Engine Swap Forum

i flipped them because it wont fit. im tempted to convince him to go turbo just for cool factor and the obvious boost (heh) of the fun factor. he picked up some headers for me to modify. i couldnt figure out how to lift the motor sans headers. i felt the load induced on the composite valve covers if i chained to the manifold studs would be too much.

peej410:

would a VQ35 flywheel be swappable to a VG?  finding a VG30DE to look at around here would be about as difficult as finding a new S30 shell! no pick n pulls to walk through in these parts. i will look into it though!

 

You could probably call Jim Wolf Technology, I believe they sell aftermarket flywheels for both motors, maybe they could help.  Or, better yet contact a company that actually makes aftermarket flywheels maybe they have spec sheets for both.

 

Fred

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Instrument Cluster and Speedometer Repair

I know this is not definitive proof, and I am speaking from memory here, but I think I remember seeing fidanza or another well-know flywheel vendor using the same part number for 89-2001 Maxima. Now as you probably know, the 89 Maxima was VG30E based and the 1995+ was VQ30DE based. So it is quite possible that the VG30DE and VQ30DE are interchangeable, if not practically the same. Now thats a big if, and still says nothing about VG30DE and VQ35DE compatability.

Best of luck. I don't have any of these engines laying around so I have no way to confim this.

I have access to a VG30E flywheel ('88 300z) and of course a few VQ flywheels, I'll snap a pic for us to look at.

 

Fred

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Instrument Cluster and Speedometer Repair

Fred Allen Burge:

I have access to a VG30E flywheel ('88 300z) and of course a few VQ flywheels, I'll snap a pic for us to look at.

Fred

If it's not too much trouble, could u slap a tape measure in those pics on those flywheels, please.

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Argh... guess I'll stick w/ the plan...

bettonracing:

Fred Allen Burge:

I have access to a VG30E flywheel ('88 300z) and of course a few VQ flywheels, I'll snap a pic for us to look at.

Fred

If it's not too much trouble, could u slap a tape measure in those pics on those flywheels, please.

 

Sure can!

 

Fred

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Instrument Cluster and Speedometer Repair

Ok guys here they are:

Please note that I mislabeled the flywheel on the LH as a Z33, it's actually from a 95 Maxima.  But, it's okay because the Maxima and the 350z (Z33) share bolt patterns on the crank and bolt patterns for the pressure plate.

 

This pic shows a 350z clutch pressure plate (yes, 350Z, I did get that right) bolts directly onto the 300z's flywheel incase anyone wants to try some frankenstein clutch combo's.

 

So, obviously the VQ uses an 8 bolt crank vs. the VG30E's 6 bolt so this flywheel is out of the question.  But, can anyone tell me what's the more important detail in these pics concerning using the VG ECU on a VQ...........? 

 

 

Fred

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Instrument Cluster and Speedometer Repair

I gues it was the VG30DE and TT that have an 8-bolt flywheel pattern, not the older SOHC VG30E. Sorry for the confusion.

SSDwellah:

I gues it was the VG30DE and TT that have an 8-bolt flywheel pattern, not the older SOHC VG30E. Sorry for the confusion.

I see, yes, google proves you correct!  But, what I was getting at is the flywheel isn't even an issue here, if you look closely there's no crank sensor timing ring on the 300z flywheels so there is no rear crank sensor so a person wouldn't need to use a 300z flywheel on a VQ motor to use the 300z ecu on the VQ motor.  But, there's still many issues to look into, mainly the cam sensor.

 

Fred

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Instrument Cluster and Speedometer Repair

I read something within the last week that stated that the older [nissan] VTC systems were more like a switch (adv/ home/ ret) rather than the pulse width modulation that the VQ35 VTC would be looking for. IIRC even some of the VQ30 VTC's were 'switches' rather than PWM. Somebody please verify this info.

(Assuming the above information is correct...)

Would there still be an advantage to using the 300zx ecu?... (I'll even help: COP's & sequential inj are 2 points).

Kurt

 

Edit: http://forums.freshalloy.com/showthread.php?t=71181 <-- hints at what I was saying. Still searching for my source.

*mumbles under breath*
"Megasquirt!"

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Argh... guess I'll stick w/ the plan...

Kurt,

With all due respect, I don't think that is entirely correct. The VG30DE was the first Nissan with electronic variable valve timing (and the first of any cars I know of with electronic vvt at all), so I'll admit it might be the most primitive. The system is called N-VCS.

