Optimax (again?)

I know this has probably been well discussed in the past but for the benefit
of me, has anyone noticed any difference in using this over standard premium
unleaded?

Is it worth the extra couple of pence on a tank of juice?

 

Personal experience showed that my Goldwing (When I had it running) ran far
smoother. The SOBeemer also runs a little better, although I haven't really
clocked the mileage difference if there was any on either.
Acceleration and engine smoothness is definitely noticeable, as was
throttle response.
Someone who wants to differ, offer alternative opinions, or just throw in
their 2p worth will be along soon no doubt.


--
--
Robbo
1500GL 1988 Goldwing (Rebuild in process)
BMW K100 RS 1984
"Fairly Quick" status. Silver level
BotaFOF #19. E.O.S.M 2001/2002/2003.
B.O.S.M 2003.FURSWB#1 KotL..YTC449
PM#7

 

I used it once, with the intention of seeing if it reduced carb icing in
the Monster. I wasn't really expecting it to make a difference, but there
really seemed to be a reduction in icing, and seemed to run far smoother.
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I had a Nova GTE that had been fitted with a big valve head by Courtenay -
running the car with Optimax at least one tank in three seemed to make it
much more responsive and torquey.

 

For roads bikes, probably not.

We use it on the race bike cos the compression ratio is pretty high,
and we need the equivalent of four star.

 

MCN said no a few months ago.

 

IIRC, Bear did.

No.

--
Molly

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"Nemo repente fuit turpissimus"

 

*splutter*

 

Molly was seen penning the following ode to ... whatever:

I did on several of my Beemers and noticed a difference inasmuch as
I got a couple more miles out of each tank. The difference was
measuarable, but not necessarily that huge. The also ran smoother as
well.

It makes bog-all difference on the Pan, which is as happy on the Tesco
juice as it is on Optimax.

The Bimota likes it very much, but that maybe due to the unspecified
tuning Bimota did to the engine.

Cage-wise, the ShiteOldRover likes it due to the octane rating (it's
got the five-star specific engine), the RX-7 gets it or similar
higher-octane juice due to the fact that it's turbocharged and when
you notice the difference on that engine, you can go buy another
one...

Not unless you need the octane rating IMHO.

 

Cerberus let forth with a mighty belch and uttered :

Tried it in a ShiteOldRover 414, I think it confused the crap out of the
MEMS as it ran like a bag of nails for half the tank, then got back to
normal. Ran really well when it was refilled with Tesco Finest unleaded.
No, I have no explanation for that.

Tried it in the 600f. It ran noticeably rougher. Again, smoothed out when
refilled with Tesco fuel.

Read a comment that it seemed to help combat carb icing. Filled the GTR with
it. It made no difference to the carb icing whatsoever. The bike was no
more and no less responsive than it is on its usual diet of Shell or Asda.
No difference in fuel consumption either.

In my experience, no. Your mileage may vary ( sorry ). It is unlikely to
hurt your vehicle, so why not try it and then report back?

 

I thought standard un-leaded was the equivalent of 4*?
--
Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
Alfa 116 Giulietta 3.0l (Really) Sprint 1.7
Triumph Speed Triple: Black with extra black bits
www.cuore-sportivo.co.uk

 

Nope - unleaded is 95 RON, and 4-star was 97 RON.

Super unleaded is 98 RON.

 

A ringing endorsement if I ever heard one...

FWIW, I was sure I noticed a difference when I had the ZZR600, but I can't
tell on the Blackbird, especially not since the carbs were stripped and
cleaned during the 8k service.

 

In uk.rec.motorcycles, Steve Brassett said:

So Super Unleaded is better than Optimax?

I thought I noticed a difference when I accidentally filled up with SU
one day...

 

Carbs?

How quaint.
--
| ___ Salad Dodger
|/ \
_/_____\_ GL1500SEV/CBR1100XXX/KH500A8/TS250C
|_\_____/_| ..62743../..14835.../..3157./.19406
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|__|_|__| BOTAFOT #70 BOTAFOF #09 two#11 WG*
\ |^| / IbW#0 & KotIbW# BotTOS#6 GP#4
\|^|/ ANORAK#17
'^'

 

Optimax[1] is a brand of super unleaded.


[1] Shell's?

 

In Sean triped:

But MEMS is a closed loop fuelling system that adjusts the fuel delivered
according to the O2 level in the exhaust gases (I know, cos I used to work
on it!); the fuelling calculation was performed on each cylinder
individually based on parameters such as speed, load (determined either by
manifold pressure or air mass measurement), temperature, ambient
temperature, etc. with aditional fuelling being added to account for
transient demands, i.e. driver applies welly!.

Neither have I!

 

Optimax is Shell's, and they claim it is better than SU,
with a higher octane rating. If you google for optimax
petrol, there is a website that tells you all you could want
to know.

 

In uk.rec.motorcycles, Steve Brassett said:

fangu. I'll have a lookski when the volcanos have finished on channel 5

 

Andy Ashworth let forth with a mighty belch and uttered :

I'm intruiged now. Does the MEMS feature a knock sensor?, does this Optimax
stuff play games with the O2 sensor?, roughly how long would it take a unit
to recalibrate if it didn't get its usual O2 signals?. Does it advance the
ignition until it detects the beginning of knock then hold/retard the
advance?. I'm curious as to how it calibrates.

Maybe it cleaned the injectors out. The last couple of gallons were consumed
in an Italian tune up on a late night run down the motorway. Actually, that
probably did more for it as the car was used mostly as 'Dads Taxi'