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Triple Blowthrough Turbo


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Weekend update: 

 

Motor is done going to see if I can pick it up next week after the holiday. 

 

I went through and powdercoated all the suspension maybe 5 or 6 years ago? Decided to finally degrease the engine bay and tidy things up. So far as I can tell it's mostly original paint given the completed faded paint code tag on the radiator support. Might consider doing a quick body color respray or at least scuffing and shooting any areas of exposed metal. 

 

 

 

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Just about wrapped up with the engine bay prep and starting to unpack the other parts for the build. 

 

I'm planning to have my 240mm chromoly flywheel resurfaced + balanced and need to order a new clutch. I have brand new and lightly used exedy oe replacements in my parts bin but I'm pretty sure they won't hold 450+ hp/trq. I see OS Giken has a few options but they're pretty pricy and I'm not sure how streetable they'll be. 

 

Any suggestions on cost effective options? 

 

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Edited by Dat73z
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Posted (edited)

Pre-weekend Update:

 

Sold all my old clutch stuff and ended up ordering a OS Giken twin plate. Will need to modify my trans a bit but I'll get on that next weekend. 

 

Also managed to pick up the motor from Rebello today. Dyno sheet attached for reference. It's a 3.2 stroker @ 8.5:1. The f54 block, p90 head, and knife edged diesel stroker crank were spares I had in my garage that I didn't want to move when selling the house. Turbo parts from earlier in this thread. The other parts in the build like forged rods, pistons, bearings were all specified by Rebello. 

 

Edit: Realize the img is fuzzy. 10psi it made 359.1 Ft-lbs @ 4900 RPM, 370.2 HP @ 6100 RPM. ~11.5 AFR's, need to check the timing data, I think intercooler was heat soaking as well. 

 

Since the Mikuni short runner is ported out for my OER 47 carbs maybe I'll go OER 47 ITBs down the line. 20210604_140318.jpg.f4a9b0d4bf2ab10aa2d5f0b325eff4a7.jpg

Edited by Dat73z
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Finished modifying my transmission input cover and flywheel bolts.

 

For the OS Giken dampened twin plate 4mm needs to be removed from the input shaft area of the cover, and bolts ~8-8.5mm head thickness. The bolts are actually around the same head thickness now as the 240mm turbo/2+2 flywheel bolts but I gave those to the buyer of my old clutch setup so they could bolt the setup right in. 

 

Next step is to finish prepping the turbo manifold and send the assembly off to ATP for their inconel heatshield treatment. 

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Last post on the driveline prep before going back into turbo stuff although I guess technically this is prepping the driveline for the turbo. 

 

Didn't find much info on the OSG damped twin or triple plate setups online so hopefully this is helpful to someone looking into it and the modifications required. The OSG throwout bearing collar is extremely short, and the stack height of the clutch assembly relatively tall. 

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Quick weekend update. Welding up some brackets with the tig. Pulled the manifold off for some other prep and checked the porting. The transitions look pretty good, they're ported out to 47mm at the carbs, reducing to the Nissan gasket size at the head.

 

Still waiting for some misc. parts to come in. This next couple of evenings I want to clean up some porting I did on the exhaust manifold before sending it out. 

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Had a few mins this evening to keep welding things. I had a couple of mild steel an6 bungs that I boxed up before moving but I'm still unpacking and couldn't find them but I did find a stainless an6 bung and some 309L filler wire so I started on the turbo coolant feed. The plan is to keep the heater and feed the turbo from where the SUs used to and return back at the thermostat housing. I used to cap these off with a rubber plug but the rubber never held up for more than a year of commuting before cracking and leaking coolant. Hopefully this holds better. 

 

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Edited by Dat73z
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