jamie s1

1) what sort of boost can the standard fuel system handle without leaning out

2) and if the boost is wound up using the actuator does the management notice the increased boost / air flow and adjust the fueling to suit ?

cheers

Anonymous

all down to your intercooler,turbo spec chip and actuator mate.fueling runs out at around 18psi if you have got a bigger intercooler std is to small then you need a -31 actuator above 15psi and enything above standard needs a chip to be safe. A hybrid turbo is allways a good move when winding up the boost and ALLWAYS get someone who knows what there doing to set your car up on the rollers to adjust the fuelling and boost or itll go POP And ring around a few tuners and ask what they think

jamie s1

so what do you do above 18 psi then you'll obviously need a stronger fuel pump and bigger injectors and wider fule lines then ?

Anonymous

Can't really do much with the injectors on RST unless you ditch the engine management for an EFi or Cossie etc
Best bet on standard chipped management would be a 5th injector i would guess but maybe some of the brighter guys here will have other options for ya mate

Jeff

JesseT

No, no and no... Nothing wrong with the standard pump, lines or injectors. It's all about the fuel distributor and the air-flow meter bottoming out. You should also realize that the engine is running two separate managements. There is the ESC-II unit (silver ecu) which controls spark and boost. Then there is the Bosch KE-jetronic module (black box) which controls the enrichments. The ESC-II module has a inbuilt boost pressure sensor and it is used to adjust spark advance. However the KE-jetronic module is anaware of the amount of boost and hence can not tune the fuelling accordingly.

Anonymous

So can you adjust the fuel ecu?

Anonymous

unless your going for a mega high spec engine mate you will never exceed the standard set up ie standad head gasket and con rods can handle no more then 21psi every car and engine seems to be a little bit differnt from what psi you hear people can run find out from the experts that tune cars all the time to see what yours can handle

JesseT

The fuel ecu doesn't have any potentiometers or a chip, if that's what you mean. Just a few op-amps and tons of resistors, capacitors and transistors.
Jamie, I take it from your nic that you have a S1? The air-flow disc of a S1 metering head does travel much further then the disc of the S2. I would therefore presume that it also fuels further than the S2. If somebody has ever investigated this, I would be very interested to know if it's the case.

Anonymous

I know there are a few tuners out there who r able to tune the bosch-module to suit the amount of boost being developed..
how do they do this? Do they replace capacitors/transistors to enrich the mixture when on boost ? I know it has to do with the amount of current, the more current being send to the pressure-actuator the more fuel-enrichment. Perhaps they change some resistor to gain more current?
Could someone shine a light on this one?

Anonymous

Sounds intresting, someone must know more??????

JesseT

Keep in mind that the fuel-ecu is unaware of the boost level, it only senses air-flow. Also, the current only tunes the amount of fuel via the control pressure. So, what the air-flow disc hits hte bottom, then engine start to run lean. Well, the old KE-jetronic could be tweked forever to get it better and better for big hp, but the real problem is to get it to fuel well in all conditions and not to completely destroy the fuel economy.
However, if someone want's to hack the fuel-ecu, I think it's better done outside the ecu itself. One could do a box which has a resistor equal to the ~30 Ohm of the EMPA. Then sense the voltage across it, modify with RPM or BOOST or even with a 2D map, and then reproduce the voltage across the real EMPA. Just something I had in mind before I ditched the KE completely in favour of the Megasquirt management.

Anonymous

interesting stuff
but what exactly is the EMPA ?

I should learn more about capacitors and transistors and such stuff, and then to sense the different out- and inputs pins of the module with my multimeter to get to know how it works and maybe I can come up with a plan
cheers

JesseT

"Electro-magnetic pressure actuator" is such a long thing to write...

stevo

get a 5th injector if ur worried about pinking.

RS-adam

with a 5th injector u also need Mf2... right??

let med get it right.. no more than 1.3 bar on a STD engine.. and a 5th injector.. and a pro setup.. then there should bed no probs?? of cause chip e.t.c

Anonymous

Would converting to EFI sort all the probs with under fueling as its more ajustable is it?

stevo

adam u dont need efi for 5th injector. u can run 1.3 bar fine
rossco efi is more mapable and you can change injectors i.e greens etc so u dont need a 5th injector

Anonymous

Right to run EFi you would need????

Inlet manifold
ECU
Crank postion sensor????
Injectors
Head????
Any thing else????

And can you get all these parts (apart from the injectors) from a EFI Xr3i or would they need to come from a FRST???

stevo

i understandard the efi inlets are all the same.
u dont need a fiesta head u can use an escort but u need a gasket bracket adaptor to compensate for the different bore size
u will need a fuel pipe to run from the tank to ur regulator, u can just cut and move ur current escort one

Smit

iTrader: (5)

the 2 inlets are slightly different Ross, stevie has a FRST one in stock..reckon if money talks its yours

Anonymous

Iam getting well tempted to go for EFI and Autonic managment, just got to find out how much its gonna cost???

jamie s1

anyone know where you can get this efi conversion carried out professionally?