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Atom's Amazon Wagon Project Update Thread

Atom D&D said:
Yellow= turbo coolant (interesting that in and out are on the same branch of the coolant pipe
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The water cooling circuit for a turbo doesn't need much pressure differential, just flow. The crucial thing is that water can thermal siphon through the center housing after the engine shuts down, which reduces heat soakback from the turbine side into the bearing and seals. Having water there to wick heat away greatly reduces oil coke formation.

The thermal siphon concept is weird but basically the most critical time to cool a turbo is right after a hot shutdown. With the engine oil pump and water pump stopped, there's no forced cooling of the turbo but there's a ton of heat in the exhaust side that needs to go somewhere. By clocking the water ports to have one side slightly higher than the other, hot water will naturally rise out the high side and cooler water will flow in to take its place from the low side. You get a passive cooling effect that's significant enough to make a big difference.

Short version: try to rotate your center housing a few degrees and allow the higher of the two water lines to have a constant uphill run from the turbo back into the cooling system.
 
Atom D&D said:
No AC. The E30 isn?t equipped for it either. It was a stripped euro car. No AC and no power steering. Worked well for me.
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Got it. I forget that some places are more comfortable than the Texas coast in the summer. AC is pretty much standard equipment around here.
 
I like your mounts - looks like they worked out rather nicely with the modified E30 crossmember. Also it must be super convenient to build them on a bench without the car in the way. Nice work as always.
 
sdewolfe said:
Got it. I forget that some places are more comfortable than the Texas coast in the summer. AC is pretty much standard equipment around here.
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No AC needed here in Seattle really. I always have my XC70 if it gets too bad out. I?m not interested in the complication on this car though.

Duder said:
I like your mounts - looks like they worked out rather nicely with the modified E30 crossmember. Also it must be super convenient to build them on a bench without the car in the way. Nice work as always.
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I was concerned since the mount has to straddle something on both sides, but I think it?ll be fine. I need to notch for the steering rack a little. The only thing I?m a little worried about is whether or not the mounts will compress more under the engine?s weight. Shims or poly mounts will fix it though.
 
A little up pipe and down pipe work. Waiting on some stainless rod to come in to fab up a support for the turbo so the weight isn’t all on the up pipe. Also waiting on a bunch of fittings and line to show up from JEGS. Just chipping away.

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I still plan on building a complete custom header with the flange that was graciously donated to me, but this way I can reasonably figure out a proper sized turbo before I spend a bunch of money on weld els. Budget first, upgrades later.
 
Few more things done:

-thermostat spacer to add an E30 temp sender for the dash gauge.

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-upper intake spacer to clear taller injectors (S40 injectors are short and I’ll probably just run greens for now)

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-hardlines for turbo coolant in/out. Had to order some different -10 fittings for the drain and still waiting on a straight -4 for oil feed as well as the time to weld the -4 and -10 steel fittings to the OE hardlines.

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Oh, also added some 3/8” stainless bar to support the turbo

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I don't think the copper will see temps or pressures where work hardening is an issue. Cu/Ni (cunifer) is also an option - and polishes up just about as nicely as copper, although not as 'pretty' a copper color. The lines look nice. I think we all know that the aesthetic approach taken on this project has always been different and interesting -- in the best possible way. Cool stuff.
 
M.H. Yount said:
I don't think the copper will see temps or pressures where work hardening is an issue. Cu/Ni (cunifer) is also an option - and polishes up just about as nicely as copper, although not as 'pretty' a copper color. The lines look nice. I think we all know that the aesthetic approach taken on this project has always been different and interesting -- in the best possible way. Cool stuff.
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Yeah, I’m not sweating it too much. Also, it’s just water. If it cracks it won’t be spraying hot oil all over the turbo.
 
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Made an oil pressure block for the dash light and ECU. I used nickel copper brake line. I welded a -4AN fitting to a turbo banjo line that threaded into the OE oil pressure sender port.

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I added DEI titanium wrap to the up pipe to keep the gasses hot and keep all the other hoses nearby safe. I also added an 1/8” NPT port near the turbine inlet. My tuner says we can put a pressure sender there (with some tube to insulate from the heat) to get a feel for turbine sizing and pressure ratio (or something like that).

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