shoes138

As you all know im tryin to twin turbo my 3vz but first i even start with the turbos i need to make sure that the bottom end of the 3vz will hold the pressure. So my question is........What is better for making the crankshaft, connecting rods, And piston stronger? Forging or Cryo?

Also does any one know anyone that forges or does cyro??

And other thing i have read that the piston wouldnt really need to be forged or cryo because the first things that would break woud be the crank or connecting rods. this is were i read it from http://malaysia.answers.yahoo.com/qu...5203449AAN2Rbc

Thanks guys!

TNRabbit

I posted this link on toyotanation.com in response to your question there as well. This engine can be configured for 300 hp pretty easily & still weigh less than the 3VZE; it was purchased by Rover from Buick & still used today as their 3.5 liter V-8. First appeared in their Triumph TR-8:

http://cgi.ebay.com/ebaymotors/215-3...spagenameZWDVW

tc

Ummm - forging and cryo are TOTALLY different things, and you can have both.

Forging is how they make the part. Basically, you take a hot (2000F) piece of metal and squish it with a powerful press. This results in a finer, more uniform internal grain structure to the metal compared to casting. Think of the difference between cheap pine and oak.

Cryo is a heat treatment process where the metal is cooled to a very low temperature. As steel is heated, it transforms internally from one crystal structure to another (it's why hot steel isn't magnetic). When you do normal cooling, sometimes some of the crystals get "stuck" in the higher temperature form. When you get it cold enough, you can force most of them to change over to the stronger room temperature structure which gives you more uniform properties.

norcalsvx

cryo treat the forged stuff...

dcg9381

How much power will this motor put out? That's going to be your determining factor for starting to plan the build.

As mentioned before, if you're putting enough power through the v6 to need a custom crank, converting to a 4.3L or something like it - which has a ton of high performance parts available (including superchargers/turbos) would be a more constructive and effective way to go...

What's your plan for EFI? You'll hit the limitations of the factory EFI far in advance of twisting up your crank. Waay in advance....

I've never seen a twin turbo (non-sequential) V6. Have you considered using a single turbo that meets your needs for power? Garrett builds these beautiful ball bearing water cooled turbos (GT-series) that spool down low and can flow a lot of air...

mt_goat

I've seen a crank be the weakest link on one guys supercharged 5VZ here:
http://www.tacomaterritory.com/forum...ad.php?t=64180

shoes138

i think the weakest link on this motor will be the connecting rods then the crankshaft. Im trying to at least see if i could anywhere near 400hp out this motor.
Does you guy know anyone that forges i cant find no one. Also wouldnt it be alot cheap to cyroed the pistons, crank, and connecting rods?

Yota82

I've always found it to be the rods. Most twin turbo setups are small fast spooling low boost turbos. Personally I wouldn't worry too much about the crankshaft and put a good set of rods in it and some forged pistons.

shoes138

my problem is cant find anyone, and the only ones i see doing forged pistons is DOA. and we all know about DOA. also i wanna see if the 3vz-fe crank will fit the 3vz-e block.

surf4runner

shot peen the rods.

JE pistons(through summit) will custom make to your specs.

dcg9381

Some advice on dealing with DOA, LC, or most any other vendor:
"They don't make most of the parts they're selling"
I'm much less concerned with buying individual parts. If you're concerned with reputation, be concerned with assembled products, not individual parts.

The quality of that part has almost nothing to do with the vendor, unless the part is spec'd wrong or produced by that vendor exclusively.
The forged slug you get from DOA is the same forged slug you get from LC. They originate from CP piston...

IE - Tim's just going to go to a reputable shop that builds rods and source the parts at a wholesale price. If you want custom rods, talk to the guys building custom pistons - Venolia, CP piston, maybe Wiesco... They'll have a reference for or be able to send you to a vendor that sells for them directly. Hell, I'd bet that Tim would tell you who makes the rods that he sells.


Again: Whatcha going to do for timing / fuel? Bolting the greatest single/twin turbo setup to a 3.0L won't do anything for you if you can't manage it. Reminds me of a guy over on the F-150 forum that spent 8k+ on a 5.4L motor, only to find that it ran like crap on stock fuel injection.
I haven't seen a lot of aftermarket EFI offerings for the 3.0L - or at least none that anyone was willing to put the time in.

shoes138

for efi i would have to go megasquirt to control everything

dcg9381

Shoes, one thing you could do is get MS setup and working with your motor now. It makes debug of issues way easier than trying to swap a brand new high-end motor in, debug EFI issues, tune fuel, and tune spark at once.

You'd be many a 3.0L owner's hero if you get MS working with the 3.0 - I believe you'd be the first person to do it.

I think it's very doable, just not a lot of market for non factory EFI on the 3.0.