TSXCoot

I had an interesting experience with a loaner while my 05 CGP AT (no mods) was in the shop. They gave me an 06 AT loaner with about 16K miles on it. The power at the vtec point was completely different (read 'better') than my 05. I was stunned that the car really jumped into another mode, accelerated hard and was was a lot louder than mine at higher rpm. I have read countless cases on the forum of people diggin' the vtec but frankly, my car had no different pull or sound as I pass 6000 rpm. I patiently wait for it to wind up and shift heading toward 7000 rpm but it's a little bland. The 2006 car was completely different and now I know what you all must be talking about. I've been thinking that my problem was the AT and its gearing but now I wonder if something's wrong with the computer/power etc. Any ideas or smilar experiences?

Icculus

I've never driven anything newer than my 05 (6MT), and I too do not notice any VTEC transition. I've read comments on VTEC kick and sounds, and have even watched videos on YouTube where the changeover is really obvious, but no such experience in the 05 TSX. I used to wonder if there was something wrong as well, but I've come to accept the fact that the VTEC in TSX just isn't as intense as a Civic SI. Now I'd like to know if there is something wrong knowing that the 06 is a completely different experience. The fellas over at Honda probably just did a little upgrading for the newer models.

Dan Martin

The '06 has an extra 10-15hp over the '05, so that would go a long way to explaining your experience.

mltk53

ur dog ate it

Celtic FC

I have to agree. I have an 04, and feel the same. I had an Accord V6 before I bought my TSX, and i did feel when it kicked in. I just assumed it was less noticable in the TSX. Now, I have to wonder.

TacoBellSauce

those were all VTEC engines, the TSX has i-VTEC which does not "kick in" but rather smoothly engages...as for the 06, it has more horses, thats why you feel it

xenonhid

I agree, i-Vtec has different engagement characteristics.

Tex929rr

My 2002 CR-V had i-VTEC, and had a pronounced jump when the cams shifted. On my 07 TSX it's undetectable. But so what? If the system really works as designed, the change should be unnoticeable.

pnoi521

LMAO!
That sucks if it doesn't really 'kick in' cause it's pretty sweet in my TL

aaronng

VTEC mechanisms are the same except that the TSX has additional VTC on the intake cam. The reason why its smoother on the TSX is because the difference between low and high cams is much smaller than when compared to the older B16a and B18c engines.

TSXCoot

Why would someone say the 06 has 10-15hp over the 05 model? The published change is 5 more hp. Usually, 5hp is unnoticeable. If I thought even 10hp felt that different I'd be out doing bolt on mods today. I'd like to drive a 6sp and see what difference the gearing makes. I get the feeling that with different ratios (more radical than the difference in AT vs. 6sp), I'd be a lot happier on the bottom end while paying the price in gas mileage. BTW....No need to comment on how I should buy a different car if I want more power ....love the car, balance and value, actually chose this over a TL at test drive. But there's nothing wrong with wanting more ...at least 225hp

jernut

EDIT: engine codes might be wrong, this is all for memory and cannot find the information to verify

I-VTEC on the CRV engine(k24a3) and RSX base(k20a3)does no change the cam lift or duration like the i-VTEC on the TSX(k24a2) or the RSX type-s(k20a2) or newer civic si(k20a2). What it does do it keep one valve closed untill the engagement point. I believe this to be fairly low 3000rpm. Then the other valve opens up. This is purly for emissions and not performance.

on a side note. I do feel i-VTEC kick in at 6K on my 04 6M. There is no difference in sound so it is hard to hear.

jernut

http://www.k20a.org/forum/showthread.php?t=27766

Zephrem

The SAE standards changed, resulting in more than the mere 5 HP power bump. See post 5 of this thread

aaronng

If the SAE method of rating the power was not used (like the 04-05), then the 06 would have 215hp. If you rated an 04-05 with SAE standards, then it would make only 190hp.

Gilmour

Just clear up the engine codes here for US.

CRV K24a1 i-vtec on intake cam only
Accord/Element K24a4 i-vtec on intake cam only
RSX/Civic SI-02-05 K20a3 i-vtec on intake cam only
RSX-S 02-04 K20a2 i-vtec on both intake and exhaust cams
RSX-S 05-06 K20z1 i-vtec on both intake and exhaust cams
Civic SI 06-07 K20z3 i-vtec on both intake and exhaust cams
TSX K24a2 i-vtec on both intake and exhaust cams

Yeah my first post.

Black_6spd

My experiences driving a stock TL is that it's almost just as undetectable. The TL has a much more older, less tuned Honda engine with only one cam and I think it's pretty much displacement you're feeling similar to my Honda Pilot that has only vtec lobes for the intake side.

