Vtec and VVTl-i are the same thing correct or are they closely related.
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From: DETROIT DA DIRTY D, MI, US
Vtec and VVTl-i are the same thing correct or are they closely related.
They do the same thing correct. Because my boys celica pulls hard at about 6200 rpms and does a vtec controller serve its same purpose on a honda acura as it would on a celica. 
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (kaoss_11)
VVTI works by using oil pressure to actually move the cam gears to change the timing. Not entirely sure about VVTi-L, L is probably more like VTEC.
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (FourthGenHatch)
I'm not 100% up on the Toyota variable valve system, but the "L" in the VVTi-L is for "Lift"
The standard VVTi just messes with cam timing.
I'm not sure a vtec controller is compatible with the Toyota system, that may be a question for APEXi.
The standard VVTi just messes with cam timing.
I'm not sure a vtec controller is compatible with the Toyota system, that may be a question for APEXi.
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (kaoss_11)
I believe VVTl-i is equivilent to Honda's iVTEC.....
the "i" pertains to 'intelligent' as in the ecu controls the cam timing and self-adjusts when there's a need to for more low-end or top-end power.
the "i" pertains to 'intelligent' as in the ecu controls the cam timing and self-adjusts when there's a need to for more low-end or top-end power.
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From: The Hudson
Re: Vtec and VVTl-i are the same thing correct or are they closely related. (Katman)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Katman »</TD></TR><TR><TD CLASS="quote">I believe VVTl-i is equivilent to Honda's iVTEC.....
the "i" pertains to 'intelligent' as in the ecu controls the cam timing and self-adjusts when there's a need to for more low-end or top-end power.</TD></TR></TABLE>
The VVTi is continuously variable though, where as VTEC is set to ingage during certain conditions. VTEC is a much simpler system than VVTi because of this. VVTi is more along the lines of a VANOS system from BMW because it's continously variable.
the "i" pertains to 'intelligent' as in the ecu controls the cam timing and self-adjusts when there's a need to for more low-end or top-end power.</TD></TR></TABLE>
The VVTi is continuously variable though, where as VTEC is set to ingage during certain conditions. VTEC is a much simpler system than VVTi because of this. VVTi is more along the lines of a VANOS system from BMW because it's continously variable.
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (EX_AutoXer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EX_AutoXer »</TD></TR><TR><TD CLASS="quote">
The VVTi is continuously variable though, where as VTEC is set to ingage during certain conditions. VTEC is a much simpler system than VVTi because of this. VVTi is more along the lines of a VANOS system from BMW because it's continously variable.
</TD></TR></TABLE>
..agreed, but I believe that this 'continous variable system' is similar to what the newer version of VTEC now has found on the K-series 'iVTEC' engines. The older version of VTEC (b-series) obviously do not have this continous variable system.
The VVTi is continuously variable though, where as VTEC is set to ingage during certain conditions. VTEC is a much simpler system than VVTi because of this. VVTi is more along the lines of a VANOS system from BMW because it's continously variable.
</TD></TR></TABLE>
..agreed, but I believe that this 'continous variable system' is similar to what the newer version of VTEC now has found on the K-series 'iVTEC' engines. The older version of VTEC (b-series) obviously do not have this continous variable system.
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (EX_AutoXer)
The "i" in the iVTEC refers to the VTC or Variable Timing. The Intake cam has this only, as does any valve manipulation. The exhaust cam is fixed.
The <U>standard</U> iVTEC in the new K motors is just like the VTEC-E of old, but with VCT. The iVTEC in the Type S is just like the B series VTEC, but with VTC also.
The VTC is seperate from the VTEC mechanism.
I believe the VANOS system can continuousley change the actual lift and duration on the fly from what I've read about it.
Modified by Buzzbomb at 7:38 AM 6/18/2004
The <U>standard</U> iVTEC in the new K motors is just like the VTEC-E of old, but with VCT. The iVTEC in the Type S is just like the B series VTEC, but with VTC also.
The VTC is seperate from the VTEC mechanism.
I believe the VANOS system can continuousley change the actual lift and duration on the fly from what I've read about it.
Modified by Buzzbomb at 7:38 AM 6/18/2004
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (EX_AutoXer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EX_AutoXer »</TD></TR><TR><TD CLASS="quote">
The VVTi is continuously variable though, where as VTEC is set to ingage during certain conditions. VTEC is a much simpler system than VVTi because of this. VVTi is more along the lines of a VANOS system from BMW because it's continously variable.
</TD></TR></TABLE>
I don't think the VVTi has any valve manipulation at all, I think it's all just cam timing. It would be like a Honda motor with just VTC and no VTEC
Modified by Buzzbomb at 9:40 AM 6/18/2004
The VVTi is continuously variable though, where as VTEC is set to ingage during certain conditions. VTEC is a much simpler system than VVTi because of this. VVTi is more along the lines of a VANOS system from BMW because it's continously variable.
</TD></TR></TABLE>
I don't think the VVTi has any valve manipulation at all, I think it's all just cam timing. It would be like a Honda motor with just VTC and no VTEC
Modified by Buzzbomb at 9:40 AM 6/18/2004
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From: Argyle, Tx
Re: Vtec and VVTl-i are the same thing correct or are they closely related. (Buzzbomb)
The vvtl i which comes in the celica gts, is the excact same as the i-vtec in the rsx-s, both having lift and variable intake cam control. The i-vtec in the rsx base model and 03 civic si dont have lift they just have the variable intake. And the vvti is the motor that comes in the base celica which only has the variable intake. So none of the motors are the same as the standard vtec (b18c,b16a) to answer your question...
