Modified Imperial Horsepower Values

Imperial Home Page -> Imperials  by Year -> 1990 -> Modifications -> Battery Relocation

Here is a simplistic way to calculate (or should it be estimate) the HP of a modified Imperial. These are really lose estimates, and the only sure-way to find the HP of a car is via a dyno test. This should be seen merely as a lose estimate, give or take 25 HP.

Here's how it works. In the left column is a list of modifications. In the middle is a RANGE of HP which it boosts. In the last column you check the modifications you have made. Then you total everything up. To do that, add the lower HP figures first. This is your estimated min. HP. Then add up all the higher HP figures. This is your estimated max HP.

Also, it is assumed that all modifications are done correctly, and the engine is in perfect condition to start with. Also assumed that the A604 is in perfect working order.

Note: Some modifications start with "0" HP improvement. This is because not all modifications work well for everyone. Some with the air box elimination barely notice a difference other then sound, others fell the extreme opposite.

For the 3.3L engine (all 1990 models and some 1991 models):

* This includes having the fuel system upgraded to keep A/F correct- i.e. extra injectors, higher fuel pressure, raising regulator, etc. Also includes having the compression ratio corrected to work, via low compression pistons, etc.

 

 

For the 3.8L engine (all 1992 and 1993 models and some 1991 models):

* This includes having the fuel system upgraded to keep A/F correct- i.e. extra injectors, higher fuel pressure, raising regulator, etc. Also includes having the compression ratio corrected to work, via low compression pistons, etc.

Also assumed is that the fuel, spark plugs, etc are all in perfect condition, and that the body is all stock with min. rust damage.