I thought I would chime in here and give some very basic and general knowledge about VTC and how cam timing plays a roll in the K series tuning sequence. This thread is for basic knowledge and that's all.
First things first, lets answer a few questions with the knowledge of already knowing how Vtec works.
1) What is VTC?
A) Variable Overlap Timing Control
2) What is I-Vtec?
A) It is a combination of VTEC+ VTC
3) How Does it work?
A)
4) Why is VTC important for any engine setup?
A) VTC plays a huge roll in overall driveability & maximum SAFE horsepower.
5) I've heard that with some camshaft designs I can't use full VTC operation, is that true?
a) Yes, that is true. With some stage 1 and up camshafts, you will have valve to valve (v/v) or valve to piston (v/p) contact. It is always best to clay the motor first with any big camshaft (recommended on stage 2 & 3 cams)
6) I've contacted the cam manufacturer in regards to how much advance I can take with VTC and they said I can use full rotation (50 Degrees). Will my setup benefit from this?
A) Yes and no. Some setups, mild to wild, will require 50 degrees (i.e. Those stage 1 cams with a high flowing race header) for maximum mid-range torque. Stage 2's on the other hand, based on my personal experience, can make max. torque with only 35 degrees advance. This is only an example and every setup is different and will require a full vtc tune to its max safe potential.
7) I have hondata FlashPro, a cai, a custom race header and a custom 2.5" exhaust. There is no base map or starting calibration that is close to my setup. What should I use?
A) I would use a standard race header calibration to start & don't go full throttle until you get it professionaly tuned. If you know anything about Flashpro, you may retard VTC to 0 and set your rev limit to 5k, with a vtec point of 5100 rpm (this disables vtec). Then add 15% fuel to all load columns just to be on the safe side. *Some FlashPro calibrataions are based off the intake you have on your si*
8) I have an exact setup to one calibration provided (flashpro or cobb). How do i know if the VTC is proper for my setup?
A) There are several ways to do those. One way is a full dyno/street tuning with a torque plotting program. The 2nd way is to play around by adding and subtracting cam timing to see where you can benefit from adjustments.
9) What does a K series VTC plot for each VTC angle look like?
These are only a few pointers that I could give without teaching a class. I hope this is a good introduction and questionnaire. Anyone who wishes to ask a question that is not on the list & that question is basic, please ask away. If there is an error, please advise. I am human after all
Mods please sticky
Regards,
Mike @ Elite Tuning
Taken from 8thcivic.com (http://www.8thcivic.com/forums/ecu-tuning-information/174913-k-series-cam-timing-setups-101-a.html)
4) Why is VTC important for any engine setup?
A) VTC plays a huge roll in overall driveability & maximum SAFE horsepower.
5) I've heard that with some camshaft designs I can't use full VTC operation, is that true?
a) Yes, that is true. With some stage 1 and up camshafts, you will have valve to valve (v/v) or valve to piston (v/p) contact. It is always best to clay the motor first with any big camshaft (recommended on stage 2 & 3 cams)
6) I've contacted the cam manufacturer in regards to how much advance I can take with VTC and they said I can use full rotation (50 Degrees). Will my setup benefit from this?
A) Yes and no. Some setups, mild to wild, will require 50 degrees (i.e. Those stage 1 cams with a high flowing race header) for maximum mid-range torque. Stage 2's on the other hand, based on my personal experience, can make max. torque with only 35 degrees advance. This is only an example and every setup is different and will require a full vtc tune to its max safe potential.
7) I have hondata FlashPro, a cai, a custom race header and a custom 2.5" exhaust. There is no base map or starting calibration that is close to my setup. What should I use?
A) I would use a standard race header calibration to start & don't go full throttle until you get it professionaly tuned. If you know anything about Flashpro, you may retard VTC to 0 and set your rev limit to 5k, with a vtec point of 5100 rpm (this disables vtec). Then add 15% fuel to all load columns just to be on the safe side. *Some FlashPro calibrataions are based off the intake you have on your si*
8) I have an exact setup to one calibration provided (flashpro or cobb). How do i know if the VTC is proper for my setup?
A) There are several ways to do those. One way is a full dyno/street tuning with a torque plotting program. The 2nd way is to play around by adding and subtracting cam timing to see where you can benefit from adjustments.
9) What does a K series VTC plot for each VTC angle look like?
These are only a few pointers that I could give without teaching a class. I hope this is a good introduction and questionnaire. Anyone who wishes to ask a question that is not on the list & that question is basic, please ask away. If there is an error, please advise. I am human after all
Mods please sticky
Regards,
Mike @ Elite Tuning
Taken from 8thcivic.com (http://www.8thcivic.com/forums/ecu-tuning-information/174913-k-series-cam-timing-setups-101-a.html)
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