VVT-i vs. VTEC

[VibeN5]

I was wondering what the differences are between the VVT-i and VTEC variable valve timing sytems. The wife drives a '98 Honda Prelude. When it hits VTEC at about 5400 rpms, you definitely feel a turbo-like power surge. My Vibe is a base model with the 4-speed auto. When I push her, I don't feel that VTEC-like surge. Is that the difference between the 2 systems or do I need to push the Vibe harder in order to feel the VVT-i kick in?

[ajflan]

There is nothing really to feel in the base 1zz engine. The 2zz in the GT is the one that has lift, and that has a "surge" like quality to it. With the base vvt-i engine, when you really get on it all it does is make more noise.

[Ninja_Logan]

And VVTL-I is better than vtec! VVTL_I FTW! V_TEC FTL!

[VibeN5]

Wow, that's pretty disappointing. I thought I had read something where the VVT-i did have lift on the intake side. So, it's only on the 2ZZ not the 1ZZ?

[GrayFox]

1zz-fe = VVT-I2zz-ge = VVTL-IYour wife's prelude is more equivalent to a Vibe GT as far as horsepower goes...and yeah, no lift on the 1zz

[ajflan]

It may not have lift, but I still find it very enjoyable to drive.

[kevera]

Plus a VTEC will kick a 1zz's (removed).

[Vibe_dude]

here is a link hope this helps.http://www.toyota.com.au/toyot...x.htmh ... ot...x.htm cool vid here of it.

[Celtic_Curse]

Ummm no it won't. Beat my share of VTEC Preludes. Comparing Vtec to VVt-i is like comparing apples to oranges...both are good systems but are tuned for different things. I think VTEC originally is equivalent to our VVT-i which was Toyota's responce to it. i-VTEC is the VVTL-i eqivalent with DOHC introduced in Honda k-series engines in 2002. I'll use this quote from another forum to explain more."The difference between VVT-i and VTEC: VTEC "kicks in" at higher rpm levels to improve performance. This does not offer continuous variable valve timing.Instead of the on/off system that VTEC uses, VVTi offers continuous variable system that maximizes valve timing throughout the rpm range.Does this mean honda's vtec is not intelligent? The new accords finally upgarde from their older SOHCs to DOHCs, and along with that came iVTEC. Oh but guess what, Toyota already has that covered too with their VVTL-i with is still more superior."Hope that helps. Feel free to correct me if I am wrong, again it is comparing an apple to an orange both are very good systems.

[Ninja_Logan]

VVTL-I = better!!! woohoo! + 1 for beers!!!

[mistertwo]

ahahahaha.... did you really just compare v-tec to a turbo... lol... obviously you have never driven a turbo car hahaha.. d00000000000d don't race honduhs... they have vtak and are maddd fast y0LOL

[northvibe]

the new 1zz replacement (forgot the new model name) has dual vvti !! that should be sweet...makes more hp/torq. if yota isnt so tight on the ecu, there could be some crazy sweet tuning abilities!

[Celtic_Curse]

Quote, originally posted by mistertwo »ahahahaha.... did you really just compare v-tec to a turbo... lol... obviously you have never driven a turbo car hahaha.. d00000000000d don't race honduhs... they have vtak and are maddd fast y0LOLHuh?

[Daox]

This is why I dislike using forums as a Bible for information. You all have semi-correct points, but not totally right. I'm not going to go over each type and how they work. You can go to the link below and it explains Honda's, Toyota's and other's cam timing/lift systems. Suffice to say VTEC is superior to VVT-I as far as performance goes. I-VTEC is definitly superior to both VVT-I and VVTL-I.Go hear to read about them: http://www.autozine.org/techni....html

[mistertwo]

he compared vtec to a turbo... i have driven a turbo supraa turbo beetle and a turbo t/a and a vtec civicand reading that just cracks me up lol.. there is no comparison..

