Post by
TurboKA37 »
https://forums.nicoclub.com/turboka37-u7969.html
Sat Jul 12, 2003 8:57 pm
well im not really sure what the problem is with the idle and stalling but u will have to upgrade ur fuel system if ur running boost. a few different ways u can do this:1. get a FMU which is a devise that adds a certain amount of fuel pressure to the fuel rail for every psi of boost. this option is only safe up until about 7 psi of boost because it will add ALOT of fuel pressure to ur fuel rail. ex: a 7:1 FMU offered in the NSport kit adds 7 pounds of pressure to the fuel system for every 1 psi of boost. id say it is ok to run a FMU if u want a quick fix while u wait for another source of fuel upgrade and r not running over 5-7 psi of boost.2. JWT ECU retune which is where u send ur ecu into JWT and they will retune the ecu for larger injectors. Pros: it is a plug and play system, u will not have to do the tuning, and no trips to the dyno. Cons: it is quite expensive (near $600), u will be without a ecu for a couple weeks while it gets retuned, and they seem to tune the ecu a little on the rich side for safety reasons. Many people on these forums go with the JWT retune so it is a prooven way to safely run upgraded fuel system.3. buy larger injectors, a piggyback system, and tune urself. this is the way i think i will go. buy some 370-440cc injectors and a piggyback such as the S-AFC II which u will need to individually tune the amount af fuel going to the injectors at a rpm.4. hacked MAF which where u increase the diameter of the intake piping going through the MAF. then u take the difference that u increased the diameter by(lets say u increased the diameter by 35%) then u increase the injector size by the same %. i forget what stock injectors are sized at but lets say 275cc, so u take 275 x 1.35 = 371.25 then u go out and buy some 370cc injectors and u will be adding 35% more fuel and u will be sliding 35% more air past the MAF so the A/F ratio stays the same. u prolly didnt understand that but there are a few people on these boards that are using that method. all these different ways of adding fuel i just mentioned should be accompanied by a larger fuel pump cause stock fuel pump will not beable to support that much fuel. if u have anyquestions please ask i kno i prolly forgot sumthing