I'm wondering if there is a better cam to match my intake, heads & supercharger. Currently running Comp Cam 276HR-14 (220/230 @.050 .540/.540 with 1.6's) with Miniram (30# injectors & 58mm TB), Pro Topline 220cc heads and Paxton sc (about 5-6lbs boost). The prior owner put this cam while still running stock intake/head setup with intentions of eventually going w/ a SuperRam and then added these heads & intake but left the cam. I don't think it's well matched. The cams range is 1800-5800 while the intake can pull up to 7500. Not looking to spin that high but wondering what might be a better match now that the engine has the more freeflowing heads/intake along with the higher rpm range. I was contemplating the Hot Cam or wondering if I could maybe retard the cam to bump up the RPM range? I'd like to see 400RWHP and some high 11 sec ETs. Prior owner said current set up ran 12.60's at 109 all day long.

 

Call Cam Motion 225-926-6110


//end thread.

 

That's almost helpful...did do some additional research though & think I've answered my own questions.

 

Wont need too much cam/heads for 400whp with boost. Your heads are already big for the motor and want to rev up 6500+ but as long as the blower is big enough to feed that motor that high in the rpm range, you should be fine and well above your goals. Custom grind would be best but something about 10 deg larger than what you have now will pull in the 6500+ rpm range.

I just think its unnecessary for your power goals and ET goals.

 

From what I've been reading on here & the LT1 boards, there are a lot of guys running low 12's, even a couple w/ high 11's with comparable setups minus the blower (ZZ4's w/ MR or HSR, cc305 cam and smaller heads like AFR 195s). I'm thinking the biggest short fall of mine is lack of a good custom tune. The SC is probably only pushing around 5lbs of boost (from what I've been told/learned from the SC boards b/c of how free-flowing the engine is & the intercooler) but hoping Paxton comes out w/ the VR series for the SN series so I can increase the boost.
I know the heads are big, wouldn't have been my first choice, but were on the car when I got it. They're actually at the machine shop now so will confirm their size. They have 220 stamped on them, however, the valves are 2.02's and from research, I've only found info on 220 Pro-Lightnings having 2.05's but they're also about 10 years old so who knows how accurate that info is.
So, I think for now I'll retain the cc305 as I know the car ran relatively well and was very streetable. My plans are for more of an auto-x/pro-touring type car vs. drag anyway but wouldn't mind the 11-sec bragging rights either.

 

Yeah 5-6 psi should get you 11's. That setup as is should be a mid 12 second motor naturally aspirated so few psi should easily get high 11's.

 

That's what I figured...previous owner only ran 12.6 @ 109 w/ supercharger but like I said, it's just an "over the counter" TPIS chip. I think a proper tune would make a huge difference.

 

With boost it definately could use a tune. I dont like tuning setups with out having a good 2 or 3 bar MAP based sensor and a timing table that is boost referenced, but you can make it work. Like a MAF car, you can use the MAF to handle as much flow as possible from the blower before it maxes out and then use FMU to increase injector pressure to get enough fuel. Also use PE tables in the chip for fuel and set timing table already few degrees pulled out, but this is a bandaid to the proper way to tune a boosted setup.

That setup will respond well to a good tune, as that motor should run near those times n/a. Over the counter chips are often hit or miss and mostly miss..its just difficult to get a mail order setup to work well unless you have exactly the same combination. I have tried my 383 tune on several 383's and even a 406 that were "similar" but not the same and the tune never worked well on either of them but did run "ok" on the 406...just wasnt optimal.

 

I appreciate the info. I may be consulting you with additional questions when the time comes. BTW, love how your intercooler looks through the front...right now mine is set up horizontally facing the ground) with a makeshift vent underneath, I plan to reposition it and open up the grill area like you did. Looks mean and far more functional.

 

Not to be "cocky" here but it's the best info you'll ever receive. Let's be honest here, not a single person on this website is a cam expert. Getting recommendations from anything less is just a waste of time.

Also, with your current combo your car should run well into the 10's...

 

I'm revisiting an old thread of mine here but when I pulled the cam out I realized it's a 112lsa (224/230 & .503/.510 + 1.6rr's). I called Comp Cams and the guy said the 112lsa isn't that bad but he'd like to see a little more split in the duration and recommended one of their Nitrous series cams, either the NX276HR (224/236 &.502/.510 w/ 113lsa) or the NX288HR (236/248 & .520/.540 w/ 113lsa). I originally had hopes of upgrading to a VR4 but the kits are on indefinite hold. Comp Cams said the NX288HR would be nice for the increased boost when I am able to upgrade. Curious what you guys think, the 276 is basically what I have now, would the 288 be overkill with the smaller SN2000 supercharger I have now? BTW, my current heads are on ebay, planning on going with a set of 195cc, 65cc heads...I think they'll better suit my discplacement and the higher compression (approx 9.6.1 will work better with the smaller supercharger.

 

What heads you getting? if you have a good exhaust port, you may not need much more duration. Abit more would be nice but 6 deg split on a 112 shouldnt hurt too bad. I'd probably run what you have with 1.6 rockers. Should be .536" lift then. Thats more than enough cam for that setup.

288 is abit big IMO.

 

Probably as cast Pro-Filer or AFR's, depends on how much I get for the Pro Toplines. I like the price of the as cast Pro-Filer's you turned me onto in one of my other threads.

 

Also found this in the classifieds...514/.524 228/236 .050 113 lsa...8 degrees of split, a pinch more but a little more lift & 113lsa vs. the current 112lsa. For the asking price, thing the add'l split & 113lsa might be worth it?

 

I think it would be if the price is right. Hard to say for sure, both cams are gonna be fairly close in power since they appear to be close on specs. Dont know what the rest of the lobe looks like but I dont expect too drastic of a difference