Zhestokus

Yes i had do that i had set key on position ON when Throttle body and some other sensors was unplugged, after that i had problems with Fuel/Air ratio(poor mix) and after all of those changes i have reseted ECU and started all learning procedures (Closed throttle position learning, Throttle position on XX learning and learning Timings)

Thanks a lot It is really good idea I will test/check everything you mentioned

i hope there is no problem with car and it was my bad driver skills :D

yeas i'm sure, he have Nissan Skyline V35 300GT 2002 but his car millage is 85'000 KM and my car millage is 180'000 KM both are JDM (from Japane) BTW i have removed EGR, i mean i to have get header (with electronic part) of EGR and connected it to jack (i know this is not good idea but i think it is better then dirty intake plenum) :D maybe after all of above changes i need Fuel/Air Ratio Controller? will on that car fit e.g Greddy E-Manage Blue? or maybe problem is Differential (e.g need change oil) ? i'm planning to change Differential (because as i know sedan with AT have diffs with ratio 3.15) and install diff of Skyline 350GT Coupe AT (with 3.35 ratio) i have no idea what should i do :D

Hello all i have some problems with my car (Nissan Skyline V35 300GT 2003) i have made some tuning works i have installed Intake Plenum Spacer, Throttle Body Spacer, changed Z-tube with K&N air filter, changed Exhaust Header Pipes, Down Pipes and installed full dual Exhaust (i mean exhaust is without Y-Pipe), removed fuel filter in Fuel Tank and installed Universal JDM Fuel filter, installed groundig KIT i have checked my car on Dyno and output was 212WHP which is 300HP (Engine output, 300HP because owner of Dyno sad me his dyno shows 1.13% less output than others) and Torque was more then 380NM (i don't remember exact number , my friend tested his G35 Coupe and his car has 380NM and i remember my has more ) i found formula WHP = Crank HP * (1 - driveline loss) Say you suppose that driveline loss is ~20%. WHP = Crank HP * 0.85 Crank HP = WHP/0.85 so 213*1.13=240.69 240.69 / 0.85 = 300.8625 but few days ago same model (but fully stock) overtook me i have no idea what is wrong with my car below is images about what have i done with my engine but some photos is old, at this time there is grounding kit and around of Z-Tube is thermal isolation Mercedes AMG exhaust fits with minimal redesign