TurboMini's 1986 CDM BJ70 Turbo Project

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Apr 19, 2010
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I am always building some type of car project, I prefer Toyotas and classic Minis. My latest project is a 1986 CDM BJ70 which I bought from a friend.
(Here is my BJ70 with my stock collector plated 1984 Supra 117,000 kms)
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Relatively good shape, a little rust in the rear quarters and some surface rust on the frame, but it is quite solid. It didn't run when I got it, just had to replace the steel fuel line coming out of the tank, it had rusted through. It is now stainless steel.While I had the tank out I also repaired the right rear quarter while I had the filler neck etc out. Still needs a little finishing work and some paint. The left quarter is not so bad, hopefully I'll get to it soon.
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Anyway, as you all know, a little more power from a 3B is a welcomed improvement, as well as better fuel economy and some very pleasant new noises!
I whipped up a manifold with some help from my plasma cutter and TIG welder. I welded it up including provisions to bolt up some stock Toyota brackets. I had the mating surfaces machined before bolting it up.
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I used a turbo from a Mitsubishi Starion (2.6L 4 cylinder)
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Here it is bolted in:
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Modified stock air cleaner box.
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I used stainless as much as I could, including clamps and exhaust, and also I used some 4 ply reinforced silicone couplers.
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Here was my temporary exhaust while I was waiting on my stainless v-band clamps so I could finish the exhaust. This sounded awesome, the noises the turbo made were brilliant.
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Here are the clamps and my exhaust that I made myself out of 2.5" tubing and mandrel bends I purchased. No muffler. I ran the exhaust inside the frame along side the transfer case. Everything is tucked up higher than the bottom of the frame so it should be difficult to hang it up on anything. I cleaned up and painted the frame in areas I won't be able to get to once the exhaust was in. I'll do the rest later.
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The turbo sounded a little strained when the throttle plate slammed shut so I thought I'd install a blow off valve. I used an old part I pulled off an old Toyota truck that I was about to throw out. It was never intended as a blow off valve but it does the trick. Does anybody recognize it?
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Here is where I picked up the vacuum signal to open the BOV.
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I’m running a max boost of 12 psi which I adjusted with a boost controller I made out of a few fittings a spring and a ball bearing and it works great. I originally had it T’d off my boost gauge line but it was playing havoc with the needle on the boost gauge so I welded in another dedicated bung so the boost gauge and the boost controller each had their own hook up. The pyrometer reaches a maximum of 1100°F pre-turbo on a long steady climb in 5th.
 
I have installed a 30A Solar Converter to balance my batteries and allow me to have a 12V source and not destroy my batteries or charging system. The previous owner had problems because a stereo shop wired a 12V stereo directly to one battery with no converter or balancer. I have fixed the wiring for the stereo and a couple other things I didn’t like. The converter is wired in with a 24V relay so it is only active when the ignition is in the on position so I can avoid my batteries being drained if the truck sits for a few days. I installed an auxiliary fuse panel for all my 12V source needs under the passenger side dash. 2 terminals have constant 12V, 2 are controlled by a relay the provide 12V with the key in the ACC position, and the other 2 with the key in the IGN position. There are a few other minor electrical things I’d like to clean up, but I’m getting pretty happy with the electrical system. I tucked the solar converter in the fender and it’s bolted to factory mounting points.
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Here is the gauge pod I made, originally it was just bare aluminum with welds showing which was nice. But I wanted it to look a little more stock so ground down the welds and painted it gray. It mounts to factory screws (I don’t like to drill holes in my Toyotas.) The lights in the gauges are 24V bulbs I picked up from Toyota and I wired them in to the dimmer circuit but I the pyrometer itself runs on 12V.
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The last thing I’ll do on the turbo project is maybe polish or paint the stainless tube I made between the turbo and intake.
 
Welcome to the board. Nice work on your truck, looks great! Did you notice a big improvement in power climbing hills? Are you in the Lower Mainland? Just noticed in one of your pics that the clock in your truck has an alarm and stopwatch function too, deluxe!
 
I'm on Vancouver Island. I noticed a huge difference in climbing hills. Now I look forward to them because of the beautiful sounds my engine now makes. Instead of downshifting I usually accelerate slightly when the turbo spools up with the extra load on the engine. Or I down shift one gear instead of two. Big difference in power so I'll probably leave the settings where they are, but it is tempting to crank the boost a little more and add some more fuel. I tried a little even more fuel and it made an even bigger difference, but I turned it back down to stay safe. After knowing the difference between a turbo diesel and a non-turbo diesel I have to say every diesel I own will definitely have a turbo.
I do love my clock, I was pretty excited when I noticed the the alarm and stop watch. But I was more excited about the suspension seats. They are a must have, I want suspension seats in any 4x4 I ever own now.
 
Good deal, thanks for the info! Love the DIY work that you did on this. If I am on the Island is there any chance that you could take another 70 guy for a ride in your truck, so I can see what my truck would be like with some real power? Beer/diesel money is on me. :) How many kilometres on your truck? Did you do any other engine work to strengthen it for the turbo? I am 100% with you on the seats, I have been bouncing up and down some rough mountain trails for work in mine lately, saves a lot of chiropractic bills.....
 
1985bj70 - I'm in Victoria so if you make it over to the island I'd be happy to show you what I've done and take you for a ride. My truck has 345,000kms and I've only done basic maintenance on it, and I bought it from a friend who took good care of it and gave me a stack of receipts with the truck. It seamed to be a strong runner when I got it. I try not to drive it too hard because I want it to last, but that is tough now with the turbo, it's so much more fun to drive now.
I'm a Chiropractor so I hope not everybody has the suspension seats in their trucks, I need to make a living so I can keep building my projects!
 
1985bj70 - I'm in Victoria so if you make it over to the island I'd be happy to show you what I've done and take you for a ride. My truck has 345,000kms and I've only done basic maintenance on it, and I bought it from a friend who took good care of it and gave me a stack of receipts with the truck. It seamed to be a strong runner when I got it. I try not to drive it too hard because I want it to last, but that is tough now with the turbo, it's so much more fun to drive now.
I'm a Chiropractor so I hope not everybody has the suspension seats in their trucks, I need to make a living so I can keep building my projects!

Very cool, thanks! Thanks for the info on the truck, looks like a nice rig, and the colour is good too. Seems like a fair number of the Canadian BJ70's were black. I hear you about the seats too....
 
Just found this via a link - Great turbo build, love the BOV.

I really should finish mine, I'm slack.

Fit an intercooler next - easy and fun - Intercooling - my write up.

However, if you don't like drilling holes in your Toy, you'll hate fitting the hood scoop

;)
 
Such a sweet truck man. hope the re-turbo project is going: leave the sports cars alone for a while!

Chris
 
Very Nicely done!
 
Thanks Guys. I'm still doing some work on the MX5's. But I do plan on doing some work on the LandCruiser soon. Still trying to find the next turbo I'd like to use, but I'll probably start with some basic maintenance and replace the heater core which has a small leak.
 
Might be trying to raise the dead here, but. . .

How good is the vacuum from by the throttle body? I have a Garrett GT2052S out of a SAAB which has a built in bypass valve, which I am having difficulties figuring out how to plumb. . . Would your set up generate a considerable amount of vacuum once the throttle was closed? (And no vacuum otherwise?) Is that the same way your custom blow-off works?

Much appreciated
 
I assume you mean the wastegate when you say bypass valve. My signal to open the wastegate is attached to the charge tube that crosses over the engine before the throttle plate. My signal to open the blow off valve is after the throttle plate.
 

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