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Hey, I am mostly on HybridZ.org since I have a 280Z and I am in the middle of an RB25DET swap. I will explain a couple facts for you:
1. PPl say stick with the stock motor because I have seen more power made out of an L than an RB20DET. Nothing against them, I think they are cool and they have plenty of capability. However, there is a lot of hidden costs in an RB swap unless you buy one already running and swapped into an S30. The L is a stout beast; the grandfather of the RB, so to speak. Don't underestimate it. With moderate modifications and above, my money is on the L.
2. There is a LOT of work needed on that chassis. You say you know what you're doing, fine. Go for it. No worries. Obviously the chassis will need repaired before handling a big chunk of RB power.
3. The reason most ppl go RB25 instead of RB20 is because the marginal cost difference is actually pretty small. As I said, lots of hidden costs. Unless you are keeping it very close to stock, there is no point in NOT spending an additional ~$500 for 25% more displacement.
4. Get ready to fork out $500+ for an oil pan. $200 for a rebuild kit. New pumps. Etc. Etc. Research it extensively. You can get a Megasquirt, manifold, turbo, fuel system, etc. for the cost to switch to an RB platform and you will have less displacement. You can get a spare L motor for $100 or so. How about that RB? Everything is more expensive; many by an order of magnitude. I know, since I have done both.
Anyways, nothing against Zilvia, but you are on the wrong forum for the best and most experienced member base for S30's. Just be sure you read and search and read and search before posting. Even a post like this would most likely get flamed a bit. Most anything you want to know is already covered on HybridZ.org.
Take Care,
Mark
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