Hello , I’m new here I converted my Sierra to turbo and thought that I would have to make public to exchange experiences if necessary. To the car : 85er Sierra 2.0 iS iS stands for sports version with the following characteristics: 3 doors , body as with the Cossie chassis of the XR4 lank wheel of the Cossie falcher black rear spoiler paint 2 colored at my top silver bottom black mileage: ca 450tkm to the engine: 2.0 OHC 85 kW = 115 hp L-Jetronic mileage: ca . 150tkm from ebay 60 euro (first engine I have blown off at 420 tkm) to the turbo: Garrett T3 from Saab 9000 Turbo ; I think, because without internal wastegate and only oil cooling mileage: unknown from ebay 40 euro Status Quo: Turbo is in there with self-welded cracker Charging air cooler at the moment leaks ( from the Mini Cooper S) compaction not yet withdrawn ( I think 9,5:1 ) Lamda probe with indicator for mixture check charging pressure indicator, charge air temperature sensor , turbo oil temperature sensor The thrust starts different early depending on the gear ( Turbohole) 1. gear only at 4000 2. gear at 3000-3500 3. gear at approx 3000 4. gear at 2500 5. gear at approx 2300 Up to a charging pressure of approx. 0.5 bar you can drive well 0.6 usually goes but also leans off the mixture. Since I did not have a Wastegate that means carefully giving gas (I had already about 1.0 bar, ups ) Acceleration has improved little about 8 sec da turbohole in the first gear ( and since ic h only give half to 3/4 gas) I estimate power to min 160 hp up to about 180 or even 200 consumption of course also rose from 10 to 15 liters I drove so now 250 km times see how far I’m still coming 🙂