop my exhaust pops once in a while.WTF any suggestions?

It sounds like your AFR is lean during deceleration. You may have an exhaust leak...

 

[rstare]

I would say your AFR under full boost is slightly lean. You want that to be around 11.5:1. You change rate of gain by switching out the disk inside the SFMU, or by using the bleed valve.

I do enjoy cookies, Locke, thank you.

 

[Turbizmo]

Gasoline is a solvent. I wouldn't use a water pressure gauge for fear of the gasoline damaging its internal diaphragm or seals.

Even out of the fuel pressure gauges, you can't just use anything. You need to make sure the gauge you choose is meant for electronic fuel injection (EFI) systems, as opposed to carbureted systems. Gauges meant for carbureted systems are designed tor read much lower pressures.



It sounds like your AFR is lean during deceleration. You may have an exhaust leak...

I do have a exhaust leak like where the down pipe of the turbo is, but before the 450cc and SFMU it never popped know it sounds like if im shooting people when I let go of the gas.

Also I really don't get the point of the bleed valve? where can I get one. can I do one from Home Depot?

Oh also I have not even turned the SFMU and know the wide ban reads thats ita at 11-12 at idle or normal driving?

 

[Locke]

If you have a logger, or can borrow one, adjust the fuel pressure until fuel trims are near 0% when in vacuum. Make a note of fuel pressure for you own record, then leave it alone. Once you have done this the factory ECU can take care of everything else fuel related when you're not boosting, afterwhich you can begin tuning the SFMU for boost.

Don't bother with boost until you can get the injectors running properly in vacuum.

 

[Turbizmo]

ok well I tweaked with the SFMU and Know the wide ban reads 14.5-15. I will fix the leak and see if my exhaust stops popping.

and i ran into a little problem i lost the screw that goes to the Bleed of the SFMU so know I guess is time for me to figure out how to do a Bleed valve so can any one help me i searched in 2gnt but i only saw pictures I didnt say what size or where to get it so can someone help me out?

 

[rstare]

The bleed valve is actually an option when you order the SFMU from Vortech. So, I would assume you can buy them separately from Vortech.

 

[Turbizmo]

so i cant do a cusrom one?

 

[rstare]

Anythings possible, but I don't think it's ever been done before.

You must be logged in to view this image or video.

About all I can do to help is give you this picture. You could call Vortech and ask for the specs on it. *Shrug*

 

[Turbizmo]

ok well i finally got a fuel gauge and I fixed the bleed port of the SFMU so its closed. Also i opened up my SFMU and i saw that it has a black spring and the biggest disk. Is the large disk and dark spring the correct one you use to run 450cc ???


I also want to know what my readings should be when I disconnect the Vacuum on the SFMU. The pressure on the gauge is 20PSI. Then when i connect the vacuum its at 11. is this right or what should I do ???

I also fixed all my exhaust leaks and my exhaust still pops when I let go of the gas please help before i get pulled over?