VQ35 cams in a VQ30
03-03-2005, 07:46 AM
#81
When you say VQ30 cams, you're referring to JWT VQ30 cams and NOT stock VQ30 cams, correct?
Originally Posted by Nismo3112
But my plan is to use VQ30 cam gears with the VQ30 cams, in a VQ35 head, ofcourse along with the VQ30 front and rear timing covers. Do-able? Tilley?
I guess if Tilleys doing it, it should be okay.
03-05-2005, 07:08 AM
#90
Originally Posted by Nismo3112
Hmmm, if it isnt too expensive for him to drill the (VQ35 cams??), then i'll go that route.. But aren't the spacers only needed for the intake cam gears because the exhaust cam gears are thicker?
[img]http://img233.exs.cx/img233/6466/camgears2im.jpg[img]
[img]http://img233.exs.cx/img233/6466/camgears2im.jpg[img]
03-07-2005, 09:41 AM
#92
japmaxSE said he only paid $40+shipping.
Originally Posted by emmas97
spacers were 40 for a set of 2 only..... so for the whole set its like 80 or something..... and tilley says his will be cheaper 
03-08-2005, 06:48 AM
#97
Supporting Maxima.org Member
Join Date: Aug 2004
Posts: 485
at the time that japmax bought them, apparently they werent dealer only products, but they switched that i guess and when they made it a dealer/business only product, they bumped the price.... (i dunno thats what i was told)
04-05-2005, 07:17 AM
#106
What are you doing relative to cam timing?
Using the EM section specifications of the VQ30 FSM as an example the intake opens at 3deg btdc and the exhaust closes at 3deg atdc, an over lap of 6deg, that seems pretty good and would be a target. If you look over the VQ35 FSM the exhaust is fixed at 8deg atdc, but check the intake... it shows 6deg btdc so an overlap of 14 deg, more than double the VQ30 overlap, not good for boosted applications. BUT the total duration of the VQ35 intake cam (dimension b) shows as 238deg, But add up the other dimensions (c)6btdc + 180 + (d)64 abdc = 250deg of duration? so is the 250deg total timing with the vtc control? if so thats only +/-12deg off the (b) dimension. Now if you check the EC section of the VQ35 FSM and look at the IVT section the control indicated zero to -5deg at idle and zero to +30deg after 2000rpm. That dosent make sense to me, i must be missing somthing. This is important to know so the VQ35 cams can be timed properly in a VQ30. If the cam advance is wrong it can hurt power, excessive overlap is BAD for a boosted car.
What ya know?
Using the EM section specifications of the VQ30 FSM as an example the intake opens at 3deg btdc and the exhaust closes at 3deg atdc, an over lap of 6deg, that seems pretty good and would be a target. If you look over the VQ35 FSM the exhaust is fixed at 8deg atdc, but check the intake... it shows 6deg btdc so an overlap of 14 deg, more than double the VQ30 overlap, not good for boosted applications. BUT the total duration of the VQ35 intake cam (dimension b) shows as 238deg, But add up the other dimensions (c)6btdc + 180 + (d)64 abdc = 250deg of duration? so is the 250deg total timing with the vtc control? if so thats only +/-12deg off the (b) dimension. Now if you check the EC section of the VQ35 FSM and look at the IVT section the control indicated zero to -5deg at idle and zero to +30deg after 2000rpm. That dosent make sense to me, i must be missing somthing. This is important to know so the VQ35 cams can be timed properly in a VQ30. If the cam advance is wrong it can hurt power, excessive overlap is BAD for a boosted car.
What ya know?
04-05-2005, 03:32 PM
#107
Yeah, the VQ35 FSM seems to have an error, but those numbers don't include VTC operation. VTC operation is shown here:
A bit more overlap would hurt spoolup somewhat, but the increased duration and lift would really help top end. Also, with a SC car a bit of boost being lost during overlap is a concern, however with a turbo you can just compensate by running a bit more boost.
A bit more overlap would hurt spoolup somewhat, but the increased duration and lift would really help top end. Also, with a SC car a bit of boost being lost during overlap is a concern, however with a turbo you can just compensate by running a bit more boost.
Originally Posted by MardiGrasMax
What are you doing relative to cam timing?
Using the EM section specifications of the VQ30 FSM as an example the intake opens at 3deg btdc and the exhaust closes at 3deg atdc, an over lap of 6deg, that seems pretty good and would be a target. If you look over the VQ35 FSM the exhaust is fixed at 8deg atdc, but check the intake... it shows 6deg btdc so an overlap of 14 deg, more than double the VQ30 overlap, not good for boosted applications. BUT the total duration of the VQ35 intake cam (dimension b) shows as 238deg, But add up the other dimensions (c)6btdc + 180 + (d)64 abdc = 250deg of duration? so is the 250deg total timing with the vtc control? if so thats only +/-12deg off the (b) dimension. Now if you check the EC section of the VQ35 FSM and look at the IVT section the control indicated zero to -5deg at idle and zero to +30deg after 2000rpm. That dosent make sense to me, i must be missing somthing. This is important to know so the VQ35 cams can be timed properly in a VQ30. If the cam advance is wrong it can hurt power, excessive overlap is BAD for a boosted car.
What ya know?
Using the EM section specifications of the VQ30 FSM as an example the intake opens at 3deg btdc and the exhaust closes at 3deg atdc, an over lap of 6deg, that seems pretty good and would be a target. If you look over the VQ35 FSM the exhaust is fixed at 8deg atdc, but check the intake... it shows 6deg btdc so an overlap of 14 deg, more than double the VQ30 overlap, not good for boosted applications. BUT the total duration of the VQ35 intake cam (dimension b) shows as 238deg, But add up the other dimensions (c)6btdc + 180 + (d)64 abdc = 250deg of duration? so is the 250deg total timing with the vtc control? if so thats only +/-12deg off the (b) dimension. Now if you check the EC section of the VQ35 FSM and look at the IVT section the control indicated zero to -5deg at idle and zero to +30deg after 2000rpm. That dosent make sense to me, i must be missing somthing. This is important to know so the VQ35 cams can be timed properly in a VQ30. If the cam advance is wrong it can hurt power, excessive overlap is BAD for a boosted car.
What ya know?
Thanks Tilley!
04-06-2005, 09:04 AM
#111
That's what I was thinking/wondering, ie adjusting the intake cam advance angle to work with the stock exhaust cam.
I have a SAE tech doc on the VQ35s that includes some kind of chart on the optimal RPM for IVC to produce peak torque in the low, then mid, and finally top-end. However, it is pretty hard to read and I can't make much of it anyways.
Isn't there a program/tool like Cam Doctor or something that some shops use to run a cam through and it measures all the cam specs?
I have a SAE tech doc on the VQ35s that includes some kind of chart on the optimal RPM for IVC to produce peak torque in the low, then mid, and finally top-end. However, it is pretty hard to read and I can't make much of it anyways.
Isn't there a program/tool like Cam Doctor or something that some shops use to run a cam through and it measures all the cam specs?
Originally Posted by MardiGrasMax
Thanks Ice... I suppose a degree wheel could nail down where to drill the new pin hole in the propper location so the overlap is not an issue.
