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Supercharging an 1800ES

I noticed that in your response to someone wanting info on a V8 conversion you mentioned using a Paxton supercharger to get streetable HP without chopping up a classic Volvo. Now having learned a little about the D-Jet, it seems that this system would be a likely candidate for supercharging.

In the D-Jet, as absolute manifold pressure decreases, more fuel is injected. If the MAP senses vacuum accurately, then why not a mild boost? The MAP is essentially a barometer that sends an electronic signal. Supercharging might be accomplished without complex air mass meters and fuel pressure regulators.

My ES has A/C, which is not a necessity in Seattle, so I already have a bracket for a supercharger and, more importantly on an 1800, room for something else under the hood when the A/C is removed. Pressurized air could be routed out in front of the radiator from the driver's side, through the old A/C radiator (modified to allow air to pass through the system ala an intercooler), into the stock air filter, and right back into the stock system.

I've been reading some of the Mazda Miata sites, as they seem to be the only ones now heavily into supercharging (aside from muscle cars). Would it be possible to request info from your readers about supercharging Volvos? If there is an experienced group out there, I'd like to hear what they have to say. Turbos are fine for the newer Volvos, but the older technology might suit me better.

Phil and David say: After having given this a lot of thought and discussion, the short answer is "no, it won't work." The major problem is that the pressure sensor will only work on vacuum, not positive pressure, and we can think of no way to adapt it so it will work on pressure. The D-jet system is not adaptable to super- or turbocharging.

We still think supercharging has possibilities for a carbureted motor or a K-jet, which matches fuel delivery to airflow, not manifold vacuum. Sorry!

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