NISMO VTC Pulley...anyone running it
09-23-2004, 06:10 PM
#42
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mchapman - in an ideal world we could pick up the phone, call the NISMO engineers and ask "how does this work and what do we need to do to make it work on our US Spec car". I've made that phone call already to several people and was told "you are on your own". Discouraging? Not really as far as I am concerned - it's par for the course when dealing in high performance parts such as these.
The only way to do it is the way we are doing it...I will try it myself, and then report the findings, good bad or indifferent. These are not really designed for the mild cams out there (stage 1 NISMO, JWT). These are much better suited to the more aggressive cams with the increased duration (ala Esprit, Tomei 264 and 268 and the other NISMO cams offered in Japan)
Here is the translation from the NISMO catalog:
High declination VTC pulley
While VTC (the system which changes the cam central angle of INT with the condition of the engine) being attached and with the engine, utilizing VTC function when it is compatible the output improvement in the high rotary limits and the stability of idling and the guaranty of concave fast torque, this commodity made the "declination 55°" vis-a-vis the genuine "declination 40°", made degree of freedom of camshaft selection increase.
* When you use the operation angular large camshaft and, combining VTC declination large,
The valve recess should be guaranteed sufficiently that there is no interference of the INT valve and the piston,
There is a necessity.
The only way to do it is the way we are doing it...I will try it myself, and then report the findings, good bad or indifferent. These are not really designed for the mild cams out there (stage 1 NISMO, JWT). These are much better suited to the more aggressive cams with the increased duration (ala Esprit, Tomei 264 and 268 and the other NISMO cams offered in Japan)
Here is the translation from the NISMO catalog:
High declination VTC pulley
While VTC (the system which changes the cam central angle of INT with the condition of the engine) being attached and with the engine, utilizing VTC function when it is compatible the output improvement in the high rotary limits and the stability of idling and the guaranty of concave fast torque, this commodity made the "declination 55°" vis-a-vis the genuine "declination 40°", made degree of freedom of camshaft selection increase.
* When you use the operation angular large camshaft and, combining VTC declination large,
The valve recess should be guaranteed sufficiently that there is no interference of the INT valve and the piston,
There is a necessity.
09-23-2004, 06:33 PM
#43
Thats fine Adam as long as you have tried. 
OK so this new info sheds more light on the topic. The VTC system does pretty much what we had thought.
The VTC pulley allows the use of higher lift/duration cams with smooth idle and reduced loss of torque lower in the RPM range by adjusting the VTC system / intake cam further than normal. (55 degree max)
And you need to check you valve clearances.
Thanks for the additional info. I will definately buy this item when you have tried it out.
OK so this new info sheds more light on the topic. The VTC system does pretty much what we had thought.
The VTC pulley allows the use of higher lift/duration cams with smooth idle and reduced loss of torque lower in the RPM range by adjusting the VTC system / intake cam further than normal. (55 degree max)
And you need to check you valve clearances.
Thanks for the additional info. I will definately buy this item when you have tried it out.
Last edited by mchapman; 09-23-2004 at 06:45 PM.
09-23-2004, 08:25 PM
#45
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Originally posted by Orange Peel
i think they will improve gas mileage because the low end torque and responsiveness allows you to shift at lower rpms or hold higher speeds at lower rpms.
BUT also there is the fact that more air is being used and therefore more fuel need sto be injected. so It probably won't make enough power to out do the gas mileage effects, just Drive your Z less, J/K
Some one has to test it out, but unfortunately i don't know if they work with the stock heads i think you have to have the nismo RZZ heads.
Then you nee nismo cams (or nismo based cams) and valvestarin and valvesprings. that can become pretty expensive.
i think they will improve gas mileage because the low end torque and responsiveness allows you to shift at lower rpms or hold higher speeds at lower rpms.
BUT also there is the fact that more air is being used and therefore more fuel need sto be injected. so It probably won't make enough power to out do the gas mileage effects, just Drive your Z less, J/K
Some one has to test it out, but unfortunately i don't know if they work with the stock heads i think you have to have the nismo RZZ heads.
Then you nee nismo cams (or nismo based cams) and valvestarin and valvesprings. that can become pretty expensive.
Complaining about the lack of technology in a 350Z? You should go buy a Hemi. It comes with cylinder deactivation. VTEC MAD TTTEYYYTE@ YO@!!!
