The car ran great under WOT but the idle quality left something to be desired. The stock SRT-4 fuel setup runs a constant fuel pressure so when I went to the 750cc injectors it caused the idle to run very rich. I couldn?t fix the idle with the e-manage alone. To cure this I purchased a return style fuel system along with a rising rate fuel pressure regulator from Nemo at www.rage-tek.com
The great thing about this new fuel layout is that I can turn down the fuel pressure at idle to achieve a stock-like 14.7:1 A/F while at the same time adding fuel with each psi. It also gives me some head room with the 750cc injectors because I can raise the base fuel pressure to get more out of them.
Since I had nothing better to do, I decided to drive down to Nemo?s shop and have him install it along with a ported intake manifold. After the install we put it on the dyno. At 28psi falling to 24psi the car made 449whp and 457ft-lbs on 116 octane.
On the way home I had some fun rolling into the boost. The load was too much in fourth gear however, and the stock clutch would begin to slip. Time for a new clutch...
Once I made it home I began to think about why the turbo would not hold boost. A friend suggested bringing it over so that we could check for boost leaks. We added a shim to the wastegate just to be sure then pressurized the intake and sure enough, leaks everywhere. With each leak fixed I noticed it picking up about 1psi. Pretty soon we had them all tightened up and it was holding 28psi to redline.
With the leaks fixed I decided that I wanted to try and see just how much abuse the stock clutch could take, so I headed back to the track. Surprisingly, the clutch held for several runs before crapping out...
