I've actually made an excel spreadsheet for calculating compound twin turbo sizing while accounting for intercooling and aftercooling. Most of the parameters are able to be changed.I sized things out for my own car and bought another turbo but am not quite yet ready to get that on there. It looks like with the stock turbo and a 60 trim T3 I should be efficient all the way down to around 20 or so and up to about 105 psi. Here is the second turbo I will be usingI don't think I will intercool it and just run a single aftercooler due to space and plumbing restrictions. So much boost can be generated that I see no reason to look for every single advantage there is to be had.
I just bought a digital camera and I'm not too familar with posting pics etc.. However here is a link containing some pics of my project www.msnusers.com/gtdforum/shoebox.msnwI had to pull my head off due to a headgasket failure at 37 psi,I'm sure that my 12.9 grade capscrews were not tight enough though.I then found the cylinder damage that can be seen in the pics also.
It usually exits on the driver side.It was a little tricky to fit a 2.5" downpipe on the passenger side between the motor mount and the bottom turbo with that elbow/adaptor though.I was tempted to cut a hole in my hood and run it up through.I'm pretty sure the 2.5" is big enough and I'll do a restriction test to see if it cuts It.
PCP>injector pop pressure=very bad!
...what is the pop pressure for the IDI injector?
We lowered the compression down further from 21.1:1(3 notch HG) to 18.5:1 by installing GM 6.2L pre cups in my 1.9 head. ...We took about a 1/16" from the OD and height on the 6.2 cups as they were thick and tall.We also took about 1/16" from the chambers in the head.Then done some rurther porting to match things up.