can someone direct me in the right path.

dirTy_shoeZ · 11-16-2010, 08:12 AM

Quote:

Originally Posted by 6spd

until someone cracks the vvel system, internals will probably be limited. its only a matter of time though.

Gotcha.... I appreciate the feedback some dumb some not so much lol. But you guys have definitely answered my question. Lol the answer is I can find cams cause there isn't any.. Lol so I'll get the bottom end and some port work going and let's see what kinda gains this thing has

I LOVE turbo cars and have never built an allmotor car but my judgement tells me that this is where the 370 should be

christian370z · 11-16-2010, 01:25 PM

I am sure with some porting and maybe looking at modifying the lower intake section, you can see some nice sized gains there. You can always get a custom grind on the stock exhaust camshaft but until you can dial in VVEL to match changes in lift on the exhaust side, I am not sure how much that will hinder you.

TypeOne · 11-16-2010, 05:24 PM

Forgive my limited knowledge when it comes to these engines, but is the cam angle variable? From what I read about the VVEL, it seems to only affect the valve lift... not acutally cam actuation.

Would these engines benefit from an adjustable cam gear, or is computer controlled much like the Honda K series i-VTEC engine?

dirTy_shoeZ · 11-16-2010, 08:58 PM

To my knowledge it's a bit more advanced than vtec... Your vtec advances the timing on the engine where vvel pulls ur valves open further which I'm assuming isn't so much the lift of the cam but the technology simply opening them up further. but I don't know much about it either. I'm waiting on my chick to watch her retarded shows so I can go pick a friend of mines head who went to school on these things.

Bardabe · 11-17-2010, 04:07 AM

i-Vtec controls the lift, different lift at different RPM. same as the VVEL on the 370Z difference being that you guys have a stepper motor to control the Lift AND duration. vs Honda having a Solenoid. the VQ engines have adjustable Cam Phasing in borth Intake and Exhaust. which is basically an adjustable cam gear. once the VVEL is cracked. if it can be tunned for better power and efficiency it will rock so hard i will most likely trade in my Z33 to a Z34

thats my understanding atleast.

Nitex · 11-17-2010, 12:34 PM

^^ agreed it will be very costly... i bet it would sound sick!

1slow370 · 11-19-2010, 03:05 AM

the exhaust cam phasing on the vq37 is not variable. The intake cam phasing is variable around +- 40 degrees. The valve lift and duration are increased and decreased by a single motor on the back of each head (it is a servo motor with magnetic feedback not a stepper). They are both increased together as a lever that looks like half a cam lobes swings up and down pushing the valve open, the further the lever swings (controlled by the motor on the back of the head) the farther the valve opens and the more time it takes to swing that lever farther means duration goes up as lift goes up.

Edit: also vtec cannot continuously vary the lift like vvel, with vtec you have high lift and low lift anywhere above a certain rpm you are using the high lift cam lobe anywhere below that rpm you are using the low lift cam lobe. vvel allows the computer to adjust te lift for the perfect balance of power and torque at any rpm.

Nitex · 11-19-2010, 10:57 AM

^^ Excellent explanation!

Bardabe · 11-19-2010, 12:50 PM

what about the cam over lap? isnt that what the cam phase sensors on the front of the engine are for?

cam phase = overlap control
vvel = lift and duration control

vtech = lift control
i-vtec = lift and overlap

atleast thats what the rsx guys are saying on their i-vtec

1slow370 · 11-20-2010, 03:33 AM

the inake valves have veriable timing so if you retard the intake timing you decrease overlap

1slow370 · 11-20-2010, 03:35 AM

Quote:

Originally Posted by Nitex

^^ Excellent explanation!

I should be getting good at it this is like the umpteenth thread to eventually need that explanation. I not explaning how it makes zero vacuum and throttles the engine though if they want to know that search for the vvel thread.

dirTy_shoeZ · 11-20-2010, 12:50 PM

ive been reading on it...this motor is super cool....they say not to mess with the adjustment in the cams yet as far as the vvel...but at the same time...someone has too right.

pistons are on order..should take a few weeks they said.

Staples · 11-27-2010, 02:13 AM

Port the heads and install oversize valves to help breath with the higher compression.

