7 Posts - Page: 1

Which fuel do you run your A Series on?

I was out with a mate driving around the other day and he needed to get some fuel, We stoped in at a BP and he only got a few dollars worth and then drove on untill he could find a shell.

He says BP Ultimate is a better fuel for a naturally aspirated engine and Shell V Power is better for a forced induction engine. This got me thinking... is there a fuel that the A Series engines run better on?

So which fuel do you run your A Series on? will any fuel do or is one better suited to the A Series.
1967 Datsun B10 2 Door.
i run bp ultimate with the lead replacement stuff, i dunno about v-power being better for boosted cars i own a 300zxtt and an s15 and i dont seem to get as many kms out of a tank compared to bp ultimate. when we used to race karts shell v-power tested a higher for octane than bp-ultimate  so i dunno i just use what ever i get the best mileage out of
Current Dato -
68 B20 ute project
Previous Datos -
68 B20 ute
68 B10 2dr sedan
ca18det 1200 ute 180rwkw
12a montser port 1200 ute 212rwhp
Stocko 1200 wagon
I use bp ultimate but it really comes down to what sort of compression ratio you have. The new e85 ethanol blend fuel is a real treat for boosted engines, I wouldn't mind giving it a go on a high comp A-series.
I have been trying to find that e85 stuff, seems like it's pretty rare currently and only is really available in a couple of places around Australia. There is intention to bring in more pumps though.
I have been reading about it though and there is some rumour that it kills fuel systems by being hygroscopic (water absorbing). Not really sure if this is true or not. I would love to run it for some really high compression.
There is alot of talk that it attacks the rubber lines and some alloy(?). Which is bullshit if you've got quality fuel specific line in place.

Being hygroscopic, and being a risk (because of that attirbute) are two pretty different things. Most of the moisture issues are asscoiated with marine environments seeing as their tanks are typically of large capacity and they work in a wet environment you tend to see alot more water around the place.

In the instance of cars, if you're having your fuel sitting for months on end in a large capacity tank then sure, you run a risk of developing moisture content which can develop into corrosive issues. But running it in a standard car which doesn't sit for ages and uses a tank fairly regularly won't be an issue (good to have seals and everything up to scratch).
Talking about pump fuel im a fan of the shell over the bp because of personal experiance in my own car,Engine was the Fj20et,The car was tuned at Dyson rotary on bp ultimate and made good power but told me to come back for a tune on the shell and i was able to put alot more advance into the timing on this fuel which resulted in 46hp at the wheels,as for economy im not sure never compared.As far as i understand optimax is a more dense fuel which i would think would lend itself to be a good attribute for forced induction or huge compression.Also i dont know if ive got the placebo effect happening but my xr6t i drive at the momment seams to have an edge on the shell over the BP
Had Dattos
200b x 2
1500 ute L20b 45mm webbers
1200 ute FJ20et 11.5@124.90 mph bad 60ft Built by me and Beetwenty
stocko 1200 ute
1000 ute project gone to a better home
My last A-series daily was a bomber a12 with reasonably high compression.
 
I honeslty couldnt find any difference in fuels even standard 91 octane upt to BP ultimate (98 octane).
 
Its quite likely that on paper it should have made some difference, but it was not measurable.
Economy was the same, it certainly didnt go any faster. For me  its a moot point.
 
The only time that I got more power and top end speed that seemed noticable enough was on an icy cold night on a flat straight run. (At 85 mile there is NO steering feel!!)
 
If youthink about ratio of power gain.
An a10 standard makes 62hp. A 10" gain takes it to about 68hp. Thats not a huge jump. Unless you are getting 30%+ gains, i reckon you struggle to feel the difference in the real world, where it counts.
 
Sure a dyno result "can" show differences, but there are too many uncontolled variables to anyone to make a certain determination. We all know each dyno reads differetnly, so what does that tell you about their realibility.
 
With all than in mind, I used to run premimum (95 octane)in Daisy, just cause I could,  and it only cost an extra $1-2 filling her up.
 
 
7 Posts - Page: 1