Is it possible to get 400hp or so from a G without forced induction? and if so what do I need to do?

2004 Skyline 350GT 5AT DG/G Clears,Bats, Now wit Bumps in da back! [img]/w3timages/icons/shocked.gif[/img]

 

Since HP is torque multiplied by rpm ratio and the engine cannot produce much more than 270 lb/ft without Supercharging or nitrous on pump gasoline.

If you redesign the engine to move the torque peak rpm up and thus the HP peak up the numbers can coincide.

If you redesigned for a HP peak rpm of 9,700 rpm, if you switched to Methanol and increased the compression ratio maybe 9,100 rpm.

Unfortunate the V6 engine cannot tolerate this rpm [for long]even if you spent $100,000 on custom parts and engineering.

Calculate the torque drop [say 20% decline at new HP peak] 270 x 0.8= ~~216 divide that into desire HP: 400/216= 1.85185 multiply that by 5252 = 9,726 rpm yields rpm at which HP peak would need to occur to create 400 HP.

 

Umm or you could by the stroker kit.

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

^[img]/w3timages/icons/laugh.gif[/img]

Ivory Coupe 5AT
Z tube, K&N drop in.
Fujitsubo Catback

 

^^


Martin
2003.5 BS G35
Nismo Aero/Sport Package
0-60 5.4 - 1/4 Mile 14.16 *GTech* and on 19's!!

 

when mathematical engineering goes terribly wrong, lol! top secret produced a 450 hp all motor application two years ago. estimated cost...approximately $15-20K.

04 DG/G/6MT/Premium/Nav/Clear Bra
Bone Stock...to be continued...
"You kill mah brodah, now I kill you!" - some old kung-fu flick

 

Well of course if you stroke it out big enough, but V6 have too much natural vibration [V6 vs. V8 or V12] to survive high rpms for long.

To many people build one shot wonders that don't have oem durability. I assume once you spend serious money you don't want to rebuild every 6 months or 90 days.

 

The over 400hp stroker kit is used in FI applications a I understand it up to 1200hp or something. RPM's aren't going to 9k with a stroker kit I don't believe. It's just bigger displacement!

"To many people build one shot wonders that don't have oem durability. "

if you want oem quality 400 hp get a CTS-V. OEM 400 in a g will only come from a v-8 and it's all off point.

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

Nothing beats displacent from a reliability and low cost stand point........it was like pulling teeth for GM to build Northstar high efficiency small V8 to address the Lexus Infiniti challenge.......34 years and the push rod 5.7-5.65 liter [350/345 ci] V8 are still around.

HP to torque ratio tells the tale, ideally one wants them equal or the torque higher than the HP for extreme reliability [a new street car].

A 260/260 [3.5 liter] is nicely optimized.

Can you tell I'm biased to reliability [as an engine should last 300,000 miles]...........my 305 HP/337 lb/ft Q keeps on ticking after 14 years [267k] and still burns no oil [no smoke] and still performs as it did at 30,000 miles when ecu was reprogrammed for power increase. I have old dyno and recent dyno showing not 4% difference [less than 10 rear pound feet].

Nascar 650 HP that may not make it 500 miles or 3 hours is not my cup of tea...........building a 3.5 to Nascar type standards [obviously we can't use carbs and wide open exhaust on street] should easily hit 400 HP.

 

With respect to achieving reliable high performance, the old saying I heard was: It takes either high cubic inches or high cubic dollars.

'03 G35s 5AT, Garnet Fire/Willow
Staggered 18" SSR GT1/Bridgestone PP S03
Eibach Springs/Sways, Stillen 2-pc BBK
Stillen Intake & SS Cat-Back Dual Exhaust

 

If you have the duogh, everything is possible. I believe the VQ30 for 350Z in JGTC puts out 500 natural aspiratedly. That said, everything is possible, if you put your mind and money to it.

 

And stay away from textbooks

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

its possible, anythings possible.

you will probably need high octane fuel, jet fuel, 101 octane i think or 93 could do, but im not sure. there is a post on what to do already i think on 6mt.net, sorry to advertise for them, g35driver is much a much better forum.

all internal combustion engines work on the same principles, more gas+more are+more compression= more power

things i would do in order:
1. cold air/short ram intake.
2. re-do the entire exhaust: headers, high flow/no cats, h/x pipe and performance muffler. EVERYTHING TITANIUM!(if you can afford it)
2. new plenum, i havent researched, but aftermarket ones are better
3. this step will probably cost the most, the stroker kit. new pistons(forger, ceramic, i forgot whats best its been a while since my last auto class) new rods, whatevers best. lighter but stronger crank. Make sure when u pump up the compression you reinforce everything(the cylinders, the pistons, the rodsm the crank, and the head.
4. bigger more powerful injectors/ highflow fuel pump
5. lighter flywheel
i guess that is pretty much it.

little things you can do to gain hp i forgot to mention:
grounding kit
lighter pulleys
get rid of your ac compressor.


i know this is not organized or in anhy proper order, but this should bring you car to above 400 hp for sure

 

I think for the money it would cost to bring the VQ35DE to 400hp, you might as well go with a domestic V8 engine swap. The car would probably more reliable that way as well. Look at what Dodge and GM are doing with their hi-power engines. Viper V10 in a truck? Corvette V8 in a sedan? Too bad Nissan doesn't have a 400hp V8.

Last point, I don't see why not use a bolt on Supercharger.... Modern SC are very reliable and produce linear power with flat torque with minimal low rpm power robbing. A Stillen supercharger with 3 year engine warranty can easily give you 400hp at crank without breaking a sweat. The torque characteristics of the Stillen makes it behave like a NA V8. IMO that's the best solution for now.

Now all we need is a decent looking hood or a revised S/C from Stillen without the ridiculous hood...


CPV35 G35C Maliblue

 

its TT

04 DG/G/6MT/Premium/Nav/Clear Bra
Bone Stock...to be continued...
"You kill mah brodah, now I kill you!" - some old kung-fu flick