After all the time taken up this year with other (more important) priorities I finally found some time to wrench on the Charger.
Quick update of what I changed. I upgraded my valvetrain to the FWD Crane springs and MP Titanium retainers with MP keepers. I also tapped the other end of my fuel rail and added a second 500hp fuel pump and am now feeding the rail from both end......enough flow for 900WHP.After seeing Reeves max out his 72lb inj's I figured I better upgrade to 95lbers as well and I can now datalog to 45psi.
So, after retuning on the stock cam I dropped in the F4. For those of you who don't know me, I have always been as concerned with the street drivability of my car as the raw performance. One of the reasons I have taken the stock cam and exhaust mani as far as I have is for this reason. Also, it has been a matter of debate for years in our community, wether or not a high lift/high duration cam will work better than a stocker in a high boost application, and let's face it, who runs more boost than me!
My good friend Warren has been wanting me to drop this cam in for years because he believed it would net me the same kind of gains he saw.....3-4mph increase. Now that would be what, at least 30-40whp gain. After seeing the result of my 480whp dyno I was set on the cam being my next change. (because my peak hp rpm never went up even though my peak wtq did go up significantly)
To the matter at hand......one of my biggest concerns, how bad was this thing going to idle? Was I going to have some iritating lope? I'm still using o2 correction, so I can't richen the idle to much to compensate. I fired it up and to my shock and surprize.....it idles smoother than it has in 4 years! My idle on the stock cam had gotten a little worse as the 95lb inj's were at .8 at idle and fluctuating to 1.2 inj P/W so I would get a slight up and down idle (not to bad though) the F4 cam moves so much more air at idle that the inj's are at 1.2-1.4 and there is no lope at all! This was the first indication that the cam may be here to stay.
Next, I went out and (with my boost turned down a few lbs just to be safe) I checked my AFR's, cam deff needed way more fuel above 5000rpm. Was funny driving the car, I was worried about how much bottom end I was going to loose, but the Charger still felt zippy enough to bomb around (N/A) just felt real tame below 5000rpm. I had just had the car out on the stock cam and from 4000 up the car is insane......no Q. But the power of the F4 was so linier that it was an easy ride, then at 5200rpm or so it's like you hit a N20 switch.......and your gone! I checked my datta logger and my full spool with dump open (stock cam) was 3900rpm. I dropped the F4 in right where my stocker was, if my turbo didn't suffer in spool time I figured I'd leave it there. Datalogger showed full spool at 4000ish rpm.....close enough.
Now there was 1 more run at the local track and it was this past wknd, I tested the F4 cam on Friday, richened the AFR's and figured I was GTG. You can read the details of what happened at the track in my other thread, but suffice to say the car picked up 2-3mph, I have surpassed the limits of my 4 puck clutch and it did it on 3 lbs LESS boost than I was running last year!
Warren was right, properly set up, these cams loose nothing at higher boost and only GAIN you power! (big thanks to you buddy, for nudging me in this direction!) The F4 works in the Charger like it was made for my build, I feel like I've lost nothing and only gained....I want to thank Cindy and FWD for making a kick @$$ cam and I hope this settles the debate on wether cams work in our 8v cars!Oh ya, as soon as I get a new clutch that will handle the power I will still do the stock to F4 cam dyno comparo I was planning on doing.....stay tuned!
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Originally Posted by glhs727
12.57@104 :O) 
That's cool, I always told people that the bigger cams work better the more boost you throw at them, nice to have some real world evidence. 
