Originally Posted by samuri
If a great tune is performed on a Non A spirated Skyline so torque and power are improved 10%, will the SVI LPG ECU ( hope the terminology is correct) adapt itself to the improved petrol performance.
My new Current LPG set up returns poor fuel economy so it will need to be fine tuned by the LPG technician.
How then would a future great petrol tune affect a prior newly fine tuned LPG setup?
LPG is used for saving money, not for tuning.
First problem is valve and valve seats faster wear: lpg has other thermal charachteristics and if you apply high loads to the engine , it would`t lower the combustion chamber temperature as it may be done on petrol (by making a mixture richer)
It happens so, because the LPG is vaporised before the fuel starts to burn, instead if petrol is used in a rich mixture, a part of it vaporisez during the flare.
If you want to make better effeciency, you can apply ealier spark advance by 4-6 degrees on low rpms till 3000. It is better done on dyno(where these 3-5 % of improvement can be noticed). Other modifications are not effecient