Diff between VTEC and i-VTEC
03-20-2002 | 05:56 PM
#2
The Acura Granddaddy
Joined: Dec 2000
Posts: 629
Likes: 0
From: Federal Way, WA
The difference is that an i-VTEC motor can change its valve timing in addition to lift and duration. Normal VTEC only changes lift and duration of the valves. Being able to advance and retard timing is vital to extracting even more power out of a motor and keep its daily drivability.
03-20-2002 | 06:36 PM
#4
Cost Drivers!!!!
Joined: Mar 2001
Posts: 19,392
Likes: 1
From: burbs of philly
Originally posted by Styles__69
yeah but the question still remains..
why wouldnt they put that on the CL than?
yeah but the question still remains..
why wouldnt they put that on the CL than?
They will. Every acura engine will have ivtec by 2005. Next gen cl in 2004 should have ivtec. '03 NSX is rumoured to be a ivtec 4.0L v8 or possibly an ivtec 3.5L v6.
03-20-2002 | 06:51 PM
#5
6 Forward 1 Back
Joined: Feb 2001
Posts: 2,400
Likes: 312
From: Bay Area CA
Originally posted by LegendC
The difference is that an i-VTEC motor can change its valve timing in addition to lift and duration. Normal VTEC only changes lift and duration of the valves. Being able to advance and retard timing is vital to extracting even more power out of a motor and keep its daily drivability.
The difference is that an i-VTEC motor can change its valve timing in addition to lift and duration. Normal VTEC only changes lift and duration of the valves. Being able to advance and retard timing is vital to extracting even more power out of a motor and keep its daily drivability.
03-20-2002 | 06:55 PM
#6
Senior Moderator
Joined: Oct 2000
Posts: 7,588
Likes: 48
From: Port Richey, FL
Originally posted by Speed_Racer
I thought I read also that i-VTEC gives you more bottom end torque? Is that true? Is this also one of the reasons that the RSX Type-S has such a quick 0-60 time. . .
I thought I read also that i-VTEC gives you more bottom end torque? Is that true? Is this also one of the reasons that the RSX Type-S has such a quick 0-60 time. . .
the i's have it then...
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03-20-2002 | 07:22 PM
#9
Moderator Alumnus
Joined: Oct 2000
Posts: 16,399
Likes: 8
From: Washington DC (NOVA)
Originally posted by typeR
yep...i vetc makes better torque...i vote the 2004 gets a 3.5 i-VTEC 300 hp/300 lb.ft.??? do i have any nay's?.
the i's have it then...
yep...i vetc makes better torque...i vote the 2004 gets a 3.5 i-VTEC 300 hp/300 lb.ft.??? do i have any nay's?.
the i's have it then...
I am sure you know what I mean.
03-20-2002 | 07:49 PM
#11
Senior Moderator
Joined: Oct 2000
Posts: 7,588
Likes: 48
From: Port Richey, FL
Originally posted by gavriil
I doubt 300 pounds from a 3.5 liter but for sure 265 pounds. Torque is hard to make because it is much dependant on engine displacement. You can make all the power in the world by making it spin faster, but torque will go up marginally.
I am sure you know what I mean.
I doubt 300 pounds from a 3.5 liter but for sure 265 pounds. Torque is hard to make because it is much dependant on engine displacement. You can make all the power in the world by making it spin faster, but torque will go up marginally.
I am sure you know what I mean.
03-20-2002 | 08:01 PM
#12
Suzuka Master
Joined: Nov 2000
Posts: 7,388
Likes: 1
From: Ninth Gate & So Cal
They remove VTEC too....
Originally posted by 23wt
I heard that the new i-vtec is not that great for modding and if i-vtec is compared with vtec, vtec is better.
I heard that the new i-vtec is not that great for modding and if i-vtec is compared with vtec, vtec is better.
A lot of the "race" folks remove the I-VTEC and the tighter the gearing (gear ratios), the less need there is for it.
In "everyday" situations, where emissions are very important, it is very helpful to keep the torque up, while allowing the overlap and duration of the cams to be used to gain torque (and power) and to control "quenching" and exhaust dilution that can help with N0x control.
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