R34 Boost Problems

[34skyline]

got my r34 with fmic, 3.5 inch exhaust and pod filter. fitted a apexi neo to it and made some difference with a tune. now the problem is i have tried to boost it past 12psi and it seems to go backwards like its retarding the timing or something. What im thinking is it has someting to do with the extra buttrtfly in the throttle bodie. Dont know not to sure what to do, will the z32 make a difference? not sure what to do guys. Any ideas?

[Benzino33]

u tried doing a search? I think your car is having Rich and Retard. ur not meant to boost past 12psi on a stock ecu. turn the boost down and it should be fine. Dont think the z32 will make a difference. if u wanna run more boost, u should get a power fc or another aftermaret ecu,, or get yours remapped

[34skyline]

u tried doing a search? I think your car is having Rich and Retard. ur not meant to boost past 12psi on a stock ecu. turn the boost down and it should be fine. Dont think the z32 will make a difference. if u wanna run more boost, u should get a power fc or another aftermaret ecu,, or get yours remapped

ok thanks mate

[R31Nismoid]

Any further than 12psi will kill your turbo and not really make anymore power anyways so why are you bothering?

Set it to 11-12psi, get the NEO tuned PROPERLY - And i say properly because correctly done, you will not be hitting R&R which it sounds like you are

[MrR33666]

the afc neo should stop over fuel and retard

i would be looking at getting that retuned

but keep the boost at 10 - 12 psi

[paulr33]

The R34 has two levels of protection, the first one is the normal excess airflow - ie too much airflow, the ecu cuts out the timing and dumps in heaps of fuel, this occurs when you run more boost. the second is the maximum boost level. the ER34 ECU has a map sensor which it watches to see what the boost pressure is, if its too high, it cuts the timing and dumps heaps of fuel.

so to avoid that you need to defeat both protections

i cant remember how to beat the map sensor protection, but im sure its been done to death before, ask someone who has an ER34 or do a search

the excess airflow is easy, you just fit an SAFC or AFM signal bender to cheat the signal and ECU doesn't see the full amount of airflow coming in - thus avoiding the protection