PI “top end” nets you the compression bump. That is all. It doesn’t make the engine equivelant to a 99-04 GT engine because those engines use the same 9.4:1 compression ratio as a stock npi engine. PI engines use deeper dished pistons, while the heads have lower CC combustion chambers, npi pistons use shallower dished pistons with larger CC combustion chambers. PI heads have a more efficient combustion chamber, which is why they don’t tolerate(need) as much timing advance, but this has more to do with emissions in application than performance.So what's the whole point of a PI top end? I have been under the impression these last 5-ish years (of the 7 I've been a member) that a PI top end essentially nets you a Mustang GT (1999 - 2004) engine. And we know that those put out 260HP. Or have I been entirely mistaken all this time?
Or are you talking WHP numbers while everyone else is talking BHP numbers? Because we all know that manufacturers don't put out WHP numbers.
Ford has published horsepower numbers for PI 4.6s as low as 225 and as high as 260 depending on model, take them with a huge grain of salt. Most real world before/after npi-PI dyno numbers start at between 180-190 RWHP and end up at about 210-220RWHP. PI engines vs npi engines with PI cam/intakes are nearly indistinguishable on the graphs.
60 horsepower won’t happen unless someone dynod their car using before RWHP numbers and used the most favorable factory crank numbers for their claims. I vividly recall an issue of Muscle Mustangs and Fast Ford’s where they did this mental gymnastic.
Well I’ve managed to not break mine yet, and I went a hard year without any wheel hopping preventative measures in my previously worn out IRS with collapsed hardware!I guess time will tell. Everyone here knows I'm beefing up my suspension. While eliminating / reducing wheel hop hasn't been my intended goal of my suspension upgrades, it will definitely be a result of it. Worst case scenario will be that I have a set of half-shafts ready to go should I need them.
I consider those three TCCoAers first, FBers second, each got their education from here. I’m suggesting if you’re bouncing off ideas between the forum and FB, favor the forum advice 4:1So throw away info from people like Rod (Racecougar) as well? I mean, there are a few people there who everyone looks up to, such as Rod, Ralph, and Woodman, to name a few but still. There's a few people there that I will listen to. Others though, yea, I'll agree with you.