Common "weak" VTEC causes
01-08-2015, 02:14 AM
#11
Registered User
Whilst the cam profile is boolean, the ignition timing and fuelling isn't.
Winding back the ignition timing will cost you power and 'soften' the VTEC transition.
Throttle position, intake air temp, knock sensor all play on what the ECU will give you.
If you look at when Daytona dave did his oil comparison dyno runs, you'll see it happening.
01-08-2015, 02:16 AM
#12
UK Moderator
Originally Posted by jimmyb1978' timestamp='1420709249' post='23460449
Low Oil level will stop in engaging
And buying a later version will have a softer transition (from what I've read)
And buying a later version will have a softer transition (from what I've read)
If you want a more aggressive changeover, you'd probably be best off buying an older car!
Next meet local to you will be the next Herts meet on 5th February. The last meet thread is here, but I suspect a new one for February will appear soon. https://www.s2ki.com/...y-4th-december/
01-08-2015, 02:33 AM
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Originally Posted by Dembo' timestamp='1420714599' post='23460500
VTEC moves the cams so that more aggressive valve timing is used. There's only two positions; it can't be weak. It's either working or it isn't.
Whilst the cam profile is boolean, the ignition timing and fuelling isn't.
Winding back the ignition timing will cost you power and 'soften' the VTEC transition.
Throttle position, intake air temp, knock sensor all play on what the ECU will give you.
If you look at when Daytona dave did his oil comparison dyno runs, you'll see it happening.
01-08-2015, 02:37 AM
#14
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Originally Posted by japcrap' timestamp='1420712072' post='23460472
[quote name='jimmyb1978' timestamp='1420709249' post='23460449']
Low Oil level will stop in engaging
And buying a later version will have a softer transition (from what I've read)
Low Oil level will stop in engaging
And buying a later version will have a softer transition (from what I've read)
If you want a more aggressive changeover, you'd probably be best off buying an older car!
Next meet local to you will be the next Herts meet on 5th February. The last meet thread is here, but I suspect a new one for February will appear soon. https://www.s2ki.com/...y-4th-december/
[/quote]
I much prefer the looks of the newer car, I would of gone newer than 05 were it not for the extortionate RFL. I can live with it how it is I just want reassurance I guess that it is functioning as it should, if it does turn out to be functioning correctly I propose that the phrase "vtec yo!" should be rephrased to "vtec yo!...unless you have an 04 onwards".
I think I'm guaranteed disappointment because if is functioning correctly then I don't really see what the hype is about (albeit on 04 onwards cars) and if it isn't then I'll be dipping even further into my pocket.
Where will the meet be on the 5th?
01-08-2015, 02:46 AM
#15
Originally Posted by Dembo' timestamp='1420714599' post='23460500
VTEC moves the cams so that more aggressive valve timing is used. There's only two positions; it can't be weak. It's either working or it isn't.
Whilst the cam profile is boolean, the ignition timing and fuelling isn't.
Winding back the ignition timing will cost you power and 'soften' the VTEC transition.
Throttle position, intake air temp, knock sensor all play on what the ECU will give you.
If you look at when Daytona dave did his oil comparison dyno runs, you'll see it happening.
01-08-2015, 03:17 AM
#16
A bad map sensor will mean that you don't get the feeling of extra power when you're in the VTEC rev range.
When VTEC engages its not like a big kick in the back but there is a distinct change in engine note and the feeling that the engine is pulling substantially harder than it was before.
When VTEC engages its not like a big kick in the back but there is a distinct change in engine note and the feeling that the engine is pulling substantially harder than it was before.
01-08-2015, 03:35 AM
#17
Registered User
Originally Posted by Ultra_Nexus' timestamp='1420715647' post='23460514
[quote name='Dembo' timestamp='1420714599' post='23460500']
VTEC moves the cams so that more aggressive valve timing is used. There's only two positions; it can't be weak. It's either working or it isn't.
VTEC moves the cams so that more aggressive valve timing is used. There's only two positions; it can't be weak. It's either working or it isn't.
Whilst the cam profile is boolean, the ignition timing and fuelling isn't.
Winding back the ignition timing will cost you power and 'soften' the VTEC transition.
Throttle position, intake air temp, knock sensor all play on what the ECU will give you.
If you look at when Daytona dave did his oil comparison dyno runs, you'll see it happening.
[/quote]
Like I said, the cam profile change is boolean, but what makes VTEC is the entire system and what people refer to as the VTEC kick is a combination of factors.
The OP describes his VTEC as soft so we can safely assume that the cam profile change has happened as the sound is a dead giveaway.
However, the extra acceleration isn't there which means that the ECU is making adjustments to either smooth out the map or prevent knock.
01-08-2015, 04:16 AM
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01-08-2015, 04:27 AM
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have you checked the accelerator cable is adjusted correctly, so you are actually using 'full' throttle
I had an MY04 previously and you could feel the acceleration change but it wasn't a kick like my EP3 does for example. I now have a 2008 S2000 and it feels pretty similar to the 2004 in the way that VTEC comes in
I had an MY04 previously and you could feel the acceleration change but it wasn't a kick like my EP3 does for example. I now have a 2008 S2000 and it feels pretty similar to the 2004 in the way that VTEC comes in