Join Date: Sep 2005
Location: Grand Ledge, MI
Okay, I contacted my friend that has a contact at DCX, and I requested information for the following parts:
1. Exhaust manifolds, left and right
2. Rocker arms and components
3. Intake manifold
My ideas were that I could take the prints for the intake manifold and develop an adapter to install a supercharger from a GM 3.8L that are all over Ebay. But, that would be for later for a couple of reasons, primarily is because of packaging. It seems to me the only way one of these blowers will fit is if the owner has a custom hood, and since that majority of owner's don't have that, it will take lower priority. Plus, from what I understand, the manifold is tuned to make the most of what can be fit under the hood, so I'm not going to mess with that for anyless less than forced induction.
There isn't much that could be done with the rocker arm assembly except to make it lighter, that is, decrease the inertia of the rocker so that the engine will rev easier and maybe reduce internal friction by a fraction of a horsepower. It may be possible to change the rocker arm ratio some, but I'd be leary of changing it much without having the necessary changes made to the engine controller as well. But I think that for the return on performance for the work and money involved, not real practical to pursue this right now.
Which brings me to the exhaust manifolds. After seeing the factory pieces, the way they dump into a common runner and how they do a 180 degree bend, I think there is a huge potential for improvement here. I think that if I can fit a set of headers in there with equal length runners, plus a few other little tricks to optimize power output (both low-end torque and upper rpm horsepower) I think it'll be the best bang for the buck. Between the weight savings and the increased airflow, it will be a noticeable improvement. Plus, it should also be relatively easy to fabricate and test. I would try to make it so the owners can reuse the factory cat converters to save money, but it's still too early to tell.
Plus I don't even have the information that I need yet, so this is just all floating around in my head for now, nothing concrete has happened yet.
I'm investigating whether the MSD coils for the GM LS1/2 can be used on our cars. It offers a slight chance of better fuel efficiency and maybe a slight power increase, but probably not much. It would be a benefit if someone were to have a need for a more powerful spark if they were running a turbo or supercharger.
I'm also looking at the intake and exhaust valves. My thought there is that the valve stems/heads might be able to be re-shaped to increase flow, decrease mass, etc. Anything to help get an extra little bit of power, reduce valvetrain inertia and friction, etc.
I got a throttle body that I'm going to look at to see if there's any practical means of modifying it for any significant gains in power thru improving airflow in and out of it.
Anyway, I just wanted to mention what I'm up to and see if anyone else had any ideas for something that they'd like to see. If I can get my hands on the information I'll be more than happy to look into something.