SAFC removes fuel cut

TomS

TomS

Lifer
I think i might go this route myself as safc's can be found cheaply enough

Just to clarify, with the safc I wont need a rrfpr or a fcd to safely run 1 bar on a ct9?
 
Sheldon

Sheldon

Malta Area Rep.
TomS said:
I think i might go this route myself as safc's can be found cheaply enough

Just to clarify, with the safc I wont need a rrfpr or a fcd to safely run 1 bar on a ct9?
Click to expand...

try it out mate... im sure your going to set the safc using a wideband ? so just try if you can fuel fine without fpr and fcd :)
 
Glanza_cl

Glanza_cl

Member +
you will need it setting up on a RR with people that really no there stuff about the SAFC, not sure how safe it can be but i guess if others have managed it, it's perfectly doable
 
TomS

TomS

Lifer
Sheldon said:
try it out mate... im sure your going to set the safc using a wideband ? so just try if you can fuel fine without fpr and fcd :)
Click to expand...

I'll get someone who knows what they are doing to set the safc up for me. I'll probably have to drive to Chris in county Down to get it done. So I wont have any results for a couple of months at least
 
ChrisGT

ChrisGT

Member +
Sheldon said:
yeah they use them on many cars esp hondas over here. dunno why not on a starlet =/

you used yours? or you had one that you never got round fitting it? if you used it was it easy to setup?
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Never got round to fitting it. Bought a JAM FCC and the SAFC and was going to use both, but decided to sell the SAFC to fund getting it setup as I didn't think a SAFC was needed. That was over a year ago now! lol Never got round to wiring it in and seeing how to set trim points etc.

TomS said:
I think i might go this route myself as safc's can be found cheaply enough

Just to clarify, with the safc I wont need a rrfpr or a fcd to safely run 1 bar on a ct9?
Click to expand...

Possibly! The only way to find out is to try. lol. It might be the case that at 1Bar boost the stock fuel pressure is still a bit low, so a RRFPR might be needed to increase it a tiny bit. You'd definitely have to get it road/dyno setup by a tuner with a wideband.

Glanza_cl said:
you will need it setting up on a RR with people that really no there stuff about the SAFC, not sure how safe it can be but i guess if others have managed it, it's perfectly doable
Click to expand...

A lot of places specialise in SAFC setups and just list one price for setting it up for you. H-Dev will road map it for £149.99, places like this: http://eurospec2000.co.uk/TuningPrices.aspx will dyno tune it for £200.

EDIT: Yeah get mi16Chris to set it up without a FPR/FCD and see how it goes! If it works I shall definitely be following suit! lol
 
Seanmcn

Seanmcn

Member +
I plan on setting up my car with the SAFC at a bar on a hybrid ct9.
I have a RRFPR already in and a FCD but its not wired in.

I wonder will I need the FCD for fueling a hybrid at a bar??
 
ChrisGT

ChrisGT

Member +
Well if its true that the SAFC can move the fuel cut point, then no you won't need the FCD. But I'd keep the FPR as you might need more fuel to fuel a hybrid, not sure.
 
Chris@CCM

Chris@CCM

Member +
ppl dont run rrfprs to make it safe thats not rite at all if ur safc brakes no map reading gets to the ecu so no matter what f/p u run its going to run way too lean.
 
munday

munday

Member +
Glanza_cl said:
Don't no if its a point worth mentioning but the map sensor out of the 3sgte engine works on a 4efte and would increase the fuel cut level to that of a 3sgte which is 1.2 bar so in theory if you ran a SAFC or just a RRFPR with the 3sgte map sensor you could run upto 1.2bar as long as the fueling was ok.

just though i would throw that into the thread as that could be another way round running without a FCD.
Click to expand...

The map sensor only give a voltage reading according to the amount of boost, it doesnt deal with at what voltage the fuel cut kicks in, thats the job of the ECU. So using a 3sgte map sensor would not affect fuel cut unless it gave out less voltage for a given amount of boost than a 4efte map sensor...then its just leaning out fuelling exactly how a FCD does
 
eptercel82

eptercel82

Member +
i guess im gonna try this myth to see how high you can go cuz im in the 25psi range so ill post up as soon as i get some conclusion!:beer:
 
H

hardcoreep

Member +
Its not a myth. I've done it because it originally came from a car in Japan. My friend had an EP82 with the rotary SAFC. He noticed that his car didn't seem to have a fuel cut. When we checked it out he had very big injectors, 440cc according to the part numbers. Then it all started to make sense once you knew how the SAFC worked. You will hit fuel cut at the voltage representation for it at the MAP sensor. The FC is still there, and always will be there with the SAFC, but the level at which you hit it will depend on the one factor of voltage.

That factor varies based on the size injectors you have. The bigger the injectors the lower the voltage the MAP sensor has to see to make them work properly because lower voltage means less fuel. This by extension means the AFR you're running will determine where the fuel cut is. The only way to know is that you have to watch the MAP sensor voltage to figure out where it is.

You can trigger the FC from 1000rpm if you increase the SAFC percentage high enough.

I've seen this method of FC 'removal' done on several local cars including my own. The problem with this method is that you a)first have to find out where the FC has been moved to which means turning up the boost until you active it or see the FC voltage b)its limited to the fueling and injectors size in the vehicle. Boost is boost, but injector duty cycle to match incoming air is dependent upon CFM, therefore 10psi on a CT9 might not trigger the FC, but 10psi on a T3 would c)since fueling is not linear the FC might get triggered by engine load and not engine speed making spikes and creep a potential danger depending on how close you are to the FC voltage.

So you understand there are two types of FCD. http://hardcore.ep91.com/engine_fcd.html Resistor and clamp type. Resistors just move the voltage just like the SAFC. Its still there. Clamp types remove it completely because the ECU will never see a voltage higher than the clamp setting. With a resistor type FCD there is a voltage error across the whole fuel table that must be compensated for. On the clamp type the ECU will fuel on the last voltage received.
 
Last edited:
J

jhune

Fresh Recruit
this is interesting.. will give this a try after my FMIC project.. thanks for the info guys! will keep you guys updated as well..;)
 
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