2004 or 2010? Also porting.

LiveWire · 07-14-2011, 09:54 PM

I heard the rx8 13bs dont take well to forced induction because of high compression ratio and lightweight rotors, so my solution was the superdense (I believe thats what they are called?) rotors and a tune. Is this incorrect?

I was thinking ceramic to hold up better at high rpm? (another assuming info is correct) My plan was to basically prep the stock rx8 13b for FI down the road and this FI would be tuned for high rpm boost, since the rotories do well in high rpms anyway. haha I have accepted the plague of low torque at low rpms, it does not bother me too much. Anyway as for the 100k+ miles, I just dont want to get a used car and have the engine "fall apart" (I do understand its not literally falling apart rather just losing its compression ratio) after I get to 100k because the previous owner was a nincompoop and didnt know how to take care of a rotory car. So people are lucky and get good engines, but I hear of a lot who dont, so I dont want to prep the car just to need a new engine soon anyway. So I guess my question is will new seals (+ a tune) solve most compression ratio issues?

j9fd3s · 07-15-2011, 02:08 PM

if you go and look at the japanese tuner websites you'll see that an engine rebuild to closer tolerances is stage I for the Rx8. the factory engines are either a little sloppy with seal clearances, or worn; take your pick

stage II is the ECU tune, with an intake/exhaust.

stage III is the turbo/supercharger, depending on the shop.

due to the "cut off" seal, which is needed for the side exhaust ports, the Rx8 rotors are the only ones that will work in the Rx8 engine. with FI the tune and selection of parts is important.

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07-14-2011, 09:54 PM	#1
LiveWire The Newbie Join Date: Jul 2011 Posts: 10 Rep Power: 0	I heard the rx8 13bs dont take well to forced induction because of high compression ratio and lightweight rotors, so my solution was the superdense (I believe thats what they are called?) rotors and a tune. Is this incorrect? I was thinking ceramic to hold up better at high rpm? (another assuming info is correct) My plan was to basically prep the stock rx8 13b for FI down the road and this FI would be tuned for high rpm boost, since the rotories do well in high rpms anyway. haha I have accepted the plague of low torque at low rpms, it does not bother me too much. Anyway as for the 100k+ miles, I just dont want to get a used car and have the engine "fall apart" (I do understand its not literally falling apart rather just losing its compression ratio) after I get to 100k because the previous owner was a nincompoop and didnt know how to take care of a rotory car. So people are lucky and get good engines, but I hear of a lot who dont, so I dont want to prep the car just to need a new engine soon anyway. So I guess my question is will new seals (+ a tune) solve most compression ratio issues?

07-15-2011, 02:08 PM	#2
j9fd3s Rotary Fanatic Join Date: Mar 2008 Posts: 123 Rep Power: 18	if you go and look at the japanese tuner websites you'll see that an engine rebuild to closer tolerances is stage I for the Rx8. the factory engines are either a little sloppy with seal clearances, or worn; take your pick stage II is the ECU tune, with an intake/exhaust. stage III is the turbo/supercharger, depending on the shop. due to the "cut off" seal, which is needed for the side exhaust ports, the Rx8 rotors are the only ones that will work in the Rx8 engine. with FI the tune and selection of parts is important.