4afte build, old school

[G|F.E.A.D|Killa]

Alright so i have been trying to build a 4AFTE on paper for some time now and have come up with a cheaper option to standalone systems. what im looking at is as followed:

a 10:1 FMU
bigger injectors (looking at the best option right now) maybe 270ish CC
T3 turbo
A FPR that can handle the extra fuel
255lph pump
a way to keep the map sensor at - pressure maybe some check valves.
im gonna start at 4 or 5 PSI and move up from there and see what i can do, also as im building a built high comp 7age for it later on so im not looking to spend alot of money. now i know that style of FMU is old and out dated but i dont care. i just want something that works. what do you all think, can anyone think of anything im missing.

[Evo_lucian]

Originally Posted by G|F.E.A.D|Killa

Alright so i have been trying to build a 4AFTE on paper for some time now and have come up with a cheaper option to standalone systems. what im looking at is as followed:

a 10:1 FMU
bigger injectors (looking at the best option right now) maybe 270ish CC
T3 turbo
A FPR that can handle the extra fuel
255lph pump
a way to keep the map sensor at - pressure maybe some check valves.
im gonna start at 4 or 5 PSI and move up from there and see what i can do, also as im building a built high comp 7age for it later on so im not looking to spend alot of money. now i know that style of FMU is old and out dated but i dont care. i just want something that works. what do you all think, can anyone think of anything im missing.

Dont mean to sound like a broken record but engine management is one of the places you dont wanna cheap out on. That being said, an fmu can work for a low boost application . Jmaz has been using one on his 4afte for years. We used one on a 4afze we built sometime ago. You dont need bigger injectors , stock ones will do for a fmu.

Another cheap option is to get a 2 bar map sensor (3sgte,4agze) and get injectors approx 2x the size of your stock ones (370cc approx)and that will handle low boost just fine.

[G|F.E.A.D|Killa]

thank you evo, that helps clear things up. so bascially i can do without the FMU and run a 3sgte map sensor and 2x the injectors, i know that with boost application you still only read the 0 to 5V being 0v maximuim vacuum 2.5 being 0 psi and 5v being boost right. so naturally to keep the stock ECU i need to have injectors 2 times the stock size cause it will be getting a 2.5v reading from the map correct.

[Flashmn]

I'm not even gonna go into this...

Hacking up will work just as fine as my 4A-FTE did, nothing but troubles. Sure it was fun when it worked but it kinda sucked when you'd drive it for two months and then have a random problem arise. Your ECU also controls your ignition, so your ignition map can be wrong and then its detonation heaven. I think this is what happened to me.

[Evo_lucian]

Originally Posted by G|F.E.A.D|Killa

thank you evo, that helps clear things up. so bascially i can do without the FMU and run a 3sgte map sensor and 2x the injectors, i know that with boost application you still only read the 0 to 5V being 0v maximuim vacuum 2.5 being 0 psi and 5v being boost right. so naturally to keep the stock ECU i need to have injectors 2 times the stock size cause it will be getting a 2.5v reading from the map correct.

Yeah that's basically how it works.

You right flashmn , but it has worked fine for many over the years with ignition retarded at the dizzy a lil.

[G|F.E.A.D|Killa]

alright im done with all the trying to get around without using a standalone kit, so i started looking and found a few megasquirt systems. im looking at the prebuilt unit, its a piggyback correct. also its a MS1 so its kinda old and outdated but way better then a FMU

[Flashmn]

Megasquirt is a standalone system NOT a piggyback.

[Evo_lucian]

Originally Posted by G|F.E.A.D|Killa

alright im done with all the trying to get around without using a standalone kit, so i started looking and found a few megasquirt systems. im looking at the prebuilt unit, its a piggyback correct. also its a MS1 so its kinda old and outdated but way better then a FMU

standalone. if you consider megasquirt old and outdated then the same can be said about 4a's. get a megasquirt 1 v3 it can do all you will ever need, but by all means if you can afford it get a ms2 or 3. I got a ms1 v 2.2, not hooked up yet though.

good call on choosing to get a megasquirt. You will have a safer set up in he end and make alot more pwr than you would with a fmu