LS1 Cookbook

[jimb0]

Interesting article in January's HotRod magazine in conjunction with Comp Cams. I can't track the full text down on the internet, but the gist is:

Stage 1: Baseline
375.1 lb-ft@4500rpm
366.1 hp@5700rpm
- Stock GM LS1 crate motor with GM PCM
- Original LS1 intake manifold
- Stock '99 Camaro exhaust system with stock exhaust manifolds, dual cats, and Y-pipe (no mufflers)
- Stock '99 Camaro 75mm throttle body
- Stock '99 Camaro 75mm MAF
- Stock '99 Camaro airbox
- Aeromotive adjustable fuel pressure regulator

Stage 2: Induction Tract
385.3 lb-ft@4700rpm
398.0 hp@5900rpm
- FAST LSX intake manifold for 78mm throttle body
- FAST LSX 78mm throttle body, cable-driven with TPS
- FAST 85mm Granateli MAF

Stage 3: Camshaft and Exhaust
434.9 lb-ft@5200rpm
468.7 hp@6100rpm
- Dynatech headers, merge collectors, and exhaust ('98-'99 F-body)
- Comp Cams Xtreme RPM XR289HR hydraulic-roller camshaft
- Comp Cams 5/16inch-od x 7.400inch-overall-length Hi-Tech pushrods
- Comp Cams beehive valve springs
- Comp Cams titanium valve spring retainers
- Comp Cams high-perf hydraulic-roller tappets
- Comp Cams 1.85:1 Pro-Magnum roller-rocker arms
- Comp Cams 5/16inch flat guideplates for 5/16 pushrods
- Comp Cams 3/8inch rocker studs
- Comp Cams 3/8inch adjusting nuts
- Comp Cams set screws
- Raise fuel pressure 5psi from 42psi to 47psi

Stage 4: Ported LS6 Heads, bigger cam
438.3 lb-ft@5900rpm
516.1 hp@6600rpm
- Wegner Automotive Research NC-ported stage 2 LS1 heads
- GM 2.00inch hollow-stem LS6 intake valves
- GM 1.55inch sodium-filled LS6 exhaust valves
- Comp Cams Xtreme XE-R XER281HR hydraulic-roller cam
- Comp Cams Pro Magnum 1.75:1 roller-rocker arms
- Catalytic converter test pipes
- K&N air-filter assembly
- Shim valve springs 0.050inch to raise seat pressure
- Raise fuel pressure another 5psi from 47psi to 52psi

Stage 5: 90mm Throttle-body
448.7 lb-ft@5700rpm
531.6 hp@6700rpm
- FAST 90mm throttle-body
- FAST 90mm upper intake top shell
- Adapter hose, MAF-to-90mm throttle body

[Boosted Ls1]

I'm usually sceptical about some of the claims in that magazine. Iirc they got somewhere near 500hp from what was almost a crate ls6 with a few tweaks and I didn't believe that. In fact their base line ls6 engine made a load more power then GM claimed, which is why I'm so sceptical. Also, look at the power hikes, 32 hp from an intake swop plus maf etc. Those guys at GM must be real thickies not to have spotted that! Interesting read though, some of the mods would be useful.

Boosted.