Stefan wrote:Chris,
Nice to see the car coming along. You and Tom will have two of the best Lemans across the "pond".
With the big turbo your fitting what are you doing intake wise? I couldn't carry on with the stock TB location on mine - I junked the stock GEt fuel rail too. Now using the 2L 16v TB (off a UK Ecotec - 57mm butterfly) and a XE/LET aluminium fuel rail.
Yes... I have been thinking about it.... I was considering the idea of using the Naturally aspirated 8V MPFI intake and modifying it to accept a significantly larger throttle body.
I also have other ideas but I think this one is the "quickest" route to getting car going.
I'd really like to manufacture a new intake system using Quad drive by wire throttlebodies.
I would also keep the mount for the original throttle body exactly where it is and use the stock throttle position sensor to feed data to the drive by wire throttlebodies.
Basicly..... the quad throttle bodies would be set up in a feedback loop such that each one exactly mirrors the position of the original throttlebody.
It would be a fairly simple piece of electronics.... it's just a matter of making a simple voltage conversion or a map may be required if the TPS signals are non linear.
The only thing I don't know is whether the stock throttle body will feel the same with no air running through it .... I'm hoping that most of the feel comes from the return springs and not the force of the air on the butterfly.
One other posibility is to design a barrel style throttle body like they use in formula cars.... but I don't know if I will get into that kind of hardcore fabricating quite yet.... the stock throttle cable location is perfect for a barrel type since it's well off to the side of the intake (unlike some of the other designs where the throttlebody is centered on the top of the intake)
I am definitly going to use one of the uprated Astra VXR fuel rails (and injectors) on my C20GET.
I'm also contemplating the idea of a dual fuel system..... regular 91 octane from the fuel tank feeding one set of injectors and race gas, tolulene or ethanol feeding a second set of injectors.
This way I can bring up the octane levels on demand as boost rises..... then I can make serious power on the track when I want to and still get reasonably decent economy on the 91 Octane when cruizing around town.