I don't recall where I read it but I think the older ones may have a different range. For example perhaps the original VG30DE can only vary the cam phase by +10 degrees whereas the VQ might allow +15 degrees. This is just an example. Also, some don't allow intake and exhaust to be varied (e.g. the RB25DEonly has VVT on the inlet cam). Maybe the VQ35DE is like this. I don't have a 350Z FSM so I can't verify this.

Also what do you mean about the VQ30DE? As far as I know, there were no VQ30's with VVT, especially in the US. Are you talking about the VQ30DET or race only VQ30DETT? I haven't heard of any VQ30's with VVT, that's all I know.

Anyway, in a related news... did anyone here know that greddy has an emanage adapter to control NVCS??? Maybe jwt can make you something similar as a daughter board to a VQ30DE ECU to run a VQ35 w/ vvt. If I had the spare time and parts I'd be all over this. It seems like very basic electronics would be necessary and I am quite good with that.

I agree that there were "minor" mechanical differences throughout the years (smaller range of motion/ intake only/ intake and exhaust/ etc) but the activation between the 300zx & the 350z are different (hence using the vg30de ecu on a VQ35 could propose a problem where controlling VTC's are concerned).

 This thread (http://www.msefi.com/viewtopic.php?p=147702&highlight=vtc#147702) reinforces that the VQ35 VTC system uses PWM (pulses to operate the advance or retard of the cam). See the excerpts from the FSM.

This thread (http://ecu2.forumwise.com/ecu2-thread1227.html) also reinforces my point that the VG30de /dett engines uses an on/off switch to activate its VTC system.

Sorry for any incoherence in my previous post.

Kurt

Edit: The VQ30's that I was referring to was the 3.0L maxima engines

Edit #2: Maybe we should stop taking over this build thread and start one in the stand alone ecu's forums?

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Argh... guess I'll stick w/ the plan...

Ok if they are using pwm, then it sounds like this is some newer continuously variable  valve timing. In that case I stand corrected. Perhaps the older system just had two settings (on/off)? I thought it allowed a variable amount of oil in based on rpm but I could be mistaken. Anyway, if the new design is pulsewidth modulated, it still sounds something that could be controlled completely separate from the main ecu. Although it may be invonvenient to have two boxes, you really just need something that does pwm based on a table lookup with rpm on one axis and perhaps throttle angle on another. That would give you reasonable control. Sounds simple electronically, and a lot of standalones will have spare PWM outs for applications like this.

I agree that it seems to be a really simple electrical solution. I'd even investigate the throttle idle circuit on the stock 300zx ecu to see its signal type and input conditions.

If only there was somebody out there who'd gotten their VQ35 VTC's to work on their megasquirt... They'd have the details we need but surely they'd post it on their own website's forum... Wonder if there's anybody out there with VTC working on their megasquirt that would have input on the matter?... Anybody? Anybody? Beuler?...

(That was directed at Fred btw but who's pointing fingers...)

Let's await the professional's news (preferrably in a new thread) to continue the information. I'm sure I'm not the only one who hates scrolling thru 6 pages of [not directly related] disccussion just to see progress pics/posts. 

I wonder how good the local webmasters are at thread editing...

Kurt

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Argh... guess I'll stick w/ the plan...

bettonracing:

I agree that it seems to be a really simple electrical solution. I'd even investigate the throttle idle circuit on the stock 300zx ecu to see its signal type and input conditions.

If only there was somebody out there who'd gotten their VQ35 VTC's to work on their megasquirt... They'd have the details we need but surely they'd post it on their own website's forum... Wonder if there's anybody out there with VTC working on their megasquirt that would have input on the matter?... Anybody? Anybody? Beuler?...

(That was directed at Fred btw but who's pointing fingers...)

Let's await the professional's news (preferrably in a new thread) to continue the information. I'm sure I'm not the only one who hates scrolling thru 6 pages of [not directly related] disccussion just to see progress pics/posts. 

I wonder how good the local webmasters are at thread editing...

Kurt

 

Ok, i'll start another thread.  I tried to be super-fancy-all-knowing-moderator-guy :) but I kinda screwed the thread up a little and deleted a couple posts, sorry guys!  Anyway, I'll try to make a new thread with most of the important stuff from here copied there.

 

Fred

 

 

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Instrument Cluster and Speedometer Repair