- Wed Oct 10, 2012 6:43 am
#317618
Getting anything beyond 87octane is a waste and can only do harm on a D15b7.
In my Sedan I had a D15b7 and a 96-00 Civic HX Tranny(similar gearing to CX,VX Gearing). It worked okay but was gutless. When I swapped out my d15b7 out for a D16z6 I got a much peppier car, as well as Better MPG's. I got over 50mpg multiple times on the freeway.
In my old 93 Sedan DX I had a D15b7 and a 96-00 Civic HX Tranny, Which has similar gearing to a CX or VX Transmission. It worked and got me decent MPG but was gutless and no fun at all. Once I did a B20 swap to my Delsol, I took out my Stock D16z6 with 191,XXX miles on it and put it into my Sedan. It was so much better. It was much much peppier, it also get better MPG's.
I Left the Stock d15b7 ECU in the car, I also didn't wire up vtec as all this civic did was shuffle me around. With no real changes to driving style I got better MPG's, both in town and on the freeway. On pure Freeway driving I got 50+ MPG.
This is with heavy 16x8" wide rims with somewhat sticky tires on it. Right next to my Eibach lowering springs, and my Acura EL Leather seats the D16z6 was the best mod I ever did to my sedan.
This was all done on Washington State 87 octane fuel, The same as the contential 45state blend(CA,NV and AZ get worse fuel as they want to save the planet)
When i had my sedan I bought fuel at Chevron, Texico or Shell. Currently in my WRX i only buy Chevron or Texico fuel as I get bonus points for using a Chevron gas card. Stay away from Arco, they have a high sulfer content and will ruin fuel injectors.
Highlights for the lazy:
- Got better MPG swapping out my D15b7 for a D16z6, Running on the b7 ECU and no-VTEC.
- Easily in the top 3 best mods I did to my Sedan
- Got 50MPG on pure freeway driving multiple times. Good MPG in-town as well, Dont remember the figure, In the 30's.
Suggestion:
- Swap out to a more powerful and torquey D16z6, It gave me better MPG's.
- If you have not already, Get lowering springs or adjustable coilovers so you can take turns without having to slow down
- Drive calmly, I never drove my Sedan fast as it was pointless, a D16z6 with a HX Tranny wont beat anything, maybe a smart car but that's it. I had a Second car for my crazy driving.