Twin Turbo Skylark 350 Progress by sean Buick 76

3 minute(s) of a 265 minute read

I do not really have a goal for the HP, I have a goal for 10.50 in the quarter with this all steel street car. 

I project it will make about 600 HP without too much boost.... I think it is capable of hitting 750 HP at about 18 PSI however not sure I want to push it that hard. The turbos are sized so the car will make lots of boost quickly as this is a street car not a race only car. For torque, that is the key! Even at a paltry 600-650 HP the torque should be massive from about 3200 RPM on up. I expect the car to have great mid range torque alowing me to run my goals and keep the RPM under 6000. 

I know a guy with a 355 inch chevy running high tens at 12 PSI of boost using the same turbos. He is using heads that flow about the same so it gives me a good idea how it will react. He leaves the line at 2000 RPM with no trans brake and his datalogging tells him he gets from 0 PSI at the line to 12 PSI in 1.2 seconds. 

I will be leaving the line off the trans brake so I should be able to make about 6 PSI at the line. 

I am buying another set of the same rear 15X10 wheels so I can mount 27X11-15 drag radials, on the street I will run these 11" wide 31" tall BFG tires. With the 3.42 gear the RPM on the highway with the tall tires is exactly the same as the original tires and highway gear were. At the track the shorter tire will help my gearing... This was my way to get the gearing I want at the track and the RPM on the highway where I wanted it without overdrive. The 2004R is a great trans but massive torque kills them.... I stuck with the tried and true Th400 with all the goodies and a nice tight converter (2800 stall but good quality so low amount of slip) 

I will not post the engine pics till it is all pretty, but it should look a bit like this: