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I'm fixing to put an 82 280zx motor in my 75 280z. It has 100,000 miles on it. I'm replacing the rings ,all gaskets and seals including injectors seals, and timing chain and sprockets. I was planning on using my intake w/K&N ram air and motorsport headers w/2.5 exhaust and turbo muffler (no cat). Anything I'm missing. Any muffler suggestions. Summit has a 2.5 turbo muffler for only $15 that dyno 21 horspower gain over the leading competitors muffler. I have a 2 dynomax super turbo right now. Any advice. Any other worthwhile parts to change over. Thanks Sam 75 280z.

P.S. I am already using the 3.9 rear end from it.
 

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Discussion Starter #2
> I'm fixing to put an 82 280zx motor in my 75
> 280z. It has 100,000 miles on it. I'm
> replacing the rings ,all gaskets and seals
> including injectors seals, and timing chain
> and sprockets. I was planning on using my
> intake w/K&N ram air and motorsport headers
> w/2.5 exhaust and turbo muffler (no cat).
> Anything I'm missing. Any muffler
> suggestions. Summit has a 2.5 turbo muffler
> for only $15 that dyno 21 horspower gain
> over the leading competitors muffler. I have
> a 2 dynomax super turbo right now. Any
> advice. Any other worthwhile parts to change
> over. Thanks Sam 75 280z.

> P.S. I am already using the 3.9 rear end
> from it.

Hey Sam,

How's the 3.90 rear end feel? I take it you have the early 5 speed. Is it a huge improvement? What revs are you running in 5th @ 60mph? It's a conversion I'm thinking about. Thanks. Simon
 

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> Hey Sam,

> How's the 3.90 rear end feel? I take it you
> have the early 5 speed. Is it a huge
> improvement? What revs are you running in
> 5th @ 60mph? It's a conversion I'm thinking
> about. Thanks. Simon

I've got the 3.90 with the late model 5-spd and turn about 2,400 at 60 mph. It has the .745:1 OD vs. the .864:1 OD in the older versions. That should put the engine rpm about 2,800 at 60 on the older 5-spd and 3.90 rear end. That is assuming stock diameter tires (195/70-14, 205/60-15, 215/50-16 or 225/40-17). Any direction up or down in sizes from these will affect the engine speed and speedometer accuracy.
Phantom
 
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