machsound

Heys guys,

Alright I just got a new job making almost double what I am making now. Good thing right. So I am going to have a little bit extra money now. I was wondering "what can I do to my engine to make more power and still be somewhat reliable." I was thinking about boaring out a vg30et motor, but my brother told me to go with a vg33 because they are just the same. I have read alot on the the motors by searching but im confused does the vg33 have dohc or not. Or do some do and some don't. I don't want to play around with this to much and drop tons and tons of $ into it. I have to save for my bike come spring.

Well what im asking is will it just be easyer to boar out a reg vg30et to a vg33et or to run the whole new engine. Anyone that can help would be great.
Kyle

machsound

No input from anyone. Thats good.

Well anyway I did a ton of searching and I found that the vg33et is made. So I am going to find myself a vg33et motor and rebuild it. Dish out the pistions and work over the head, go stand alone and everything else in the car and put about 400whp to the ground by the end of the winter!

I am also buying myself a winter car a mazda 323 Gtr. Its 4wd and 4 banger. Did I also mention that it is turbo, and weighs in at about 2800 lbs. That might be my car to fix up next winter.

So thanks for everyone help on this matter and I someone thinks I should do something while working on this that I might forget please tell me.

NismoPick

The reason no one posted anything is because that question "how can I get more power?" comes up all the time. The answer is the same everytime, so using the SEARCH will help tremendously. You learn the most when you do your own research... like you just said.

We are here to help, but the basic "how to get more power" can be found by searching the forum. YAY!

NismoPick

Oh, and where do you plan on getting a "VG33ET" ?

machsound

I don't plan on getting a vg33et I plan on making one. Hence dishing pistons and everything else. I guess I could also get a vg33ze. That might work out rather well also. Then I just have to deal with a super charger. I bet they are really hard to find though. I'll just pull one out of 95 or 2002 pathfinder, and do the work on it so I know it can handle the power.

I was asking which one would be more worth while doing. Not how to make more power. I know how to make more power. Ether higher displacement or more boost. I like more boost and higher displacment but thats me. Its cool though Zbum helps me out sometimes. Like that darn fuel temp sensor.

Thanks again. I'll post a dyno slip and track times come spring. Should be pretty good.

Comrade_Charlie

I have a 300zx turbo, im pretty much going to try to do the same thing. I take it you have a 300zx turbo, as you said "bore out a vg30et motor", one thing is that you cant bore that out much. a lot of off road nissan people make vg34's which is a vg33 block bored out to 3.4L with vg30 internals. you can use 1990s q45 pistons(I found some for 100bucks). that what Im going to do.

what transmision do you have? im sure you would blow a t5 with 400hp

Im going to rebuild my T5 to hold a lot of powerand buy a new clutch also a lot of money for one that holds 400hp. you can buy a vg33e block for around 200$(well I can around here atleast). but this is the easiest way I see to get a lot of power out of a vg30 without having 20psi on a t3/t4 turbo is to make a vg34et or just all motor. I plan on doing this when I get some bloody money. Oh and im sure you would need to reprogram your ecu and get bigger injectors... for a vg34et pushing 400hp ive estimated 3000 bucks but not sure as there is hidden costs in every thing but 3000 into a Nissan is much more than 3000 into a honda LOL I love it

here is a link to a nissan truck forums(which uses vg30 engines)
http://www.automotiveforums.com/t88513.html

I cant find the link but this is from az-zbums site I think LOL. its a good read about vg engines

