the EDAL anti-lag is a great free mod. you can find more info about it on the solstice forums.

basically it bypasses the built in solenoid that controls boost but my ecu already re-learned. but for the first 10-15min it made a huge difference. IT took the cobalt from being utterly smooth to put you in the back of the seat. I can't wait to get a tune because that was just a taste.

The basic idea of this mod is that normally the ECU holds back the turbo until a certain amount of pressure has been relieved via the Charge Air Bypass Valve (Solenoid) (which relieves vacuum pressure from the turbine after the throttle is released). This mod is designed to stop that behavior, resulting in more rapid turbo response (less turbo lag).

From a practical perspective it's about getting the turbo to respond at a lower throttle setting. Put another way, the turbo may kick in half way down the pedal travel instead of 3/4th of the way down, depending on circumstances. So now you can use the turbo in situations where it might not have kicked in before.

I was talking with Lyndon Wester today and he mentioned a trick I might try to get a little more HP, it's a waste gate adjustment. I did it this morning. the rod under the turbo has adjuster nuts, run the front one all the way to the stop then tighten up the back one, "shortening" the rod. I am seeing higher boost levels and it builds faster. I saw a nice improvement, try it if you like and no I don't know if it will void your warranty, no I don't know why it didn't come this way. If you have any reservations just don't do it. If you want to try it go for it, if not leave it alone. This is the rod you adjust, just run it down to the stop, it is under the turbo, just remove the heat shield and you will see it. I make no claims about anything but I like what it did.

I have learned a few things, first off every car takes the (wastegate) adjustment a little differently. They are not all the same stock. This is supposedly set by Borg-Warner before it is shipped to GM. They are all supposed to be the same, hence no adjustment procedure. From playing with mine that has a larger Dejon intercooler. I learned the intercooler makes a difference on it getting learned out, the MAP senses air pressure and temp, the intercooler by design reduces the temp, therefore the ECM learns out less. I kept a lot more of the increased boost than friends with the stock intercooler did. I was able to run the Westers Race tune with the adjustment 3 threads from Max and no knock. On the lastest test tunes from Westers I had to put it back to stock, or as close as I could get, I think this may be a thread or 2 more than stock was. I run it set with the adjuster in the middle, equal thread count from front and back. This works very well with my current tune, my car jumps hard when I get in it. I am pretty sure if I got back on the dyno I would be very close to 300 rwhp now, and somewhere in the 330 range on torque at the wheels. My recommendation is slowly move it forward until you notice a faster spool time, then leave it. The faster spool time is the biggest advantage that does not get learned out, and does not require much adjustment at all. This is a very touchy adjustment on a tuned car and can make big differences in performance, it is worth the effort to fine tune it especially if you have a larger intercooler.

It would be much safer if you adjusted very gradually, (one or two threads at a time) and monitored either all or some of the following: knock retard, spark retard, spark advance, inlet air temp, exhaust gas temp, CAT temp, air fuel ratios, boost level, etc.

Monitor these readings at different RPM levels, especially at 5K to redline. The key thing to watch for is an indication of the engine starting to go into knock, a sharp raise in EGT or CAT temp increases over the normal temps when the wastegate rod was in the stock location and/or a boost level exceeding 23 pounds. These are very good indications of going too far with your rod adjustment.