No vtec on auto???
07-27-2004 | 04:45 AM
#1
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Racer
Joined: May 2004
Posts: 478
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From: LA, CA
No vtec on auto???
i was looking through dynos and went to injen website and came across this...
http://www.injen.com/webpages/testin...les/rd1430.gif
whats up with this? its a 5spd auto, and doesnt have a vtec jump untill 7, but thats redline.
http://www.injen.com/webpages/testin...les/rd1430.gif
whats up with this? its a 5spd auto, and doesnt have a vtec jump untill 7, but thats redline.
07-27-2004 | 05:32 AM
#2
Moderator Alumnus
Joined: Jul 2003
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From: Windsor-Quebec corridor
This dyno chart is way off. For some reason, the torque and hp values are not aligned, so it's difficult to get a good reading of the power at any given rpm.
Secondly, the torque and hp value surpass the fuel cutoff which is located at 7400rpm. And I would be surprised they even pulled past redline. I don't remember seeing any dyno going past 7200rpm.
I think there's something wrong with the dyno. The Vtec dip is just offset, but it definitely is there, otherwise you wouldn't see a flat torque curve, and you would see power going down from 5000rpm to the end.
Secondly, the torque and hp value surpass the fuel cutoff which is located at 7400rpm. And I would be surprised they even pulled past redline. I don't remember seeing any dyno going past 7200rpm.
I think there's something wrong with the dyno. The Vtec dip is just offset, but it definitely is there, otherwise you wouldn't see a flat torque curve, and you would see power going down from 5000rpm to the end.
07-27-2004 | 11:44 AM
#5
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Joined: Jan 2004
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From: Orange County
Well it really depends. I have been working with acura/honda for a while now. I bet you anything, the car was dynoed when the car is cold. The car's vtec engagement will be active once the car is warmer. Remember, vtec is also powered by oil.
07-27-2004 | 11:52 AM
#6
6MT Snob
Joined: Feb 2004
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From: Chicagoland
I have a 6MT and i still dont really feel the 'pull' or notice it as much as my friends old Civic SI which he had an intake on and when it hit vtec you KNEW it hit vtec..
The TSX is much smoother about it..
The TSX is much smoother about it..
07-27-2004 | 12:02 PM
#7
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From: Orange County
Remember your car has OBDIII now. That limits the speed with that vehicle. I can guarantee you that if you unbolt your exhaust pipe either from the muffler or from your headers, you will definitely feel the vtec. For those who are not familiar with Honda/Acura, they invented vtec to save gas and kick in at a higher RPM speed. Now for instance, if you are not a typical speed freak, would an old lady like to feel a jolt in speed when vtec kicks in? Another trick I learned from my B18c Civic, is to change the spring in the vtec solenoid. You can buy a longer (softer) spring from your hardware store and replace it. The stock spring is really compressed and not spring like. You can feel a 3hp difference.
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07-27-2004 | 02:50 PM
#8
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Racer
Joined: May 2004
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From: LA, CA
Originally Posted by DaiLo77
Well it really depends. I have been working with acura/honda for a while now. I bet you anything, the car was dynoed when the car is cold. The car's vtec engagement will be active once the car is warmer. Remember, vtec is also powered by oil.
but the dyno does past 7k where the dip starts.
07-27-2004 | 02:55 PM
#9
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Joined: Apr 2003
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From: Toronto, Canada
Originally Posted by TSX7
I have 5AT and I can hear VTEC but don't feel much when it kicks in.
Get an Injen. Vtec kickover is now very apparent at 6600RPM on my Auto. And fairly violent. The Injen seems to "wake up" the engine so to speak.
07-27-2004 | 02:56 PM
#10
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From: Toronto, Canada
Originally Posted by euroStyle
yeahhh, i forgot about that.
but the dyno does past 7k where the dip starts.
but the dyno does past 7k where the dip starts.
I emailed Injen about that particular dyno a awhile back and was told it was just miscalibrated. I posted the response somewhere in the forum. God knows it will be hard to find.
07-27-2004 | 03:02 PM
#11
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Joined: Apr 2003
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From: Toronto, Canada
Here's the response I got from InjenTech regarding this dyno.
I understand your concerns about the differences between your TSX and our TSX dyno graph redlines.The needle you see on your tachometer is mechanically driven by a motor which is given a signal from your engine control unit. The dyno picks up the electronic RPM signals inductively directly at the ignition source of the engine. So that means what you see is what you get, not waiting for the RPM signal to be converted to a mechanical signal which you see at your tachometer. The gauge sweep speed is not fast enough to keep up with the actual RPM signal but it is pretty dang close. You can actually run a few hundred RPM's past your actual redline before your rev limiter kicks in. If you pick up a good timing light with a RPM read out, you can measure the differences between your vehicles tachometer and whets really being picked up at the engine with the timing light. As RPM picks up the bigger the differences will be. If you have other concerns please don't hesitate to ask.
Regards,
Paul Ho
Head of Research & Development
Injen Technology Co. Ltd.,
Regards,
Paul Ho
Head of Research & Development
Injen Technology Co. Ltd.,
07-27-2004 | 05:39 PM
#12
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Joined: Jul 2003
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From: Windsor-Quebec corridor
Originally Posted by DaiLo77
Remember your car has OBDIII now.
Originally Posted by Injen
The gauge sweep speed is not fast enough to keep up with the actual RPM signal but it is pretty dang close. You can actually run a few hundred RPM's past your actual redline before your rev limiter kicks in.
07-27-2004 | 07:16 PM
#13
Registered AssHat
Joined: Feb 2003
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From: Portland, OR
Originally Posted by sauceman
Correction, that's OBD2b.
Actually, there is a margin of 3000rpm between redline and cutoff in 1st. There is also a margin of 3000rpm and cutoff in 5th. Lord knows it takes a while longer to reach that extra 300rpm in 5th. In that case the actual rev increase of the engine would not outrun the needle sweep, so there really is a cutoff at 7400, and not at redline like they seem to suggest.
Actually, there is a margin of 3000rpm between redline and cutoff in 1st. There is also a margin of 3000rpm and cutoff in 5th. Lord knows it takes a while longer to reach that extra 300rpm in 5th. In that case the actual rev increase of the engine would not outrun the needle sweep, so there really is a cutoff at 7400, and not at redline like they seem to suggest.
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