Hey Everyone, As you may remember I'm building a 10 second vl using rb26head on a rb30 block with forged rods and pistons, and a gt35/42. Unfortunatly in tassie you can't get anything higher than 95 octane fuel so I have to settle for either less boost or less compression . However I read on a website that lpg has a higher octane (100 I think?) so more boost can be run with a higher compression(the 26 head would also help to prevent detonation, wouldn't it?). Also there was a vl in a recent street comm. magazine that had an 11sec lpg fed motor. Can anybody see any reason why this sort of power couldn't be made and how well can lpg be tuned cause I like a smooth idle? Sorry for all the questions, cheers, Daniel. Some original photos have not been recovered yet.

dont mean to be nit-picky but that was a VC Wagon wasnt it? Not a VL...? and i have no idea about all this so would you mind explaining the compression and octane etc.? if its too much a pain then nevermind, its just :-)... im new to this car **** sorry if i sound like a ****head here. -stew

build ur car as per usual, like anyone else would. on the street with low octane fuel, cut the boost off at a safe level or tune around it. As for the strip, u wont be using pulp anyway, so just build the car as u would normally. and some C16 will take care of the fuel issue come 10 second time. Some original photos have not been recovered yet.

ollie is right, if you're looking to make it into the 10 second bracket you will NOT be able to run 95 octane fuel. program two separate fuel maps into you ECU and run C16 at the strip, ULP on the street.

Hey guys, cheers for the comments so far. HRTstew89: basiclly you can only run a small amount of boost/compression with 95 octane. If you want to use optimax etc, you can run more boost with a higher comp. ratio. however if you stay naturally aspirated then you can run a lot higher compression with the same fuel....can anyone explain this a little better??

Use less boost on 95 octane and more boost on c16(or something similar) You'll have 2 fuel maps but you cud get away with one(2 would require after market computer) if you don't boost it much or just retard the timming. If you retard the timming to offset detonation u can run more boost. You will have more lag but the boost will make up for that. You can't change the compression ratio but you can change boost. different boost settings give you different compression ratios but(Like running around 1 bar will give you double the compression.) A N/A has 9:1 compression ratio but a turbo has 7.8:1. If the turbo is on 1 bar of boost(14.7psi) then in theory its compression ratio is 15.6:1 Hope this makes sence.