I don't know if I'm making sense of things, but doesn't the short block have an effect on the crankshaft. The VQ30 has a smaller crankshaft compared to the VQ35. That means the choosing of the short block is relative to what type of stroke you want.

Also, a custom 103mm bore sounds crazy. Does the vq35 heads line up with the vq30 short block? Wouldn't there be function problems b/c the 35 heads are meant for a longer stroke?

 

I believe the older VQ35's have the same bearings as the VQ30s, as there has been VQ33 strokers (VQ35 rods/crank, VQ30 every thing else, that makes 11.X:1 compression and 3.3L) and VQ32 destrokers (is that a word?lol....32= VQ30 crank/rods in VQ35 every thing else.

I believe the rev up engines are the different diameter cranks.

For the heads they can interchange with no issues. The VQ35 has larger chambers so you get less CR, but they flow more then the VQ30 heads.

WOW a 3.6L VQ30...That sounds kick ****!!! Has any one measured the stock VQ30 sleeves?

~Alex

 

Torque.......

 

Never heard of this.

Nope. Same exact crank.


What do you mean? The bore diameter? 93mm...

 

http://forums.maxima.org/showthread....t=vq33+stroker

There ya go. I would have thought you would know about it??? Any way it was in the stickies at the top of this forum.

I meant the thickness of the VQ30 sleeve. AKA with out having it re-sleeved how much could you bore a VQ30 out too.

~Alex

 

I had seen that thread, but i never heard of it up and running. Apologies...

 

lol its all good. I just skimmed through it again and LOL @ IceY2k1 saying you cant use 3.5L heads on the 3L because of the VVT. But then that was in 04 so I guess we can excuse that!

 

what is the cost on the setup here for just building the block?? like pistons, rods, sleeves, etc. this seems interesting for me since i am lookin into rebuilding my 3.5 but i'm not sure what to do as of yet.

 

^^Why sleeves?

 

VQ35 has under piston oil squirters.

 

isnt the 3.5 block lighter? if youre looking to save weight that would be a huge advantage

 

No one ever said this. The whole assembly is lighter, not necessarily the block.

 

I have heard the vq35de can rev 7000-7200rpms stock and I also know people who have put aftermarket cams without rod bolts or vavle springs and have had it 4 a while and have had no problems at all. Please shed some light on this. Good luck on yall projects, this will pave the way 4 many more high revving motors to come. Keep us posted on ur progress

 

There's a considerable difference between 7200 and 8000 RPM.

 

What do you mean by oil pump ring gear?

 

theres a ring gear that slides over the crank . that spins the oil pump the 3.5 one will not work so you must use your 3.0 one.
i call it ring gear could be called something else

 

I see what you're talking about now. I looked in the FSM and the part that fits over the flats on the crank is the inner rotor. Based on the diagram the oil pump is an extremely simple device. There's just an inner rotor, an outer rotor, the regulator valve, the spring, and regulator plug. IMO, putting in the 3.0 inner rotor would kind of defeat the purpose of using the 3.5 oil pump since it would basically be half 3.0 pump and half 3.5. There's no guarantee that the 3.0 inner rotor can even be used with the 3.5 outer. And according to this thread (http://forums.maxima.org/showthread.php?t=486828) the 3.5 pumps work with no problems. What makes you think it wont?

 

-----------------------

 

Some quick Q's,

What does a VQ30 flow stock (XXX CFM intake/exhaust)?

And has any one used VK45 valves in their VQ30? Seems like a great upgrade for the RPM's we want

Also is there any benefit for porting for a turbo setup? This will be in a S13 with 2 T22's or T25.

Also how would one compression test an engine on the stand? Build a bracket for the starter? I don't have a tranny.

Thanks guys, interesting thread for sure.

~Alex

 

there was talk about using VK valves but i dunno if its been done yet...and who completed the VQ stoker VQ35 rods/crank, VQ30 every thing else and got it running...i was watching the thread along time ago but i dunno if anything developed

 

This should be the most important factor to everyone. Squirters for FI are a huge advantage. I'm assuming this to be true for the extremely hot CC temps that high compression will yeild. That alone rules out the 30 block. for me.



