3rz Rockcrawler Turbo Build Questions

I have been researching alot and want to see what input I could get on my planning.

Truck is a 85 toyota pickup with a 97 3rz swapped in, w-56, dual toy transfer cases, D60/14B axles 5.38 gears on heavy 42" TSLs. I run the Rubicon, Fordyce, Dusy Ershim rock trails.

Most crawling is 800-2000RPM. In this range with my gearing I have no problem torque wise. However, when it comes to sand/snow/ road driving, it would be helpful to have some more power. Not some thing I entirely need to do, but why not. Truck gets trailered to the trail and sees maybe 200mi of driving per year. Lots of the info I have been finding is more applicable to street trucks or lighter 4x4 builds.

Plan:
-GT2871 0.64 A/R(probably a Maxspeedrods cheapie)
-Mazworx flange & weld up a pipe fitting log manifold
-Water to Air intercooler
-Pink top injectors
-AEM wideband
-Hoping to keep it on the low boost side of things maybe 6-8psi. If it made 180-200hp to the wheels would be great.

Questions:
•With my low gearing I was looking at keeping the turbo on the smaller side of the generally recommended GT3071. Does the GT2871 seem like a good option?

•Off road I can occasionally get some short low oil pressure conditions. I'm assuming a BB version would be less tolerant of the low oil pressure situations. Is this correct thinking?

•I'm liking the internal waste gate on the turbo for simplicity. At the low boost I'm planning is there any concern here?

•For a low boost relatively stock build are the pinktops adequate or is there a better option that the stock ecu has a chance at controlling?

Thanks in advance

 

Nobody? Did I post in the wrong forum?

 

Maybe cross-post it to the first gen section, since it's got a 3RZ?

 

I don’t know him and there lots of smart people here but I’m pretty sure your best bet is for @Torspd to see the thread if it’s a turbo question.. sorry to all if I’m mistaken.. now he should be notified

 

And cool project, welcome!

 

Thanks guys

 

We here now haha @2RZNoShi1

 

I meant these guys too lol

 

First off, from a guy that's run boost on a stock 95-97 4banger ECU... You won't like it. It heavily retards timing in response to increased cylinder pressure as the knock system is over reactive. Also anything above 4-5psi is probably not going to be very happy fuel wise even with pink tops because the only time those richen up the mixture is in open loop. So part throttle boost (which that very small turbo will make) will go lean. If this isn't a street rig maybe consider a standalone ECU. Would be zero problem making 200+ HP with a 3071 and .63 housing and a Haltech Elite 550. Low oil pressure won't be a huge concern, so go for the BB turbo and help your spool, high pressure makes them unhappy but low pressure is fine as long as it isn't catastrophically low under heavy acceleration. @2RZNoShi1 and I have done the turbo 2RZ, 3RZ, and 5VZ a lot, feel free to ask us questions.

 

Awesome feed back, thank you. The 3rz swag is Ca certified, so my goal is to do everything reversible, in the off chance I want to sell it. I'll look into the Halltech unit. Is the haltech preferable over the microsquirt systems?
•If I go with a standalone computer are there injectors better suited than the pink tops?
•On the turbo are saying the T2871 I was looking at would be too small? Looking at the turbo maps it seemed like the right size.
•The benifits that I am seeing for external waste gates seem to be mainly at high boost. If I am running 6-10psi boost am I going to notice a difference.

Here are a couple shots of the rig for those asking for pics

 

Badass.

 

The two main advantages for the Haltech are ease of tunability as there's lots of 3RZ folks with them and if you wanted @2RZNoShi1 can remote tune it for you and ease of install since you can get a plug and play harness for it from Boomslang and just unplug and unplay when CA testing comes along haha. There are some good injector options from 5-0 Motorsports, somewhere in the neighborhood of a 550cc would be about right

 

I 2nd all of this

 

I think the 2871 would feel very linear in power. It should just feel like an overall bigger engine. Which is more what you want when you are trying finess your throttle and power inputs for particular sections of trail.

 

I personally have a 3067(it's a pulsar hybrid of the 2867 comp wheel with a 3076 turbine wheel) and I had very good boost response with a .63ar housing on my 2rz. A 3rz would be even faster. I personally like the .82 housing more. It will still make boost at lower rpm under load, but flows a lot better up top. If you go with a 2871, I would recommend against a smaller turbine housing, it will make boost really fast, but will likely choke up pretty hard at any kind of higher rpm. You could probably get away with a .63 housing on a gtx30xx turbo without choking too much.

 

As far as the rest of the stuff, @Speedytech7 nailed most of the points. Haltech gives a lot of reliability, safety, and consistency that a factory ecu setup will not. I have 750cc injectors in my 2rz and I'm about 85% duty cycle at 15.5psi making 318whp and 336wtq. So 315cc injectors likely won't even get you 5psi without maxing them out.

 

Damn, this got more expensive fast. Ok, I'm back to the research. I'll look for a good option in the 3071 size. On the tuner, where is the best place to buy the Haltech 550?

 

Tuned by Shawn or MAPerformance is usually a good place to find them. Sometimes they're out of stock on the 550 for a little while (Haltech has been trying to phase that model out but they always seem to make more), could get a 750 instead it'll do the same thing with a couple extra inputs and outputs to use down the road if you wanted to add a feature or something

 

Also keep an eye out on marketplace for used ones that pop up as people upgraded. Can sometimes snag good deals. It's a bit more upfront, but you would be way happier with the outcome if you have a legitimate tune on the rig instead of fooling the stock ECU. A 5vz guy I'm getting dialed in right now said the base map I sent him felt better than his stock ECU with a fmu ever felt, if that gives any indication