So what was to be the final mapping session, was a bit of a mixed bag If I'm honest.
Since installing the first SC kit, however long ago that was, the car has always had an unstable idle and prone to stalling just wheen you don't want it to.
Installing the all the new inlet and dump valve piping took 5 minutes and then Bob started cheking through the engine etc. After about an hour he was still struggling to get the car to a steady idle. After some testing and double checking it became clear that the map sensor wasn't working
. The map sesnsor was installed, new, with the Raptor kit. Based on my experience with the car I'm not sure it ever worked. Fortunately Bob has a collection of bits and we were able to swap it out for a woking item, so after 2 hours we had some progress.
So after another hour of me just standing in the garage wathcing Bob, he was still struggling to get the car running how he wanted it. So off came the new inlet for a closer inspection and testing of the new Forge recirc valve. Although it was fitted with a red spring it was opening under the slightest breeze
. Again Bob to the rescue with some spacers to help increase the pressure on the dump valve and finally we got it to hold 0.8 bar at tickover.
The next problem then showed itself, even though everything was exactly where Bob wanted it he was still struggling to get the engine steady. For whatever reason the setup we had with the SC just wasn't working. So i removed the new inlet system and dump valve and installed the old system, which gave a much steadier tickover with the new map.
So in total I spent 4 hours standing in Bobs garage feeling we had got no where. But in reality we have made some important break throughs which now just require a little bit more fabrication. Hallie, fire up the welder.
What we learnt is that when you supercharge a Subaru in the way I have, DO NOT USE A RECIRC VALVE. There is something strange happening in the inlet tract that keeps oscillating air when you least need it.
So for now the the car is exactly the same as when it left this morning, although with a very slight change to the original map.
This is my second visit to Bob and in fairness to him, he has not charged me for any of his time or the parts added to my car. My car is a one off so there are bound to be unknown issues to overcome. Roll on mapping session number 3 after which I can sit back and relax........... However I did notice that Rotrex now make a SC capable of delivering 900bhp which just happens to bolt straight into the bracket I have which would work well with the engine I have in the machine shop. Maybe next year....
The next session is booked for Friday 13th July..........