i was wondering on what rpm does the vtec start on the k20a3 for the ep3.. thanks.. God Speed.. Happy New Year every One!

 

K20A3
Found In
2002-2005 Honda Civic Si (EP3)
2002-2005 Honda Civic SiR (EP3)(Canadian version of US Civic Si)
2002-2006 Acura RSX (none Type S)
Displacement: 1,998 cc (121.9 cu in)
Compression: 9.8:1
Power: 160hp(120 kW) @ 6500 rpm(SAE net J1349 Rev 8/04)
Torque: 142 lb·ft (193 N·m)* (191 N·m) @ 4000 rpm(SAE net J1349 Rev 8/04)
Redline: 7100 rpm
i-VTEC Engagement Window:4700 rpm (i-VTEC is only available on the intake camshaft)

 

Sorry my friend you know nothing about the K20a3 motor.

K20a3's i-VTEC engagement point is 2200RPM, super low in the powerband. The feeling of hard acceleration is due to the VTC adjusting the timing at around 5000RPM. This is what most newbie EP3 owners mistake for VTEC kicking in.

 

Here is some more info on i-Vtec and i'll see if i can find more on the k20a3. If you want to get more info on the motor specifically you can either go to k20a.org or epahtch.com to learn more.

I copied this from Honda's own website. I hope it helps.

i-VTEC System
The latest version of Honda's acclaimed valve-control technology, the "intelligent" i-VTEC system combines Variable Timing Control (VTC)--which continually adjusts intake-camshaft phase--with Variable Valve Timing and Lift Electronic Control (VTEC), which changes valve lift, timing, and duration. The result is 160-horsepower at 6500 rpm, 132 lbs-ft of torque at 5000 rpm (a 20 percent torque increase over the previous Civic Si), and exceptional operating efficiency.

VTEC (Variable Timing and Lift Electronic Control)
The Si's VTEC system uses two roller arms per pair of intake valves. During low-rpm operation, intake air is drawn almost exclusively through the primary intake valve, thereby creating a very strong swirl effect to maximize combustion. At higher rpm, the secondary rocker arm engages the primary roller, opening both intake valves for the same lift and duration, substantially increasing airflow into the cylinder and boosting performance.


VTC (Variable Timing Control)
The i-VTEC system adds a new camshaft VTC (Variable Timing Control) system to VTEC for continuously variable camshaft phasing across the engine's entire power band. As engine rpm builds, a VTC actuator--controlled by an engine-control union that monitors cam position, ignition timing, and throttle position--advances or retards the intake cam throughout the 50-degree timing range, optimizing engine output and reducing emissions.


Also, the April/May issue of Honda Tuning Magazine has a great article on the new K series engines.


http://www.ephatch.com/forum/showthr...highlight=vtec

 

^nicely put

 

Sooo...true...Is it too late to laugh?

 

Its never too late to laugh, I get on here to get a good laugh when im bored. LOL

 

Yeah. I wish our cars made 142 ft lbs of torque stock. I knew it was around 130 though. And boy does it feel good when compared to driving gutless B series. I would give up the 10 HP more a GSR makes for 20 ft lbs of torque any day. :D

 

k20a3's are gay thats the biggest waste of money, if ur goin k20 get a a2, z1 or z3 but a a3 thats like havin a d17a2

 

Actually, it varies depending on a number of factors. The 2200 RPM engagement point is for WOT/high load conditions. It can engage later under light throttle.

VTC is constantly adjusting the intake cam phasing; it doesn't happen at any particular set RPM.

 

this coming from the guy with a ex........

maybe the op isnt trying to swap, maybe it just came in the car and wanted to learn something.

 

no papa' u see im not cheap like all these other n!gg@s I got a K20Z1 in my ex and I eat a3's for a snack

 

what other "****@s" are you referring to? Its good to know that you eat a3's for snacks, do you also live your life a quarter mile at a time?

 

ok fast and the furious whats the next question do i know how to granti shift and double clutch when i supose to? LMAO

 

i jus wanna stay true to the ep3 engine thats it.. thanks for all your opinions by the way.. thanks.. God Speed..

 

Watch your language and take it as a verbal warning! I will not tolerate that kinda of talk!

If you don't know the rules maybe you should re-read them...

 

Sorry, But I just have to laugh...again...really late...

 

lulz me too...

eats A3's for breakfast. ha! ya bro that extra .10th second really adds up.

 

You want to see what the K20a3 is capable of against more powerful engines take a look at my vids on youtube. Just type in my screen name and talk more crap about how gutless a k20a3 can me. Sure the car doesn't have tons of power, however if you can make up for that in faster cornering speeds you don't need the power.

I road race, none of that bs street racing.

So if you want an idea of what can be done on a lightly tuned K20a3 here you go:

Click ahead to 4:40 mark.
http://www.youtube.com/watch?v=wUQ36kq6zzs

http://www.youtube.com/watch?v=AjM3jJHTmas

http://www.youtube.com/watch?v=P86EzWBm6Yk

I have plenty more of what 160whp and 130ft lb can do.

 

the clips don't prove much because nobody is going head to head. you and your instructor even said in the 1st video, the vette's drivers were probably novices. probably learning the car/track.


You can't win a race when you're the only one racing. all you proved in those vids is that ANY car (no matter what power) is fun on the track. but the same could be said pretty much about any Honda.

 

The Road America vid was only to prove the theory that if you don't know what you're doing. That power isn't the answer. No matter how fast you go in the straights, if you don't know how to corner fast all that power goes to waste. That's just a good friend of mine whom happens to be a professional driver. He was giving me some pointers on the course, other than that we were just having fun.

 

don't mess with igaly.. he'll literally eat your k20a3 for breakfast..

 

that is soooo true....
even the drift king (keiichi tsuchiiya) himself said "There's tension on the track, now you see how hard it is. You may be fastest on the street, but unless you know the track, you're not good enough to sit behind the wheel."

and whats the point of being the fastest in the straights when you cant turn

 

I made a license plate frame that says "Sorry, I don't race morons on public roads. Join SCCA" because I got sick of having boy-racers rev their engines next to me at traffic lights.

Great vids, by the way. I used to go to RA often when I lived in northwest Indiana. IMSA, AMA, CART... But my favorite was the Historics. There's nothing like seeing a McLaren M8D CanAm car blasting under the bridge at full song.

 

Lol I laugh at this thread. Anyone can street race and slam through gears like a mad man, thats easy and takes no skill. Anyone can take off at a green light and go from 1st gear to 2nd to 3rd and so forth. It takes a real driver to be able to handle on a track, knowing exactly how to take the turn to not lose power. If you street race how about stop putting lives at risk at take it to the track.