Author Topic: V-Tec Query  (Read 2342 times)

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Offline Moirai

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V-Tec Query
on: May 02, 2019, 01:54:11 PM
Hi, guys. New forum member here. And new VFR owner too!

I have a question for you knowledgeable chaps.

I bought a very low mileage Crossrunner just over a month ago (392 miles, previously owned by Honda UK). First service took place at 604 miles and up to that point I didn't take her over about 5,500 rpm, although I just rode her normally with no heavy throttle work.

Since then, I've clocked up around 450 miles, although, never had any reason to take her above 6k rpm. This morning, on my way to work I decided to let her run up a bit higher, and see what the V-Tec gubbins was all about, after reading quite a bit on the performance kick it generates. So I hit the M1 for one junction and let her wind up to around 8k rpm....

And that's where my question comes in, because, not only did I not notice any boost at all, but I noticed that accelerating from around 7k rpm felt like she was more resisting than getting going.

Bottom line; I could not feel any real appreciable difference at all above 6.5k rpm, which leaves me feeling rather confused, concerned and a bit disappointed. Yep, the exhaust note became a bit more impressive, but apart from that, not much.

What should I really be expecting here, guys?

It seems a bit odd that, after all that I've read and tests rides I watched, I cannot detect any V-Tec boost or kick that everyone raves about...

Did someone forget to put the additional valves in or something...?  :002:

Appreciate any insight here.

Cheers,

Mark

Online Lars

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Re: V-Tec Query
Reply #1 on: May 02, 2019, 03:21:45 PM
Hello Mark,

there is no "Vtec kick" - what you can expect is a linear power distribution, meaning when you exceed the 6.5k line vtech is enabled and the engine just keeps pulling and pulling and pulling up into the red zone. Also it depends on which gear you are in. Vtec transition in 6th gear is barely noticeable, however it feels pretty strong in 2nd and 3rd gear. I actually tried that today and the front wheel came up, ( hint set traction control to 1 bar or it will kick in every time you are having a bit of fun )
Another factor that adds in is the relatively soft suspension and generally smooth engine. I had a problem with that in the beginning as I could not feel how fast I was actually going. I did not realize how fast the bike actually accelerates in reality until I checked the speed. I was suddenly "cruising" along at almost 100mph which felt like 30 on my previous bike.

greetings from Germany

Lars

Offline Si Click

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Re: V-Tec Query
Reply #2 on: May 02, 2019, 04:55:33 PM
I am assuming you have a very recent version of the CR in which case the engine has indeed been tuned for a linear power delivery.  OTOH the VTEC transition is very noticeable on my Mk1 and feels as if a turbo has just cut in.  :062: I suspect that what you have read mostly relates to earlier models.
Best Regards Dave
2012 Honda Crossrunner
1955 Triumph TR2
1999 Land Rover Discovery 2 TD5 ES

Offline Skids

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Re: V-Tec Query
Reply #3 on: May 02, 2019, 06:11:10 PM
*Originally Posted by Si Click [+]
I am assuming you have a very recent version of the CR in which case the engine has indeed been tuned for a linear power delivery.  OTOH the VTEC transition is very noticeable on my Mk1 and feels as if a turbo has just cut in.  :062: I suspect that what you have read mostly relates to earlier models.

What Dave says.  :152:

You should still feel the Vtec switch though, even on the 2015+ models (with LED headlights). Try riding in 2nd or 3rd at about 5k rpm then open her up to 8k+. You should feel an appreciable difference in noise and acceleration as you transition through 6.5k. Once above it though, it's all Vtec 4-valve so you will only appreciate the continuing pull, not the difference between 2 and 4 valves.

The transition is not as harsh as the original model Crossrunner (with the standard headlights) or the VFR800 02-13 model as they both share the same engine, but it is still there.

Perhaps you need to exercise the Vtec a little more often!  :016: :031:
98 VFR800 - 130,000 miles (sold)
08 VFR800 - 76,000 miles (sold)
14 VFR1200 - 20,000 miles
15 VFR800X - 44,000 miles (sold)
18 VFR800X - 9,000 miles

Offline Moirai

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Re: V-Tec Query
Reply #4 on: May 02, 2019, 07:23:26 PM
Thanks for the replies, guys. Appreciate you taking the time to educate me.  :002:

Yes, it's a late model (registered Jan this year), so from what you've all said I'm not going to see any sudden surge in performance when the VTec activates.

