Dear Philippe,
Hey I finaly got the 840 done. If its ok I am sending you some technical pictures first and then I will send you pictures of the car.
The photos are the ones I sent to ESS superchargers per our agreement to try and build a kit for these cars.
This is the first in the US.
Thank you for your response. I am going to list the modifications and my cost which does not include labor.
My original 4.4litre motor blew up by melting a piston during a lean condition using nitrous. The kit is not necessarily at fault, but when I hit the button off the line it spun out very hard and automaticaly shifted into second. To soften the shift the ECU reduced timming and fuel and leaned out cylinder number two. Unless someone can alter the programing for nitrous oxide I do not recomend this as a reliable method of power. In the process my block was scored and ruined by the piston breaking. We bored the block one millimeter and used US CHROME to re-impregnate it with Nikasil, a better performance option.
Cost $1800
The pistons were one off and built by WISECO for this application. They are forged and have ceramic coated tops as well as polydysalfide coated skirts. These pistons reduced rotating mass by almost one pound and are superior to the cast original pistons. All rod and main bearings were also coated with polydysalfide compound for reliability and friction reduction.
Cost $1300
We have found that under high loads the crankshaft of a 4.4 has a tendency to shift back and forth due to the main bolts used by BMW. We have corrected this by using RACE WEAR STUDS to hold the crank in place.
Cost $300
The heads were sent to EXTRUDE HONE where there process takes all the imperfections out and makes them as smooth as glass for high flow. 4.4 heads are very efficient except for the exhaust ports which we increased by 6 millimeters. Furthermore, we installed a set of M60 cams which have 9.6 millimeter lift. The cams required some machining to fit.
Cost $800
The exhaust was treated to Supersprint Mufflers and all headers were radiused for increase flow.
Cost $1200
The supercharger kit was from a 540 application and was done by ESS in Norway.
The kit required custom mounts as well as plumbing to fit under the 8 series. This was very involved and included re-routing the AC hoses as well. ESS custom programed our car for optimum performance by addressing all the parameters provided.
Cost $6000
