Today I decided to show you what a 5.8 Final Drive Gear does to your Mazda RX-8,
how it performs in the wet/cold weather with 275mm Rear Tires.
My RX-8 is really just for cornering and hills so the 0-100kmh time is about equal to the stock RX-8 if I shift rather slow as seen in this Video.
I measured once with my softwaretool and got a 6.28 seconds 0-100kmh when the tires are dry and i launched it perfectly.
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What mods I have on the RX-8 you ask?
-Catless Downpipe
-Fox Hollow Exhaust
-Custom 94mm Tailpipes(they make the low RPM quite Bassheavy)
-Software Stage... well its my own so i dunno but it improved the 0-100kmh and 100-200kmh time a bit so it has to be good right?
-5.8 Final Drive Differential
-Sohn Oil Adapter
-Oil Temp/Pressure Gauge and Water Temp Gauge
-Lightweight Pulley Kit
-Upgarded Coils from AEM
-19 Inch Wheels 275mm Rear/245mm Front
-Lowering Springs 50mm
-Shockabsorbers for the 50mm springs not stock

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What Oil do I use for my Engine with the Differential?
I use 15W-50 Oil since the RPM are so high while driving.
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Would I recommend the 5.8 Final Drive?
Yes if you do a lot of town driving.
No if you do a lot of Highway driving/Autobahn driving.
But generally YES!
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What is the Topspeed with a 5.8 Final Drive Gear?
I did 224kmh on the Autobahn at 9000RPM
Probably if you would go to the limiter it would be 230ish max.
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What did my mods and the car cost so far?
Around 14100€ (7000€ was the car)
I got my RX-8 with 50000 kilometers on the clock.
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Is my car Reliable?
I fill up with 100-102 Octane Fuel with 400ml 2-stroke oil per tank.
My Software lets the OMP inject around 20% more oil per 100km than it would normally.
My Engine does have a combined compression of around 7.1bar on both rotors measured when Hot and at 62000km
I have 64500km on the clock now.
It never failed to start hot or cold and never flooded even when it's really cold outside.
So YES my RX-8 is reliable.
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More questions?
Feel free to ask in the comments!

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