busted33

iTrader: (5)

Hello all -

I hope this is the right place for this type of question as I am starting to finalize my plans for my 2000 Jeep TJ Wrangler LS swap.

This is my first LS build as I am a former BBF guy and recently switched to the LS for the cost vs HP (cant be beat) and the BBF is a stretch to shoe horn into the wrangler. Anyways I have picked up most of the parts (rotating assembly, heads, engine, etc..) for this build but I am looking for advice on the how you would run the cam and/or piston choice I have made. I have a really good building/machinist in the Detroit area I am working with who did my BBF projects in the past and he now works for GM racing. Before I take everything to him I anted to get some input here. Well here goes:

I am putting together a 408CI with Callies Compstar crank and rods and Wiseco -8 dished pistons. I am running a 243 head that was CNC ported by MTI. According to my calculations this should out me very near 11:1 compression. The CAM I have is a COMP grind with the following specs:

3017R XFI intake with 286 rated, 236 @ 0.05 and .362 lift
3730R XE-R exhaust 289 rated, 240 @ 0.05 and .358 lift
HR115

I am running this through a 4L80E and AMG232 transfer case going into a 2000 TJ Wrangler. I have 1 ton axles and running H1 dual bead lock wheels and 37x12.5x16.5 mud tires so torque is the goal here. I am also hoping to keep tis some what streetable for weekend cruizin and driving back and forth to the trails/dunes/pits.

Does this sound like a solid build plan or would you change anything? I am looking for a lot of torque and I am hoping to run this on 91 octane and on the street occasionally.

Any feedback is greatly appreciated.

busted33

iTrader: (5)

Forgot to mention at this time I have a brand new NNBS intake with the gold TB and stock injectors. I am guessing this may be an issue but since I am looking for a torque monster maybe this is good enough?

99Bluz28

iTrader: (35)

That should work pretty good, but for a low rpm TQ monster among 408's I'd probably go smaller in the range of 224/228 110lsa and up to a 230/234 110lsa depending on the rpm range you'd spend most of your time in.

You'll also probably want a higher stall TC, depending on what the stall rpm is now.

Rise of the Phoenix

iTrader: (27)

A LSx in a Wrangler will be a huge upgrade to what's in them already. I remember my Jeep Wrangler; SOB couldn't even pull itself up a steep hill.

redtan

iTrader: (5)

I agree that you should probably look into a slightly smaller cam for low-low end torque. Not that that cam would be bad perse, but I imagine most of the time the engine will live under 4k rpm (maybe even less) and you can certainly maximize gains there with a different cam and possibly more compression.

busted33

iTrader: (5)

Thank you for the feedback on the lower cam but I am not sure if I can go more compression with a smaller cam and keep my SCR below 8.5 so I can live with 91 octane. Am I right in my theory?

redtan

iTrader: (5)

Just playing around with a compression calculator, a 230/234 installed on a 111 centerline will still give you something like 8.4 DCR. You can go smaller than that but retard the ICL a bit to 112 or 113 and you can get in the high 220s duration and still be below your desired DCR.

But I'm no cam guy, so you should really consult someone more knowledgeable about valve events and where you really need the power.

If you have steep gears in the rear end to make up for the 4L80E gearing then I guess you don't need that small of a cam to build torque.