^^ sounds like it.

 

I thought the GTR was going to be using the VQ38HR TT motor.
I'd still like to know how us DE owners can get a little more power out of car using HR parts be it off the the VQ35HR or the 37HR. Thank you.

 

I can say this for sure but when i was leaving the Nissan dealership before i moved to forged i had a class at the training center. I got to talking with the head instructor there. i was asking about the new 08 G Coupe and the motor and the features and what not. then i asked whats going in the GT-R. he shyed away a little like he knew exactly what it was. I said is it going to be that VQ37HR with twin turbos with the varible lift like the new 08 G-Coupe motor. but with better lower compression pistons and rods to handle the power. He didnt say much after that other than "I can't say its not and I can't it is." soo after all that. Im have say if its something different i will be very suprized.

VQ37HRTT is what im saying....

 

I really like that intake manifold.

 

what is the update?

 

Nice, very nice...

 

It's surprising to me how many people are surprised at the differences and changes made from the DE to the HR, since they were all documented well before the new engine's release. JWT even did a tear down to inspect the rods and pistons, measured the intake tracts and runner length, and posted it all online. But it seems people missd it. Maybe not a lot of people are on the Fresh Alloy forums or saw the old NissanPerformanceMag sites where this was all posted. Therefore, I think a sticky needs to be made from this for this site. Otherwise, we'll have the same questions posted every week about transplanting parts and what's been changed between the two engines.

I love the new bed plate on the bottom end. This should make fabricating a dry sump system much easier and allow the engine to sit lower. The HR already sits slightly lower than the DE, but I bet there's at least another half an inch it can come down with the lower pan gone.

The larger main and rod journals will be nice too. According to Mike Kojima's inspection on the HR back in September, the rods are forged and much beefier than the DE's stock rods. Can you guys confirm this?

The assymetrical pistons are nice, but the top piston dome is not much different than the DE. However, the pistons come with an anti-friction coating from the factory and the top ring lands are hard anodized. All are good improvements over the DE.

The heads have a combustion chamber similiar to the Nismo RZZ heads and VQ30 heads, with quench areas on either side. Are you aware of the benefits these quench pads have? Also, from your pics, it looks like the stock HR head can really use some machining of the intake side to sharpen the intake valve divider. It looks almost square from the pics. Some room for power there, I'm sure.

Can you guys confirm the valve spring buckets will fit in a DE? The DLC surface is supposed to be great for friction reduction, and if cams are being swapped in a DE, then re-shimming them with the new HR buckets would be a nice upgrade.

The injectors are supposed to have an iridium center electrode to eliminate fouling on cold-starts and a newer 50 micron droplet pattern. From what I understand, these were developed for the new GT-R and other turbocharged engines by Bosch to help these engines maintain good cold start and clean idle characteristics. Any idea on what they flow and whether they are swappable in the DE?

Will
Pics of the rod (you can see the forge line), piston (you can see the anti-friction side coatings), injector, and intake measures by JWT:

 

One more question, will the rear head cooling passage fit on a DE? I like the design but I wonder if it will bolt to the DE head and if that center tube will fit below the lower manifold on a DE like it does on the HR.
Will

 

Hi Will, thanks for the comments. I dont have many answers to your questions just yet. I can tell you that the cooling bypass system will not work, since the timing cover has been redesigned to accomodate the coolant filler....which is no longer located on the rad.

When we get a chance, we will check if the lifters fit the DE. In regards to the rods, the DE rods are also forged, but are just wimpy. As you mentioned, the HR pistons look very simliar in construction to the DE. Looks can be deceiving, and some cast materials can be just as strong is a low end forging. So untilpeople start pushing some boost, through these engines, its too early to tell how it will hold up. No doubt, my gut tells me this is a much stronger engine...but my gut has been wrong before!

 

I knew the DE rods were forged but wimpy, but there was some rumor that the HR rods, while larger, were cast pieces. The rods look larger, beefier, than the DE rods... but I haven't seen either in person- but I'm sure you'll let us know when you have a chance to pull them out

I'm not too interested in using the coolant pipe or radiator cap housing, just the rear transfer piece. I can connect my own pipe and rout it through the front cover space. I know the HR has a larger passage for this, but I've just got a one-off idea for something. Will the rear piece physically bolt to the DE heads I'm wondering?

Those DLC buckets are the other piece I'm really curious about using in the DE.

The injectors, if they flow enough, might be a good deal for the mildly done FI crowd if, in fact, they are designed for better cold starts and cleaner idle with turbocharging in mind. I understand it's one of the components that attribute to the SULEV rating.

Thanks for the write-up so far Sharif and to the other guys at Forged. I still say a mod should sticky this.
Will

 

On a small side note, does anyone have a direct side by side comparison of the rev-up and non-rev-up rods?
Keep up the good work Sharif, and let us know all the goodies going on in there.

 

I think they were the same except for the rod bolts, not completely sure though.

 

That is my understanding as well. According to the Nissan press release on the 300hp rev-up engines, only upgrading the rod bolts for higher rpm use are mentioned, not all new rods.
Will

 

Ok, cheers!

 

not to mention the steering knuckly is much larger and the header won't fit on without being notched in he area around the knuckle

 

My contribution, not much but for those who will install mechanical 02 sensors made from antifouler plugs... they wont fit because the 02 sensor tip is thicker. dont know if its a different 02 sensor in all or what

 

So here is the real question. Are you Sharif and gang willing to go through this all over again comparing the new VQ37HR to the VQ35HR and the VQ35DE?

 

Sure, send us a car.

 

I bet there will never be serious mods for the VQ35HR since it appears to be short lived, the VQ37VHR is a superior engine. Anyone know how long the VQ35HR will be around and in what cars? The G35 is changing to the G37, but will the 350z keep the 3.5? The complete control of the valves in the 3.7 is awesome technology, if an ecu gets made for it, electronic cam changes are a tune away.

 

I think the Z will eventually move up to the 3.7l or maybe even the 3.8l. Notice that Nissan, the last couple of years, has referred to it only as the "Z".