blakpete91 88 F-250 IDI Build thread

tjsea

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My turbine housing mounts the same way, it has a bunch of holes around the housing. I found this on Garrett's website about the turbo mounting. There was a technical paper I remember reading, but I can't find it online at the moment.
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jwsfarrier

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Hi Wes. Another great project. I'm running the R&D kit as well and definitely struggled getting around the injector line with the intake. Wondering if you could post the part number for that Spectre boot you used. Great looking build!
 

Thewespaul

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I saw that on the website, my parts for the drain should be here in a few hours, gonna try and set it up on the 10 o’clock hole, definitely prefer the precision turbo style and s400 turbines of this frame size with the v band center section, don’t see why Garrett still uses this design.
 

Thewespaul

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It’s the tight radius spectre boots
9781 for 4”
8791 for 3”
 
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tjsea

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@Thewespaul I'm not sure why Garrett ever went to that style either. The old turbos with the clamp bolts worked too and gave you more adjustment room.

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Thewespaul

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While waiting on the oil drain parts, I worked on assembling the fuel system for test firing the engine, this isn’t how it will be arranged in the truck but it’s nice and compact for testing. Pump is a Walbro GSL392 like in the shop truck, with the billet Holley bypass regulator.

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The oil drain parts showed up and I pulled the compressor housing off and reclocked the turbo one bolt hole from straight up and down ( I checked the angle at that position and it ended up being about 5.5* sitting on the stand) and just moving it a single bolt hole shifted it to 40.5* which seems too extreme for me. I’m thinking of running it at the 5.5* position, monitoring outlet temps and seeing what it looks like in the chassis.

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blakpete91

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Guess this was one of those cases where the instruction book was not a "manufacturer recommendation". I was so excited to get this build going I forgot to give you all the papers that came with it. Sorry for any headaches this may have caused. Thanks for the updates wes!
 

Thewespaul

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No worries man, pretty accustomed to parts that need some massaging to work on our engines, they weren’t exactly designed for a gt4088 to be strapped on the back of them!
 

Thewespaul

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Got the oil drain dilemma sorted for good hopefully. This is what I came up with, -10 an stainless bung welded into the oil drain disk and pressed into place with a dead blow and some CAT bearing mount, and built the drain itself from a straight and 45* hose end.

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Thewespaul

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After getting the turbo back on, I drained the few gallons of diesel I had sitting in the crankcase to flush out some water that was in the pan from the engine got removed a few years ago, and filled it up with some fresh oil from the oil feed line so the turbo is prelubed. I cranked the engine until I had 30 psi of oil pressure and solid compression. I checked comp numbers while doing this, the lowest was at 355 and highest was 410. Reinstalled the glowplugs with one of my na harnesses so I could manually glow the plugs, and after priming the fuel system the engine fired and ran nicely, although with a pretty good lope without any load on the engine.
 

Thewespaul

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The stock harness had seen better days, I'm replacing the glow plug wiring with my full kit so I wanted to strip that from the engine harness along with the fuel filter wiring that won’t be needed.
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Pulled my schematics out for this 88 harness and started depinning the main connector.

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Unnecessary wiring on the left, and the remaining harness on the right. Only four circuits ignition (including high idle and cold advance) oil pressure, coolant temp and fuel pressure.

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Thewespaul

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Cleaned all the grease off the four circuits, re-loomed the new harness and wrapped it in high temp loom tape.

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blakpete91

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Those wiring schematics are very useful. My dad gave me one for this 88 when he passed it down to me. I've used it once and was glad I had it. Your attention to detail is spot on as always Wes! Just curious, will the wait to start light inside the cab still function with your wiring harness kit? No big deal if it doesn't, just something I've been wondering about.
 
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