That's fine though, and arguably preferable for me. I was just concerned that there was something not quite right. But you've put my mind at rest. Thanks!  :046:

Weather permitting, I'll certainly give the 5k-8k in 3rd a go tomorrow morning, Skids. And I'll take the traction control down from two bars to one. Thanks for the tip, Lars!

Oddly enough, I had my first experience of the traction control kicking in on the way home from work earlier. It had been raining but had stopped by the time I left work. Pulling away from one set of lights the engine sounded like it coughed a couple of times and the traction control indicator flashed in time with it. Caught me out for a moment.  :033:

Now that she has a reasonable amount of initial miles on her, I probably will give the VTec a bit more exercise. I'm still getting myself back into a higher revving mindset at present though. Although I've had a number on Ninjas in the distant past, I've been riding a 2004 R1200GS for the last 12 years, and given the tractor-like torque of that engine I've tended to ignore anything above 5k rpm for a very long time.


Cheers, guys.  :002:

Offline Skids

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Re: V-Tec Query
Reply #5 on: May 02, 2019, 08:04:15 PM
*Originally Posted by Moirai [+]
Thanks for the replies, guys. Appreciate you taking the time to educate me.  :002:

Weather permitting, I'll certainly give the 5k-8k in 3rd a go tomorrow morning, Skids.


Just make sure yr in a quiet area....it'll get you to some decent speeds.  :005: :164:

I guess you could always try it in 2nd.
98 VFR800 - 130,000 miles (sold)
08 VFR800 - 76,000 miles (sold)
14 VFR1200 - 20,000 miles
15 VFR800X - 44,000 miles (sold)
18 VFR800X - 9,000 miles

Offline CBM

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Re: V-Tec Query
Reply #6 on: May 03, 2019, 07:48:44 AM
It sounds as though you've not got enough miles on her to "test" it properly yet. Once you have just get her rolling, pin the throttle, and you'll feel and hear the V-Tec kick in. The differance in power also makes the front wheel start to just skim the road, hook 2nd and she'll do it again. They run out of puff a bit compared to other 800/900's but the "Dresser" can be fun when required  :152:

Report summary - Must try harder  :001: :400:

Offline Haddo

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Re: V-Tec Query
Reply #7 on: May 03, 2019, 12:57:17 PM
My 16 didn't really start to free up until about 10,000kms, but I run my bikes in by the book. After that I really noticed and now use the extra power delivery when all valves open. Some have said 6500rpm but I would say more like 5500. But my bike is Jap/Aus not Euro so there may be a diff. in tuning?

Offline Skids

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Re: V-Tec Query
Reply #8 on: May 03, 2019, 01:20:31 PM
*Originally Posted by Haddo [+]
My 16 didn't really start to free up until about 10,000kms, but I run my bikes in by the book. After that I really noticed and now use the extra power delivery when all valves open. Some have said 6500rpm but I would say more like 5500. But my bike is Jap/Aus not Euro so there may be a diff. in tuning?

02-06 Vtec engines had the changeover from 2 to 4 valves at 6800rpm which led to hunting issues when riders rode consistently in that rpm range as the system was constantly engaging and disengaging. On the 06+ models, Honda changed to 6800rpm 2-to-4 valves but lowered the 4-to-2 valves to 6400rpm, thus alleviating the issue. The engine stayed the same through to the model change in 2014. The 2011-2015 Crossrunner had the same engine. In nearly 20 years of riding the VFR800, I've never seen any evidence to suggest there are different tuning levels in other countries.

The new VFR800F came out in 2014, with the revised engine incorporated into the 2015+ model VFR800X Crossrunner. I haven't seen any specific figures from Honda regarding this engine but struggle to imagine they would lower the engagement so much. This is backed up by my own anecdotal evidence from my 2015 Crossrunner where the Vtec definitely engages at around 6800rpm, which equates to approx. 96mph in 6th gear.
98 VFR800 - 130,000 miles (sold)
08 VFR800 - 76,000 miles (sold)
14 VFR1200 - 20,000 miles
15 VFR800X - 44,000 miles (sold)
18 VFR800X - 9,000 miles

Offline Haddo

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Re: V-Tec Query
Reply #9 on: May 03, 2019, 10:09:21 PM
There must be some difference then. My 16 cuts in well before 155kph/ 96mph.
6th.  :027:
Edit: Thats on the gas, if I idle up to those speed it seems to re-map itself and not cut in at all.?
Last Edit: May 03, 2019, 10:33:31 PM by Haddo