that's not always true. I reassembled a money shift back in June. VTEC did not engage at all. No codes, and the car will make redline, albeit with a wheezing effort and possibly a backfire here and there. Turned out the Assembly lube galled in the VTEC pins in the rocker arms. Once cleaned, VTEC returned, but I never did have a code, in fact I drove it from Florida to Ohio like that with nary a problem sans no VTEC.

 

These cars don't make a well pronounced roar when VTEC engages (unless you have a CAI). Just as an experiment, take the lid off your air box and take it for a spin. The weather is prolly cool enough that you won't suffer from heat bog and lose horsepower. The experiment should be done at night, and on an open road with no traffic, so you can keep the car moving, so as to keep air flowing from the front of the car. This is just an experiment, as the lid is there for a reason.

Do this, and tell us you don't hear a roar

Off topic. I used to have a Del Sol with the B16A3 engine. VTEC engaged at 5,400 rpm's. When VTEC engaged in that car, it literally sounded like a Lion

The sound of VTEC in my S2000 is nowhere near as pronounced as my Del Sol.

If your still not convinced, get your car dynoed on a dynometer with another owner.

I still think your car is just fine.

 

Listening to all this feedback that his Vtec is fine and that he must be mistaken is really annoying to me and sertanly must be for the guy with the problem. Doesn't anyone else have this experience? Its not always a simple fact of "getting use to it" when you drive your car daily, you may be come board with the power output but you are also usually very adept at feeling anything that may change or feel different about the car since you are so use to how it drives on a daily basis. If you feel a sudden loss of power one day, you probably did. My car even after all the great power adding mods, fluctuates almost daily. I just except that there are other factors at work that I don't have much control over. Such as weather. S2000 is a very sensitive car and it has allot of fail safe computing that tame the power at times. Once the car is up to running temp, so that the fail safe mode of shutting down the car is deactivated, the car will go to red line even if vtec doesn't engage, so that is not relevent information. Something is clearly not operating fully with your vtec.

This scenario is a tuff one for people to pin point and understand it seems. I have owned my Ap1 for many years now and in the early days before any modifications I would notice what your describing with the car just not pulling in vtec at times. Vtec is more concentraited in an Ap2 so it would be even more noticable if something changed, so I believe what your experiencing is true. There is something not 100% right. This problem I was experiencing was frustraiting and confusing for me, but the more I started to pay attention, the more I started to see some patterns.

The valves in Vtec mode the way I understand it don't suddenly kick in, they are always running with the motor. All 4 valves that is. This seems to be a misconception. I thought at one time only two run in pre vtec and then the second set start working when vtec kicks in, this is wrong and may help you to think about what else could be causing the problem or give you some other questions to ask.

When Vtec kicks in, the cam pin that is controlled by oil pressure engages a different set of cam lobes which increases lift and duration, but in pre vtec all 4 valves are still in operation but at the econo profile. There are several factors that can cause vtec to not work and there are more that I am not aware of i'm sure, which is worth researching somewhere else other then this thread. Low oil, bad/dirty oil. Vtec silinoid screen clogged or not operating properly. Atmospheric/weather conditions. Altitude change. Hope this helps direct you better towards resolve.

 

Unplug your VTEC solenoid, rev it up to 7 plus thousand rpm's, and then report back to us



Mine doesn't roar. It doesn't have a huge kick when VTEC engages and my car runs like a thoroughbred racehorse.

If you read my last post, I gave the thread starter some viable options of determining his cars performance.

I never said he was mistaken, I simply stated that I think his car is fine.

 

[QUOTE=jbeni96,Dec 11 2007, 05:38 PM]I realize that my VTEC is in fact engaging.

 

I also have the same issues in my ap1- i can take it out in the morning (50 degree ish) temp and the car runs like a race horse- now on that drive home from work (usually anything above 75 or 80 degress)- my vtec kicks in- you can just barely feel it. Replaced tdc, new air filter, cleaned vtec solenoid-0 now i jsut attribute it to having a car that revs to 8-9k and all the stoploss measures honda has to put into place to keep things like detonation and such from happeneing. Abyone else noticed this?

 

A lot of peeps in S. Florida and S Cali have reported heatbog in warm/hot conditions. Heatbog has nothing to do with VTEC.

 

my experience with this similar problem went like this: vtec kicked in great; dealer replaced tct; vtec kick gone and no code thrown; back to dealer; checked variables, such as pressure and temp--all fine; replaced vtec solenoid; problem solved, kick at 6000 again; my take--tech knocked, bumped, hit, damaged solenoid (close in proximity to the tct). if i'm wrong, i don't care at this point 'cause the thrill is back. oh, my car went to redline and was smooth, but vtec was definitely not working, so don't think that one day it kicks, the next it doesn't, yet all is well.

 

Sorry but you are very very wrong.



If your VTEC was NOT working properly, your car would not be smooth above 6k rpm's, much less at redline

Apparently, you did not read my post's. Do yourself a favor, unplug your VTEC solonoid, try to rev it to 8k rpm's, then report back with your findings.



That is my whole point, but people just can't listen. It either works, or it don't. In your case, the fact that you could smoothly go up the rev range all the way to redline, it was working properly (VTEC that is).

Why do I even bother

 

Im curious! Car is in storage tho, so cant do the unplug thing....


Chad