rory

how can i do that and what else would i need to make it reliable. its just a question please dont flame me.


thanks rory

Wired 24/7

iTrader: (2)

FYI, horsepower drops off at / theoretically above redline.

ECU reflash will let you go up to 7100 or so I believe.

GY-Z

assume you have power at those rpm range, you'll AT LEAST need rod bolts, con-rod, high strenght spring valve, a high rpm use crankshaft, and a fully built enigne(i.e. forged internal) that can take the stress.
this are the parts i can think off, feel free to add any

JeffesonM

why would you want to do that?

rory

its so tempting i see a big rpm gage and only do 6600. but i will try a reflash at 7100 and see if that helps.

nearly zer0

iTrader: (1)

our engine style just isn't made to work that well above a certain rpm. though any engine i've heard sounds wonderful a 8krpm, even hondas. so i'm sure our vq would be a symphony at that rpm.

it would require a completely built engine as previously posted. probably talking about 10k worth of parts and labour, not to mention not quite streetable afterwards i would imagine.

Bran_BranZ33

buy an S2000....

Sharif@Forged

iTrader: (92)

The mechanics of this motor...bore/stroke.dimension....do it lend itself to continous high RPM operation. As mentioned, its highly unlikely you will make anymore power beyond 7000rpm, and essentially, you would need a fully built motor, and a full Ferrea valve train....completely built head. Very Very expensive, and not worth it, IMHO. You can get away with 7000-7500rpm operation with valve springs, retainers.

But honestly, the inertial loads on the roads, rod bolts, etc....rise exponentially as RPM increase. You are looking at a 100% increase in inertial loads between 6500rpm and 8000rpm. Too much risk of engine failure, IMHO......at least for a street car.

I have my limit set at 7100rpm via TS reflash, and I always shift around 6500-6800 anyways.

ZIABLO

iTrader: (7)

Yea, my dyno shows a flatline after redline.

UsafaRice

[QUOTE=gq_626]As mentioned, its highly unlikely you will make anymore power beyond 7000rpm[\QUOTE]

I will agree with this, but the thing does scream on juice when you go there. It's a whole different noise. But honestly, if someone just had the cams cut for performance up top, people could see drastic increases in power and track times. I G-tech my car and I see that it makes peak torque in a region I never see once I'm out of 1st (3,500-5,000). I'm spending all my time from 5,000-7,200 where I get the gear ratio to give me the acceleration. Just shift the powerband up 2,000 RPM, add a turbo, and go.

krismax

I have video on the net of my vq30 block toatally stock revving to 8k . Now with my vq35 i have had that up to 8k 2-3 times and have seen 7600-7750 prob 50 times so far . the mods my vq 35 has internally are ARP rod bolts and JWT valve springs.

And by the way it pulls very hard even past 7500rpm

sasuke

iTrader: (18)

it's not a VQ engine, but this is a vid of my previous s/c rsx revving to 8900rpm on stock internals.

http://www.we-todd-did-racing.com/we...ZmQzMXk1NDE%3D

Dave B

iTrader: (2)

Too many guys have Honda on the brain. Revving to high rpms doesn't necessarily constitute more power. If that was the case, then the 350-500hp LS series V8s from GM would rev to 8000rpms+ and not the 6500-7000rpms it's limited too.

The VQ35 in the 03/04 G/Z is not a high rev motor. Instead, it's a rather large displacement V6 capable of decent RPMs and has a very linear and fat powerband WHICH IS WHAT YOU WANT!! The VQ35's powerband is from ~4800rpms to 6500rpms with over 95% of it's torque available by 2500rpms. That's impressive. Revving a VQ35 past 7000rpms is unnecessary. It will make you slower and you'll risk engine failure. The goal to a strong accelerating car is to stay in a linear and fat powerband If you rev too high, you fall out of the powerband therefore you're slower. Overshooting the powerband is just as bad as undershooting the powerband (ie short shifting).

The VQ35 was never designed to be a high rev motor. Have you guys seen the lengths Nissan went just to extract an extra 400rpms in the 300hp 05 motor? The block, rods, and valvetrain were redesigned so that reliability would not be compromised by just that extra 400rpm of rev (7000rpm limiter). Now think about that for a moment. Are you guys really certain a 03/04 VQ35 with the 6600rpm limiter would be happy living life above 7000rpms? I sure as heck don't. My last car (96 Maxima) had the VQ30 and I had a JWT ECU which raised the limiter from 6500rpms to 7000rpms. Even 7200rpms most likely would have been safe. Why? The VQ30 has a much lower piston speed than the VQ35. The VQ35 has .5" longer rods. The VQ30 already had weak rods and the VQ35's rod are .5" longer and are MUCH weaker. That's the very reason the VQ35 is a poor motor SC or turbo. It's also the reason Nissan is using a slightly bored out VQ30 instead using the deep stroked VQ35 in their Z racecars and in the upcoming GT-R. Nissan realized the VQ35 isn't up to the task of boost.

In order to be able to rev a VQ35 to 8,000rpms and make power to 7500-800rpms, you will need to do the following:

1) New rods and hardware
2) The 05 300hp block and valve train
3) Different cams designed to push the powerband from 4800-6500rpms to 5500rpms-7500rpms or so. This is critical for power production.
4) Upgraded oil pump to handle the stress of 8000rpms
5) Revised upper and lower intake manifold designed to increase airflow at 5500-7500rpms.

In the end, you'll have a VQ35 that's a complete dog below 5000rpms and then comes to life with frenzy of power.

Wired 24/7

iTrader: (2)

Broken link, yo.

sasuke

iTrader: (18)

looks like the server is down.

temporary link

http://s40.yousendit.com/d.aspx?id=2...S3PF6O9FIOUQAS

Wired 24/7

iTrader: (2)

Interesting...doesn't sound as mean as I thought.

Nano

iTrader: (1)

the Z will safely and easily produce power up to 7000 rpm with basic bolt-ons. (the track already does so with basically just rod-bolts).

8000 rpm is another order of magnitude, it will require a major overhaul.

Skrill

Just so you know -- I have seen a dyno plot of a rev-up G35 engine (the 298hp one) with a rev limiter reset to 7600. The car made good power up to 7400. But then dropped bad.

thawk408

iTrader: (16)

I thought they did not have a flash for the 05 yet?

atar350

I think our cars rev great stock, reflash to 7100 is awesome, I think the most we would need is that. Why have a larger powerband if you really arent making power, and why spend bank on rebuilding engine to rev past 8K, when you can turbo the car, rev to 7100rpm and make FAT POWER. I just dont think it worth the money.... I would buy a turbo kit, forged internals, and reflash. IMO.