IMO, if you want to feel the vtec "kick-in," jump into an Integra Type R with a CAI. Those cam lobes didn't have any luxury intention whatsoever.

pnoi521

Well im not sure about 'feeling' it kick it but oyu can definately tell cause the engine tone changes when it kicks in right before 5,000 RPM...

godfather2

Keep in mind that sometimes i vtec WON'T engage if your engine hasn't warmed up

rb1

Actually, the 06/07 VTEC switchover is quite pronounced. The torque is starting to roll off some as you approach 6000 RPM, and then it's suddenly back just like you flipped a switch.

The effect is somewhat like having your A/C compressor cycle off while you're accelerating, a small but sudden burst of extra power all at once.

JWiner

Very true - VTEC almost feels like a low burst turbocharger kicking in at 6K. It is noticeable in acceleration and in sound. This is caused by a third and larger lobe on the cam shaft actuating valve lift (once at 6K rpms). That is the Variable Timing Electron shift Control portion of iVTEC and is only apparent on high end gains.

The "i" portion (intelligent) is where you will experience small low end gains. This is the continuasly variable camshaft phasing.

For more on this, wikipedia "VTEC". There is a great description on the history of VTEC, advancements and technical description.

jwood_06TSX

I actually did a write on this when i traded in my 04 for my 06 because it was VERY pronounced! I wouldn't say its like a turbo charger but its def a big surge of power and more so sound. My g/f was in the car with me this weekend when i hit it in both 1st and 2nd gear and she was like "i really like how it gets louder and then screams"

The engagement into 1st gear is not a kick but its def a strong pull but when you hit it in 2nd gear its a little more of a kick from what i have experienced in my car

evolpe

I'm going to have to agree with Black_6spd. I had a '97 Prelude SH before getting the TL. When the DOHC VTEC kicked in with the prelude you felt and heard it big time. It felt like going from a 4 cyl to a V6. The TL does not have anything like that which is completely disappointing. I think it's part of the reason my driving habits have changed. I now try to keep it below 2000 rpm to save on gas because getting it up over 5000 rpm isn't quite as satisfying. But don't get me wrong, the TL is faster than my old prelude, just not as fun to drive at the higher speeds.

dom

Yup, same with my 98 GS-R. it was great. I can barely feel it on my 04.

joerockt

With my intake, I can definitely hear it more then I can feel it.

jlukja

Although, the reflash makes the transition very very smooth.

dom

I just put my Injen back on this past weekend. I was getting bored.

With the CAD$ almost at par I might have to order Hondata.

ninjamyst

I feel like at 6k with my 06 MT. Sucks there's only 1k of room to play with before you have to shift again. I want Hondata but too lazy to take out the ecu.

Filet_Show

An aftermarket intake will let you know it's there.

Gilmour

I'm in the same boat as you. I don't want the down time.

I hope in the near future I can buy a Kpro ECU for this car, and add a 45-50 degree vtec to it.

PittIsIt

Amen

supraken

iTrader: (1)

yup, can definitely feel it when it switches to the hi cams on the '06+ TSX's. Whenever I get the '06 loaners and jump back into my '04, that's when it contrasts a lot. I can't feel ANYTHING on my '04.

miken5678

i to had a 98 sh.. the only reason you felt it was because the h22 was a horribly tuned motor.. although it was nice.. any dyno you look at had a huge dip right as vtec engaged.. which gave the impression of a boost as you left the blip.. tuning with a vafc could almost remove it.. like others have said in the ideal situation the vtec switchover shouldnt be felt

khmy2nr

ATsxMan8305

Would VTEC engage while in AT mode? Or will the tranny purposely shift before VTEC? Then the only way would b to use SS mode

synthetic

Yes it does kick in Auto mode.

rb1

Just as a general rule, AT's are usually "programmed" (at least for cars with electronically controlled transmissions) to shift at the redline if you keep the motor at full throttle.

ATsxMan8305

I figured that, but just wanted to make sure. Have 2200 miles and have only hit 5K rpm to this point, plan to VTEC it this week

feelgood13

i think i feel it sometimes but there's no noise associated to it. i have an 06 5at. all those years of watching knight rider did nothing but give me false hopes...

alucardx

06 NBP 5AT here.. i hit VTEC on my way to work because i was thinking of this thread.

2nd gear in SS mode.. going up a fairly long hill. hit that 6000 RPM (was at about 60MPH at that point) and the car went WOOOOOOOOOO. hehe it was fun.