This is one of the most thoroughly prepped cam-only cars I've seen to date. It's a 6 speed manual 2006 Corvette with a stock LS2 short block. After adding American Racing Header 1 7/8" with no cats, Magnaflow catback and tune, the car put down 390rwhp. Strong, but certainly within the realm of what healthy LS2s make.
Next, the following items were added:
FAST 102 LSX-R intake (stock, unported)
102mm electronic throttle (yes, the big one)
MAF delete with 4" straight tube (no inlet restriction at all)
Calloway Honker CAI
ASP underdrive pulley
Custom 234/242 .602/.605" 112LSA +4 advance cam ground with EPS lobes
Yella Terra Ultra Lite 1.7 ratio rockers
Patriot Extreme dual valve springs with Ti retainers
Manton 11/32" pushrods 7.475" length (shorter pushrods were too noisy)
21 degrees of timing at peak torque, 23 degrees of timing at peak power, 12.5-12.8:1 A/F ratio.
Final results were: 502.945 rwhp/451.791 rwtq.
The way the EPS lobes carried power was a thing of beauty.
The flattened torque curve is very common when running a cam with a lot of overlap coupled with the American Racing 1 7/8" headers. Typically, the curves you see are higher at 3500 rpm and lower at 4000 rpm, but with tuning, it flattens the curve out. The steep climb of torque to 4800 rpm is a testiment to the well chosen valve events. It comes on the cam very hard!
The MAF delete was mainly because so few MAF options exist in the 102mm range. The stock 85mm MAF is way too small for a 102mm TB and large necked cold air intake. The stock MAF would have been a choke in the system. There's also no denying how well the large 102mm TB works with the new FAST 102 intake. We only get a 1 KPa drop in MAP vacuum at 6800 rpm. The intake restriction is virtually non-existent.
Last edited by pewter99; 07-21-2010 at 01:39 PM.
Reason: Added underhood photo
The general consensus is the 1 3/4" Headers are better for the smaller Engine. You have proven otherwise. Congrats. The 7.475" Push Rods
with the Yella Terra Rockers suggests you could have TFS Heads. if you have stock Heads then there is much left on the table such as Ported 102
and Heads cut for Compression. i see possibilities of 550RWHP here with
the magic in the Cam selection. Congrats, Leon
With the same setup, what do you think an LS3 would do?
The camshaft is too big for an LS3. The piston to valve clearance would be too tight. With a cam in the 230/238 .600/.604 114 LSA +2 size along with the rest of the bolt-ons like this, 500rwhp with an LS3 should be a breeze. You just can't cut corners though.
The Endurance cam lobes, stiff pushrods, and good rocker geometry are critical keys in making this kind of power. Sane goes for the extremely free flowing intake tract. It is rare that you only get a 1 KPA vacuum drop at 6800 rpm. Big TB, big air bridge, MAF delete, and large CAI opening all contribute to the power up stairs.
What makes the EPS lobes different then the other lobes? Do these lobes make more peak power only or does it also help in the low and mid range? Does this lobe work with an A6 bolt-on LS3? I know I'm asking a lot of questions..but..I just ordered a cam from Vengeance that has XFI lobes and want to try to understand the differences. The cam I ordered is a 231XFI/234XFI on a 115+3. It's smaller than the 234/242 on a 112 but I'm running an A6 with a 3600 torque converter and wanted a very streetable ride. Any info on the EPS lobes vs the XFI lobes would be appreciated. Thanks
What makes the EPS lobes different then the other lobes? Do these lobes make more peak power only or does it also help in the low and mid range? Does this lobe work with an A6 bolt-on LS3? I know I'm asking a lot of questions..but..I just ordered a cam from Vengeance that has XFI lobes and want to try to understand the differences. The cam I ordered is a 231XFI/234XFI on a 115+3. It's smaller than the 234/242 on a 112 but I'm running an A6 with a 3600 torque converter and wanted a very streetable ride. Any info on the EPS lobes vs the XFI lobes would be appreciated. Thanks
You can search EPS lobes over on Tech and you'll find great results. EPS (Engine Power Systems)
Corvette Store
Cam-only LS2 C6 Vette makes 503rwhp
) 0-60 mph 2.625 sec (track)
