Going over some ideas with my shop foreman at work today. An idea that we are putting together is swapping the well know vq40de from the xterra, pathfinder,frontier, all that good stuff. Take the 07-08 heads, and put em on there. Some sweet configuration although I am sure someone has already done this!

 

Title is a question.

Post is a statement.

What’s the purpose of the words?

Are you asking if someone has done it?

Are you asking if you should do it?

Or are you just stating it the way the title and post read? Which would explain why I’m the only one responding.

 

Wow...now I know when I am never on this board, and on driver instead.

 

sounds like a project best performed at Performance Factory. Hes done som sick work over the last few years.

 

lots of math involved to see if this would even work...you'll need the assistance of a good shop for it. Post some info if you do it

 

hey man don't get drawn to useless comments on this board. most of the people here are actually helpful. you just got to get out there and meet them. not the ones who dwells and hide behind their computer.....
anyways back to the topic. i think that would be interesting and it would be great to see it work. alot researching to be done but still i think it would be worth it. post up some info as you guys go along with the build

 

and post some pics, just incase you guys decide to go with the build

 

I heard the Vq40's have better heads than regular VQ35's. Infact, Supposedly altima SE-R's had the VQ40's head on the VQ35, which helped with the HP jump over the standard 3.5SE.

Anyhow, why do you want a truck motor, and a low redline, and less power?

 

you have a links that states those comments ?

 

The heads aren't any "better" than the standard VQ35's. They just used softer valve springs. Ditto A34 maxima and newer pre-07 murano/quest.

Factory redline is just that, a factory limitation. There are ways around these things. Besides, who's to say that the bottom end couldn't support higher revs and that the factory redline was just a reflection of the application?

Also, the VQ40 block has a better rod/stroke ratio than non-HR 3.5's as far as top-end power is concerned. The IM setup and cams are really what hold it back. It also has the stronger HR-style bottom end.

 

I'd have to search Altimas.net again, but again, those are claims, and nothing that I've personally seen.

 

The bottom end may be better, but I don't think you can say a longer stoke is better for higher RPM use.

 

The Rod to Stroke ratio is apparently better than that of a DE because the Vq40's use the same taller deck that the HR's do. That generally equates to better performance at higher RPM's but you are moving more mass around a larger radius (more moment of inertia) so there is a point where it can become too much. I don't know what that point is though.

I'm really curious what kind of RPM's the 92mm stroke crank can handle. A local shop has a VQ40DE crank modded for fitment in VQ35DE, that I'm debating using. The unfortunate thing is I won't have the taller decks so Rod:stroke ratio gets worse, but there are those stroker VQ35DE motors out there built to rev to 7500-8000 rpm depending on the actual stroke, so if the VQ40DE crank can handle 7500 RPM I may consider it.

 

The lower OEM specified RPM on the VQ40 is because the power drops off dramatically at those RPMs. That has to do with the cam design. Truck = stump pulling torque at ultra low RPM. Car = high HP at high RPM.

The bottom ends on the VQ40 should be fine for factory Z/G RPMs, and the VQ35 motors handle higher RPM just fine once you use different cams/springs that can net you any power up there. So if you're looking for stock Z/G rpm out of the VQ40, use aftermarket cams and go to town.

 

And manifold. Again, as he said, unless he's using the Taller block, he might have issues with the rod speeds at higher RPM. I didn't even remember that VQ40 had a the HR's taller block...

 

It's a good thing I never said that.

 

Shiner reporting for duty here. Nothing but a lurker seeking out power mods for the fronty, but I say go for it. Ive got a decent set of bolt-ons and an Uprev tune (#2 to get tuned ever! woo). She's putting down 245hp/260tq to the wheels on 87 octane tune (with the auto trany ) and running a 14.8 in the 1/4m in my 4500lbs 4x4 crew cab beast!! I'd like to see if this goes anywhere.

 

Because no one is over there?

 

+1

 

Sounds like an interesting mod, but don't you think the VQ37HR headers to be a better fit and work easier as that is designed more for a sports car than a truck?