VVTI
- Thread starter 87soup
- Start date
V-tech's a whole 'nother lobe on the cam, a different profile for high rpms ... so not really comparible to simply varying the timing on the same cam lobe.
VVTi is good if the motor is stock with say, intake/exhaust.
Use it with a turbo, and you'll start breaking shit.
Weaker rods and even if you replaced them, the VVTi WILL hold you back if you go turbo/mid-high boost.
Use it with a turbo, and you'll start breaking shit.
Weaker rods and even if you replaced them, the VVTi WILL hold you back if you go turbo/mid-high boost.
suprastanger507mgte said:
Dont talk bad about my Scion.:slap: You dont wanna get owned again do you? :biglaugh:
RacerXJ220 said:
The VVT-i 1JZ's over here in Japan are pretty sweet. If you can get your hands on one of those I'd get it. You'd also be suprised at how many high horsepower VVT-i engines you'd see over here. That's the prefered, 2JZ aside, Toyota engine to mod over here. Also for those not in the know, VTEC stands for "Variable Valve Timing with Lift & Electronic Control", obviously Toyota's "Variable Valve Timing w/ Intelligence" is not much different in terms of basic design and function. One cam for low RPM street drving and another for high RPM use to help with gas consumption and power delivery.
When you say high horsepower, elaborate. Under 400RWHP isn't "high" to me. And I'd love to see a 1JZ with VVTi make more than that, dont' get me wrong, I'm serious. I would think the VVT-i would be restrictive, as it is in the 2JZ with it. More information would be great to know.
^^^ lol nice avatar from the movie the family learning channels "rejected.wmf" rejected cartoons
VVT-I is basicaly what an adjustable cam does Exception is it does this while the engine is running!
It does this primarly for beter fuel savings with minor enhancments on power
The problem is the ECU is a lot more complicated a lot more sensors and haves infinit tunning!
on a side note i have the best toyota engine ever made and it is also the only one with DUEL VVTI called the BEAMS 3SGE 2.0ltr motor 4th gen motor makes 220 hp out of a N/A motor and tunes well above 275 at the wheels as seen by the fraser car in australia this is NA power might i remind you he acomplished this with stand alone ecu and side drafts with turbo like the HKS altezza and the ultimate altezza they can produce 5-800+hp
Tunning VVTI is verry expensive and after tunning your engine 2-3X more power then factory it gets in the way! so most power tuners disable it and place stationary or manuely tunned sprockets on the cams. Also who wants a 500hp engine that gets 40 miles to the gallon wont happen.
If you decide to leave your supra factory ecu and factory twin turbo then yes vvti is worth it
But if you plan to tune your supra stay way away from it dont even think about it unless your a super rich tech shop with millions in sponsers like HKS rodmillen Toms
VVT-I is basicaly what an adjustable cam does Exception is it does this while the engine is running!
It does this primarly for beter fuel savings with minor enhancments on power
The problem is the ECU is a lot more complicated a lot more sensors and haves infinit tunning!
on a side note i have the best toyota engine ever made and it is also the only one with DUEL VVTI called the BEAMS 3SGE 2.0ltr motor 4th gen motor makes 220 hp out of a N/A motor and tunes well above 275 at the wheels as seen by the fraser car in australia this is NA power might i remind you he acomplished this with stand alone ecu and side drafts with turbo like the HKS altezza and the ultimate altezza they can produce 5-800+hp
Tunning VVTI is verry expensive and after tunning your engine 2-3X more power then factory it gets in the way! so most power tuners disable it and place stationary or manuely tunned sprockets on the cams. Also who wants a 500hp engine that gets 40 miles to the gallon wont happen.
If you decide to leave your supra factory ecu and factory twin turbo then yes vvti is worth it
But if you plan to tune your supra stay way away from it dont even think about it unless your a super rich tech shop with millions in sponsers like HKS rodmillen Toms
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Here’s some food for thought.....
Do you really think Toyota would go backwards with there 1j or 2j motors. The VVTI is all of that and more those who say different really don’t know.
Some facts
The usa is just coming around and starting to accept the vvti as it was just like the 1j where people didn’t have much experience with it so it was looked down on. Now look
Tuning is awesome just think about your PC in the early 1990's compared to the later 90s now apply that to the Toyota ecu
hks even sells cams for it
and i have herd the rumors/myth of weaker internals prove it.
Thanks for listening
Do you really think Toyota would go backwards with there 1j or 2j motors. The VVTI is all of that and more those who say different really don’t know.
