The sensor wires that run into the ecu are spliced, then a APEXI SAFC piggy back technically lie's to the ecu giving a different HZ ratio responce. Either telling the engine to dump more fuel or give more air. You program what is called throttle correction by bypassing the MAF sensor signal. You don't have to be completely modded for an SAFC, it is reprogramable, a JWT ECU isn't.
SAFC on ebay for $265.00 shipped, but it needs to be dyno tuned.
JWT ecu $500, and not recomended unless you have completely moded your engine.
SAFC stands for Super Air to Fuel Controller.

 

the venom 400 module i have on the car, is a air and fuel curve, is that about the same thing? and what is included when you say completely moded the whole engine?what else would i have to do?

 

Venom isn't a wise choice in my opinion it only allows a limited range of fuel to air when you stomp on the pedal and go above 3000RPM.

 

so if i got the apexi safc i need to take the venom off, right? im looking on e bay for them, they are $109 to $265. there is a used one for $109

 

Buy them new I don't trust used electronics. Sell the venom on Ebay. Someone will buy it that is into mild performance....

 

what other mods do i need to get the jwt ecu? and how hard is it to put the apexi safc in? and where can i get the ca18de titanium retainers? i heard they fit right on, right?

 

All the info you need is in the thread that Wikd240 left on page 1

 

alright, ill add all that to my list of things to get, thanks a lot. do you have the apexi safc on your 240sx or know someone who does? what kind of horse power are we talking about with that and the ke24e forged pistons fuel pump and injector upgrade?

 

20-25CHP is usually seen with the APEXI SAFC. Yes I have one but it needs to be dyno tuned.
Rough estimate and don't quote me on this but I have seen 30 -55 HP gains depending on the type of fuel system, and high compression pistons, I believe cams are neccessary also to achieve that kind of power....

 

If you use stock cams on a modified fuel system more than likely the engine will run rich and won't pass smog.

 

not worried about smog, tn dont do any of that here, i dont even have a cat. on the car. so i still need i have on the list:

ka24e forged cp pistons
crower connecting rods
ca18de titanium retainers
apexi safc
performance cams
fuel pump
injectors
and also going with a new stage 3 clutch master (centerforce dual. giving in)
and another $1500 to put it in

so im still looking at $4500 with install. wow, i will have around 300hp at the wheels though. it will take a little while to get that money up, i lay marble, granite, and tile for a living and live in tn so things are cheap here. so i should have it all in 2 months after bills, including install. what do you think of jwt cams?

 

hey nick im in knoxville... if you have any problems questions or need help with your motor let me know... i dont always have a lot of time off of work but i can work it out... let me know if ya need a hand...

 

thats cool, but if i dont, when i get it done i wouldnt mind going over there to show off the cars.

 

cool.. i just have to get mine going again... as soon as i find another head... finding that hard to come by these days...

 

wow, a tennessee member trifecta.

don't know where greenville is but if its close to nashvegas give me a shout.

and to your original question, i'm in agreement with those above that your pretty safe getting the next size up pistons. unless your cyl walls are in bad shape and requies more than the standard overbore your golden.