Fuel??

[TalonTsi31]

i just bought an evo III 16g turbo , SBR exhaust manifold and a tubular o2 housing. all are ported except the o2 housing obviously. so with a bigger set up such as this it makes a lot more air. therefore i am obviously going to need more fuel.
what do you guys think i should run. fuel pump? fpr? injectors? fuel rail?
i have heard the fuel rail on the 2g's is actually good that's not the problem. its the pump and injectors. should i run the walbro 255 or the 190? and does any one know any quality budget friendly injectors? or have experience with ones that were good? I'm thinking 550cc maybe 660 ? don't know i think 550 will be fine. but i also heard the evo 8 ones were a good upgrade?
god I'm lost! just need some one to help re-ensure what i already know. so if you guys could please respond with suggestions on what to run for a fuel system. what would be optimum and what i could get away with. this is a street-able track car. you know track on the weekends and street on the weekdays. thanks

 

[zippyshoe]

The first fuel system upgrade I would recommend is a higher-capacity fuel pump - a Walbro 190 would suffice, although I would consider upgrading to a Walbro 255HP, so that you won't have to upgrade twice if you ever upgrade your turbo again. If you choose a Walbro 255HP, then you will need to also install an AFPR - with the 190, you can probably "get away" with the stock FPR. What size injectors to choose depends partly on what type of fuel management you plan to use - if you plan on using a piggyback controller, I would recommend around 660cc injectors if you want to max-out this turbo. If you plan on a standalone system or DSMLink, then I would suggest even larger injectors - around 950cc or so. A standalone system should allow you to tune these larger injectors to run like the factory injectors, and you will probably never have to upgrade your injectors again. Hope this helps you in your decision.

BTW, you should be fine with the factory fuel rail.

 

[TalonTsi31]

do you think that if i ran lower levels of boost that i could get away with only buying the fuel pump now andmaybe a fpr. then wait for a coupe of months and buy a good set of 660cc injectors. and how does all this affect gas milage? any one with a fuel pump and upgraded injectors PLEASE POST! and let me know.

 

[TalonTsi31]

and should i be running a safc-II ? is it a must or optional? trying to make the car run right with out spending alot since im at the end of my budget for this build.

 

[dsm-onster]

do you think that if i ran lower levels of boost that i could get away with only buying the fuel pump now andmaybe a fpr. then wait for a coupe of months and buy a good set of 660cc injectors. and how does all this affect gas milage? any one with a fuel pump and upgraded injectors PLEASE POST! and let me know.

running lower levelboost will be fine w/ stock injectors. How low depends on the logger. make sure you'r enot over 90% idc at WOT, no yanked out timing, etc. The most 450s (stock injectors) can give you is around 250 whp. Keep this in mind.

 

[zippyshoe]

and should i be running a safc-II ? is it a must or optional? trying to make the car run right with out spending alot since im at the end of my budget for this build.

Once you upgrade your injectors, then some sort of fuel controller will be mandatory - the controller you choose is up to you, whether its a piggyback controller (such as safc-II), a full standalone system, DSMLink, etc. If you choose a piggyback controller, then you will also need a logger. If you were to choose DSMLink, then a separate logger is not necessary since DSMLink has logging capabilities built-in. This should be taken into account when comparing pricing options.

 

[CanadianTSi]

It all depends on your goals but a 190, 650's and a S-AFC will work quite well.

 

[TalonTsi31]

how does all this affect gas milage?

 

[CanadianTSi]

how does all this affect gas milage?

As long as the car is tuned properly it will still run the same 14.7:1 at cruise as it did before, obviously WOT consumption will be greater.

 

[zippyshoe]

If you choose to go with S-AFC, don't forget to also invest in a logger or else you won't be able to tune the S-AFC. Its seems to be a common misconception that higher-flow injectors will cause your gas mileage to suffer. Like CanadianTSi said, if you have a decent tune and your fuel trims are in line, then your car will maintain a 14.7:1 AFR during idling and cruising. Only at WOT or open-loop operation will you see a decrease in mileage, but these are the conditions where you need the extra fuel due to the increased airflow. You can reduce this decrease in mileage by tuning your car to use an 11:1 AFR at WOT rather than the factory-rich 9.5:1 AFR. Good luck with your decision.