Hello there,
Welcome to my project blog! My name is Vlad, I'm a Mechanical Engineer from Toronto, Canada. Please follow me on this quest to convert a Porsche Boxster S roller into a V8 beast!

Boxster V8 conversion

Cooling system continued

I don’t have a hoist, so it was pretty difficult to snap good picture of the fuel system. Here is a basic diagram of how I did it. I decided not to run heater lines, since it will probably be hot enough in the car from the engine compartment. I do not plan to winter drive it.

This is a pretty simplified diagram. You will also need a tee on the vent line, to hook up the engine vapour lines. It was impossible to find a 0.5″x0.5″x0.25″ tee, so I just put one together from plumbing parts. BTW, if you are looking for hose fittings or connections, head over to JTR (Jaguars that run) website.

The line sizes are:

  • Two big coolant lines running to radiators are about 1.5″
  • The filler line is 0.75″
  • The vent line is 0.5″
  • Renegade fittings are 1.25″
  • Thermostat housing is 1.25″

I suggest you get a reducing silicone sleeve on the main Porsche coolant lines (1.5″ to 1.25″), and then run the rest of the system in 1.25″. Make sure to stock up on unions and hose clamps. I think I used something like 30 clamps. Some 90 degree silicone or aluminum elbows will definitely come in handy.

V8 Boxster cooling system parts

Coolant and intake parts

So Renegade made this beautiful aluminum intake, yet they couldn’t make enough clearance for the timing cover bolts… The heads are already filed down in the picture belwo.

Fuel Lines

The fuel system is pretty straightforward, just buy some reinforced fuel line and compression fittings. If you have an LS1 or LS6 fuel rail, you will also need a fuel pressure regulator/filter. The GM regulator mounts perfectly in the old location of the Porsche fuel filter. I cut the fuel lines just before the filter and used -6 AN compression fittings to transition to a flexible reinforced line.

V8 Boxster Fuel Lines

GM fuel filter/regulator on the left, and Porsche fuel filter on the right

BTW, if you decide to run truck ignition coils (which are better than LS1 ones), the fuel rail connection will not clear. You have to cut the tab that holds it to the rest of the fuel rail and bend it off to the side. I don’t have an up close picture, but it should be visible in the one below.

More work on the BMW

While inspecting the BMW for a bushing upgrade, we notice the common cracks in the body around the subframe studs. The extent of the damage was pretty serious; I think we counted over 20 cracks in total.  It took us a full week to change all the bushings, weld the cracks, and upgrade his headers. The 2005 320 now has a 330 engine, M3 rear subframe and diff, poly bushings, M3 rear brakes, 330 front brakes, headers, and soon to  come euro tune.

E46 Cracked Subframe

E46 Cracked Subframe

E46 subframe reinforcement plates

Welded in E46 rear subframe reinforcement plates

E46 poly bushings



First start

Hey guys,

once again, I apologise for the lack of updates recently, I’ve just been really busy trying to get this thing finished. On Friday I started the motor for the first time with no major issues. The starter and fuel relays had to be jumped, which is something that I still need to figure out. I have to spend the next few days cleaning up the wiring, making hard brake lines, and mounting the hand brake. There will be much more detailed updates in the next week or so. I apologise for the bad video, but I honestly wasn’t expecting it to start the first time. I shut the engine off quickly because I thought I heard some noise and then my phone died.

First start up #porscheV8 #boxsterV8 #rollingshell #boxster #garagebuiltcars #porsche

A video posted by Boxster LS (@porschelsx) on