i've searched and searched but don't see anything about it, so my question is has anyone lower the boost to 5, 6, or 6.5 lbs of boost on the aps st, or turbonetics kit for reliability purposes? i would think that that be a lot safer and still make 320 - 350 whp correct?

 

You would have to swap in a lower PSI spring or actuator onto either kit so that the base boost pressure is 5 PSI. Then use a boost controller to raise it to the pressure setting you want..

 

yes, i am aware of that i'm just wondering would it be more safe then the stock turbo kits, and yes i would get it tuned to 5 or 6 psi. and would it still have good gains over stock NA.

 

Well anytime you are making lower HP you are putting less additional stress on the motor. It doesn't really matter if its 50 or 150 extra WHP when you add that much power it creates additional strain on parts that weren't designed with that kind of power in mind. While 5-6 PSI and less HP will create less additional stress I doubt in the long run it will make a huge difference in longevity.

 

well basically its looks to me from these forums thats not to common to snap a rod with the turbonetics kit if left at 8 psi and maintaned properly, but still happens once in a while, so I was thinking that the turbonetics kit is right on the egde with the vq's limits so if i basically detuned it to only 5 or 6 psi, i should be very safe and still make the car somewhat faster. If i could get 320whp and tq I would be more then happy. and this setup in my mind will have more poetentical then the superchargers down the road if i built the block and be safer since it only 5 or 6 psi compared to the 7 , 8 , 9 psi that the supercharges use. but please correct me if i'm wrong because thats why i'm running my possible plans by u guys

 

Thats true... lowering the boost pressure and power output should reduce the chance of engine failure.. But as everyone knows theres no such thing as a sure thing when it comes to boosting a motor like the VQ. Your plan is sound though..

 

thats exactly what I did.. now were using the utec to control the boost. no more boost creep.

 

problem is, with the reflash if you put it at 5-6psi, you're going to run horribly rich under boost. Massively, black-smoke kinda rich.

Also, at 5-6psi, the turbo is probably going to be surging as it's not in the efficiency band yet.

 

well how did it work out / perform for u vantage 350z?

 

Or you could get "lucky" like me and only make 355-360 to the wheels at 8psi...