complete engine overhaul questions.

Rooskey

I can kinda understand where the op is coming from. I use to deal in older muscle cars my self, so yes it would come across as simple. Yes we do have the technology to add big cubic inches and intake runners and valves and such, but the technology on the ecu and vvel is not there. Think about it though. If we can make almost 350 rwhp with bolt ons why couldnt we make almost 500 with 4.5 liter stroker. I believe that we could if there was a way to get more air to the engine via the intake side of things. If we cant change the vvel or the cam the only other thing that could be changed would be the essentric part of the valve train (part of valve train that actually makes contact with the valve steem). With new pistons, clearance wouldnt be a problem and you could controll the duration and lift with one single part. Once again it would cost alot just to test out a theory.

FL 4Motion

I just don't see 500whp coming out of an n/a 370z, regardless of what's done to the motor (assuming it's still the original modded motor, not an lsx swap etc). I think it's a question of diminishing returns to certain extent, increasing the displacement should, in theory gain hp, but beyond a certain point, not so much as to even make the effort ($$$) even remotely worth it.

In short, I can see 400whp with a stroked and massaged vq37 (n/a build) happening at some point but not more than that, def not more on pump gas.

chii370

How is it so inconceivable, I see mags and shows on tv for example "top gear" that feature cars like a WRX, an EVO, or a RX7 or any of those cars ALL of which have a much smaller displacement engine, and in the case of the top gear pep it was a 1000 HP EVO 8 I believe. YES I understand that's AFTER it was turboed, but you expect me to believe that the turbo alone is producing 600 of those horses? U have to be about retarded. And then say a motor that's ALMOST double it's size can't make half of that on it's own? It doesn't take much. Mine dinoed at 368 FWHP bone stock. Bolt on stuff ALONE would get it close to 380-390 if I did all bolt ons available. Just puting a good pair of heads on an engine helps dramatically. Or at least it does with a old V8. and guess what? It's the same dame thing, minus 2 cylinders.

I think that vvel **** would probably be a tuning issue and would probably have to be worked around entirely IMO but all it really is, is an electronicly "ecu" operated and timed variable opening and closing of the valves. regardless of cam lobe being more aggressive "because thats the difference in a race cam" and keeping the valves open longer or opening them faster its just a matter of tuning the rest of the system to accept the new variables and tolerances . but other then that this is clearly a hypothetical question as it stands. And who cares what it costs? I'm asking if it can be done and if anyone has a real professional opinion about it, not your opinion on financing. My situation is simply time sensitive, and if you must know I'm going army special forces next may. But paying for the car UNTIL then is the issue, not after.

I didn't say I don't know how a transmission works or a clutch or anything else, I told you I'm old school muscle car. Have a question about a torqueflight trany? How about a ford 9in rear? Or whether you can put 351 windser heads on a 302 "Aka boss" then Im the man to ask. But if you ask me about all this new ****? viscis rears, quad disk dampened clutches and all this other ********? No I DONT know much about it. It's called learning, so how about a little respect and not insta flame someone because they may not know something you do? How about trying a nifty technique called teaching.

I see no reason to even doubt it can be done, I simply asked if anyone knew how.... And where to aquire the parts to do it. It's not like I can just call up JEGS or summit, for some reason the Japanese car tuner market feels it needs to be far more exclusive and complicated to work on these prissy picky *** cars. It's like babysitting an autistic child trying to work on these things.

Did u ever think that maybe I was ok with investing time and money into trying to figure it Out like a true mechanic rather then be a ******* instant gratification whore and go the easiest route possible because of any lack of real knowledge? Aka turbo solution. Most people talk big, but don't actually know what it really takes to build a race engine. Not just a stock engine that's blown, procharged or turboed.

chii370

So in a nut shell, what I'm hearing is that you think you can't gain 100-150 more horse out of heads, pistons, cam, crank, bore, intake, fuel system. Doing the SAME thing to an old v8 of any kind doesn't matter, that say... Made 330hp from the factory, like an old 383 or a 440. using a CARB and running on 93 pump gas you can easily build one that makes 750-775hp . I should know, I have a 1974 AMC hornet with a 401 bored 10 over that puts 800 on the ground. it runs low 9s. And thats on a road legal cheater slick, cars not tubed, full interior, all original sheet metal. So it just so happens I know my way around a performance engine or two, but not the new stuff. If you want pix I will upload a few, I know how people tend not to believe each other behind a vale of anonymity.

http://s1222.photobucket.com/albums/...t=IMG_0574.jpg

http://s1222.photobucket.com/albums/...t=IMG_0573.jpg

sorry about the quality, an ipod isnt the best for taking pics

(self correction, since this car doesnt have what you could conciser a traditional camshaft with lobes, i take back that statement. ) but from what i gather on how the VVEL works with the opposing rocker arms in place of lobes and stuff its all down to tuning. im sure theres tolerance limits to the stock system but from what i see it has potential to be FAR more versatile then having to swap in a cam thats physically different. its all operated and changed on the fly by the computer for the opening and closing duration and speed. thats some seriously complex stuff right there, but just like everything else it can be replicated and designed to be more performance oriented.

Red__Zed

Turbos work by cramming more air into the engine. You are dealing with an entirely different animal when you have FI. NA, it's a massive struggle to get to 100hp/l in many cars. When you are running 45 psi of boost on an FJ, you are dealing with an engine that can mix air and fuel like a 10L engine

Nothing has really changed since the old days. If you know old stuff, you know new stuff.
I think most people's negative reactions have been related to a perceived attitude, but there are plenty willing to share their knowledge if it is asked for politely (I will share whether you ask politely or not_

If you are down to do the work, get out and do it. No one on here has done it, no one here can pass you any advice. Get 'er done, then come spread the knowledge. I'll check out the build thread if there is one.