Octaned to the membrane.
Higher Octane Fuel...
MY VR Stato, 5 Litre dual fuel with OTR CAI as the only mod, took it on a trip to Warrnambool from Portland, 200 Km's round trip say, and it did it the world of good and blew out some cobwebs no doubt. Mate I met over there, g'day Ozzie, suggested I try 95 or 98 Octane juice instead of the 91 currently running. Pish posh I thought but still had half a tank of 91 so filled the rest with 95 Octane and drove around a few hours today.
The difference was staggering to be honest, much greater power and engine note and exhaust sound with no loss of economy to speak of and runs no hotter. I used to be young once and remember what a performance car on full noise felt and sounded like and this took me back. I drove with a smile on my face and a shaking head, I must have looked like an escapee from the Dementia clinic!!
Now the trip would have helped, no doubt, but that was a couple of days ago and I had driven the car every day since and noticed little if anything different. Now I am waiting for this tank of juice to empty so I can fill it with just 95 Octane as I swear the performance improvement is amazing. The CAI actually seems to be working as it should now with that deep throaty roar from the donk and the 2 1/2" exhaust which should have sounded hotter is sounding... well hotter now.
Is this how it is for most who try higher Octane juice? Is the difference more noticeable the more powerful the engine to begin with? One thing I do know, you never forget that feeling of having your spine pushed through the back of your seat when stepping on the loud pedal, and man alive have I missed it!!!
"We must all hang together for most assuredly, if not, we shall all hang seperately."
Hand over the dog bikkies
Oh dear. You will get destroyed by the scientists of Just Commodores now because better fuel won't increase performance.
JCCC Warrnambool
no he wont.Originally Posted by wraith
his heads are worked for gas.
Blumpkin
and the RTA regulation professionals, noooo high octane give u canary, as u msut be able to see the the tyre smoke from 200m away not 500m from all that extra power, cus of BSM(bull shit mate) standards
I always use 98 octane stuff.BP Ultimate,Shell V Power,or Caltex Vortex 98.I get heaps better economy than I do on the 91 octane rubbish.I drove to melbourne recently (1200km each way)and using 98 octane fuel there and back I got 33 miles to the gallon or around 7 litres per 100 km.Cost around $170 each way.I was expecting it to cost a bit more than that.I wasnt driving slowly either,but wasnt exactly breaking any records either,sitting around 110,or 120 on the freeways.Mine is a V6.
Last edited by Brett_jjj; 10-03-2010 at 09:49 PM.
JCCC Warrnambool
you havent drivn his stato nor even seen it so stfu!
Octaned to the membrane.
Well Wraith if that's how they get their jollies then I'm an easy target so they can, in the words of The Rock, "Just bring it". Differences of opinion are always to be respected of course, life would be dull if everyone agreed on everything.
G'day Ozzie mate, yeah should have mentioned that as well probably, lol, thanks again for all your sound advice and support, much appreciated.
Hand over the dog bikkies
I like you already. You don't go off on a tangent because some one doesn't share your view's or opinions. That's good to know about that increase though it helps people who are unsure of whether it will work or not decide. Wonder if 98 will be worth the extra though?
Octaned to the membrane.
Yeah I was thinking the same thing, I mean if 95 is so much better than 91 then 98 has to be even more so I guess? Also it has to depend a fair deal on individual cars I would have thought, not everyones ride is the same or runs the same so anything different might not have the same characteristics across the board.
Good lively debate, gotta love it...
JCCC Warrnambool
As your stato has had the heads mildly worked and has been tuned to run gas it is not standard.
********s are comming in here thinking it is completly stock and the higher octane wont have any effect. (maybe their jelous, who cares) With a stock tune it will have minor effect if any at all.
But this is not the case.
Try some of that race performance octane boost i suggested with the rest of the 91/95 mix and see how much better it runs on fuel than the gas
Octaned to the membrane.
Just did some quick calculations on my days tooling around - travelled around 150 Km's city and country driving and fuel economy figures say my car was 1 Litre per 100 Km's cheaper to run today than on the trip to Warrnambool. So on an 80 Litre tank, with the 95 Octane 12 cents per Litre more expensive than the 91 Octane I would still be better off by about a dollar running the 95 Octane, hehe. So given the increased power and performance boost it's a no brainer for me and the 98 might well be even better still. Whod'a thunk it...
Octaned to the membrane.
