Great response with 100 octane, need tuneing??

[MIRZ]

i have Honda Accord CD5 1994~95.

According to book it should use 95 octane (regular unleaded) fuel.

yesterday i tried Shell 100 Octane fuel in it (full tank with only 100 octane).

response on both accelration and decelration is too good now. i am feeling like driving a totaly new car.

what does this mean? its engine should be tuned for 95 octane and should give similar response on 95 octane.

someone told me 100 octance can damage engine fuel sensors, so dont try it again.

do i need to take my car for engine re-tuning? its 211,000 kms driven and bought it when it was 82,000 kms. i never took it for tuning.

what would you suggest? how much Honda charge for tuning (approx $$)

thanks in advance.

[teaseR]

tuning or servicing?

[aaronng]

Why don't you just use 98 octane instead? The seals in the CD accord might not be ethanol-resistant.

[destrukshn]

please tell me you've serviced it in the past 130,000kms.
=/

[MIRZ]

oh yeah, forgot to mention this 100 octane has 5% ethanol in it (thanks aaronng).

i will try 98 octane next time once tank would be close to end (dont wanna make my own blend with half of 100 and half of 98 octane).

and i am using NGK iridium spark plugs for last 6 months (claims to last for more than 2 years or 50,000 kms)

my understanding was that these new cars dont realy need tuning. so not sure and bit confused about this re-tuning thing.

is it true to re-tune new cars? how often it should be done.

[MIRZ]

on 10,000 kms took it for cambelt replacement service and after that took it for service at 120,000 kms.

since then i am replacing engine oil and filter on every 5,000 kms, and transmission oil on every 20,000 kms. spark plugs on every 20,000 kms. but this time got NGK iridium, so planning to run it on for 50,000 kms on them.

if you are asking service form dealer, noop.

[aaronng]

As long as you changed the engine oil and other fluids, it's fine.

But in terms of tuning, all you do is maintenance items like fluids, belt, dizzy. The engine electronics will take care of the rest.

[EuroDude]

You should use 98RON instead, 100RON (ethanol) is actually less fuel efficient, plus it may play silly buggers with your engine/fuel seals

[EuroDude]

EDIT: i should add that the better performance you are feeling from the 100 RON fuel may just be a perception thing, there might not actually be any benefit.

True. Although 98/100RON has fuel additives that may have cleaned the fuel injectors etc..

[aaronng]

the 5% ethanol should be perfectly safe, my understanding is that you need a much higher concentration before it starts to be a problem. And its a problem only on some cars.

Also, regular unleaded is 91 RON, not 95. Premium is 95.

Dont see how the 100 RON will damage any sensors either. The oxygen sensor will have issues with leaded fuels but i'm not aware of any issues posed by any unleaded fuels.

Honda's statement is that only cars from 2003 onwards are safe to use ethanol in their fuel.

[EuroDude]

Honda's statement is that only cars from 2003 onwards are safe to use ethanol in their fuel.

Very true ~

All Honda vehicles should use the fuel recommended in the Owner's Manual. The following models will operate satisfactorily on E10: Insight - 2004 onwards; Civic range (including Civic Hybrid) - 2004 onwards; S2000 - 2004 onwards; CRV - 2003 onwards; MD-X - 2003 onwards; Accord & Accord Euro - 2003 onwards. Honda does not recommend E10 for other vehicle models because there may be drivability issues.
Source: http://www.abc.net.au/brisbane/stories/s1466787.htm

[MIRZ]

True. Although 98/100RON has fuel additives that may have cleaned the fuel injectors etc..

so this means fuel injectors should be cleaned too after some sort of regular intervals?