Can B18C2 use RON91 fuel?

**dsp26** · 08-07-2008 05:31 PM

^^^yeah.. i wouldn't risk it despite some people fluking not having probs.

but then again 95oct is a factory safety thing because of slightly higher compression than most other cars which are under 10:1.

you'll get more mileage than on 91oct anyway.. worth the extra 4c per litre over 91oct.

**defect** · 10-07-2008 11:20 AM

me either, im just telling you what i've seen others do
he's car is still running fine. though it would probably shorten the life of the motor.

**VTECMACHINE** · 10-07-2008 11:34 AM

Originally Posted by defect

he's car is still running fine. though it would probably shorten the life of the motor.

So in the long run, it'll most likely be a more costly exercise.

**dsp26** · 10-07-2008 12:59 PM

i don't even know how you guys do it.. i was running ethanol blend 93oct from mobil forgetting that minimum for b-series is 95oct.. it noticeably runs like shit and gets inferior mileage.

**Limbo** · 11-07-2008 01:40 PM

i beleive the ECU runs in limp mode, when you run crap fuels.
my 20v did that when i ran normal fuel, and then the engine light kept coming on when i hit high load

**aaronng** · 11-07-2008 03:11 PM

Originally Posted by specialst

hi everyone

noob q's for the noob forum.

Context:
in australia we have the B18C2 which we all run RON98 with.
yet in USA they have the B18C1 (equivilent motor to b18c2).

In USA, the minimum Premium Unleaded RON is 91 (Regular Unleaded = 87 or so). And B18C1 owners DO pour 91octane in their B18C1.

The Question:
- Can we B18C2 owners also use RON91?
- We just wont feel the performance of RON98 right?
- Any risk of detonation n blowing the motor (stock motor)?

Cheers boys and girls

One problem in your logic. The US don't use RON. They use PON (pump octane number). Their 87 PON is our 91 RON, 91 PON is 95 RON and their 93 PON is our 97 RON.

So when the guys on the US forums say they use 91 octane, the equivalent here is the 95 RON. So in essense, they ARE using premium.

**Limbo** · 11-07-2008 03:23 PM

good work aaronng - that explains alot as to why they say they run 91 in their turbos, without problems

**aaronng** · 11-07-2008 03:37 PM

In case you guys want to know more about RON, PON and MON and how to covert, there is a table in this link: http://www.btinternet.com/~madmole/R...RONMONPON.html

**dsp26** · 12-07-2008 08:26 AM

Originally Posted by Limbo

i beleive the ECU runs in limp mode, when you run crap fuels.
my 20v did that when i ran normal fuel, and then the engine light kept coming on when i hit high load

pretty sure honda's don't but thanks for that explanation.. explains why my mates 20v kept idleing rough, stalling and doing weird shit around a certain rpm.. and this was using United's Boost 98oct with 10% eth....