Some facts
The usa is just coming around and starting to accept the vvti as it was just like the 1j where people didn’t have much experience with it so it was looked down on. Now look
Tuning is awesome just think about your PC in the early 1990's compared to the later 90s now apply that to the Toyota ecu
hks even sells cams for it
and i have herd the rumors/myth of weaker internals prove it.
Thanks for listening
nope internals are just as strong the beams engine is built all titanium and forged
VVTI and metal component strength are diffrent
VVTI is superior technology infact they should have it on both cams but it haves infinit variables and is way more complex and cost 4-5 times more to tune the engine with it enabled so if you leave the engine stock then go vvti otherwise if you plan to tune 400+ hp and go single turbo upgrade then stay away from it.
VVTI is "intelegent" tunning of the cam most stand alones have issues with it running and cant manage it it is verry hard to duplicate what toyota invested into these and when you change other variables in the mix like compression boost lengths temperatures it screws things up.
VVTI and metal component strength are diffrent
VVTI is superior technology infact they should have it on both cams but it haves infinit variables and is way more complex and cost 4-5 times more to tune the engine with it enabled so if you leave the engine stock then go vvti otherwise if you plan to tune 400+ hp and go single turbo upgrade then stay away from it.
VVTI is "intelegent" tunning of the cam most stand alones have issues with it running and cant manage it it is verry hard to duplicate what toyota invested into these and when you change other variables in the mix like compression boost lengths temperatures it screws things up.
Toyota did take a step back IMO just from the internals stand point.
Take the IS300 for example, it has VVTi, it's still a 2JZ, WEAK internals.
Take the SC300 which does not have VVTi, 2JZ, stock rods/pistons up to 700RWHP.
I would take the SC300's 2JZ anyday of the week over the IS300. The IS300 would probably break a rod after 400RWHP. Pieces of shit IMO. The motors that it comes on just plain suck ass when it comes to putting the power down. Their internals ARE weaker guys.
Take the IS300 for example, it has VVTi, it's still a 2JZ, WEAK internals.
Take the SC300 which does not have VVTi, 2JZ, stock rods/pistons up to 700RWHP.
I would take the SC300's 2JZ anyday of the week over the IS300. The IS300 would probably break a rod after 400RWHP. Pieces of shit IMO. The motors that it comes on just plain suck ass when it comes to putting the power down. Their internals ARE weaker guys.
Im sorry, i was asuming you ment the turbo charged version. I wouldnt boost a motor that wasnt ment for boost in the first place.
Would you swap a VVTI engine into a MKIII?
Suppose I added stand alone?
How much horsepower would this be able to put down on stock internals?
faced with putting this motor in as compared to a built 7m? I am thinking the 7m is a better choice?
Give me some opinions its a lot of money if I screw up!!!
Suppose I added stand alone?
How much horsepower would this be able to put down on stock internals?
faced with putting this motor in as compared to a built 7m? I am thinking the 7m is a better choice?
Give me some opinions its a lot of money if I screw up!!!
vvti engine is better then 7m stock vs stock better milage better reliability if you leave them pretty much stock.
The torque peak is the most effecient operating point in the power curve. It only has one point because the cam is only one point. The manifolds, head and timing are layed out to maximize this one point for all drivers.
VVTi eliminates that restriction. The cam can be varied to fit any need. But yet, you need tuning to dial it in. Whoever said it was a restriction should stop posting about it until you know something about it. And yes, it is the same basic thing as Honda. Not all Honda V-tec equiped motors have variable lift and timing, some are just variable timing. The same as Toyota, which has VVTi and VVTi-L for variable lift.
It is a much better way. For one thing, it eliminates the need for an EGR valve, because you can purge the cylinder at idle, lowering NOx. You could do it with a great big lumpy cam, but then you have HC's spitting out the exhaust.
Finding a way to retrofit VVTi and controll it would be one of the best things you could do to your car. And the IS300 dropping engine weight to get higher fuel mileage has nothing to do with the merits of VVTi.
VVTi eliminates that restriction. The cam can be varied to fit any need. But yet, you need tuning to dial it in. Whoever said it was a restriction should stop posting about it until you know something about it. And yes, it is the same basic thing as Honda. Not all Honda V-tec equiped motors have variable lift and timing, some are just variable timing. The same as Toyota, which has VVTi and VVTi-L for variable lift.
It is a much better way. For one thing, it eliminates the need for an EGR valve, because you can purge the cylinder at idle, lowering NOx. You could do it with a great big lumpy cam, but then you have HC's spitting out the exhaust.
Finding a way to retrofit VVTi and controll it would be one of the best things you could do to your car. And the IS300 dropping engine weight to get higher fuel mileage has nothing to do with the merits of VVTi.