"VGs are very much like L-series in that you can mix and match lots of parts. ALL North American VGs have the same stroke and they all have the same size bearing journals. I do not know about the VG20 found overseas. The VG30E block cannot be bored to use VG33 pistons, the cylinder walls are too thin. The magic formula to build a VG34 is this: Bore a VG33 block .060 over. Use *stock* 1995 Infiniti Q45 pistons, rings, and wrist pins. Use VG30ET rods with custom, larger I.D. small end bushings as the Q45 wrist pins are 1mm larger. You can use any SOHC VG crank (they are ALL cast), but there are differances in front snouts and related accessories so use one you've got all the parts for. Avoid any SOHC VG crank that's been run with a serpentine accesory belt as these tend to break off the crank snout! The above VG34 combination is the one used in the off road trucks. If I remember right this bottom end comes out to 10.5:1 compression, perfect for a street motor. Sly said a VG34 with "good" cams and stock heads will make 250hp on 93 octane in street-trim. With port work and the "right" cams and intake a VG34 can make 300hp on pump gas. Sly says that no matter what you do they won't make power over 6500rpm as the displacement is too big for the head design. The question I've never heard answered is what happens when you turbo a VG34? I don't know anyone that's done it so I don't know what the limit is. I'm guessing the crank will come apart first. I've been told by many that SOHC VG cranks are short lived when 350hp is exceeded. It is possible to use the forged DOHC crank in a SOHC block but it requires a custom flywheel and messing around with a few things to make it go together. It's relatively painless but I've only done one so far. If you are thinking about building any VG be warned that they are difficult and expensive just to rebuild stock. Many automotive machine shops cannot hold the tolerances neccesary to make a VG live, especially if it's warmed-over. Rebuild parts are also expensive, but then they should last 200k miles."

machsound

Thanks I have read almost all of z-bums pages. They are very very helpful. I also read somewhere else that the blocks are all the same that if you were to bore out a reg vg30 into a 33 it will have the same wall thickness. I'm can't really say that this is true or not because I have never compared the two. they do have the same outside though. Thats what I find so attractive about the engine is that I can just bolt it into the car.

You did give me a very good idea though. Instead of me getting an entire engine why not just get a vg33 block and work on that I have the heads and everything that will fit on it with my turbo engine now. I think this should be a rather cheap build for the power. I will start it sometime soon as soon as I get my other car/truck. Not 100% sure on what im getting now. something 4wd though.

As far as ecu, I am going to run stand alone (megasquirt or something like that) The tranny is a rebuild of the tranny that was in the car from factory. It has about 8-10k miles on it as of now. But im not sure what clutch im going to have to go with I can't find one that will hold that kind of power.

Comrade_Charlie

all over the place I read that if you bore out a vg30 to a 33 which is 3.3liters that the cylinder walls of the vg30 will be to thin. I hear it will bolt right up because they say "the outside is the same" im not sure how this is if it has .3 more liters and has enough room to go further... but for a vg34 engine you have to pay someone to put the pistons on the rods and balance the assemble or something like that so there is hidden costs... but I find it more rewarding than buying a whole nother engine.

I was thinking about megasquirt but I wanted to go cheaper and just get a romulator(I think thats how its spelled) and just reprogram the ecu.

but yea I would definatly not bore a vg30 to 3.3 liters...

What year car do you have?

wreckedj30

wouldn't it be easier to stroke it, out to like 3.4 and then bore it, making it like 3.6 or something. I don't know much aboot the vg motor, but would love to learn...i do know of the ford power and thats why i speak!

Comrade_Charlie

I have never seen any thing to stroke a vg motor... the only all motor thing I have seen is a vg34e. I have read it is very pricey to build up a vg30e for some weird reason... but im sure a vg34e can be made for 2 grand considering you have all the parts(3.4 pistons, vg33 block, and vg30 internals). I plan on making this but I have a turbo. I have yet to find a vg34et so... we shall see what happens if I ever get the funds and another car... currently the only car I have is the 300zx.

But most people just put a bigger turbo, up the boost, get a fuel manegmant system and call it a day... after they make their car able to handle the power... I see the easiest way is just to rebuild the transmission(if possible to make a T-5 to hold 400+). there are also a bunch of other stuff you have to do... the reason I want to make a vg34et is because im not a fan of a lot of PSI so I want around 400hp running stock(6.5) or 10psi on a t3 or a t3/t4 (the engine will be out why not go all out, of coarse the amount of air will be different on a t3/t4 running same boost...). I would say go with a v8 much easier to get 400hp but I want a sleeper and thats what these are. sunfires and civics talk trash about my car. I raced the sunfire and owned him at low rpms...

but here are 3 good sites...

www.vg30et.com (high hp turbos, click on members for fun)
www.88hybrid.com
and www.redz31.com

Oh and I just looked at your cardomain, I saw ur 86 turbo and left you a message.

machsound

I've just spent the last 2.5 hours looking over all more sites. 400 whp is going to be no problem at all with what im planning and i should be able to do it for less than 4k. This is going to be great I can't wait. I'm pretty sure I found a garage to keep it in while its getting worked on and I might also be able to work there on my days off.

