Hey everyone i just had a quick question! I just resolved a problem i had with my cars vtec.. Ive never ran this car w/o my vtec controler on. I have always setup the h22 to enage at 5000. the ecu i have in my car i bought off ebay and it was jun chipped i believe like a 5700 or 5900 vtec engagement and what not. Well tonight after figuring out why i was getting a vtec oil pressure code. I took it out for a test drive.. w/o the vafc on! It just didnt seem to roar like it does at 5000 or pull anything like it.... Is this normal and indeed that you can have vtec engage to late? im hoping that there is not something else wrong.

 

Yes

 

the ecu determines the rpm that the VTEC will engage.
it is based on several factors that the ecu is monitoring
the stock cam changeover for the h22 is between 5000 and 5500
it is not a fixed number

the intake air temp
the coolant temp
VSS input (wheel speed)
head oil pressure
knock sensor
and several other variables the the honda calls "ecu calculated engine load" (basically fuel and timing settings)

determine when the VTEC will engage

btw what turned out to be the problem with code 22?
im curious, was it wiring

~kris

 

proly was faulty wiring

 

yeah kiss my ass! lol... who would of thought they split off the vtec solenoid and A water temp sensor in the same spot?? The vtec pressure switch wire was about a foot away! I could believe it when i saw it.. i still dont! My car worked all this time with a water sensor to it? So when I did my swap I though hell the switch is right next to the solenoid they must come out at the same point as on the harness! oh well.. thats why when i checked for voltage and what not it was working.. because it does work! check out my other topic to see more info!

 

The reason I asked if you could have vtec engage to late is because that ecu is setup for like 5800 or so engagement! And I just wanted to make sure.. because its set so late that it could lose a bunch of power and it doesnt rev up as fast..... like it did before when vtec was engaging at 5. Does that make sense to you?

 

it runs good and everything.. and revs strong till vtec.. and when it kicks in at the 5900 or what ever exactly it is.. it breaks off and doesnt rev as fast! Before when vtec enaged at 5000 it would rev stron and as soon as it hit vtec the tires were spining and revs shot right up to 8000! Now it seems to struggle to get there!

 

oh and Vtec was super loud before! now its a small low tone..
I honestly never drove the car with this ecu set at its preset enagement! I always had it controlled by my v-afc

 

Does this make sense? Anyone?