stock compression LS1 ?
Thread Starter
TECH Regular
Joined: Oct 2006
Posts: 417
Likes: 1
stock compression LS1 ? couple of questions if anyone can help, whats the stock Ls1 compression and also what (generally) is the grade of pump fuel in the USA out of interest that they run on?
trying to work out what octane rating fuel to run it on here in the UK, as our RON rating isnt directly comparable to yours i believe? i can get 95 octane, 97 or 98. dont want to see it detonating if i run our cheapest grade 95 octane thats all. i have an msd timing box with the 6 timing pills to use.
hope this is the right section for questions!
thanks
chris
trying to work out what octane rating fuel to run it on here in the UK, as our RON rating isnt directly comparable to yours i believe? i can get 95 octane, 97 or 98. dont want to see it detonating if i run our cheapest grade 95 octane thats all. i have an msd timing box with the 6 timing pills to use.
hope this is the right section for questions!
thanks
chris
Thread Starter
TECH Regular
Joined: Oct 2006
Posts: 417
Likes: 1
thanks for that. i'll try and find out how 91 octane in the US compares to our 95 or 97 octane. we aren't as fortunate as you guys on petrol prices for these big v8s! :-)
98 octane near me is £1.12 /litre eeeek!
98 octane near me is £1.12 /litre eeeek!
Thread Starter
TECH Regular
Joined: Oct 2006
Posts: 417
Likes: 1
optimax (98 octane) good stuff has been £1.19 a litre recently in some parts. my Celica GT4 is mapped on that fuel, luckily i dont drive it daily. diesel tho is £1.09 a litre today- ouch!
do you guys run 93 octane in highly tuned cars,or just by choice for better fuel?
i've asked on the MSD ignition forum if they can advise what octane their MSD ign units are mapped to as standard
cheers
do you guys run 93 octane in highly tuned cars,or just by choice for better fuel?
i've asked on the MSD ignition forum if they can advise what octane their MSD ign units are mapped to as standard
cheers
TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
Chris I'm here in the UK too.
I always run on Shell Optimax, they say is over 99 octane, but who really knows. I know if i run on regular unleaded of 95 RON I do get some knocking, but then the car learns from the knock and after a few miles doesn't show knock retard.
I think you'd be okay on 95 RON as the car learns, but saying that i always put in Optimax as a safe measure.
Optimax is £1.08 for me, but i guess it depends on where you are in the country.
I always run on Shell Optimax, they say is over 99 octane, but who really knows. I know if i run on regular unleaded of 95 RON I do get some knocking, but then the car learns from the knock and after a few miles doesn't show knock retard.
I think you'd be okay on 95 RON as the car learns, but saying that i always put in Optimax as a safe measure.
Optimax is £1.08 for me, but i guess it depends on where you are in the country.
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Thread Starter
TECH Regular
Joined: Oct 2006
Posts: 417
Likes: 1
hi there! pm'd you!
my worry is the msd ignition unit is not mappable with the version i got, just the basic unit with 6 different curves via timing pills. i do need to know what fuel octane msd used for the timing tables to prevent det on friday. its going to be track use (and quite hard!) so its going to help if i can get away with cheaper fuel than optimax etc.
regards
chris
my worry is the msd ignition unit is not mappable with the version i got, just the basic unit with 6 different curves via timing pills. i do need to know what fuel octane msd used for the timing tables to prevent det on friday. its going to be track use (and quite hard!) so its going to help if i can get away with cheaper fuel than optimax etc.
regards
chris
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