1997 JDM S14a with a sr20DE, 5 speed. Completely stock.
Concern- at WOT most noticeable in gears 3-5, at around 4000/4200 ish I hit a wall and the car will decelerate (while continuing to hold WOT), if I let off the pedal around 65% throttle it'll kick back in and rev perfectly fine all the way to 6k(I shift here because I don't feel the need to rev higher). I can watch some data through the Yashio Factory version 1 display I have, and if I keep throttle voltage at around 2.3V and climb through the RPMS it won't happen, only from 2.5-4.1v it seems like the ECU is commanding fuel cut.
This car has only 122000 KM on the odometer, extremely clean
New plugs/wires, cleaned up cap and rotor
Base timing set dead nuts at 15°
Idle set to 850
TPS voltage set to 0.47v(also measured with Scope and see no drop outs)
MAF has been cleaned and voltage readings not dropping out when this is happening.
Verified yesterday, 0 intake leaks.
Vehicle speed isn't capping out as I can let off throttle and increase.
I unplugged knock sensor no change
Unplugged VTC no change
Fuel filter looks brand new, but again it happens at a specific rpm/specific TPS position, so I really can't put money on it being something mechanically wrong like the fpr or filter as it has no sensors attached.
Im really curious if the timing of the cams is one tooth off possibly on the intake? And throwing cam sensor a faulting reading?
Idles really well, tho every once and a while it's gives a little shake, to me these 4-cylinder engines should be extremely smooth, so that's also another concern that could be related.
I want to have this engine running perfectly, before I decide to either do a +T or just save more and do an RB swap. Any help is greatly appreciated
