i have a b20vtec just swap for some reason i cant rev pass 5600 rpm even just reving in nuetral cant hit vtec so i cant tell if my vtec is working

 

do you have some sort of launch control set? if so, does your speedo work?

 

no check engine lights huh?

 

yea no check engine light what so ever and no launch control

 

whats the ecu setup?

typically (i believe stock ecu's) do not allow you to hit vtec when revving in neutral, nor if your ect is up to temp.

 

you should pull a plug off one of your sensors to test your check engine light bulb. sometimes but rarely they burn out

 

killerpenguin's right you cant hit vtec in neutral, wait utnil the car warms up and then go see if it goes past 5700 rpm

 

i know this is trying to hit vtec rolling and the it does the same thing cuts off at 5500 and after that i just sit there in nuetral and rev up it would cut off at 5500 and its a s300 ecu too

 

S300? sounds like a launch control to me..Or the ECU is going into safe mode..Just guessing.

 

Jim oh Jim...

 

I think it's in safe mode did the same thing with another ecu people said try changing the map sensor would that be the problem

 

i vote check your speedo. mine did that wouldnt rev past launch controll setting rolling or stand still. no check lights. turns out the bracket was broke and it turned about an inch. turned it back revs to 9k

 

I myself have a similar problem. I have a 2000 automatic integra. I converted it to manual with a b20z and a type r lsd tranny. Car revs fine with auto ecu obd2.However I converted it to obd1 with an obd2b to obd1 harness alongside a 1995 obd1 p75 manual ecu. And now the car wont rev pass 5500. It hits 5500 but then just goes down and picks up again. The problem only persists while with in obd1?

How do I fix this?

Thanking you in advance

 

vtec related??? try checking the filter mesh inside the vtec solenoid see if its clogged with crud...unless the s300 map has the vtec pressure switch disabled???

for vtec to engage usually you need speed signal from VSS, pressure to vtec press switch, throttle at WOT (TPS)...