Sheesh that's good going Brett, 33 MPG is damn efficient and as you said you weren't just plodding along. What is the comparison between what you get on 91 and 98 roughly?
Octaned to the membrane.
Yeah might well do that, give me an idea of what higher still Octane will be like at least. It still runs smooth as Bat crap when running on Gas but when on Fuel it's a wild child fer sure, lol.Try some of that race performance octane boost i suggested with the rest of the 91/95 mix and see how much better it runs on fuel than the gas
i'm running a standard tune on my ecotec, with revised induction, extractors and catback,
in my case, 98RON was a waste of money... it gave me a much smoother idle and that's about it.. maybe slightly better mileage (20kms a tank) but i think the car was a touch less responsive.
95RON however gave me a tad more response, which could have been power, and about 50kms or so a tank, as well as a smoother idle.
i use 91RON daily.. runs fine no probs, guess that's what she's made for.
if ur getting benefits, tangiable from 98, good on you mate..
was disappointed with it in my car.
Around town on say $20 worth, I will get about 20km's further than I would get on $20 worth of 91 octane,even though I get more fuel at the bowser with 91 stuff ,it wont go as far as the 98 stuff will.I tried about 5 lots of each fuel,and the 98 worked out cheaper so thats all I use now.I never fill it up around town either ,carrying a full tank of fuel around in town,with the stopping and going again uses heaps more fuel than say half a tank.30 litres of fuel(half a tank roughly)makes a big difference to the weight of the car and hence its fuel economy.
well what can i say i run 98 in mine coz it wont run anything else coz its charged i would say 98 in a 5L would be a waste of time if it wasnt off its head cammed and charged then use 98 but i wouldnt be looking at runnin 98 in the stato. and gas i love that to i run a 5L on that straight and its a dream and so good to tune it to. hehe cost like 5 10 to get to warny so thats good as.
TURN MY HEADPHONES UP
95 is the sweet spot if you run some kind of tune or advanced timing, 98 isn't worth it unless you have a specific reason to run it. otherwise on a completely stock car 91 is fine
Octaned to the membrane.
Well that's a good enough endorsement for me, thanks Brett.
mechanic at holden said ecotec will get slight improvements in power economy and smoothness from 95, but 98 is a waste of time
The ECU can to a point use the higher octane fuel to increase(advance) the timing,which increases efficiency which means more power and economy(to a point).These engine management systems constantly change the timing to suit the driver input,engine load, air temp and fuel octane (by way of the knock sensors).The ECU advances the timing until the knock sensors detect knock,then retards the timing until knock is not detected.This is constantly happening as the engine runs.Higher octane fuel can be fired earlier in the compression cycle which is more efficient(advances the timing).The lower octane fuel has to be fired later in the pistons compression cycle,(closer to TDC)which gives less efficiency.
Octaned to the membrane.
Yeah well different strokes for different folks I guess, there are no absolutes here and it's all preference really in the end, whatever rocks your boat. As seen by some comments here, some get great results and some don't, just one of lifes little paradoxes... it's all good.
291 hp @ the wheels
You know what.... i actually experienced this the other day too.
My daily car, dyno tuned VN v8 with extractors/ full exhaust, other than that she's stock. runs nice with better performance than stock on just regular fuel. Now the other day it was empty and i was madly short of coin, so i emptied the 15L of 95 that i had in the tank of my old weekender.
First thing i noticed... wow, hang on it started on first go- it never did that?! for the last 6 months every start had required two or three cranks every time and runs rough for a few mins. This time was first go and smooth as.
Still sceptical (possible placebo effect), i drove it how i usually do with the odd thrash here and there. It was definitely 100% better in every aspect.. idle, WOT, cruising. Gave it a flat foot straight line dash and it turned the treads thru 1st and 2nd, never did 2nd on reg unleaded before?? i'm not kidding!
I have always been VERY sceptical of premium or ultimate fuels making a difference in stockish engines, but this test definitely confirmed to me that there CAN be a difference in performance!
Hit me up with some reputation points if i've helped you out! (Star in the bottom left!) Cheers!
GT Performance RUF 231- NA 3.8L- 13.30 @ 103 Mph... So far... Cam, compression and revs! MY CAR>> http://forums.justcommodores.com.au/...tml#post471410
Daily VR SS: http://forums.justcommodores.com.au/...ite-vr-ss.html
Hand over the dog bikkies
Dumster's car always started easier on premium fuels. Even with all it's problems.
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