right i was wondering if someone can set me straight on this i am about to tackle fuel managment on my turbo CRX. can someone tell me the deal with bigger injectors, fuel pumps, pressure regulators? (*caveman language* and that other thing with the discs 8:1, 12:1 etc or is that a regulator?). can someone tell me what order you fit these parts in? or if in fact they are all needed? is it all dependant on PSI? can u fit bigger injectors without better fuel pump? if u have a better fuel pump do you definitely need a pressure regulator? how far can u push the stock injectors? i just need a few do's and dont's on this if anyone knows. i dont wanna over fuel and am only wanting a reliable 4-6 psi if possible. Sorry for all the questions, i can see myself blitzing ebay and buying the lot.... this ---- never ends

 

mmm,
i believe you want a vortech 12:1 fmu, and an upgraded fuel pump.

you dont want injectors unless your running something like hondata, or afc hack

 

There's different paths that you can take. My buddy with an LS teg went with bigger injectors (dsm 450's) and a sfc. You don't have to change your pump because the stock one can handle this pressure that the dsm's need. The only thing is that you'll need to control the amount of fuel that the 450's dispense at idle, and this is where the sfc comes in, you can tone down the amount of fuel that is coming out of the injectors and when you're in boost, the injectors will then kick in. You'll need something to control the amount of fuel at idle cuz that's too much for our hondas and you'll run really rich and foul your oxygen sensor and just use a lot of fuel...well, either way, with boost you're going to use a lot of fuel!! haha

As for the fmu, it is basically boost dependent. For every one pound of boost that it sees, it will raise the fuel pressure anywhere from 1-12 psi more. More boost pressure, the more fuel pressure, only thing is that the this puts a strain on the stock fuel pump because most of the honda fuel pumps are regulated at around 75-80 psi and when you're running something like a 12:1 fmu, that's a lot more than the stock pump can handle, and this is why they need a booster pump or an inline pump.

Another way that you can go with is a bit bigger injectors and a lower rise rate of fmu, so something like 380's or lower and then just add something like a 4:1 - 8:1 fmu. I've heard of some people doing this but I'm not too sure how it turns out.

 

thanks mate thats made things a bit clearer. Im prob gonna go with uprated injectors, fuel pump and Fuel regulator (just one of the $50 ones from ebay). I can eventually see myself getting some sort of afc hack