SFMU and turbo xs dual stage boost controller

[GOTNOS]

I've read many of post and asked many members about different fuel set-ups. I look at the megasquirt which is probably best but to much for me to learn at the moment. The portfueler is nice but pricy for what is does, they say easy to set-up plug and play? I bet I would have some kind of problems with it. So the so called SFMU that I see alot of people say to get might be the easiest fuel set up for a beginer like me. I was thinking of SFMU, 40lbs injectors, with a dual stage manual boost controller. Ok fuel adjusted to run at 15psi and if you switch to high boost with this dual stage controller to run 20 psi, fuel settings would be wrong. correct? So would the turbo xs dual controller not work because of fuel?

 

[selmerguy]

i don't know for a fact but the sfmu is adjustable in many ways. you can adjust idle fuel pressure aswell as the ratio of fuel to boost. so if you go from 15 psi to 20 i would think that the sfmu would adjust fine.

have you looked into the 8 injector fuel system? i think that looks and would work good.

 

[DSM-ZERO]

It would all depond on the fmu and which ratio it would be at
ie

if you had it at a 6:1 ratio for 15 psi it would be 90psi of fuel
6:1 @ 20 psi of boost = 120psi of fuel way too much
you would need a 4:1 ratio
I think that is the lowest the fmu will go
4:1 @ 15psi= 60psi of fuel--------4:1 @ 20psi=80 psi of fuel BUT your going to need inj's
BUT at 4:1 if you want to lower your boost below 15psi you might run into problems

 

[GOTNOS]

It would all depond on the fmu and which ratio it would be at
ie

if you had it at a 6:1 ratio for 15 psi it would be 90psi of fuel
6:1 @ 20 psi of boost = 120psi of fuel way too much
you would need a 4:1 ratio
I think that is the lowest the fmu will go
4:1 @ 15psi= 60psi of fuel--------4:1 @ 20psi=80 psi of fuel BUT your going to need inj's
BUT at 4:1 if you want to lower your boost below 15psi you might run into problems

Thats what I thought when I figured it out from what you taught me about fuel. So a dual stage boost controller won't work. Ok, what if I was using a AFPR, I know this is what your using but some say it's not the way to go.

 

[DSM-ZERO]

ok
Starting off turbo kit and stock inj and block it might not be the way to go
because
You will have to have a high static pressure to make up for the 1:1 and the stock inj's
BUT as soon as you get rid of your stock inj you won't need to such a high static
ALSO
once you re-build and you wan't to turn up the Boost you won't run into the problem I menationed above
SO
1.You have done your re-build
2.you got bigger inj's
3.you want to play with different boost settings

All you need to do with the AFPR is adjust the screw on the top to either raise or lower the static pressure
Yes they both have there up's and downs but everyhing is like that

Anyone Name one person who run's 10's or faster or it dosen't matter just name someone who is fast and DOSE not use a 1:1 FPR

I have ran the AFPR for over two years on a stock motor and inj's with a high static pressure and never had a fuel problem

Now Iam in the prosess of building my motor and getting bigger inj's and Iam glad I went with the AFPR in the first place, people were telling me it wasn't good enough but I went my own way.

 

[DSM-ZERO]

Look at my fuel system
What other N/T has a system like mine
of course you got the port fuller and other n/t's who have standalone's
But
this is the way to go

 

[GOTNOS]

Look at my fuel system
What other N/T has a system like mine
of course you got the port fuller and other n/t's who have standalone's
But
this is the way to go

Ok, let say I will be running 415cc injectors, 255 walbro fuel pump, and AFPR regulator. Now how would you determine psi of static idle pressure with 415cc injectors and to boost at 15psi? Or would it be the same as you explained here?


"you go to the track boost 15psi set your static to about
70psi @ 1:1 @ 15psi of boost = 85psi of fuel ok
now you drive home @ 8psi @ 1:1 static at 80= 88psi of fuel'ok BUT a realy high static, you might run into idle problems because of too much fuel at idle."


Also would static pressure change it I used dual stage boost controller and boosted 20psi?

 

[DSM-ZERO]

Yes a high static sucks at idle some people have problems
but I never had any problems

there is no way realy to say what static you should be at but if I hadto guess I would put it at 65-70psi static