[98ex]

Quote, originally posted by Daox »This is why I dislike using forums as a Bible for information. You all have semi-correct points, but not totally right. I'm not going to go over each type and how they work. You can go to the link below and it explains Honda's, Toyota's and other's cam timing/lift systems. Suffice to say VTEC is superior to VVT-I as far as performance goes. I-VTEC is definitly superior to both VVT-I and VVTL-I.Go hear to read about them: http://www.autozine.org/techni....htmlThank you, you saved me the trouble in posting this.I have driven a SOHC VTEC engine, A DOHC VTEC engine, A SOHC iVTEC engine, and now my Trix with the VVTi. I have also driven a VVTLi engine in a camery, and I can tell you that VTEC is superior in all aspects. In SOHC form, VTEC was only affected the intake side of the process, so it helped but not to the full extent that DOHC VTEC could. DOHC VTEC would affect botht he intatke and exhaust cams so you had much more aggressive capabilities in regards to tuning. Also what was wonderful about the old VTEC (from 02 - 01 on various models) was with some engine management addons, like the Apex VAFC or the Hondata system, you could actually control when the switchover happened. Now in regars to the VVTL-i it is a good system, but you have to understand that Honda has been working with Variable Timing for MUCH longer than Toyota has, and has patents on certain designs which limits what other manurfacters can do.With my Old 98 Civic EX here was my setup in my old civic, and it was a BIG difference going from SOHC to DOHCBought stock - within 2 years added- DC 4-2-1 headers, AEM CAI, Skunk2 Coilovers with KYB AGX shocks, Venom ECU control module(allowed me to overide stock fuel maps) 50 dry shot nitrous. As you can tell, this was not enough for me. So, onto building the beast.In February of 2000, began my engine swap. (The only reason I had an LS tranny was that the GSR tranny blew and needed to find something fast. Ended up liking the LS tranny better as it provided MUCH better gas milage for highway driving and didn't sacrifice a lot during street racing. I could hang in certain gears longer than other GSR's but I had slower starts)2000 B18C1 (GSR motor) 1999 LS transmission(higher gear ratios),DC 4-1 headers, AEM CAI, Random Tech High Flow Cat, NEX coilovers, N1 Dunk Catback Exhaust with Custom 2.75" Piping and an ACT Extreme preasure plate with 4 puck disc(harsh, but it held up to a years worth of 6K rpm drops). Before I started pulling the engine apart to modify, I hit 155 on 635 near the Tollway with this setup racing a Turbo VW (only reason I lost is because my setup would not produce anymore power, and I was only at 5K RPM on an 8200RPM redline) At this time I was only puting down 190whp.After I cracked open the engine, I put in Skunk2 Cams with gears, titanium valve springs/retainers, Endyn Rollerwave 12:1 pistons w/ rods, bore from 1.8L to 2.0L with resleeve and P&P on the head and intake manifold. That yeilded 245 whp with 215lb tq. I then proceeded to the demise of that set of Rods and pistons by adding a GSR Plate Kit with a 100 shot. With the kit on, I could not keep the wheels from breaking loose through 3rd. Then I had to buy new axles since I snapped them at the track. Best time was 13.2 in the 1/4 before they banned me from the track for not having proper safety equipment (no roll cage) This was my daily driver. All mods came in 2000 and I drove that setup until 02 when I sold the car. Bought the car brand new for 17K (was a graduation present really) from early 2000 until late 2000 put close to 12K in mods into it. Engine had about 40Kmiles on it when I sold it, body had 125K miles. Sold car in late 02 (after LOTS of abuse from me) for $9,800 to a local kid who in turn promptly wrecked it within a week doing 90 in a 40. I cryed when I heard, that was my baby for so long.

[stewpid]

ive work on both and VVT1 engine just rotates the cam for gas milage and vtech accutally changes the cam lobes at the set revs if im not mistaken

[98ex]

Quote, originally posted by stewpid »ive work on both and VVT1 engine just rotates the cam for gas milage and vtech accutally changes the cam lobes at the set revs if im not mistaken It is based on Oil preasure for VTEC (on the old VTEC) so if you were low on oil, or used synthetic, you could have a problem. With my GSR, I had to run 20w50 to get VTEC to work proparly(also cause I needed a better oil since my car ran hot, the oil viscosity would not be enough with 5w30 and definately not enough with Synthetic.