Engine upgrade - part #9 - final results

So far the engine have behaved extremely well and almost no problems at all. A bad battery connector, small coolant leak because of a loose jubilee clip, oil filler cap leak, but nothing serious.

Then it was time for a rolling road session at Turbocenter. It was kind of the ultimate test to see if the build was successful or if the engine would dissolve in a puff of smoke. The first time Claus took it to rev limiter my hands were shaking and my heart was up my mouth, but it held together!

As you can see in the video, in the beginning there was some problems with tyre slip against the rollers. I left the car with them for a week while going for a well needed vacation and I'm not sure how he solved the tire slip, but I think he tied down the roll cage to the floor. 

The final result is: 231 hp on the rear wheels @7500 rpm. Max torque ~230Nm. It would for sure be interesting to know how much that power would equal on the flywheel, but that is impossible to find out. Google it and you'll find lots of opinions on this subject. The loss is dependant on gearing, tyre wear, tyre air pressure, moon phase etc etc and even compare the same car on the same dyno two different days could generate different results. But I guess crank power around 270-280 hp is within reason.

As seen on the chart I have a problem maintaining constant fuel pressure when power increases. The reason for this could be many, leaking low quality fuel regulator, insufficient fuel pump, clogged fuel filter, too narrow fuel lines. Before buying a new pump Claus recommended me to move the fuel regulator to the end of the fuel rail, and put the fuel return line from there. He had a neat solution for this and I might give that a go further on.

I also have a power plateau around 4500 rpm. I don't know why. Could it be the exhaust system? I leave it as it is for a while and let all this digest until I feel ready to handle it.

Immediately when I got the car I took it on a test drive. It is early April and the roads are cold and my tyres have almost no rubber at all, but on all of the first four gears I got wheel spin when getting into the engine's power band!! This is crazy!

UPDATE: A test run this morning. Here is a 110-190 km/h comparison before and after:

Special thanks to:

Hanns Per Kober
Jeremy at Cosworth
Steve at SBD Motorsport
Claus at Turbocenter
Jan at ENEM

Also thanks to:
Kenneth at Motortjänst
Nacka Biltrim
Helpful members at Focaljet


All parts:
Engine upgrade part #1 - intro
Engine upgrade part #2 - disassemble
Engine upgrade part #3 - parts
Engine upgrade part #4 - block assembly
Engine upgrade part #5 - head
Engine upgrade part #6 - putting it together
Engine upgrade part #7 - electrical and fuel
Engine upgrade part #8 - first start
Engine upgrade part #9 - final results