My backyard hack - Page 5 - Lexus IS Forum
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post #61 of 67 (permalink) Old 03-27-2019, 03:52 AM
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Sorry for the engine problems, Pretty sure you'll be back on the road soon. Pretty Crazy built!!!

2002 IS300 - Manual 5-speed LSD M85
Color: Cromax YR580M
TRD Carbon Fiber Shifter Ball
Custom Made Complete Cold Air Intake
Fidanza Exhaust Cam Gear
OBX Headers / Megan Racing Y-Pipe / Thrush Catback
Yonaka Spec II Coilovers / Cusco Strut Bar
SPC Rear Camber Kit
DBC Performance Black XDS Rotors / Carbon Brake Pads
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post #62 of 67 (permalink) Old 04-06-2019, 08:04 AM Thread Starter
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Results are in, 2 melted pistons and 1 that pinched the ring, all bearings still look new, hopefully .5mm overbore will be adequate.
The more i liok at it the more it looks like boiled fuel in the rail. I’ll be switching my non return fuel setup to conventional return style system, i also bought some egt probes, i purchased some barely used second hand cp pistons and i also got an msd fuel pump voltage booster for cheap i’m going to power my coils with.
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post #63 of 67 (permalink) Old 04-06-2019, 02:10 PM
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post #64 of 67 (permalink) Old 04-22-2019, 05:38 AM Thread Starter
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Parts have started arriving, i scored some slightly used forged pistons for cheap, main studs, 6x exhaust egt probes, my new 3.73 front diff (old one was 4.3 which is way to short) will be here soon then i’ll source a rear to match and i also got an msd fuel pump booster to use to supply my ignition coils with 14-16v
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post #65 of 67 (permalink) Old 04-22-2019, 05:48 AM Thread Starter
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My awd block is scored in the bore and will need 87mm pistons to bring it up to spec so after comparing my awd and rwd blocks i have worked out a way of using a rwd block with a few mods to address the differences and just use the 86.5mm pistons i already have. My turbine wheel also lost some material so i’ll have one of those on the way soon too. My ported head is also in need of some attention so i will put my cams and valvetrain into my spare stock head and use it until i get around to cleaning up the damage to the quench pads on the ported head. I’m still undecided if i’ll spend the money and get billet main caps, my goal of 750awhp should be achievable on stock main caps but its one of those piece of mind items for my power goals.
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post #66 of 67 (permalink) Old 04-22-2019, 10:17 AM
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glad to hear this is making a come back!!!

Lucy; 04 manual sportdesign
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post #67 of 67 (permalink) Old 05-11-2019, 12:19 PM Thread Starter
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I have worked out how to use a rwd block in my awd application, the block is machined ready for assembly. I have an event i want to go to so i have to get committed and knock everything out in 4 days. Ive got to assemble and dress the engine, drill and tap my thick wall stainless exh manifold for egt sensors, replace the turbine wheel in my turbo, reinstall the diffs, engine, gearbox and transfer case, axles and driveshafts, convert my fuel system from non return to return system, test everything is safe, give it a light road tune and pack it up onto a trailer and drive 500km on friday.
I havnt got ahold of a 3.73 ratio rear diff to match my new front diff yet so i’ll be sticking with the short 4.3 until after the weekend.
The new setup will be a rwd block,9:1 86.5mm cp pistons with hd pins, pro drag i beam rods, a standard head with my uprated valve springs and 276/276 cams, the rest will be the same as before.
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