11-16-2010, 01:25 PM	#17 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 432	I am sure with some porting and maybe looking at modifying the lower intake section, you can see some nice sized gains there. You can always get a custom grind on the stock exhaust camshaft but until you can dial in VVEL to match changes in lift on the exhaust side, I am not sure how much that will hinder you. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

11-17-2010, 04:07 AM	#20 (permalink)
Bardabe Base Member Join Date: Aug 2010 Location: Austin Posts: 57 Drives: R32 GT-R Rep Power: 15	i-Vtec controls the lift, different lift at different RPM. same as the VVEL on the 370Z difference being that you guys have a stepper motor to control the Lift AND duration. vs Honda having a Solenoid. the VQ engines have adjustable Cam Phasing in borth Intake and Exhaust. which is basically an adjustable cam gear. once the VVEL is cracked. if it can be tunned for better power and efficiency it will rock so hard i will most likely trade in my Z33 to a Z34 thats my understanding atleast. __________________

11-17-2010, 12:34 PM	#21 (permalink)
Nitex Track Member Join Date: Jan 2010 Location: Seattle Posts: 848 Drives: '13 GTI Stage 2 UNI Rep Power: 16	^^ agreed it will be very costly... i bet it would sound sick! __________________ 2013 Drivers ED GTI \| Stage 2 Unitronic

11-19-2010, 03:05 AM	#22 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	the exhaust cam phasing on the vq37 is not variable. The intake cam phasing is variable around +- 40 degrees. The valve lift and duration are increased and decreased by a single motor on the back of each head (it is a servo motor with magnetic feedback not a stepper). They are both increased together as a lever that looks like half a cam lobes swings up and down pushing the valve open, the further the lever swings (controlled by the motor on the back of the head) the farther the valve opens and the more time it takes to swing that lever farther means duration goes up as lift goes up. Edit: also vtec cannot continuously vary the lift like vvel, with vtec you have high lift and low lift anywhere above a certain rpm you are using the high lift cam lobe anywhere below that rpm you are using the low lift cam lobe. vvel allows the computer to adjust te lift for the perfect balance of power and torque at any rpm. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 11-19-2010 at 03:09 AM.

11-19-2010, 10:57 AM	#23 (permalink)
Nitex Track Member Join Date: Jan 2010 Location: Seattle Posts: 848 Drives: '13 GTI Stage 2 UNI Rep Power: 16	^^ Excellent explanation! __________________ 2013 Drivers ED GTI \| Stage 2 Unitronic

11-16-2010, 05:24 PM	#18 (permalink)
TypeOne A True Z Fanatic Join Date: Jul 2010 Location: Baton Rouge, LA Posts: 2,682 Drives: BSM 370 Rep Power: 1851	Forgive my limited knowledge when it comes to these engines, but is the cam angle variable? From what I read about the VVEL, it seems to only affect the valve lift... not acutally cam actuation. Would these engines benefit from an adjustable cam gear, or is computer controlled much like the Honda K series i-VTEC engine?

11-16-2010, 08:58 PM	#19 (permalink)
dirTy_shoeZ Track Member Join Date: Jul 2010 Location: san antonio, tx Posts: 778 Drives: 40th ANN TT Rep Power: 16	To my knowledge it's a bit more advanced than vtec... Your vtec advances the timing on the engine where vvel pulls ur valves open further which I'm assuming isn't so much the lift of the cam but the technology simply opening them up further. but I don't know much about it either. I'm waiting on my chick to watch her retarded shows so I can go pick a friend of mines head who went to school on these things.

11-19-2010, 12:50 PM	#24 (permalink)
Bardabe Base Member Join Date: Aug 2010 Location: Austin Posts: 57 Drives: R32 GT-R Rep Power: 15	what about the cam over lap? isnt that what the cam phase sensors on the front of the engine are for? cam phase = overlap control vvel = lift and duration control vtech = lift control i-vtec = lift and overlap atleast thats what the rsx guys are saying on their i-vtec __________________

11-20-2010, 03:33 AM	#25 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	the inake valves have veriable timing so if you retard the intake timing you decrease overlap __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

11-20-2010, 12:50 PM	#27 (permalink)
dirTy_shoeZ Track Member Join Date: Jul 2010 Location: san antonio, tx Posts: 778 Drives: 40th ANN TT Rep Power: 16	ive been reading on it...this motor is super cool....they say not to mess with the adjustment in the cams yet as far as the vvel...but at the same time...someone has too right. pistons are on order..should take a few weeks they said.

11-27-2010, 02:13 AM	#28 (permalink)
Staples Track Member Join Date: Sep 2010 Location: Baltimore, MD Posts: 546 Drives: '08 Infiniti G37s Rep Power: 16	Port the heads and install oversize valves to help breath with the higher compression. __________________ '08 Infiniti G37s - Forced Induction Fed

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