B16B -> B18C-R fuel usage


I

ikelfkens

New Member
Joined
Oct 27, 2008
Messages
65
He there,

I just recently swapped my EK9 to an B18C-R. The new engine is a real good one (for as far as i can see) It doesn't use any oil. Realy nothing. It runs very smooth and thara are no weird sounds. I am running it on the stock 2000ITR map that comes with the Hondata S300. Also i have a Mugen twinloop, Vision Decat, Toda header, Mugen airbox and a hondata imf gasket, NGK HT leads, PLX SM-AFR module and a Bosch Wideband newly purchased 6 months ago.

The thing is that i have had pretty high fuel usage, 20 miles to the galon or 7.5 km every liter, on the B16B and now on the B18C-R. I was thinking it could be a faulty Wideband sensor but the hondata gives a near perfect AFR. im not driving the car on its limits every mile btw... just normal running with the occasional vtec

What steps are to be taken to check what could cause this?

Any ideas are appreciated.
 
Last edited:
What are your afr readings when cruising ? Also out of intrest full throttle ?
 
13.5 full throttle is fine for a na car. When your cruising does it keep bringing you afr to 14.8 ?
 
GroteFoto-WNFDGKO8.jpg
 
It should be better under normal driving.... Mine certainly is. But WOT should be worse...
 
Well. It was more of a try out. Will mapped it online in england while i was driving it in the netherlands :)
This is in open loop... This is not the final map btw... And this is with the B16B in it...

I drove with the B18 yesterday and found out that it was realy running rich.

1:13 in the easy throttle part and 1:12 in the heavy throttle part...

Will also helped me out on checking the Lambda. I did a check on the L.volt with wideband disconnected. It gave 1.35V on the PLX exactly. so that is al ok. Il have it tuned in Januari. I hope it is better then.

Any other reasons why it could be high up there?

so far i was thinking about:

- Sticky brakes
- Lambda broken
- Offset voltage Hondata -> PLX not ok
- map to rich (it is the standard 2000 ITR map) because of mods
- heavy foot
- driving short city trips (i do)
- .......
 
Last edited:
The B18c engine needs to be tuned! The b18c basemap you are now using will never be ideal.

1.35v is that a typo? plx widebands should give a steady 2.35v on wideband signal! Wideband signal MUST go into ECU pin 10.
 
Last edited:
my mistake... its a steady 2.35V

Al connections are checked by us the first time we had contact :) so this should be ok. Ill let it to tuning then...
 
You must log in or register to reply here.
Back
Top