550cc's = Thirsty Starbo?

[HutchGlanzaV]

I've been told by many people on this site, including tuners, that for a td04 running 1.7bar 550cc injectors are the way to go.

 

[GP82]

Depend's on what the duty cycle of the injectors is coded for, Usually bigger injectors can be a pain to tune for part throttle/traffic driving on piggyback management as you can only go so far with adjust/trimming them. Full standalone management is different story, much more in depth/accurate tuning can be achieved.

 

[Impreza_dan]

Depend's on what the duty cycle of the injectors is coded for, Usually bigger injectors can be a pain to tune for part throttle/traffic driving on piggyback management as you can only go so far with adjust/trimming them. Full standalone management is different story, much more in depth/accurate tuning can be achieved.

Correct, ive only really ever used Apexis Power Fc, or the likes of Simtek, Motec and so on. Where the tuning potential is far superior of the emanage, and other piggybacks

 

[TurboDave]

550cc's are overkill imo unless you want over 400bhp?

 

[Chris@CCM]

im sure 460s would be fine pal but 550 wil do no harm

 

[Aidan-G]

im using sard 550's with an emu,its grand BUT if i dont get the car started first time its floods,lol...i have to quickly turn the ignition off again to stop the pump

only happens an odd time when i dont keep the key turned long enough on start up

 

[dan88]

if you upgrade the injectors to say 550's and install an RRFPR/higher flow fuel pump, but have the regulator set to the standard rate, will this still pump more fuel or is the fuel rate determined by the regulator?

Reason I'm asking is that I'm thinking of either getting the injectors cleaned on my current setup (stock 4E-FTE) or getting new injectors but don't want the fuel rate to increase until I've done other supporting mods to the car...

 

[Impreza_dan]

im using sard 550's with an emu,its grand BUT if i dont get the car started first time its floods,lol...i have to quickly turn the ignition off again to stop the pump

only happens an odd time when i dont keep the key turned long enough on start up

Yea this is because on the emanage im not sure you can change fuelling for idle, hence the reason ur flooding it.

550s are overkill theyre just too big really

 

[corofin12345]

thank mate.. just got put in the deep end with this car..

 

[Texx]

im using sard 550's with an emu,its grand BUT if i dont get the car started first time its floods,lol...i have to quickly turn the ignition off again to stop the pump

only happens an odd time when i dont keep the key turned long enough on start up

IIRC the stock ECU will increase the fuel injection volume when it receives the cranking (STA) voltage from the start position of the ignition switch, which won't help too much when you've got larger than stock injectors fitted. You could cut the STA signal, but it would probably flag up code 43 which would be rather annoying.

 

[GP82]

IIRC the stock ECU will increase the fuel injection volume when it receives the cranking (STA) voltage from the start position of the ignition switch, which won't help too much when you've got larger than stock injectors fitted. You could cut the STA signal, but it would probably flag up code 43 which would be rather annoying.

Fuel enrichment and thats the only time the stock ecu lets the duty cycle of the injectors reach 90+% so won't help at all, which all need's to be considered when tuning a beefy fuel system. All made to work perfectly with the factory fuel system, but throw stuff at it that it don't like and it gets confused. Thats where a full customisable standalone comes into it's own.

 

[MeisterR]

Larger injectors do not atomise the fuel as well as smaller injectors, but then 550cc isn't really that big so it'll be fine.
It is probably a good thing as it mean you will have a little more "head room" in the future if you ever decide to upgrade, and you don't run a high duty cycle to get your fuel now.
The long as the map is good, and how well your right food behave, you shouldn't eat that much more fuel...

you need to make sure the tuner is good at his job though, there is lots and lots of monkey tuners out there, majority of tuners for some reason dont tune for cruising, and just do the full throttle load, and some times even do that badly.

^^^
120% agree, the amount of time i see people do a full map on the dyno in 1 hour tells me that the map will be crap... as they will only do a full throttle map and say "Yep, it makes good power, fuel looks pretty safe, result!"

A proper full map on something like a PowerFC I would expect at least 4 hours work by the time you do all the cold start, part throttle, full throttle, acceleration compensation, etc.

 

[BallıGee]

Larger injectors do not atomise the fuel as well as smaller injectors, but then 550cc isn't really that big so it'll be fine.
It is probably a good thing as it mean you will have a little more "head room" in the future if you ever decide to upgrade, and you don't run a high duty cycle to get your fuel now.
The long as the map is good, and how well your right food behave, you shouldn't eat that much more fuel...



^^^
120% agree, the amount of time i see people do a full map on the dyno in 1 hour tells me that the map will be crap... as they will only do a full throttle map and say "Yep, it makes good power, fuel looks pretty safe, result!"

A proper full map on something like a PowerFC I would expect at least 4 hours work by the time you do all the cold start, part throttle, full throttle, acceleration compensation, etc.

the cold start part of tunning will most of the time end up being the next morrning as you arrive with a hot car

but im liking your comments well done rep for u

 

[sx_turbo]

yeah a power fc is at the very least about 3 hours to map properly.


standalone ecus with no base map generally take at least 8 hours.