Hi guys,

New to the forum and from the land down-under. Been reading this forum like mad for the last 2 weeks or so to try and get my knowledge of VQ's up to RB's which are my bread and butter.
Heaps of info and its been great reading and learning. However i've hit an impasse and need some input. Ive written to Shariif at Forged but no answer yet.

I was about to rebuild an RB26 for my time attack S13 but VQ peaked my interest. So i had all but decided to use a DE but the HR with its' variable exhaust timing is very appealing along with the twin TB's make packaging much simpler.

The VQ is only in the 350Z over here and they aren't really that plentiful. My mechanic/tuner hence has only fitted and tuned 1 TT kit. So his knowledge base on the block just isn't there like it is with RB's. In fact there would only be a couple of places in Australia that may have rebuild a NA DE.

My question is this- i'll be using a Greddy TT 18g' but would like some input on after market bits. Engine output is small compared to most on here 460-500rwhp but it seems there ALOT less for the HR like bearing for example.

Would you stick with standard top end- springs valves cams or change it for the aboue power level?

The cams on offer seem very large duration for something that only revs to 70-7.5k and the dyno graphs all seem to start at 3000 which doesn't really tell me what the response below that it like plus being loaded up at 3000 prior to the run doesn't really equate to real world conditions.

I've emailed Kyle at IPP and he's been helpful but only in a parts way. Also Dustin at Brian Crower but again just answers on parts availability.

Happy to take any input you have as you guys are the fonts of knowledge. Its not like i can make a simple phone call to ask...

Cheers
Simon

 

FYI, the revup version of the VQ35DE has variable exhaust timing.

 

fyi hr is gods n/a motor can make over 300 wheel hp in a 350z with basic bolt ons and a tune

 

lol gods motor!!! its good but not that good! But it is way better than a DE...

 

finally someone search!!!:thumb up: thought after all my years of reading someone would never search being a new comer but i finally got to see the day

 

if you have money to do heads, no reason not to. but it wont make that much difference on the power range you are looking at.

If parts arent readily available for that motor, i would be hesitant about using it for a race application.

Most shops are out this week with Tx2k12 goin on. I know forged is out there.

 

are you making a one off and using greddy manifolds and using 18g turbo's?
if your looking for 450-500 an HR would be your best bet and cheapest option you could do it on a stock block no problem.(they also have larger duration cams then the DE's in the stock form). aswell as a few other things coolant passages from head to head is better. they are a one piece main girdle.

the downside is aftermarket HR parts are not in abundance the only company that was making aftermarket headgaskets for it recently stopped

 

i think the oem head gaskets are good enough seeing how the de guys use them i believe

 

Why is the HR 'way better' than a DE? In articles I have read where they test examples of both cars on road courses, the results are negligible and almost a wash. I think I even read an article where the 350Z (DE) was even keeping yup with a 370 on a road course.

I have never seen a DE get blown away.

 

i just posted why.

(they also have larger duration cams then the DE's in the stock form). aswell as a few other things coolant passages from head to head is better. they are a one piece main girdle. stronger connecting rods from the factory. stock for stock they have 30 whp more from the factory

 

But they're still barely faster than a DE.

 

whats your point lol? no one is disputing that. they are just barely faster. they have stronger internals which can handle more torque in a stock form which is what the op is asking since he wants to boost a vq with twin 18g's and whats the better platform to do that. if he is aiming for 500 whp the HR would be the way to go he would save on machining and parts for the block since nothing would need replacing.

 

Really I have modded de vs stock hr Hr pulls 3+ cars

 

Junglefever: are you sure that the vq is only in 350z's down there? Because it was/is in a few other Nissan models.

 

Well that was my only point I guess. I'm also not disputing the more advanced engine design. I guess I was just disputing the subjective stance that the engine is 'way' better but still it's not that much faster. That's all.

 

Curious you ever run your 299.99999whp HR? What does it run/trap?

Real track dont give me GTECH or Iphone App times.

 

the engine is way better. but no stock for stock it isnt incredibly faster

 

Maybe I just had a problem withthe word 'way' being used. Totally.

 

Sorry I don't know yet only been running it with that set up since October haven't had a chance to get to a track the closest track is 5 hours away from me

 

Let us know if you ever run it.