Mythbuster: continuing project thread of my 1303 '75

[Wally]

Originally Posted by Humble

I love my borla xr1 it really toned down the exhaust quite a bit. How much rpm are you spinning by the time you hit 1 bar boost now? I know it added a bit more lag but is it tolerable?

Surprisingly, it is very drivable still even lag is a lot more, but I still have about 5 leaks to fix with welding header connections...
1 bar was at ~ 3600 rpm in 4th, now its ~4400. Hope fixing the header boostleaks will help a bit to bring that down some.

[Wally]

Fixed some header leaks, so I now get 1 bar at 4250 rpm

Also got all springs back in the Tial so it opens at 1 bar when not controlled. Also retuned the maps a bit and went for a test drive again. Man, what a rush! At 1,2 bar I got actually a little scared and didn't proceed with the other higher boost settings I had planned today...

Picture from the new exhaust openings

[Bad bug]

Good job wally, i guess we can say that twin scroll turbos work, but just a little question here how did you group the exhaust pipes is it 1 and 3 4 and 2.