i have a 90 ef and i'm using my stock engine harness but distributor plugs have been converted to OBD1 and the inside theres OBD0 to OBD1 jumper harness with a P72 OBD1 ECU. Vtech kicks in at 4500 rpm but it don't seem to gain much power out of vtech. any one else have this problem? how do i fix it?!

 

well you have a gsr ecu running a b16 ecu, ever think that could be your problem? the gsr ecu is also going to be looking for secondary butterflies which will not be present on a b16 intake manifold. its vtec btw, vtech is a phone.

 

well my brother has his eg with the same year of b16a2 with the same ecu n his runs strong thats y i cant find out what it could be

 

I am running a p06 ecu that has been converted to vtec but im also not gaining too much power could that be the ecu or should i get a tune for the cams i dropped in...

 

what kind of cams? You really need to get a tune especially if you get bigger cams, as you might be running lean which is bad for making power and for the motor in general.

OP are you throwing any check engine codes? Do you know if VTEC is actually working?

 

Get a tune and have vtec hit around 5800 rpm's 4500 way too low

 

the stock vtec initiation is not to low. honda knows what they're doing better than you do. the only reason why you'd raise that vtec crossover point is if you changed cams and they made more hp/tq at a different rpm band.

 

^^ read above lol.

4500 is the stock crossover for a b16..5800 is more like a GSR.

 

the tail pipe being to small will that make the engine feel like vtec dont give it much power?...also obd1 p72 ecu in my ef b16a2 its giving me a code 23 for knock sensor but when i turn it off the code goes away n dont come on till like 15 mins after the car has been running??..how can i fix that?

 

His ECU is probably chipped to remove the IAB or secondary intake.

Stock ECU are tuned at the factory for a specific engine, so I don't know why people think that they can just slap it on a differently spec'd motor and expect it to work flawlessly.

Back to your issue, you should try to use a correct ECU for your B16 or have your P72 chipped and tuned properly for your motor.

Actually, Vtec crossover point for GSR is also around 4500 rpm. What people hear at 5500rpm is the sound of secondary intake and think that's Vtec. Some even went on to pronounce to the world that GSR has two-stage Vtak, go figure.

 

Yeah for some reason I always thought it was later in the power band for some reason but on me since my p28 is chipped with a GSR map and vtec engages right around 4800 lol.

 

NOT

 

Yup. 4400.
I have a P28 in my hatch Vtec cracks at 6gs. Which sucks. I want to get a tune here soon.

 

i got a virgin P28 for sale too. Lol!

 

no his ecu isn't chipped. i swapped both ecu's from his car to mine and mine to his and its still doing the same thing.