Cam advice please.
I'm looking to purchase a cam kit. I've already decided to order from Tick. They did great work on my t56 years ago along with the great customer service that came with it. I also respect the gobs of knowledge Martin willingly spreads, and amount of advice he gives for free to all of us on Tech.
I have an 01 Formula 6spd, lid, 1.75" LT's, 3" xpipe with dual 3" single chamber flowmasters. Stock gearing for now (will be 3.90-4.10 once I upgrade to a 9"). Minor weight loss. Gets driven maybe 1000mi a year. Monster st 2 clutch. Tick MC.
Ok, I sort of have it narrowed down to 4 of his cams. First question is, am I open to using any cams from the LS2 category or do I need to stick to the LS1 choices only?
From my research I like the LS1 TM3 (235/243) the LS1 SH2 (231/235) and if I am open to the LS2 cams, LS2 TM2 (231/235) and LS2 SH2 (233/240). Or I guess basically all of the "almost" big but not small cams.
My only cam history is a Hot Cam in my old LT1 and I regretted going too small after about 1 week. My Firebird is our 3rd car, rarely gets driven. Kind of a weekend warrior, if even that much. But when I do have it out it's usually to accomplish a mission. I'm fine with big and obnoxious but every once in a while the old lady may have to drive it if her car were to be in the shop or something. I would say the only thing holding me back from a big polluter size cam is being scared of having a tuning nightmare, and I would love midrange torque, not looking for a cam that only screams between 5000-7000. I mean I did find a dyno graph layover of a before and after bolt on car and I was impressed how the torque went higher than stock as low as 3500rpm on the Polluter, On the other hand our local track closed down a few years ago so I doubt it will ever see actual track time. So I guess I'm trying to find out if one of the cams I mentioned above is right for me? Or what would be the different characteristics of them and maybe I could make a decision then. Cam/intake might come in the future but is nothing I see in the cards in the next year. Rear end will be next I have a feeling.
I would appreciate any help you all could give me.
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I have already found a local tuner with a dyno and he recommended by a few different LS guys. I will for sure be getting a few baseline pulls so I can post before/after rusults. I'll be doing the obvious pump and chain but the only other power changing part would be IF I decide to get an UDP and install it at the same time.
I would not invest in your 10 bolt. I also have 18x10 wheels with 285/30-18" hard tires and have a problem with wheel hop.
I wish I could talk to you guys about the SH Stage 1 V2 but I don't want to bugger up formulaon18s thread.
Now I'm trying to decide if I should get an UDP to install during the cam install since it's apart anyway
Actually had a guy gain 76rwhp last week! Best thing about this cam is the IC event isn't so late that you're losing a lot of trapped mixture at low engine speeds. It is a late enough IC event though to make big gains past 4500-5000rpm in high speed torque production.
The Martin camshaft with a quality tune should have you in the 115/116 range. Some CNC heads is where the 120+ begins
I ran it thru the cam calculator and see IVO 4.5, IVC 44.5, EVO 52, EVC 0, 4.5 overlap and 7.91 DCR. Intake lift is .615 and exhaust lift is .575
I've read that the LS6 intake gets peak flow at around 6200 rpm which equates to IVC of 42 so 44.5 would allow a bit more cylinder filling. EVC of 0 helps cut reversion. IVO of 4.5 presents more curtain area at the point that the piston starts sucking on the port and the LSL lobes fast ramp and .615 lift expands that curtain area. In the "Help me Understand Valve Events" thread, many suggested EVO of 47 would squeeze more torque out of the cycle as the expense of high RPM contamination so the SH 1 V2 LS2's EVO of 52 would help it carry RPM better. All of this helps me understand why 99Bluz28 and A.R. Shale Targa like it.
What I don't get is the exhaust valve lift of .575 ? Could someone explain to me why the 3719 Xtreme is a better choice than the XFI or LXL lobe in this application.





