Ok guys, from reading this forum, It seems therse are the facts.

The 2003-2004 model motors were non rev up type producing like 287HP.
The 2005 and 2006 model years uses the higher reving motor producing 300HP.
The 2007 and 2008 used a 307HP but with slighlty less torque, not sure if its a Rev up motor or not.
My question is this, just exaclty what is the internal differences in the motors from 03-08 that are responsible for this increase in RPM red line and overall increases in HP.
Common sense would dictate that it might be Throttle body size increase, Caming, changes in the ECU, chaanges to the intake etc etc.
But we should be able to identify these changes and then hopefully incorperate some of them into the old motors.
ALso I was told today, there was a problem with the older motors, 03-04 in the rod bearing area. It seem there is a stretching of the rod or main bearing bolts??
Anyone have any input on any of these points? Thanks, Mike

 

Well this topic has been beaten to death on this board multiple times, a quick search would have found quite a bit of what you're asking.

However, you've got the "2005 and 2006 model years" engine wrong -- in 2005, only the 35AE with 6MT and the Track model got the 300 HP "RevUp" engine, all others in 2005 got the 287HP engine.

2007+ 350Z have the HR engine -- it's not a "RevUp."

The RevUp engine has variable exhaust valve timing, different ECU, different ABS computer, different wiring harness, different internals, different intake plenum. You can't simply turn a non-RevUp into a RevUp. Nor can you turn a non-HR into an HR (well, you can, if you have more money than brains, but then you're probably not looking at a 350Z at that point).

 

Thanks, good information. So let me ask you this, I have an 03 model If a guy had an oppurtunity to build a spare motor and then install it in his 03, would he be best off starting with a platform of the original 03-04 motor or,
a rev up motor, a 300HP motor or the newer HR motor?
thanks, Mike

 

VQ35DE is middle of the pack

VQ35DE-R has more HP, less TQ, also have to watch for oil consumption

VQ35HR Has more HP, slightly less TQ, much better engine. Also has dual intake.

HR is the best engine in these cars IMO

 

I don't understand why people under estimate the rev up. But anyway lets not forget that when put on the dyno it goes hr>revup>de. The de is the weakest of them all but the fact that the 06 cars weigh nearly 200 lbs more almost makes them equal. But when it comes to power adders a revup is going to see better gains than de. But to answer the question I'd put whatever engine in that came out. Too much of a wiring hassle. I don't know for sure but I don't think it's easy to wire up that exhaust valve timing of the revup nor the wiring or etc with the hr.

 

the de is funner to FI or in build engine form
sounds like OP is going to mod...and he should go for whatever has more aftermarket parts too...

 

Thanks to all of you for contributing to this. This is all invaluable info for some of the newer people on board like myslef.
Sounds like using the same engine that came out of my car will make the most sense to avoid electrical hook up issues BUT, in buying a car and selecting a model, this info is way important and since I cant seem to keep one car very long, the info will be most useful to me.
thanks, again, mike

 

sorry idk if im getting this right...i have a 2006 6MT...do i have rev up? haha sorry

 

Yes.

 

so when the dealer replaces the revup engine for consumption are they addressing the issue in the new motor?

 

As far as I've read, the problem was with the oil rings -- some were not up to spec and would allow oil past the ring and into the cylinder where it would be burned.

The new parts are (supposed to be) up to spec -- and not all of the old parts were out of spec.

 

sorry i'm total noob and looking for AT atm. so 05-06 AT won't have oil burning issue?

 

Anybody know the amount of torque a fi-de can handle?

 

I've heard 400 lbs/ft is the cut off point.

 

no, as far as i know they dont make the AT as the rev-up you get the ordinary DE all the way through, the 370's probably changed that though and probably offer the HR as AT

 

 

just clarifying for the n00b...

 

Which noob are we talking about? What do you mean that 370s "probably offer the HR as AT"?....

 

only because most of the motors came from Europe. the gas and oils they use are slightly different in the states, and our liquids just ate through the rings...

Nissan need a motor between the 05 de and the 07 hr... the DE by that time was becoming weak at higher miles and some where developing knock issues. the 06 de-R was sourced out of a supercharged Renault vehicle.

the internals are high strength. not forged. when you see that the HR has a 80% part change from the DE, the head deck is and intake manifold are all new parts, and the internals are all high strength materials.

as for the 400lbft limit it's the rods... they tend to snap at about 400lb-ft... that's why... unless the block is modified getting past that is going to be difficult to call it safe and reliable. however running a 150shot the motor rev up can hang...

 

I know the oem rods are the weakest point in a stock de...

Just wondering the point where the block would crack under pressure