whats the diff betwenn jap petrol and the stuff here

eire1990

iv heard people talking about this when impoting cars for japan they say it wont be as powerful here as in japan do they have a higher octane petrol over there and why cant we get it:mad:

Atomic Pineapple

eire1990 wrote: »

iv heard people talking about this when impoting cars for japan they say it wont be as powerful here as in japan do they have a higher octane petrol over there and why cant we get it:mad:

Better grade higher ron petrol allows engines to make higher bhp figures.

I presume we dont have it here as it would be more expensive and theres no demand for it, although Maxols E5 is now a claimed 99ron which is too bad.

Jap petrol is 100 - 104 ron

colm_mcm

my JDM FTO ran smoother on Maxol E5, fuel economy was increased too.

Some cars have major issues running on lower octane fuel (I'm thinking Subarus)

Atomic Pineapple

colm_mcm wrote: »

my JDM FTO ran smoother on Maxol E5, fuel economy was increased too.

Some cars have major issues running on lower octane fuel (I'm thinking Subarus)

My ukdm Teg runs better on the E5 too, although economy goes down.

Most N/a cars will have no problem, just lose 5 - 10bhp but turbo cars can have serious trouble

Graham_B18C

draffodx wrote: »

My ukdm Teg runs better on the E5 too, although economy goes down.

Most N/a cars will have no problem, just lose 5 - 10bhp but turbo cars can have serious trouble

This E5 stuff, is that just Maxol's general fuel? Or is it that 85% Bioethonal stuff?

hi_im_fil

E5 is available in most Maxol stations. It is 5% ethanol and any car can run on it. Details on where sells it are here http://www.maxol.ie/general-content/e5-stations.html

E85 is only available in a few and is 85% ethanol. The car has to be set up properly (new injectors and map) to run on this.

JimmyCrackCorn

About 5- 9 octane points.

The exact answer is here(if you want to get your nerd on):
http://en.wikipedia.org/wiki/Octane_rating


As for the not being as powerful as here that's car dependent,oversimplified and not necessary true.

cian1500ww

Can't you add something to the petrol to improve it's octane ?? I'm sure I heard some of the rallying lads on about it.

Atomic Pineapple

cian1500ww wrote: »

Can't you add something to the petrol to improve it's octane ?? I'm sure I heard some of the rallying lads on about it.

Octane booster but in reallity its useless

cian1500ww

draffodx wrote: »

Octane booster but in reallity its useless

Sounds like the stuff, I know a lad who rallies a Mk.2 escort and he always adds some sort of stuff like that to the petrol for it, tuned to run on high octane stuff afaik.

JimmyCrackCorn

cian1500ww wrote: »

Sounds like the stuff, I know a lad who rallies a Mk.2 escort and he always adds some sort of stuff like that to the petrol for it, tuned to run on high octane stuff afaik.

Lead replacement for unleaded heads Or Octane boost.

Octane booster is almost useless. The Subaru legacy owners club recommend something a while back that worked.

E5 is usually close enough to 97 octane according to AI auto-sports tests.

Tourmaline works but may kill you plus you would not get your hands on it at the grade or volume you would need as it is a listed hazardous chemical.

cian1500ww

JimmyCrackCorn wrote: »

Lead replacement for unleaded heads Or Octane boost.

Octane booster is almost useless. The Subaru legacy owners club recommend something a while back that worked.

E5 is usually close enough to 97 octane according to AI auto-sports tests.

Tourmaline works but may kill you plus you would not get your hands on it at the grade or volume you would need as it is a listed hazardous chemical.

Yeah I use the lead replacement myself, that E5 sounds like the stuff. Must make a difference otherwise they wouldn't be using it.

JimmyCrackCorn

As i said it depends on the car, engine management, Timing , Fueling.
No simple answer.

I could say yes or no but i wouldn't believe me unless i had dyno sheets as proof.

Atomic Pineapple

Lucas Octane booster is supposed to be one of the best but even it seemed to only add around 0.2 - 0.3 ron to a tank full of petrol so at €15 a bottle it expensive stuff!

Flesh Gorden

One device I've heard mentioned is the Broquet Fuel Catalyst, a device that will allow older cars to run on Unleaded
or modern engines designed to run on higher octane fuel to run safely on poor quality or lower ron fuel

http://www.broquet.co.uk/facts.htm


Found a thread here about it's use in the P1 Impreza to safely run on 95Ron

http://bbs.scoobynet.com/scoobynet-general-1/2928-broquet-fuel-catalyst-p1-wrx-stis.html


.

Armin_Tamzarian

draffodx wrote: »

Octane booster but in reallity its useless

I've used STP Octane Booster in the past but didn't realise it was useless.
What's the problem with it?

Could aviation fuel not be used?
AVGAS is 100 ron.

Atomic Pineapple

Armin_Tamzarian wrote: »

I've used STP Octane Booster in the past but didn't realise it was useless.
What's the problem with it?

Could aviation fuel not be used?
AVGAS is 100 ron.

Its not useless per say I just dont think 0.3 ron increase is worth €15 everytime you fill your tank

bigbadbear

Here's fifth gears take on it

http://www.youtube.com/watch?v=dDHwCWdrtdg&feature=related

Armin_Tamzarian

draffodx wrote: »

Its not useless per say I just dont think 0.3 ron increase is worth €15 everytime you fill your tank

I didn't realise that it only boosted the octane level by such a small amount.

My car is still running off the original Japanese setup so it's probably set for 100 ron or so.

I used to be really concerned that running it on 90 ron could destroy the engine but apparently not.
http://www.supras-ireland.net/phpBB3/viewtopic.php?f=22&t=729&p=4024&hilit=ecu#p4024

I've had 90 ron in it plenty of times and no harm has been done.
I do try to use E5 which I've heard is 98.2 ron.
If I can't get it I use STP Octane Booster but I think I'll give up on that stuff now.

JimmyCrackCorn

Not all cars have good knock detection and can back off the timing to prevent detonation.

Its down to the engine management on that make and model.

Some cars will be fine some cars will need a cas or crank sensor retardation or remap.

Forced induction is far more sensitive to knock, pre-ignition and detonation.

JimmyCrackCorn

Worth a read if ur nerdy

http://autospeed.com/cms/A_111420/article.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+AutoSpeedArticles+%28AutoSpeed.com+Performance+Car+Magazine%29