Mikami

iTrader: (5)

People have been posting their setups for their 3 rotor rx8s and such and one or two 4-rotors, but does anyone have any idea of the gas mileage these engines get say on average? does anyone who has a 3 rotor engine have any comment on how much their gas mileage decreased after the upgrade?

Are we looking at like 10highway with a 3 rotor
maybe like 2-3 with a 4-rotor

Also things such as how highly modified your 3-4 rotor is would also take into account.

The question isn't as much for cost wise, but more towards, how far can i go in a 3-4 rotor before having to stop to fill up again, Example: 2mpg would be locked to track only, 10 would be more likely to still be street driven.

lol i don't want to be like the bugatti veyron which gets 3mpg, or you can floor it to 250 mph for 12 minutes before running out of a full tank of gas. Over that time it will travel 50 miles and get all of 1.9 mpg <-- LOL

So yeah guys, any information would be great.

bse50

The answer is... it depends.
Gearing, Tuning, porting and turbo choice together make up for more than a 40% difference in the mileage you can get out of the engine

What's your main goal? If you have a trailer this is not a problem. If you have to drive to and from the track you could build an engine and squeeze 13\16mpg out of it on a lightweight car with the right 6th gear.

Mikami

iTrader: (5)

aha well trailer = track limited car,

whats your best guess as to what a well-tuned 3 rotor turbo'd rx8 would get? city/hwy

SleepeR1st

iTrader: (2)

12/18

Mikami

iTrader: (5)

so now the last question,

4 rotor, city/hwy

maybe if you've seen different setups,
separate the gas mileages and differences in setups

J8635621

iTrader: (10)

Do you know how many people on this board have even seen a 4-rotor or even 3-rotor? Not many. I wonder what kinda gas mileage the space shuttle gets? I realize I'll never have the money or ability to own one, but I'm just curious. There aren't gas stations out there ya know.

04Green

iTrader: (1)

I can help with the space shuttle question....

Lousy for the first 10 minutes, then the whole cost at 18,000 miles an hour for 2 weeks really bring the average back up....

TeamRX8

iTrader: (25)

If you can afford to build and install one, you can afford the fuel ...

Jamaalsmith

Hmn...valid question...i've heard upwards of 20mpg somewhere...anyhow...i dont think its a cost thing, i think its more of a practicality thing. Like..."am i going to take the Prius or the 3 Rotor Rx8) on a road trip... :/ lol

bumblebeerx8

iTrader: (7)

That was my thoughts exactly.

ZumnRx8

TEAM- what are you, a Genius?

Turblown

Guy doesn't care what fuel costs, he cares about how far he can drive without refueling. I had a cobra here not too long ago that could only drive 160 miles w/o refueling. He was limited as to what car cruises he could do.

Anyhow 20B is around 18mpg freeway, and probably 16 in the city.

No one here is going to know what a 4 rotor gets. I would assume pretty close to the same..

Just install a bigger fuel cell.

Mikami

iTrader: (5)

thank you turblown for reading previous posts and understanding the whole purpose of this thread.
Still thats not bad mileage. thanks guys, it really helps.

Just a estimated guess, 2 rotor -> 3 rotor -> 4 rotor, fuel consumption would just decrease another 25%-ish due to another rotor being added to the engine, but also, minus the turbo for the 4rotor. the few 4rotor setups mentioned here are setup w/o a turbo as far as i know.

thanks again guys. just wanted to make sure a 20b would still be drivable on the street w/o having to fill up every few exits on the highway lol.

zenrx8

iTrader: (4)

I sort of follow the Rolex Series, and the 20B Mazdas seem to get mileage on par with the other cars in their class. Depending on your drifing habits, I think the 15-20 or less is the closest answer to your question. Here's a result from a quick Google search:

http://www.rx7club.com/showthread.php?t=802950

expo1

Cold rainy day in New Jersey, so I had time to look up a review of the car the 20B was installed in.
The below converts to 14.7 / 22.8 for the 20B in stock tune.

Fuel economy was also a bit of a problem with a hard driven Cosmo, around town, the 20B model would average 6.0km/l or around 16L per 100km and the 13B 7.2km/l (13.8L per 100km). On the highway, those figures improved with the 20B averaging 9.7km/l (10.3L per 100km) and the 13B model 10.5km/l (9.5L per 100km). It was definitely a car for those who didn't mind visiting the petrol station frequently.

Snrub

Rotaries are further from their peak efficiency range at lower RPMs. At high loads a PP engine is reasonably efficient.

zenrx8

iTrader: (4)

That explains a few things.

terch1

iTrader: (2)

Honestly who the hell cares about the fuel efficiency. I wouldn't care if I got 3 miles to a gallon.

Jamaalsmith

I would care about fuel efficiency...driving a super powerful car is cool and all, but when you cant make it to a gas station 3 miles away...3000lbs + gets real heavy