2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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PSI isnt something you have to watch out for as much as rwhp. In a general sense each PSI is about 10-15 hp. Either way most people say if you really "drive" your car and not like a grandma :P then stay at around 450 rwhp with a stock block. I have about 420 and hoping to get 450-460 soon. Not worried. Wont have to until the 500 rwhp marker then start replacing the rods, pistons, and the other infamous engine components that are weak stock. Again if you dont really drive your car hard you could get away with higher... but it isn't recommended.
2014 Shelby GT500 Deep Impact Blue w/ White Stripes
821A performance package, recaros, and navigation
Cylinder pressure and the associated pressures on the rods and crank are created by a slew of things. The most important thing to remember is pre-ignition knock pressures can be 100 times stronger more violent than normal combustion pressure. 5 seconds of knock is enough to trash a motor compared to hundreds of hours making 450rwhp.
You must have one helluva good job for a college kid (if I got that right) to be looking at superchargers already. Might I recommend the Brenspeed 302 rotating assy. if you're really looking to get up in the numbers?
I have an 06 as well. Some believe from a lot of high HP and dyno sessions that the 05's and 06's had more robust internals and did not break nearly as often as the 07's, 08's and 09's. This was varified by many shops on this forum a few years back.
Since you have an 06' as I do, I finally settled on 10 psi since I don't drag race, and it's controllable power coming into and out of turns, and launching when feathering 1st gear properly. On basically stock exhaust I've been at 376rhhp@4 psi, 415rwhp@8psi, email@example.com, 475rwhp@12 psi, and now 454rwhp@10psi, all tunes basically at 16 ignition timing on my Saleen series VI.
No problems so far. Knock, knock!.......on wood......... Erik
I have an 06 and I'm pushing 10.5 psi on my with out issues but then again I don't drive my car like a moron either. If you take care of you car it will take care of you and let you run big power without much trouble. I ended up putting down 498RWHP on my auto trans at that psi and that was before we even tried to lean out the AF level. So I was hitting those numbers with an AF of 10.5 which is crazy. In the end we ended up taking out 3 degrees of timing to make it a little safer which took me down to 475RWHP range. But it was really nice knowing that my car could hit over 500RWHP with just leaning out the AF. But I will wait till I have the funds to buy a stroked 302 short block and then punch it up into the 600+ range
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