TR230 CAM and a Vortech Supercharger
I was told to keep the duration under 220..
I went from an X1 to a custom cam that me and jim over at speed inc. came up with....
214/218 .540/.550 114lsa...
Idles like stock....only give away of a cam is when I have the cutout open and I get some blower surge and the car starts idling at like 500, sounds like a big block monster w/a loud whine... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
What type of blower do you have?
How much HP are you producing?
What's your best ET?
When I put this S Trim blower on my car what am I getting myself into? My original plans were to go with CAM mentioned above, which I have already, LS6 Stage II ported heads, LS6 ported intake, 42.5 lb injectors, inline fuel pump, 100 shot w/ TNT Twister Force II kit, just in case I'm losing, only spraying 3-6000. I don't want ANY '03 SVT to have a chance this spring.
I just put a '00 SS together with a TR224/227, ported heads, and a V-9 Vortech... the car idles at 900 rpm at pulls from the crack of the throttle to 6500 !!! The camshaft has the most incredible street manners... it drives as well as stock around town. This car has 2 stages of NOS also, one stage of 35 in the throttle body on WOT and a window switch. The second stage on the intercooler with a 50 set on a manual switch and a WOT switch... the NOS is to change the incoming air temp only. Anyway, I wouldn't go much more agressive than this cam with a blower. The comment make by Nickn20 is correct in my opinion also... The car runs great ,so plan on buying a killer clutch set up when you are finished with the install.
Later,
Joe
<small>[ March 13, 2003, 07:11 AM: Message edited by: PBJ ]</small>
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N/A I put down 370rwhp and 455rwtq and ran an 11.6@117.5 w/a full weight car...I've dropped 60-70 pounds since then...
Now w/4psi I put down 453rwhp and 540rwtq....I'm not upping the boost until I do a new motor, which should be soon, I honestly don't know how long my current bottom end will last...having issues for some reason, and its only got 15,500 miles on it...you can read my problem in the internal engine section...
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You want 114-116 LSA depending on where you will shift the car and whether you want to focus on the midrange or topend.
You want to keep the exhaust valves open longer for better scavenging.
My new FMS/Cam Motion blower cam has more exhaust duration and is designed for top end.
<small>[ March 13, 2003, 01:17 PM: Message edited by: Pro Stock John ]</small>
Had other issues...
But, spray is a lot more violent than boost...
I wouldn't want to watch a dyno of a 150wet shot...motor wants to torque off its mounts... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
If I were running a 9:1 motor with 15#'s of boost on stock displacement I would run about a 234/242 114LSA XE-R cam with some advance ground in (depending on where you want it to peak <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> It would idle at 975 no problem and give great power under boost <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Cheers,
Chris
Lift: Go with whatever complements your cylinder heads. My stage II 6.0 heads work great up to 600 so I have 590/600 lift. But lift is not as important as the duration.
Duration: More duration on the exhaust side, the SC is pumping in hard, you need to get expel the exhaust as fast as you can. I'm doing more research on this, I might run even more exhaust duration but I'll know for sure by the end of the day, right now I have been planning to run 6 more degrees of exhaust duration. A 218/224//114 will run good with a stock bottom end car, you can shift it at 6500 and make good power. A cam like Chris suggested will probably need to be spun to 7000 rpms according to Terry at Cam Motions. I have been plannig to run less exhaust duration than what Chris is suggesting and my planned shift points are 7200/7200.
LSA: I'd stay at least at 114, or go higher. The higher you make it the stronger the top end will be, some of the stuff out there is running 118-119 LSA for turbo race cars. But most of us will want to stay in the 114-116 range. I went with 115 over 114 to get rid of some of the midrange and help the car up top. Some racecar stuff is in the 113 range but no lower for supercharged cars.
<small>[ March 13, 2003, 01:26 PM: Message edited by: Pro Stock John ]</small>
What's more important on a supercharger cam selection, duration or lift? I understand the need to avoid allot of overlap (you'll blow your boost out of the exhaust before it's burned), but are there any rules on lift? Are large duration cams going to have a harder time idling due to the increased load?
That is why I suggested the 234/242 114LSA XE-R cam. I would also do ported LS6 or 6L heads.
Remember grinding in advance can drop the peak a few hundred rpm as well <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
That engine setup with 28x10W slicks, TH400 with brake and 4.11 gear would be the ideal drag setup IMO <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
With a blown 346, TH400 and brake you are going to want to maximize power from 4000rpm to 7400rpm. That is going to be your operating rpm range for the entire 1/4 <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Cheers,
Chris
I am going with a 6 degree split, Chris, I have seen cams with up to 8 degrees of split, but not 10, does anyone make a 10 degree split cam?
FWIW I talked to Cam Motion and Comp (the actual guy who designed the XE-R series) and CM suggested a 6 degree split and Comp suggested a 4 degree split.
I think your idea would peak earlier than mine we are trying to get my combo to peak at 6600rpms or higher but to still pull up to 7400.
I think when picking a cam it's important to decide how high you will buzz the motor and then pick specs accordingly.






