2002 Tacoma 3rz Turbo Build - Toyota Tacoma Forum
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post #1 of 96 (permalink) Old 08-10-2013, 01:35 PM Thread Starter
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2002 Tacoma 3rz Turbo Build

I did a lot of lurking in these threads and gained a lot of knowledge from old posts. I wanted to give back. I plan on maxing out the stock engine. The consensus is 12 psi is about the max it will handle. I wanted to start by making adequate fuel available. I bought a used mapecu3 from the for sale secton here on customtacos. Tred talked me into using an additional four injector rail instead of 500cc injectors in the stock rail. I'm really glad I went the additional injector route as it was easy to tune and whenever it wasn't in boost it started and ran like stock! Here are some photos of my 2003 Dodge Neon returnless fuel rail and "grey injectors" each 200cc I added to my lower intake manifold.

2002 Tacoma 3rz Additional Injectors (6).jpg

2002 Tacoma 3rz Additional Injectors (9).jpg

2002 Tacoma 3rz Additional Injectors (10).jpg
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post #2 of 96 (permalink) Old 08-10-2013, 01:56 PM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

The factory fuel filter is a pita to get to and I had to put in a tee after it to supply fuel to my additional fuel rail. I put on a new fuel filter and changed the location to one more accessible..right up top. I ordered a banjo bolt (summit racing ATM-2277) it's an auto-meter part number 2277 Fitting, Adapter, 1/8 in. NPT Female, 12mm x 1.5 Male. That allowed me to not cut the original hoses. It made the installation really easy.
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post #3 of 96 (permalink) Old 08-10-2013, 02:24 PM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

I wanted to make loads of midrange power and lots up top if I wanted to wind up the engine. I found a great deal on a used Treadstone log style exhaust manifold in the for sale section on customtacos. I bought it and started turbo shopping. I didn't really want an external wastegate because they add complication to an already complicated system. After reading rave reviews about Holset he351cw turbos with their quick spool up and great flow I started shopping for one. I got one off ebay that needed rebuilt. I rebuilt it and it will probably outlast the truck now since it lives such an easy life compared to what it had to do on the cummins diesel. The dsm and Honda guys love these turbos and I see why now. They are huge but spool very fast without costing much. Both turbine and compressor housings are 360 degree clockable too making them easy to fit. I had a leftover wastegate actuator from my 1g dsm I modified to fit the Holset. The actuator spring would do 10psi on my dsm but does 8 psi on the Holset without a boost controller. As you can see it fits tight but fits very well! I was concerned it was too big before I put it in. I later hammered out the sheet metal inner fender a little so it didn't touch the compressor housing when the engine rocked toward the passenger side under power.
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post #4 of 96 (permalink) Old 08-10-2013, 02:37 PM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

I wanted it nice and quiet so I retained the stock exhaust system for now. I made a downpipe that transistioned from the 3.75" outlet of the he351cw down step by step to the 2.5" inlet of the stock cat. I only had orange ceramic paint so that's what it got. I eliminated the front cat and added a bung for my wideband o2 sensor in addition to the stock afr sensor.
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post #5 of 96 (permalink) Old 08-10-2013, 02:40 PM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

I wasn't intercooled for two months until I did lots of intercooler shopping to find something that would fit easily.
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post #6 of 96 (permalink) Old 08-11-2013, 02:24 PM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

In the previous post you can see I had the maf sensor right next to the turbo. That didn't work well. The turbo made the air turbulant and drivability was bad. Also, I was sucking in hot air. I reinstalled the stock airbox and put the maf back in the stock location so I could draw in cold air from inside the fender. Intake air temps were much lower after doing this. This photo shows how I made the connection between the stock airbox and turbo. I used a flexible intake tube kit from Advance Auto Parts. It leaked a bit so I wrapped it in Gorilla Tape to make it air tight. It worked great but I knew I needed to make the maf blow through eventually. The maf was reading air temps close to ambient according to my bluetooth ELM327 and scangauge andriod app. I knew I had to get the temps the ecu was seeing closer to what was actually going into the engine. The maf isn't in it's stock location in the photo because I took this photo after I moved it to the blow through location.
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post #7 of 96 (permalink) Old 08-13-2013, 07:45 AM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

The intecooler installed easily. If I had gone any larger I would have had to cut things. It fit with no cutting other than the two holes I sawzalled on each side of the radiator. It's a 28" x 7" x 2.5" Bar and Plate intercooler with 2.5" inlet and outlet. I bought it from ebay in a kit with pipes clamps and couplers for cheap ($150 shipped). I only used a few of the pipes:
One 90 Degree 2.5"
One 45 Degree 2.5"
One 180 Degree 2.5"
Spectre 9405 3" Maf Mount Tube Kit (I use the largest plastic insert)
Three 90 degree 2.5" silicone couplers
Two 2.5" to 2.75" transition coupler (one on throttle body, one on turbo outlet)
One 45 degree 2.5" to 3" coupler for Spectre Maf Tube
One 2.5" to 3" coupler for Spectre Maf Tube
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post #8 of 96 (permalink) Old 08-13-2013, 08:03 AM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

My truck came with steel wheels I never liked. I picked up these stock aluminum wheels with Goodyear Wrangler Authority 265/75r16 tires already mounted off craigslist. I didn't really want bigger tires but it looks so much better now. As an added benefit my speedometer finally reads correctly. It was reading about two mph slower than I was going with the stock tires. It's dead on now according to GPS. That's a Lund tri-fold tonneau cover on the bed. This tonneau is a really nice design. Tri-fold is definately the way to go.
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post #9 of 96 (permalink) Old 08-19-2013, 07:28 AM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

I hooked up a fuel pressure gauge and sure enough my fuel pressure was dropping at rpms higher than 3500. I added a Vortech T-Rex fuel pump I had leftover from a previous (supercharged Mustang) project. It flows [email protected] according to their website. I have it activated by a Hobbs Switch set at 1 psi. Fuel pressure doesn't drop anymore.
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post #10 of 96 (permalink) Old 08-28-2013, 05:16 PM Thread Starter
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Re: 2002 Tacoma 3rz Turbo Build

I was worried I might be getting things too hot on the exhaust side so I installed an EGT probe today. I put it in the wastegate blockoff before the turbo. I went for a drive pushing it pretty hard and EGT's never get over 1550*F so I'm safe from melting anything. The ebay meter I bought logs the max temp reached which is nice so I don't have to watch it while driving.
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