I'm currently doing a simple TO4 setup on my TII and I was wondering what fuel mods I'm going to need. I currently have a walbro fuel pump (255 lph) and a SAFC-II. I was going to buy a couple of 780cc injectors for the secondaries. Should I go with larger secondaries (like 1000cc) and use the 780cc injectors as the primaries?? Maybe 780s for both secondaries and primaries. I'm just unsure of what size injectors will be needed at the moment. I'm only going to run like 10-12psi of boost and I'm shooting for something like 280-300whp right now. It may be capable of more, I'm unsure. I'm going to go with a larger turbo later (like a GT42) and I can always upgrade the injectors later. Any help would be appreciated. Thanks.

the 780's might not be quiet enough to do that.

Well, I can get my hands on some 1600cc's for the secondaries. I thought that would be too much though. If I going to need that much, I have 2 extra injector flanges in my intercooler piping that are not currently being used. I could do something like 1600cc secondaries, 850cc primaries, and maybe stock 550cc's mounted in the intercooler piping, but I dont want to really fork up all the dough for an additional injector controller right now. The injectors are already going to kill me. But I'm lost as to what I need. Help!

1000cc secondaries should be fine. you may be able to do it on 780's though, but its gonna be tight

I'll try and track some 1000cc's down. Do you think I need to get larger primaries? Thanks for your help.

you could do 680x4 but its gonna want to flood a lot

I found some Precision 880cc injectors and I think I'm going to use those as the secondaries for now. Later I should be able to use those as the primaries when I get some more power. I'm just scared of leaning out. I've seen what happens when you run lean and are boosting. https://www.nopistons.com/forums/pub...1047683358.gif Thanks very much for your help!!!

well i dont think safc 2 can handle 1600 as primarys or can it ???

I dont know, but I dont think I want to try. If I need that much fuel than I'm going to fork up the money for an EMS.

If your going to use 780's why not 1000's? The price is about the same (few bucks diff) and your AFC can still get them down enough. Better to have extra fuel on hand then to drop another $200 to go up.

I have a haltech f9 with an HKS elbow and two 720cc injectors for sale.



Should give enough fuel for 350hp at least, much easier to tune than your s-afc and pretty much is gonna do the same thing.

what's the haltech f9 do? My eventual goal is just about 350 hp. I planned on getting a standalone like the aem ems etc, but I haven't really put much thought into it yet as im still trying to get my **** organized. (place that's doing my porting, getting the new seal kit together, what type of turbo/exhaust I want) etc. I'm starting with fuel first since someone was kind enough to post up what type of front mount I should look into.



But what's the diff with going from the full ems to something like the f9? More tunability? Freedom to do whatever? Still don't know much about them, bump for the need of more info.



T.c.

Oops, its an f5.



This bolts right up to a 13BT motor (Turbo II motor). It is a very easy to install and tune system. The previous owner put down 372 rwhp at 15 psi with this set up. This set up will provide sufficient amount of gas capable of 450 whp.



The Haltech F5 is a supplementary fuel injector computer designed to control the fuel delivery of an additional injector or injectors fitted to an engine’s fuel system as part of an after-market turbocharger or supercharger installation.



Without additional fuel delivery it is likely that the engine would ‘lean-out’ under higher boost pressures as a normally aspirated car’s fuel system is not designed to deliver additional fuel required once the engine is boosted.



The F5 System is totally independent of the standard fuel system. This makes it universal to most turbocharging or supercharging installations.



The F5 senses two engine parameters and actuates the supplementary injectors accordingly.



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http://www.tweakit.net/shop/product_info.p...d64a49f37ccea81

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PM me if you're interested.



I've got an HKS elbow and greddy