Friday, Aug 18, 2006 at 09:58
Bobthe
I have not come across a turbo-charged Nissan 4.2P, but the turbo-charged petrol 4WD engines I have had experience with all have the characteristics I have already mentioned. The simple fact is that a turbo chargers function is to deliver more air through faster flow speeds and compression to the cylinders. If you have a carburettor as this increased volume of air flows through it, it will draw more
fuel to achieve the stoichiometric ratio for petrol/air. The same basic thing will happen with a
fuel-injected vehicle but the MAF sensor or oxygen sensor depending on the vehicle will pick this up and deliver more
fuel to achieve the same ideal ratio. The end result is the same, more power and increased
fuel consumption. Also if your engine has more than 100,000km on the clock you may want to get it thoroughly checked out before turbo-charging it, as this will put extra stress on the internal components, and depending on the state of your rings may pressurise the crank-case which is not good. With a turbo-charger having more bang in your cylinders will raise the heat-load that the cooling system has to cope with, but as long as you current system is okay there should be no problem here.
I am not trying to give a personal opinion, just unbiased technical facts allowing you to make a more informed decision, I assume this is what you were after when you asked the question on this excellent
forum.
Cheers
Snowy
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