I found this @ garretts home page. I think I can get some of the different trims through my employer, but I need model numbers and applications. I know not all trucks use t4s. There are small ass turbos on 3.2 liter isuzu diesels and some other little diesels. I just need more info on the subject. I asked the parts dept. to try to get me some a/r ratios, but i don't know what else to look for. can anyone help?
-Garrett GT 15 compact turbocharger is designed for today's small displacement engines. Based on the well-known T2 design, the GT 15 family is engineered to provide an economic performance boost for small displacement diesel and gasoline engines in passenger cars, light duty trucks and marine applications.
The GT 15's application range is for 1.3 to 1.6 liter (60-80 bhp) diesel engines and 1.0 to 1.4 liter (85-120 bhp) gasoline engines. The compact packaging makes the GT family ideally suited for twin turbo applications on V-block engines. The GT 25, at the high end of the range, can be configured to match gasoline engine ratings up to 210 hp. The GT 17, GT 20, and GT 22 fill in the flow ranges between the GT 15 and GT 25.
The Garrett VNT 15 (GT 17V) turbocharger is currently featured on the VW 1.91 TDI engine in the new Beetle, among others.