O and we don't have the quest anymore. It was a fun car when it was running though.

Ps. If anyone has a 4wd for cheap let me know. I live in pa.

Comrade_Charlie

I have riden in a stock turbo conquest. that is one bad bad car... i would take a 400hp quest over a 400hp 300zx but id rather make a 300zx into a 400hp LOL

machsound

One of my friends brought this up yesterday. Its kind of hard to get .3 liters out of a bore. He said It might be stroked a little as is. Which would kind of make since if the block is all the same! Just a thought. If thats the case though they would be putting down higher tq numbers right.

Comrade_Charlie

well if you use an xterra block which is 3.3 liters, all you need to bore out is .1 more liters... and then use different pistons and I here all vg30 internals or vg33 w/e floats your boat. But I have never heard about stroking a vg

AZ-ZBum

Here is the page you got that from. I make no assertions as to it's validity or any claims to its accuracy. I merely saved it for posterity.

http://www.az-zbum.com/vg34.shtml

machsound

Ok I did some searching around and here is what I found out about the vg33e:

3275 cc
91.5 mm bore
83 mm stroke
8.9:1 Compression
Cast block & light alloy heads

168 hp at 4800 rpm and 193 ftlb at 2600 rpm

For those that don't know the vg30e/t engine here it is:

1960 cc
87 mm bore
83 mm stroke
9.0:1/7.8:1 compresion
Same block and heads

158hp at 4800 rpm 180 ftlbs at 4000 rpm

So for my question above. NO the engine is not stroked, just bored out. This also leads me to see that I could quite possibly run the turbo on the stock block. Maybe!!!! I wouldn't be able to run quite as much boost, but the pistons I'm getting made are only going to be 8.3:1. so what an extra .6 on the compression scale. I think it just might be a better idea to get the pistons

snwbrderphat540

are you sure you dont mean 2960cc for the VG30... cause 1960CC is a far shout from 3.0 liters.

AZ-ZBum

Correction for the Z31 information:

2960 cc
87 mm bore
83 mm stroke
84-87 Z31 NA: VG30E, CR 9.0:1, 160hp @ 5200, 173ft-lbs @ 4300
88-89 Z31 NA: VG30E, CR 9.0:1, 165hp @ 5200, 173ft-lbs @ 4300
84-87 Z31 Turbo: VG30ET, CR 7.8:1, T3, 6.7psi, 200hp @ 5200, 227ft-lbs @ 3600
88-89 Z31 Turbo: VG30ET, CR 8.3:1, T25, 4.5psi, 205hp @ 5200, 227ft-lbs @ 3600

machsound

Well even so the vg33 has more tg down in a lower rpm which is going to make for one heck of drag car once it gets turbo. Sorry my info was a bit off.

Comrade_Charlie

q45 pistons in a vg33 block must be crazy... 10.5 compression I think... Hope stock psi wont mess any thing up...

hoov100

i'd love to get a vg30e up to 11.5.1 C/R..

AZ-ZBum

Are Q45 pistons domed or something?

I believe the head design is very different. I don't think compression would be that high.

Comrade_Charlie

I just got this off of another forum... says 10 to 1 not 10.5

"The vh on the other hand is higher compression motor (10 to 1 versus the supra's 8 to 1)"

then another guy says "The static compression is 10:1 but the dynamic compression is a bit lower."

I dont know what the difference between dynamic and static is so...

AZ-ZBum

What pistons do in one motor is completely different from what they'll do in another.

Comrade_Charlie

ok cool, well we shall see... Im going to buy a complete q45 at the end of this month it doesnt run but im sure the pistons are ok... I have like 4 to choose from. its a nissan and infinity shop place moving so they are going to crush there cars so im buying one