nismology

iTrader: (8)

We're uber excited about your future setup!!

krismax

iTrader: (15)

if i "HAD" to keep the 3.0 heads ,i wouldnt use maxima ones and i would reduce the valvetrain weight down to a 3.5 weight.

The 3.5 heads are so much better than 3.0's its the difference between a ferrari and a yugo

Kevlo911

iTrader: (36)

Yeah, if you did some research you would see that the 30heads are pretty ****ty and there are better ways to make your vq32.

Alex_V

So then whats the best 3L head to use? I30? DEK? JDM only DET? Or the 3.5L heads with the 3L chamber Cosworth makes (probably out of my budget).

~Alex

Broaner

iTrader: (10)

AEBS is old news and ****ty compared to...
http://my350z.com/forum/showthread.php?t=224931

nismology

iTrader: (8)

Wow...first of all, all 3.0 heads are the same. Secondly, none of the 3.0 heads are worth it. Dunno why you're stuck on that idea. Lastly, the nismo heads are the ones with the 3.0 combustion chambers. See my post in MDeezy's thread explaining why the nismo heads aren't for the average modder.


It seems like you're trying to reinvent the wheel, just for the sake of reinventing the wheel...

Hoooper

i dont see why you want 3.0 heads so badly. we have seen on the .org that the bump in CR is more than negated by the difference in flow. plus the 3.5 heads have shown ability to accept more timing advance which means even more power. its not like the 3.0 head will make your motor more rev friendly, if anything the 3.5 head will with its superior cooling and flow characteristics.

krismax

iTrader: (15)

Mod for mod i dont care what you do to a 3.0 with 3.0 heads it will always be inferior to a 3.5 block and heads

My point comes down to money spent a 3.0 that beats a 3.5 in the power and powerband department will be much more costly.

prove that wrong and i will swap to a 3.0

JClaw

iTrader: (17)

If you are willing to destroke for revs using all stock stuff the way to go is:

FULL VQ35 minus crank and rods
VQ30DET crank and rods

Although if you do this theres no reason NOT to boost it.

Alex_V

The only reason why I wanted 3L heads is because I have them already, and I just thought when pushing high rpm, the 11:1 comp would be more beneficial then flow. And with porting it could work well/ or better then VQ35 heads and low compression. I do realize I need high flow too, but not knowing a value of the 3.5L flow X CFM more I cant really make a good guess on that. (Edit- now I realize thats not true, and flow is more important. but if ported 3L is close enough, and with the ITB's it should flow great....)

If I was going full NA Id invest in some 13:1 or so CR pistons and go a little more extreme. But Im going to boost it eventually so thats not an option.

Could I reuse a VQ35 HG? They are metal right? Im thinking of building the VQ32, then porting the 3L heads, tuning, dyno, then put on the stock VQ35 heads, tune and dyno and see how it does.

With all my other parts I think it'd be interesting to say the least. And after I pull the VQ30 heads maybe Id send them to the guy at full race and get them cut in half and see what they look like.

While Im NA I plan on fabbing some long tube headers and a 00VI modded or a ITB setup all with meagsquirt. I just need to see what parts would be best for the upper rpm's Im going for.

~Alex

nismology

iTrader: (8)

What logical basis does this have?
Says who?
Reusing a HG is flat out suicide.

Broaner

iTrader: (10)

Why you guys gotta hate all the time? Everyone can research and determine on their own without being bashed. I agree that the 35 heads are superior in flow and detonation supression but there was a time when I wanted to stick with the 30's for ease of installation. But now I've realized. Does that mean I feel inclined to bash everyone that still wants to experiment for themselves?

Hoooper

this is just flat out wrong, what you need most at high RPMs is flow, lots and lots of flow make it better for high revving. havent you ever heard of an engine "running out of breath"? thats from too low of flow, not low compression

Alex_V

Right then I edited it. I know flow is more important then CR. With some porting and ITB's it should bump up the flow alot though. Got to consider the heads and intake manifold(s) as a package.

So you guys say the 3L heads don't flow great compared to the 3.5L heads. But they obviously out flow the VG and VE, and do the VQ30 heads have good potential to flow good as well or what? I mean the 3L can make some decent power as is unported but whats really holding back the flow? Can some one actually give a reason instead of they suck?

The plan so far is ported 3L heads, ebay 3.5L cams, and some super short ITB's. 3.2L bottom end.

The only variable is the heads. If the 3L heads can be ported/valves over sized to flow well then that would be the way to go. But would it still make decent power with a 9:1 comp 3.5L heads vs the 10.5:1+ of the 3L heads.

Cliffs: Whats the potential of the 3L heads vs the 3.5L heads, and how badly would power drop from CR going from ~11:1 to 9:1

~Alex