strange PROBLEM, need advise!!!!!
 

after i got the wastegate fixed, i am having a strage problem.

when i hit full boost (10-11psi) at 5k, the RPM needle starts to jump up and down between 6k and 9k, most of the time the car feels OK while this is happening. BUT sometimes there is a POPing sound from the exhaust between 6k-8k. (when this happens, i let off the gas).

Re:strange PROBLEM, need advise!!!!!
 

your motor is fuxored?? ???

Re:strange PROBLEM, need advise!!!!!
 

Well it passed the compression test. avg 200 psi across.
I fixed the popping sound by giving it more gas at higher RPM band. (-35 on VAFC)

i am still having the strange RPM needle jumping between 6k and 8k.

Re:strange PROBLEM, need advise!!!!!
 

that is pretty weird..... hopefully someone else posts.

Re:strange PROBLEM, need advise!!!!!
 

The tachometer is an electrical guage. It gets its signal from the distributor ignitor. My best guess is that maybe your ignitor coil/dizzy or tach guage are going out slowly. Maybe your tachometer guage can't handle the increased pulses per minute from a greater rpm advancement period, now from boost at high rpm. Just guesses.

Re:strange PROBLEM, need advise!!!!!
 

Yeah, check your wiring, how many miles on your distributor. What car is this in?

Re:strange PROBLEM, need advise!!!!!
 

96 integra, 99 SI ECU, OBD-1 JDM 2 Gen B16A (came with no distributor)

i used the outer casing of a 95 delsol dohc VTEC distirbutor, and the inner parts of my 96 LS distributor. :-[

it ran fine no problems for months, until now...