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VTEC questions.

 
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Old 07-07-2008, 12:33 PM
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VTEC questions.

What rpm does V-tec engage? i just bought a 5th gen, how do i know that its working? is it a really noticeable difference in power? (like a turbo)? i guess im v-tec stupid.
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Old 07-07-2008, 12:34 PM
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Dude, use the search button and resources. For that i'm not even gonna answer :)
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Old 07-07-2008, 12:35 PM
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Oh and its VTEC ;) Thank God you didn't spell it with a K!
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Old 07-07-2008, 01:21 PM
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I searched this forum for vtec in thread titles and theres like 10 threads. My question is more specific. People on prelude forums are like "wtf my vtec doesnt work", well ive never felt 'vtec' so is it hella noticable like a turbo? or is it just a little more torque? Above 5000 RPM my car is not amazing or anything. Beyond 4k it has alot better torque.
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Old 07-07-2008, 01:26 PM
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Okay, you have a 5th Gen correct? Do you hear a tonal change from 5500rpm upwards?

What you are describing above 4k sounds like VTEC pulling you, 4000 - 4500 is torque peak followed by VTEC engaging at 5500rpm (my auto engages here).

Its not a massive rush like a B16 which is more noticeable.
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Old 07-07-2008, 01:28 PM
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Take a look here at a 5th gen engaging VTEC at 5500rpm. The sound from the intake changes a little and the needle moves a little quicker to red line due to the cam profile while in VTEC.

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Old 07-07-2008, 01:28 PM
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What do you mean vtec pulling me?
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Old 07-07-2008, 01:31 PM
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Actually the H22A4 has one of the more noticable stock VTEC engagements of any Honda. the engagement feels harder than the S2000's VTEC band (F20C/F22C) and certainly any of the newer iVTEC K-motors.

The stock tachometer will read about 5,500 rpms when it engages. You MUST be at full throttle (gas pedal floored) for it to engage strongly. You will mostly feel and hear it engage in 1st and 2nd gears. If You can't feel and hear it hit you may have a bad VTEC solenoid...it happens...especially if the motor has always been fed conventional oil and possibly run low on oil a few times (very likely since this motor burns oil like a fat kid in cake).

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Old 07-07-2008, 01:35 PM
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Are their test procedures for the solenoid and the engagement of the whole system?
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Old 07-07-2008, 02:03 PM
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Quote:
Originally Posted by imloggedin View Post
Are their test procedures for the solenoid and the engagement of the whole system?
Yes. Get your hands on a .PDF copy of the 5th gen Prelude Helms manual. I'm sure a search on this site would yield this for you.

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Old 07-07-2008, 04:29 PM
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Quote:
Originally Posted by nitrogen View Post
Take a look here at a 5th gen engaging VTEC at 5500rpm. The sound from the intake changes a little and the needle moves a little quicker to red line due to the cam profile while in VTEC.


Someone loves there vtec.

Come to Jacksonville, FL. Ill show you what vtec runs like. its noticable
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Old 07-07-2008, 04:38 PM
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Hehe well there you go :) an invite for first hand experience.

Brian > Send me a pm on what you do at Auto Cad Tech, saw it in your sig. Cheers.
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Old 07-08-2008, 11:33 AM
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I thought it kicked in at 5200-5300 rpms on the H22A....maybe i was misinformed.
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Old 07-10-2008, 10:10 AM
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under a stock ecu the h22a vtec should pull at 5500 RPM's, you can change the engagement of vtec by getting a programmed ecu. like 4800 and 4600 rpms. Also not to bust on you but you probly could of used google to search your question. BUt i know some times that can be a pain.
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Old 07-10-2008, 04:58 PM
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Yah it works. I see what you guys mean about when it engages. Sometimes it pulls harder than others and seems the strongest in 2nd gear.

And I didnt google it much cause i doubted that the engage point was the same for all vtec engines.
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Old 07-10-2008, 06:57 PM
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Correct.

The crossover pont also caries depending on how hard you are on the throttle.
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Old 07-15-2008, 04:18 PM
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Also depending on your tranny is how hard it will pull. The gearing in the h23 tranny would wind out easy the vtec would pull alot harder. The f22 tranny was nice because pulls pretty hard and you get some time between gears. I have never driven a 5th gen so i couldnt tell you. Also someone correct me if im wrong but i think vtec changes between and auto and man tranny.
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Old 07-17-2008, 07:01 AM
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Vtec engages at about 5300 to 5500 rpm. The effect of when it engages is different in certain situations like others have mentioned.
1)Not having the pedal flat to the floor doesn't seem to engage as strong(logically).
2)First and second engages with a better effect but I guess that makes sense it will feel weaker in the higher gears.

Vtec is nothing like a turbo, more like powerband. The exhaust note is a dead givaway especially with aftermarket catback exhaust :).

Technically I can't have any input on why it wouldn't work but I can say that looking at alot of threads that the vtec solinoid being faulty seems to be the common thing
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