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Re: Vtec and VVTl-i are the same thing correct or are they closely related. (silver00teg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silver00teg »</TD></TR><TR><TD CLASS="quote">
The i-vtec in the rsx base model and 03 civic si dont have lift they just have the variable intake. And the vvti is the motor that comes in the base celica which only has the variable intake. So none of the motors are the same as the standard vtec (b18c,b16a) to answer your question...</TD></TR></TABLE>
This is totally incorrect. Here's some info from an article from Sport Compact Car.
Perhaps most significantly, the K20A2 employs a more sophisticated i-VTEC system in conjunction with more aggressive cams. There's a lot of confusion of the differences between the two engines' i-VTEC systems, so here's the straight poop. On both cars, i-VTEC really consists of two features: VTC (Variable valve Timing Control) and VTEC (Valve Timing and lift Electronically Controlled). VTC, in both cases, is simply a hydraulically controlled adjustable cam sprocket that varies intake cam timing on the fly depending on engine speed and load. VTC does not affect the exhaust cam. It's the VTEC portion of these systems that differs. On the K20A2 (RSX Type-S), VTEC means there's a low-rpm set of cam lobes and a screaming, high-lift, long duration high-rpm set of cam lobes both carved into the same camshaft. At about 6000 rpm, the rocker arms stop following the wussy little low-rpm cams, and start following the big ones. This is the system that made VTEC synonymous with high-output, 8000-rpm monsters.
Unfortunately, the K20A3 (Civic Si) uses a completely different system that happens to share the VTEC name. At low engine speeds, the two intake valves operate with different cam lobes--one valve gets the "primary" lobe (33.925mm lobe height). The other valve gets a wimpier "secondary" lobe (29.638mm lobe height). When VTEC mode kicks in at 2300 rpm, both valves start following the primary lobe. That's it. No high-rpm kick, no screaming, no high output. In the meantime, the exhaust valves always get shoved open by a 34.092mm lobe with no tricks at all. (sounds like the VTEC-E, doesn't it?)
So like my post above, the standard i-VTEC is like the VTEC-E of old but with VTC and the Type-S i-VTEC is like the B-Series VTEC, but with VTC.
Of course, I'm excluding the variable intake of the GSR because that really is a seperate deal altogether.
The i-vtec in the rsx base model and 03 civic si dont have lift they just have the variable intake. And the vvti is the motor that comes in the base celica which only has the variable intake. So none of the motors are the same as the standard vtec (b18c,b16a) to answer your question...</TD></TR></TABLE>
This is totally incorrect. Here's some info from an article from Sport Compact Car.
Perhaps most significantly, the K20A2 employs a more sophisticated i-VTEC system in conjunction with more aggressive cams. There's a lot of confusion of the differences between the two engines' i-VTEC systems, so here's the straight poop. On both cars, i-VTEC really consists of two features: VTC (Variable valve Timing Control) and VTEC (Valve Timing and lift Electronically Controlled). VTC, in both cases, is simply a hydraulically controlled adjustable cam sprocket that varies intake cam timing on the fly depending on engine speed and load. VTC does not affect the exhaust cam. It's the VTEC portion of these systems that differs. On the K20A2 (RSX Type-S), VTEC means there's a low-rpm set of cam lobes and a screaming, high-lift, long duration high-rpm set of cam lobes both carved into the same camshaft. At about 6000 rpm, the rocker arms stop following the wussy little low-rpm cams, and start following the big ones. This is the system that made VTEC synonymous with high-output, 8000-rpm monsters.
Unfortunately, the K20A3 (Civic Si) uses a completely different system that happens to share the VTEC name. At low engine speeds, the two intake valves operate with different cam lobes--one valve gets the "primary" lobe (33.925mm lobe height). The other valve gets a wimpier "secondary" lobe (29.638mm lobe height). When VTEC mode kicks in at 2300 rpm, both valves start following the primary lobe. That's it. No high-rpm kick, no screaming, no high output. In the meantime, the exhaust valves always get shoved open by a 34.092mm lobe with no tricks at all. (sounds like the VTEC-E, doesn't it?)
So like my post above, the standard i-VTEC is like the VTEC-E of old but with VTC and the Type-S i-VTEC is like the B-Series VTEC, but with VTC.
Of course, I'm excluding the variable intake of the GSR because that really is a seperate deal altogether.
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From: The Hudson
Re: Vtec and VVTl-i are the same thing correct or are they closely related. (Buzzbomb)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Buzzbomb »</TD></TR><TR><TD CLASS="quote">
I don't think the VVTi has any valve manipulation at all, I think it's all just cam timing. It would be like a Honda motor with just CVT and no VTEC</TD></TR></TABLE>
Yeah, I think you're right on that one. It's been a while since I looked into Toyota's system (probably when it first started popping up in a bunch of new models) and must have confused it with VTEC a little bit since then.
I don't think the VVTi has any valve manipulation at all, I think it's all just cam timing. It would be like a Honda motor with just CVT and no VTEC</TD></TR></TABLE>
Yeah, I think you're right on that one. It's been a while since I looked into Toyota's system (probably when it first started popping up in a bunch of new models) and must have confused it with VTEC a little bit since then.
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