Cheers to everyone input though!

Yeah I started to look into building a 400 hp VQ. Way too many limitations with VQ heads. And stockish VQ internals aren't up to RPMs you'd need to turn to get to 400. No reasonable way to get there on pump gas in my opinion.

Not an easy road to 400 plus but the HR head race motors are mostly all cranking out over 400. Just takes a lot of work from internals, to cooling and oiling systems, to intakes, to exhaust and engine controls.

And ultimately that 400 hp NA isn't going to be too street friendly

Think low pressure forced induction is way to go for a street car.

On that note, did anyone ever develop a roots or twin-screw blower for this motor? I thought there was one for the G37, but I've never been able to track it down -- possibly a one off.

I know the lack of standard throttle plates is supposed to be the main problem, but I don't wee why a clutch type engagement wouldn't get around that.

Massive low speed torque off idle with a table top like curve and a somewhat more modest top end would make for a fantastic street friendly beast.

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cool article on the VQ motor on what it would take to reach 400hp on the VQ motor.

P.S. once in the website, while its loading hit the stop button or it will take you to an ebony hair product website

Bringing back this old thread. Producing 400 N/A whp on a stock block isn't to far fetched after all. With my original thought of keeping the cost under 10K isn't possible with all of custom or 1 0ff parts having to be purchased. Thanks to 1slow370z for pushing the envelope, guess time will tell how far the stock block. Lets see if the motor can spin 9,000 RPM's and make 400whp.

No one said its impossible. Previous gen F1 engines made 700+bhp out of a naturally aspirated 2.4L engine. It's just a matter a budget really.

To rev that high it would still need a lot more work -- now we're talking stock block with all new reciprocating parts, different valve train. Look how much went into 1slow's build, and that's without touching the valves (EDIT: although he did swap out the exhaust cam --I forgot about that!) or the rods, pistons, etc.

So yes, everything 1slow did PLUS open the engine, replace with completely different internals, custom valvetrain (more complex due to VVEL), run E85 or very high AKI petrol etc. This is pretty much what was said previously, tho'...

Honestly, if you really want a Z that could be a monster off the line, with 400+whp, and a table top flat torque curve starting off idle, no high rev's or dry sump needed, someone needs to figure out how to make a roots or twin-screw blower work.

If that could be sorted out, it would feel like a N/A V8 and absolutely be a DD beast -- note all the roots blown pony cars and how fast they are...

We've seen great results with TT's and centrifugal blowers, but there's a reason why OEM's use roots type S/C's for their road cars -- it makes the engine perform like a larger version of itself -- no lag, just immediate torque.

You'd need (I think), a clutch type engagement roots or twin-screw blower, a new IM, maybe with laminova A2W coolers (or W/M inj.), probably a different hood, and a tune -- DONE. No high revs or complete overhauls needed, and almost certainly OEM cam.

Throw in headers (bigger primary shorts or LTH's) and it would be a monster. The peak torque and power levels might be kept more modest relative to turbine-type blowers to preserve things like weaker high gears on the AT, but whether AT or MT, it would feel like you stuffed a 5.0 in there when you hit the gas.

F1 motors have a crazy short stroke, have no valve springs and rev 18,000 rpms. Let along the cost.

There's your answer. Destroke, drysump, supporting head mods and you're set.

yeah except you don't need to destroke nor do you need anything in the heads other than stiffer springs and cams.

External oil pump, better rods, valvesprings and cams, better manifolds = 400whp

There a guy making 436hp on NA built

Who?

Yeah ^^^This^^^ and is it a stroker motor?

he's saying the crank hp of the 371whp world record build. even tho with 15% drivetrain loss thats only 426...

well my cars ACTUAL drivetrain loss was 16% as measured by the dyno. 286/332 so 430 but it actually made more because the graph cuts off at 8200rpm

Just to put it out there that the grand am cars are around 420wheel with HR heads at 9500rpm

black dragon maybe?

I see it on 370z facebook page. For sale and it belong to 1slowz

'1slow370. That what i mean.

WHo is making 436 to the wheels?

Not sure it 43*hp to the wheel, bc i havent read the whole thread, but you can check out 1slow370's journal

He's referring to you :tiphat:

Yup, you should around 430 bhp on an engine dyno :eek:

I know and now its on ebay so awesome fml i need to sell it and pick up like a mazda 2 or something.

Why couldn't you do this 12 months ago!!!

I've seen this so many times. Someone does a build-up. Dump a ton of money into it. Then turn around and sell it. Can never figure out why someone would do this. :icon14:

CHange of heart? Change of Financial situation? tired of working 40+hours a week and having nothing but a car to show for it? depreciation is a bitch? there are a lot of reasons, at least i got one of my goals accomplished before i sell and can feel proud of building something unique and let the next guy push the limits on it.

Well start selling cocaine have tons of money to spare and have a beast of a 370 lol

That itch for tuning your car will never leave you, so you mind as well suck it up and keep the car the way it is for now and just start saving money for other things in your life.

400whp from a NA 3.7 liter would require like 125hp per liter at the crank (rough estimate). Think about that. That's Ferrari 458/ Porsche gt3 RS 4.0 type of efficiency...aka the biggest non FI hp per liter cars out there from any manufacturer. You'd be looking at alot of work and very high rev's. I'd say at least 9-9500 rpm. The higher revs alone would require alot of work, let alone making the engine breathe the way it should at 9500 rpm. Is it possible? sure, but it'll cost ya.

If our engines with supporting hardware can spin 9k +, what about the drive train? I would worry about the bearings, drive shaft and tranny. Plus the engine accessories.

All valid concerns. It would take R+D to figure out what can hold up and what can't. Throw that into the budget as well. I'd say for starters balancing the entire rotating assembly with a an extremely light flywheel and clutch attached would be important.

Awesome words bro, the accesories are fine unless you are going racing, and then you would want to switch to a lightweight racing alternator anyway, the a/c usually has to die to fit the oil pump, and the ps pump is fine, the drive shaft and rear are fine, the trans is just as crappy as it is now but it doesn't implode or anything, and what you really need to do is get aftermarket rods, a slight bump to the valve spring, balance it, run the 282 duration cams, and have good manifolds intake exhaust. I wish there was a dyna pack near me so i could throw down 400+ just like the other NA builds and call it a day.

If you want to know what that level of NA power feels like just buy my car.

You will regret selling it, just keep it. Ask me how I know.

It unfortunately must get sold

Not familiar with these acronyms
 

What are DE and HR heads?

Sell it.

You can (and probably will) do another car project in the future.

If its gone from labor of love to a money pit, time to sell.

I diagnose investor fatigue ............. it happens.

Vq35de head = garbage from the first 350z's hr heads=vhr heads without vvel

Cars are not good investments eeveryone knows that, I just dont want to live around my car anymore it much more enjoyable when you don't have to worry about wether to take a vacation or get a bbk

Sell mary jane!!!

You live in cali