ive been researching the 20b for a non-rx7 based project, and ive found all the information i need, except im curious about one thing. the fuel economy.

what are people getting on naturally aspirated 20b's? what about turbo 20b's?

thanks for any information anyone can give.

 

Fuel economy...you are joking right???

 

thats a legit question

 

about 13mpg with 1680cc and 850cc injectors

 

N/A i got around 13 and even upwards of 16 if i was nice to it! Stock sticks all the way around.



...but i laugh too every time i see one of these threads.

 

Im getting about 6 atleast it seems that way cause if i drive it have to fill it every other day.

 

What are your afrs at highway cruising speed?

 

who cares, no one buys a rotary for gas mileage

 

I care. There is no benefit to bad gas mileage and there are other sports cars with much better BSCF out there (and other engine swaps LS1). If people are getting **** poor mileage I'm sure those that have not committed to doing a 20b swap yet might like to know about it.

 

Some of us are just too damn lazy to tune the excess fuel out. Cruising down the road the other day i was in the 12 afr range and I said to myself, "I should do something about that" and did I? Of course not.

 

before I parted my cosmo out my fuel mileage was 3.5 km/litre with the stock turbos, and a FEED high boost computer. funny thing was it didn't matter how I drove it, if I had AC on or off, it was always around 3.5

when i changed to the IHI turbo setup it dropped to about 2.7~3 km/litre and it became very sensitive to how I drove it, but that was with about 600 RWHP too so it was to be expected.

kenn

 

I am not positive but last time I checked it was about 14.7 when doing about 80mph being good down the interstate.

 

i have a 13b i do 22 mpg !!!! na just kiddin yeah right i wish the best i have done is like 13 maybe 15 lol

 

A 12 afr is damn good. any leaner and your sidking it bud.

 

Risking risking too much 116 octane

 

But at cruise? Cruising is safe for up over 15-16 afr.

 

mine was tuned like stock, 14.7 afr until 1psi, 19.9mpg highway, 14-16ish mixed...

 

I'm sure that guys that can afford a 20B aren't too worried about the fuel economy. No offense or anything. You pose a real legit question. But if you're worried about it, you might not want to get it

 

Yep. couldnt have put it better