by hammerdown7 » Thu Nov 03, 2016 6:59 pm
There are a couple of turbo Cosworths out there today, both are running EFI, one stock EFI and one custom EFI. The stock EFI car, actually the whole car, is stock except for the turbo, and is a drag car, having run a best of 12.96 in the quarter with the stock 4-speed. The other is a street car running a Corvette 6-speed. Both run stock cylinder blocks that are sleeved. That can be precarious because some stock blocks have a tendency to split along the bottom of the water jacket when the horsepower gets higher than 275, most likely from varying casting densities. The drag car has run up to 20 pounds of boost, although it hasn't been dyno'd at that level, without block problems. The street car has run as much as 26 pounds and has been chassis dyno'd in the 340HP range and has been driven for over 6000 exciting miles without problems. Both of these cars run stock compression of 8.5:1. The drag car is in Ohio and the street car is in California.
A safe boost level is in the 10 pound area, where the engine was putting out 215HP. This engine was put together and dyno'd by an outside source working for Chevrolet in the middle 70's when Chevy was thinking about the possibility of offering an over-the-counter kit for the CV, unfortunately it was never offered.
I know there have been other CV's that started down the turbo path but I have only seen the two cars I mentioned above.
Dick