Because the boost controller wil also allow 1.4 at 1100 rpm and that's way too much for that RPM. This will cause the massive knock if your ECU won't intervene by retarding spark and cutting fuel if that won't help. Low RPM, high spark advance combined with much higher boost than optimal for that RPM will cause knock.
Of course it isn't comparable, but that doesn't mean your solution is superior, only cheaper. You can get a remap for under UKP 100 by buying one of the "one size fits all" chips, or by burning one yourself from free downloadable examples. If you want to spend a bit more you can buy a squadra tuning chip for E340. A rolling road tuning of your car will cost more, your UKP 500 estimate would most likely be quite accurate. This won't be much use unless you do significant modifications like bolting on a bigger intercooler, change your turbo for another model, change your camshafts etc. etc. If you do such modifications, you would gain from a rolling road tailor-made setup, if you want more grunt from the standard kit, a (squadra)chip is in my opinion superior to bolting on a static boost valve and hardly more expensive.You are talking about remapping the car to gain different characteristics at what cost? ?500? I'm talking about a boost controller that will liven up your drive to work for ?25, that isn't comparing like for like.
Just changing the very conservative mapping from the factory to a proven working faster one, like Squadra or other chips, will get you much more fun out of your stock setup. I'm sure that someone would be willing to make some chips of the publicly available modified images for beer-money and shipping costs, so that shouldn't be prohibitive. Jim Nielsen is already poking around in the maps to change several parameters so we have at least one member that is making his own chips.It's true that a full remap is the way to go to take advantage of any engine mods, but how many of the guys in this thread are going to go to those lengths?
Several people in this thread are already looking at changing cams, swapping turbos etc. so they would benefit from a rolling-road session for tailor made stuff.
Bookmarks