Alex, if you're doing the S chassis swap you'll need a Z33 upper oil pan. That will allow the Z33 starter to bolt up directly. That should be all fine and good but you better be sure to strap that stand down well.

 

Well it looks like the VQ36DE idea is not going to materialize:

"Hello Thomas,

The VQ35 and VQ30 blocks are not casted the same so the VQ35 kit will
not work in the VQ30 block. We do not have nor do we plan on making a
kit for the VQ30 because they are no where near used as much as the VQ35
for high performance applications.

The max bore size of the VQ35 is 100mm. There is no way to go larger
because of the bore spacing of the block and because the way it was
casted. Anything larger than 100mm and you will have problems sealing a
head gasket because there is not enough material between the cylinders.

The VQ35 would be the best way to go because there have been tested and
prove to make very high amounts of horsepower with our kits reliably.

Let me know if you have any more questions.

Thanx,

John"

I am going to look into just how high I can rev the 81.4 mm stroke safely with forged rods and lightweight pistons.

You make a very good point.

 

So the ultimate engine is, VQ35 block, 3L crank,cams, 100mm bore, big turbo, high redline?

Sounds fun to me!! That would be fun in the opera 350z....stupid fast....

Broaner- I know, Ive read all the VQ swap threads on FA, freds site, and all the other well known builds including yours. Oh and Ill be up in Wisconsin soon, (walkeshaw sp?) maybe I can stop by.

~Alex

 

Tilley did the VK valves when he did his VQ32 but from what he said, it wasnt a direct swap. I would get in touch with him for more info.

 

if you want to rev higher:

1) Build your head; after market valves, springs and retainers.
2) Lightened crank, get it shaved at the machine shop.
3) get a standalone ecu and here is where I will give away my secret.
the Wolf 3D standalone ( very expensive $2500 ) will let you rev up to 10k if you're head and bottom end is build.

I was planning for months now to build a 600 HP maxima..built head, sleeved block, custom pistons and forged internals...but no matter what I do..my maxima will never able to keep up with my 600 hp integra..so it's a waste of money.

 

As generic an answer as you will ever see. I'm sorry...

 

I've seen 3.5s none sleeved that pushes over 600whp. its the high reving that is nt common.

 

See the post before your's.

 

hence I was agreeing with you....
Let me make it crystal clear for you.... Studio718's post was very generic....

 

What about this:

VQ32 using:
3L crank, rods and HEADS
3.5L block pistons
also toss in VK45 valves and if your going extreme JWT VQ30 springs

Its late for me, but wouldn't that increase compression over the VQ30 correct? Plus the little extra displacement, add a little porting a variable intake system (DEK or the 3.5L VI which ever flows better) and BAM a great all nissan VQ screamer. I also have several ideas for ITB's that should be pretty sick when combined with a fully tuneable ECU

Any way time to rest the insanity that is my brain...

~Alex

 

Why you people insist on messing with the displacement is beyond me.

 

Being able to rev to 8K+ is the big reason. Plus with my build all I have to do is switch back to VQ35 heads and then Ive got a platform for my eventual turbo setup. Then you also have the 100mm over bore option as well, with the 73.3mm crank that would be interesting at high revs...

~Alex

 

Ummm...who said you couldn't rev to 8k using the stock 3.5 stroke? Mythology i tell you....

 

Why !?!?!

 

Ok I'll STFU start building and come back in the summer.

~Alex

 

Enjoy....

 

Oh I will. I just cant wait to get some parts ordered and start my mock up.

~Alex

 

exactly...

You can safely rev a stroked vq35 (AEBS 4.3L stroker kit, 90mm stroke) to 8400 rpm since it utilizes top notch forged parts...

 

I am sure you will love the VQ30 heads

 

Yea but how many miles of daily driving can the AEBS take before its time for new rings/general rebuild?

The goal of my VQ32 is power and reliability.

Can porting improve the 3L heads? I know they don't flow as well as the 3.5L's but is it that huge of a difference? Does anybody have flow in CFM for the 2 heads?? or just OMG it wont work. Guess how many times thats been said on the org and it wasn't quite true....

~Alex