3rz Rockcrawler Turbo Build Questions

You are correct, I was wrong about pressure ratio. I can admit that.

 

Sure, you've always operated on "seeing is believing" and I sway towards "calculating goals and accepting outcomes" observe non-idealities and change approach to combat them. I'm obviously not devoid of understanding that outcomes are going to be different than assumptions, but in this case I'm not seeing the variable you guys are claiming exists. Just explain it and I can work with it

 

The compressor has a huge range of functionality, those maps are easy enough to hit the center of efficiency on, I don't find much concern on the compressor side. On the exhaust side though, expecting a turbo to do what was measured in perfect circumstances and then to repeat that when you introduce real world large hindrances like say your exhaust manifold runners and combined wastegate setup functionally makes a lot of the equation pointless too. We've been seen lots of people do this math and then decide that a way too small turbine is the right choice. So either the math is flawed or the human doing the math is but either way we've achieved good results sizing up. Garrett is muddy on the matter too because then they tell you that the right turbine housing A/R is ideally the largest on you can go with that still hits your spool goal without causing surge.

 

Ok not to derail the debate, but I'm continuing my research:
•On the 3071, I've not been able to find a rule on determining the turbine house A/R. 0.64 and 0.82 have been recommended. What is the determining factor? I know the general rule that the smaller will spool faster, but will choke more. What is the deciding factor?
•Is the best place to get Pulsar turbo's from their website directly? I'm not seeing any distributors or US distribution listed on their website?
•You guys have convinced me to go stand-alone and likely a boomslang pnp harness.

1) Haltech 550 was recommended earlier, I noticed that it does not support knock control. This is however available on the MS3Pro. Is not having the knock control a concern?
2) Injectors - 550cc injectors have been recommended so far. With the aftermarket ECU how critical is the size of the injector? Not necessarily on the minimum side, but if I find a deal on 650, 750,950 ect does it hurt performance to run them at a lower duty cyle?
​

 

Haltech 550 will be plenty to run most things but will limit your inputs and outputs, 1500(what I'm running) gives you a lot of options for extra stuff including knock control, but to buy new, it's a better deal to get an s2 if they make a pnp for it as the wideband controller is built in and they offer WiFi connectivity to your laptop for tuning. Ms3 is an option, and they are solid, but tuner studio is a slog to navigate. Importance of knock control however is kind of dependent on who you have tune your truck. I tend to tune fairly conservatively for people and knock hasn't really been an issue.

I ran 750cc injectors and at 15.5psi I was at 84% duty cycle. 80+90% is considered a safe max for longevity of your injectors. I upgraded to 1200's on my setup, so I'd be willing to make you a deal on my 750's if you are interested. They should be plenty for what you are looking for. I want the ability to run e85 for grins every now and then so I needed bigger.

I ran the .63 on mine for about 2 weeks before I swapped it for the .82. I didn't notice a huge difference in spool and I still make boost at 2400rpm if I want to, but it feels stronger up top. That's on a 2rz though, so a .82 will likely be solid on a 3rz. I'll know in a couple weeks when I drop my 3rz in. If you do decide to go.63, you can buy the turbo without the housing and you can have my .63 for cheap. It's just sitting around. Pulsar is the easiest place to buy from as all the options are selectable. If you purchase from Amazon or somewhere else, you have to hunt for the correct specs of the turbo you want including turbine housing ar.

 

What is the determining factor on selecting a wastegate size? Is there a go to budget brand here? Seems like something you don't want to fail, but price range from $60 to $500 is hard to decipher. Are the Pulsar wastegates a decent middle of the road option, or would I be better off looking for a used name brand one for sale.

 

We've had good luck with the summit racing brand ones. They're pretty blatant copies of TiAL valves but have worked well.

 

It looks like the smallest they go is 44mm, is that a good size option?

 

I really like the quality of the summit racing wastegates and blow off valves. I'm running one of each on my pickup. 65$ each, made in the USA, and solid build quality. Great budget option

 

I run a 44mm gate on mine. I had boost creep with a 38mm on my setup. A buddy that races insanely fast Honda's tells a setup with "too much wastegate"

 

And so it starts, Pulsar 3071, WG, BOV, AFM, Oil lines all ordered.

Today I removed the intake, exhaust manifold and egr.

The next major piece I need to get ordered is the manifold. I was set on ordering the Tredstond DIY Log manifold kit https://www.treadstoneperformance.com/toyota-tacoma-diy-log-manifold-kit/p103645 until I saw they want $93 for shipping. Rolling the dice on the ebay manifold is looking more appealing at that point.

I'm looking to see if I can source the fittings locally and just buy the flange.

 

You could take a look at the KO racing turbo manifold. His stuff is super affordable and built well.

 

Treadstone also lists an iron turbo manifold. It's $450, but that's what I would be looking at for longevity.

 

Ok, found the pipe fittings on a separate site and got everything shipped for $40.

On the exhaust, is 2.5" diameter sufficient? The turbo has a 90mm vband so I'll need to figure out the best way to reduce it down.

 

2.5" will be plenty for your power goals, but 3" wouldn't hurt either. Ace race parts has nice reducers you can buy to neck it down to a 2.5" if you stick with that

 

I like where this thread is going. I was going to redo my turbo 2rz setup but decided building a new buggy was necessary lol

Currently looking at the Pulsar turbo for the 3rz going into my buggy

 

I love my pulsar, and we will likely do another pulsar, maybe a 6466 on our drag truck 5vz when the time comes as well. Bang for buck they are very hard to beat

 

Id like a set of 750s If he passes shoot me a PM

 

They're mine! Well as soon as I pay the man.

 

Here is some motivation for you. We will be looking for progress.