hey i was just wondering if a BNR stage 3 turbo will bolt up and work properly with the stock ECU, and with 255lph fuel pump stock primaries and 720cc secondaries. thanks

 

i think your gonna need some kinda of fuel management mayb a SAFC or Rtek or you could go with a megasquirt...
TwEaK

 

that would be fine for maybe 5-6psi of boost, if you plan on pushing the turbo to its full potential you will need a bit more fuel than the 550's and 720's.

also once you go so far it is wise to chuck the stock ECU and run a standalone so your timing can be adjusted to compensate for boost levels.

 

i think mayb 4x 720's and an SAFC with a walbro should be fine =)
TwEaK

 

ok i am currently runnin 12 psi on the stock turbo w/ 720cc (or 850cc original owner told me 2 different sizes so im not sure which one they are) 2ndaries and stock primaries, street port, after market turbo manifold ( i think SS autochrome) cone filter, 3 in. RB DP. , No cats, Apexi N1 single catback exhaust, FD rotors, 255lph fuel pump, stage 3 RB clutch, solid motor mounts, fuel prssure regulator, and i think thats it. im looking at gettin a Saf-C for temporary use until i get a haltech or microtech. so what size injectors would u recomend? i was thinking of moving the 720's to the primaries and getting 1000 or maybe 1600cc 2ndaries

 

problem with the stock ecu and a larger turbo is you need more fuel but the startup enrichment cannot be changed, personally i would suggest 720cc primaries and 850 secondaries for that setup since you cannot have a huge bridge between primary and secondaries. this should be enough fuel but may not be depending on what other mods you have and plan on getting. 720's all around would probably do ok but more is better for safety precautionary measures, your tuner should be able to tell you if you are running the threshhold for the injectors duty cycle or not when the car is in the tuning stages.

with the 720cc primaries the car will be tougher to start even with a kill switch.

 

ok and how about the bnr stage 2? how will that take the stock ecu?