Turbo Sizing

[ToyMota 4Runner]

Ok am new to this game so can someone help me figure out if I was going to put a turbo on a 3VZE V6 3lt what size would I use ?

[Roundy]

first problem i see is whether you will use 2 turbo's or 1 on a V6

First thing u need to do is determine your power goals, and from there u need to start picking turbos to reach them that are suitable.

go here and read the turbotech articles first, they will give u a grounding in what needs to be done!

[ToyMota 4Runner]

well am only looking at running fairly low boost so that the poor old 3VZE doesnt need major work to handle the pressure. Say 3 to 4 psi.Not looking at breaking any records just maybe some better torque numbers that may increase economy .
Secondly the turbo will actually be going underneath the back of the truck as basically their aint much room in the engine bay and anything to suit will have to be manufactured by me anyway. The guys at Squire Turbo Systems in the states are having great results with rear mount so figured might have a look into it
something like this

[chris davey]

Learn how to read a compressor map and see what will suit your goals.

GT30R with .8X rear would give a low boost threshold and if you up the boost should make close to 300rwkw depending on how the engine can take it and how well it flows.

If you choose a turbo too small, it will give instant boost but will die off in the top end because of the increased back pressure. Well that is how it works on a normal setup, no idea about a remote mounted one.

[-==L=a=N=c=E==-]

http://toymods.net/forums/showthread...ighlight=turbo

Read this thread i wrote, gives a very basic guide for turbo sizing.

[ToyMota 4Runner]

Thanks Chris
might send an email to the guys in the states and find out what they use on their remote mount for a Tacome which is very similar to our Hilux. Even though the enhine is 3.4 lt compared to my 3lt it will give me an idea where to start

[Skip]

well am only looking at running fairly low boost so that the poor old 3VZE doesnt need major work to handle the pressure. Say 3 to 4 psi.Not looking at breaking any records just maybe some better torque numbers that may increase economy .
Secondly the turbo will actually be going underneath the back of the truck as basically their aint much room in the engine bay and anything to suit will have to be manufactured by me anyway. The guys at Squire Turbo Systems in the states are having great results with rear mount so figured might have a look into it
something like this

Putting a turbo undrneath a 4WD is a pretty silly idea there is too much possibility for damage when you are wheeling. For what you want to do, low down torque, low boost i'd say a supercharger is a much better option.

Has anyone other than Squire Turbo Systems said they are having great results with a rear mount system? Id say it would be lag city.

[ToyMota 4Runner]

well its not really a 4x4 more a toy as it has such limited travel and I dont want to go down that path as it costs way too much in this country.
The biggest problem I face is that the Japs in their infinite wisdom crammed so much stuff in the engine bay that its hard to work on let alone install anything else into.Hence the rear mount idea.I was thinking bout putting the gear behind the diff or above it so thsat it would be very difficult to get it damaged.
Another way to look at this is, consider how much pipework can be involved in the install of a turbo with intercooler. All up there can be a fair bit of pipe and it would all be bends and joins etc therfore slowing down the flow. The rear mount on the other hand doesnt suffer that issue and the pipes would only possibly be a little longer but all mostly straight.
I have read a few articles about the remote systems and they all say that lag isnt a worry as long as the correct size turbo and piping is used . I mean the theory is only moving air at pressure . I honestly am just getting more confused the more I look into the whole turbo idea.
I was even contermplating a small SC14 blower driven off the tailshaft to be used under load as the truck is fine round town and at low speed its when the speed picks up that it suffers the most.Wide open throttle is very commen when over the 100km mark

[ToyMota 4Runner]

if anyone wants to have a look here is their website http://www.ststurbo.com/home

[Toysrme]

If you want my opinions & their "whys":
1) You have plenty of room for intake pressure on a quality replaced head gasket. Assuming stock static compression ratio the PEAK EFFECTIVE (Only achived during N/A peak volumetric effecciency @ 3400rpm & drops off rapidly) compression ratios:
5psi = 10.11:1
7psi = 11.04:1
9psi = 11.96:1
11psi = 12.89:1
13psi = 13.81:1
15psi = 14.74:1
The way I see it, on good gaskets, with correctly torqued heads you should have 0 problems with a head gasket blowing out from 9psi. That's nearing the peak effective CR that isn't even seen for more than a half a second. 15psi would be starting to push it alittlebit.
That's concerning the headgasket. Obviously, pre-ignition & detonation will both blow out a head gasket, or kill a piston / ringland, so some form of fuel enrichment under boost is still a must.

Please understand that pressure does't make power. The mass of the charge does. (The pressure of said charge is fairly irrelevant.) A large flowing compressor at low pressure output will be equivilant to a smaller one at higher pressure & etc.

My suggestion for you would be the opposite of what most people normally tend to do. The majority of the time (When the base engine's reliability isn't really a major question for the powergoal). People in general tend to over-pick their turbo. While that's fine, that does sacrafice responce.

A good turbo for your goals would be a common t3 63/60 for 2 banks, or a t3 48/60 for 1 bank. A 60 trim t3 compressor should be fine to make an easy 200bhp on that engine. Start pushing it alittle and you could likely max out the 240bhp stock injector's fuel supply @ 60psi of fuel pressure (& a safe 85% injector duration) by pushing the turbo nearer its surge by raising the psi.
Past that, a SMALL t3 63 / t4(or t04e) hybrid would easily take you past 300bhp if that's what you're shooting for.
Boost responce for any non full T4 turbo should be outstanding. Boost in park/neutral with no load, boost before 3000rpm.
That's where you can pick up a mpg, or few cruising around with a smaller turbo.

My spark plug reccomendations can be found here.
Retard the distributor 5*btdc to begin with. You can add timing back in later if you desire. You can probably get away with stock ignition timing provided it doesn't get too hot.

Blow THROUGH the AFM. Doing so will give you little fuel re-tuning to do at the power levels mentioned. A cheap fuel pressure regulator, along with the AFM cog adjusted. If you want... An extra cold-start injector can be plumbed pre-throttlebody & activated via a boost pressure switch for afew more horsepower. You can also wire a BPS to a simple circuit to enrich the fuel. Think $5 SAFC, but only under boost.

Blah blah blah run an intercooler. Whatever you can afford is better than nothing. If it's the smallest, most restrictive, Free-$15 DSM intercooler. It's still better than nothing.

If you get to where you want to start pushing it. (It's addictive) Water injection can't be beat as an anti-detonate / safety against lean out. You can also add to that a small aireator nozzle to spray the intercooler. Woo-hoo.

A t3/t4 hybrid is going to be large for the power goals I can tell your look at starting with.










At any rate. It's a very, very simple project. You've already fixed the crossover pipe. So think about just single-bank'ing it off whatever t3 you can buy with a 60 trim compessor. A hand full of welds will get you boost, unlike so many others & there should be ample room to do it.

[ToyMota 4Runner]

kool that sounds like a plan
will have to start hording the pennies

[Toysrme]

That's the easy part of a custom turbo project. Gather your parts one at a time. Then one day you wake up & realize... You've got about all you need, so it's time to get started.