09-24-2004, 05:18 AM
#46
I noticed that the VTC gears are part of the s-tune package. So how much total power is gained with the S-tune package??
http://www.carnews.com.tw/1car/1car_...le_No=00000727
Laterz
Aceman
http://www.carnews.com.tw/1car/1car_...le_No=00000727
Laterz
Aceman
09-24-2004, 06:13 AM
#47
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sorry motr bldr, For questioning your car owning and your opinion.
But how can you say vtec is bull if it combines the best of both worlds?
Vtec doesnt make Hondas torqueless, the fact that it is a low displacement N/A 4 cyl with a 9k rpm red-line
But how can you say vtec is bull if it combines the best of both worlds?
Vtec doesnt make Hondas torqueless, the fact that it is a low displacement N/A 4 cyl with a 9k rpm red-line
09-24-2004, 07:24 AM
#48
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aceman:
That total VQ35S1 (that's how they call it) engine package will bring the power up from 206KW to 221KW..... while the torque figure reminds the same but max torque happens at 4400rpm and the redline for the engine will be up to 7200rpm (with the replacement of the con rod bolts which aren't shown).... 15KW = 20.4 HP with all of those! I think Nismo might be just a bit conservative on the figure they quote though!
cheers,
richie
That total VQ35S1 (that's how they call it) engine package will bring the power up from 206KW to 221KW..... while the torque figure reminds the same but max torque happens at 4400rpm and the redline for the engine will be up to 7200rpm (with the replacement of the con rod bolts which aren't shown).... 15KW = 20.4 HP with all of those! I think Nismo might be just a bit conservative on the figure they quote though!
cheers,
richie
09-24-2004, 04:55 PM
#49
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Originally posted by aceman
I noticed that the VTC gears are part of the s-tune package. So how much total power is gained with the S-tune package??
http://www.carnews.com.tw/1car/1car_...le_No=00000727
Laterz
Aceman
I noticed that the VTC gears are part of the s-tune package. So how much total power is gained with the S-tune package??
http://www.carnews.com.tw/1car/1car_...le_No=00000727
Laterz
Aceman
Stock
S-Tune
R-tune
S1 or Spec1
S2 or Spec2
R1
09-27-2004, 01:09 AM
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What about the new rumors of exaust side valve timing on the new track and aniversary edition? Is that true? Oh and this is a forum on engine mods. Why am I wrong for talking about engine mods? Isn't that the topic?
09-27-2004, 01:20 AM
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Originally posted by Orange Peel
What about the new rumors of exaust side valve timing on the new track and aniversary edition? Is that true? Oh and this is a forum on engine mods. Why am I wrong for talking about engine mods? Isn't that the topic?
What about the new rumors of exaust side valve timing on the new track and aniversary edition? Is that true? Oh and this is a forum on engine mods. Why am I wrong for talking about engine mods? Isn't that the topic?
09-28-2004, 01:00 PM
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Hey Man, I have a 350z. What are you talking about. I haven't driven a honda for almost two years. I have driven my Z more than i have driven my old acura. What is the Difference. Shall i start listing all the pos's you used to drive? Why are you rampantly trying to insult me, what is you're problem. I don't appreciate you're abnoxiousness. Please stop this. Thank you.
09-28-2004, 01:37 PM
#53
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Originally posted by Orange Peel
Hey Man, I have a 350z. What are you talking about. I haven't driven a honda for almost two years. I have driven my Z more than i have driven my old acura. What is the Difference. Shall i start listing all the pos's you used to drive? Why are you rampantly trying to insult me, what is you're problem. I don't appreciate you're abnoxiousness. Please stop this. Thank you.
Hey Man, I have a 350z. What are you talking about. I haven't driven a honda for almost two years. I have driven my Z more than i have driven my old acura. What is the Difference. Shall i start listing all the pos's you used to drive? Why are you rampantly trying to insult me, what is you're problem. I don't appreciate you're abnoxiousness. Please stop this. Thank you.
Please list all the POS cars I've ever driven. You're welcome.
10-21-2004, 04:11 PM
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Originally posted by IceY2K1Max
It only changes the intake cam, however I'm not sure exactly how.
According to the Z1 auto website they "increase overall cam advance to 55 degrees (15 degrees longer than stock)". However, I don't see where that "55 degrees" or "15 degrees longer than stock" come into play. From what I can find the VQ35 intake valve opening(IVO) range is 5ATDC-30BTDC and intake valve closing(IVC) range is 65ABDC-30ABDC.
