VTEC by MAP and GEAR

[thesilverbullet]

V-TEC settings by gear and map?

MAP along does not work very well for light throttle w/ cai & rh. I want a low vtec setting (3.5-4k) for full throttle and a higher vtec (5k) at part throttle. part throttle power is better on the low cam at lower rpms (part throttle & low rpm accel sounds like shit on the high cams in 3rd/4th). it's hard not to get into vtec (w/ low rpm setting) with only map control because I get a high map (mid-to high 90kpa's) with light trottle in higher gears (3rd & 4th).

[thesilverbullet]

V-TEC settings by gear and map?

MAP along does not work very well for light throttle w/ cai & rh. I want a low vtec setting (3.5-4k) for full throttle and a higher vtec (5k) at part throttle. part throttle power is better on the low cam at lower rpms (part throttle & low rpm accel sounds like shit on the high cams in 3rd/4th). it's hard not to get into vtec (w/ low vtec/rpm setting) with only map control because I get a high map (mid-to high 90kpa's) with light trottle in higher gears (3rd & 4th).

[Razathorn]

Yeah mine wants to be there too. I settled on 3750. It works pretty well. I've found that after a while of trying to not hit the vtec on a daily driving basis when accelerating, I tend to start lifting the pedal at the top of the gears to the point that by the time 3750 rolls around, i'm running less than 90 kpa and my vtec doesn't kick in till later. I generally shift before 3750 too.

Personally I think if you don't like the lower vtec engagement and want to stay on the low cams for longer you could just have a calibration for tracking and one for daily driving. Daily driving, leave it at like 5000 - 6000. Doesn't take long to get to 5000 when you really want to accelerate, and after your first shift, you won't leave that rev range unless you short shift. Then at the track, load one up that engages at 3500 or so... say for a road course.

Personally, I love snapping the throttle at 4k and instantly engaging vtec in first when I have people who haven't been in the car before. Heh... that look on their face is classic when the CAI + race header and 3 inch muffler come to life and the tires spin like crazy. One of these days i'm going to break a drive shaft fucking around .

Wayne

[thesilverbullet]

that what i'm running now - set at 4.5k @ 100kpa and 6k @ 50 but i would love to have more control of the settings - like by gear.

i really like it at 3.5 or so... maybe i'll change it back and like you said layoff between 4-5k in 3rd and 4th or downshift to get the rpm out of that range....

[CivicVTi]

So has any of you guys dyno tested your cars? I can't see how such a low vtec engagement would work without a huge dip in power. 3500rpm is extremely low I think. Correct me if I am wrong.

[racing-honda]

Wrong.
Tuning all cam angles individually high and low with my (Euro)CTR + AEM CAI + Supersprint RH + exhaust showed that the high cams will give you really substantially more power all the way down to maybe even 3500 than the low cams.
Similar NA setups on RSX-es show the same results.

Still I have set VTEC to engage at 4000 (@94kPa) to 5800 (@76kPa).
Just because I don't want the VTEC to engage while cruising on the highway.... I suspect (no proof though) that fuel economy might be less if it goes to the high cams all the time. Honda definitely tuned low cam cruise tables for economy. I doubt very much wether they did with the high cam area.

If you set it lower than 4000 it will become very difficult to do this and VTEC will come in as soon as you even think about touching the throttle.
Hence the request to determine boundaries by TPS instead of MAP.

If you use a relatively high MAP value for the upper VTEC boundary as in my setup it's not too terrible, it still allows a bit of throttle.

[racing-honda]

Wrong.
Tuning all cam angles individually high and low with my (Euro)CTR + AEM CAI + Supersprint RH + exhaust showed that the high cams will give you really substantially more power all the way down to maybe even 3500 than the low cams.
Similar NA setups on RSX-es show the same results.

Still I have set VTEC to engage at 4000 (@94kPa) to 5800 (@76kPa).
Just because I don't want the VTEC to engage while cruising on the highway.... I suspect (no proof though) that fuel economy might be less if it goes to the high cams all the time. Honda definitely tuned low cam cruise tables for economy. I doubt very much wether they did with the high cam area.

If you set it lower than 4000 it will become very difficult to do this and VTEC will come in as soon as you even think about touching the throttle.
Hence the request to determine boundaries by TPS instead of MAP.

If you use a relatively high MAP value for the upper VTEC boundary as in my setup it's not too terrible, it still allows a bit of throttle.

[thesilverbullet]

So has any of you guys dyno tested your cars? I can't see how such a low vtec engagement would work without a huge dip in power. 3500rpm is extremely low I think. Correct me if I am wrong.

no dip at for 1st gear and 2nd gear @ WOT.

now you get a little with 3rd and more with 4th and 5th. but why would you be in higher gears at 3.5k at WOT? if you are in 3rd @3.5k rpm then you should down shift to 2nd for WOT which would put you around 5k rpm.

[thesilverbullet]

Bump!

Is vtec by gear possible? i would love to have a low setting for 1st and 2nd a higher setting for 3rd & 4th. it's doesn't sound good to hit vtec @ ~3-4k in 3rd or 4th at any throttle... MAP wont get the job done with engine is loaded in higher gear...