Want advice, please.

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iamdub

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For the towing aspect, I don't see how boosting it would have any downsides. It tows your trailer just as it is, at it's current power level. Boosting it would only increase power. Sure, it won't be a whole lot of extra power, especially at lower RPM. But, mo powa is mo powa. The real problem is your motor being an LQ9. This limits the amount of boost you can put on it. People throw 10+ PSI on LQ9s all the time, but they're in purpose-built lightweight street/race cars and their tunes have to be on-point. Mashing the throttle on your heavy SUV while pulling a trailer adds a whole world of dangerous variables when you're already on the ragged edge. You stand on the pedal, the trans downshifts and the RPMs climb, so the SC starts making it's boost. But, instead of the truck being light enough to move in conjunction with the RPM from this additional power, it responds much more slowly because it's pulling a big trailer. This is the equivalent to severely lugging an engine. With a boosted high-compression engine, you'll probably get detonation first. Best case is that the PCM retards the timing and saves the motor. But you lose power, countering the point of the SC.

You could run lower boost, but then it's not worth the hassle. You're better off going with a cam and maybe even higher compression for the extra low-end snappiness. At least tuning for this would more reliable due to the more consistent variables. Or, go with the SC and have separate tunes for towing and not towing. This would be a whole hell of a lot of work to get it safe yet effective, though. You'd basically have to have someone (someone very experienced) live tune it while you drive around with your trailer.

In short, it's just too risky. Sell the P1 to someone with a more appropriate use and put the funds toward a roots blower or NA mods. Or, if you're rarely ever gonna tow, do what you want with it. For those rare occasions when you do tow, drive like a grandma and don't ever give it lots of throttle and keep the RPMs "low". Ease up to highway speeds and know that you'll never be able to floor it to pass.
 

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