So, does the NISMO VTC pulley cause the IVO to be sooner allowing "15 degrees longer" time to be open? If so, how when 30+15 is 45 degrees not "55 degrees"?
It only changes the intake cam, however I'm not sure exactly how.
According to the Z1 auto website they "increase overall cam advance to 55 degrees (15 degrees longer than stock)". However, I don't see where that "55 degrees" or "15 degrees longer than stock" come into play. From what I can find the VQ35 intake valve opening(IVO) range is 5ATDC-30BTDC and intake valve closing(IVC) range is 65ABDC-30ABDC.
So, does the NISMO VTC pulley cause the IVO to be sooner allowing "15 degrees longer" time to be open? If so, how when 30+15 is 45 degrees not "55 degrees"?
cheers,
richie
10-21-2004, 04:28 PM
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As far as I've found, the intake valve opening time max is 30-degrees BTDC.
As far as I can interpret from the Z1auto and a bad translation from nismo.co.jp, these VTC pulleys just increase the intake valve range by 15-degrees. So, the intake valve opening can be modified from 30BTDC-5ATDC +/-15degrees or the intake valve closing can be modified from 30ABDC-65ABDC +/-15degrees.
My guess at the meaing of "increase overall cam advance" means 30BTDC + 15BTDC for 45-degrees not 55-degrees. Hopefully, someone tries these soon and they help fix the loss of torque from the JWT cams below 4-5Krpm.
As far as I can interpret from the Z1auto and a bad translation from nismo.co.jp, these VTC pulleys just increase the intake valve range by 15-degrees. So, the intake valve opening can be modified from 30BTDC-5ATDC +/-15degrees or the intake valve closing can be modified from 30ABDC-65ABDC +/-15degrees.
My guess at the meaing of "increase overall cam advance" means 30BTDC + 15BTDC for 45-degrees not 55-degrees. Hopefully, someone tries these soon and they help fix the loss of torque from the JWT cams below 4-5Krpm.
10-21-2004, 05:27 PM
#56
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if the member who sold me the heads (which were advertised as complete) would ever send me the cam caps that I have been waiting months for, I could tell you guys more about them.
I have cams, springs, pullies all ready to go...but cannot do anything without the cam caps I was promised to receive
I have cams, springs, pullies all ready to go...but cannot do anything without the cam caps I was promised to receive
10-21-2004, 06:07 PM
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at this point, unless I find another set of heads to use, or this member sends me what I should have received initially, we'll be waiting quite a while. I simply cannot have the downtime of taking my current heads off the car
10-21-2004, 06:18 PM
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Z1:
Do you know if our original computer controls the cam gears at all? because I am going to do the same thing without the heads(cams, pullies, springs, con-rods) soon... and am searching for computers to use at this stage...... There are a few options:
1. HKS F-Con V Pro
2. Motec M6 + Cams control module + Drive-By-Wire Module..
the 2nd option will be a lot dearer, just wondering to know if you know that HKS F-Con V Pro can handle the job?
cheers and many thanks!
richie
Do you know if our original computer controls the cam gears at all? because I am going to do the same thing without the heads(cams, pullies, springs, con-rods) soon... and am searching for computers to use at this stage...... There are a few options:
1. HKS F-Con V Pro
2. Motec M6 + Cams control module + Drive-By-Wire Module..
the 2nd option will be a lot dearer, just wondering to know if you know that HKS F-Con V Pro can handle the job?
cheers and many thanks!
richie
10-22-2004, 08:57 AM
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Yes, per the FSM....
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the camshaft timing control valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the camshaft timing control valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.
Originally posted by Z350Lover
Z1:
Do you know if our original computer controls the cam gears at all? because I am going to do the same thing without the heads(cams, pullies, springs, con-rods) soon... and am searching for computers to use at this stage...... There are a few options:
1. HKS F-Con V Pro
2. Motec M6 + Cams control module + Drive-By-Wire Module..
the 2nd option will be a lot dearer, just wondering to know if you know that HKS F-Con V Pro can handle the job?
cheers and many thanks!
richie
Z1:
Do you know if our original computer controls the cam gears at all? because I am going to do the same thing without the heads(cams, pullies, springs, con-rods) soon... and am searching for computers to use at this stage...... There are a few options:
1. HKS F-Con V Pro
2. Motec M6 + Cams control module + Drive-By-Wire Module..
the 2nd option will be a lot dearer, just wondering to know if you know that HKS F-Con V Pro can handle the job?
cheers and many thanks!
richie