Michaelove

Will installing new coil packs after the FC install/tune affect the FC negatively?

The car is a 1995 240sx with an RB25DET and we're having some problems with it, it's a common problem we're experiencing with some weird quirks. The Car RB25DET Stock ECU (for the RB25, not a 240 ECU) Rebuilt t3/t4 turbo Greddy Front mount with custom piping Apexi n1 BOV Blitz cold Air intake Blitz NUR spec exhaust Custom down pipe Custom test pipe Walbro 255 Fuel Pump HKS electronic boost controller Apexi Air Fuel Controller The problem Stuttering/misfire/hesitation above 4500RPM under full throttle. Previously the car had major problems ever getting above 5000RPM, so we started diagnosing and hunting down known problem spots and eliminating them in order to try to fix this. Previous Attempts to Fix the Problem Replaced Spark Plugs Clean & Silicone the coil packs Upgraded fuel pump Cleaned the ICV Did minor tidy/restoration work all across the engine bay Reset the ECU Repaired many vacuum leaks Responses We tested the coil packs just recently, all of them were between 1.1 and 1.2 ohms, we put silicone all over the coil packs to prevent arcing, and it alleviated the problem some but the car is still not perfectly driveable. Under full throttle in any gear, upon hitting 4500RPM, the car hesitates/misfire/etc. So we decided to play around a bit, we know that if we slowly work our way up to the higher RPM's at half throttle, we can hit 5000, and if we go full throttle AFTER 5000, the car will hit 7000RPM with a small amount of misfire but it's MUCH better. In third gear, there are some problems after 5000RPM but nothing major compared to before, where it would not accelerate past 5k under full throttle at all. What do you recommend the next course of action is, currently we're getting a PowerFC and a tune next week but if there's something we need to do before that will not be fixed by the PowerFC/Tune, we need to know before we make arrangements, is this problem easily alleviated by something simple? Should the fix be done BEFORE the tune? Or can the fix be done after the tune? We have searched but haven't found something like this, there have been similar threads but maybe someone can offer some more insight.

Thanks

would be best for an RB25DET with a t3/t4 turbo, 12 psi? I have done searching and have seen sooo many different answers. So, could someone give me the part number for the correct ones? NGK Coppers. Thanks

my car doesn't missfire during idle or anything though. how do I tell if my coils are dead? what kind of spark plugs would your reccommend?

I've tried my local forums but no one can come up with an answer, so I thought i'd ask the pro's Anyway! When I give my car full throttle, after about 4k RPM's it misses like CRAZY, I have absolutely no power then. But if I give it say, half throttle, I can reach redline much much easier, with slight missfire. I'm not sure if this it because of not enough fuel, no spark, boost leak or what. Maybe i'm hitting Rich and Retarded? RB25DET t3/t4 Turbo 10psi of boost I need new spark plugs, so I'll also ask which spark plugs I should get. Anyone have any similar problems? Any help is appriciated. Thanks!