Before going boosted with a turbo kit of any kind, I was thinking about doing some work on the internals to beef them up. I thought that would be a good idea. Has anyone done any such thing?

What is the engine code of the 300ZX TT? Is it VQ30DETT? Is that the same as our 4th gen VQ30DE motor, but with beefier internals? My next question is obvious... would it be possible to get the internals off that engine for use in a gen 4 Maxima?

Lastly, are there any manufacturers out there who make forged internals for a VQ30DE engine?

Sorry for the many questions and hope someone can help answer a few. Thanks.

 

The 300zx has an entirely different engine than a maxima, it is a VG, we have a VQ. There is a VQ30det engine from overseas that you can get internals from, use the search feature, it has been discussed many times.

 

The 300ZX motor is a VG30DETT, like the VG in the 3rd gen. I know Pauter has made VQ rods, and I imagine others have had custom rods/pistons made elsewhere. Do some searching on the subject.
-hype

 

If you are going to beef up the internals any, (personally I think they should hold seeing other peoples results) research into loweing the compression, that will allow you to support and get more boost and it would put the same strain on the engine as if it had lower boost but higher (stock) compression. Usually if I'm correct you'll see a 9:1 or 8.5:1 compression.

 

I agree with you, but I just started to develop a tiny bit of blue smoke mixed with white smoke out of my exhaust, at sporadic intervals... whether I am on the gas or not...

The engine is running very strong and I am getting good track numbers, so I don't know if that smoke is just a result of not having a cat... or if it is oil related.

So I just wanted to start researching now... in case further down the road I need a rebuild. I am also considering a turbo setup in the future, so I don't know what kind of strain that might put on the engine.

Another thing about building a motor to run boost... wouldn't that mean that it would be less powerful than the stock motor in NA setup?

 

I would say slightly yes. Lowering the compression on an NA and comparing to an NA w/ 10:1, you'll be slower by a little, however the upside is that if you SC or Turbo, you'll be able to run more boost safely than the 10:1 engine w/out messing up your engine.
My friend w/ his Z has a similar blue/white smoke when the engine is at idle sometimes. When the car is warming up, it's normal because the condensation is burning off in the exhaust, after the car is warmed up, that's got to be some other issue like burning oil. My friends car runs VERY strong as well.
Good luck w/ your research.

 

I don't know exactly what you mean by this statement. Building a motor for boost is almost the same route as building the motor for N/A. Everything you buy ( pistons, rods, valves etc ) will be brought for either route but just with diff specs. Having higher compression pistons for a boosted car ( such as 10:1 ) isn't exactly worse than having 8.5:1 pistons. The higher it is just means you need to know how to tune that much better because you have less room for error. If you plan to get some aftermarket pistons and know of GOOD tuners that KNOW what they're doing, you'll get more power out of having the 10:1 than the 8.5:1.

Just thought i'd share what i've learned to help ya out.

 

But, that is if both engines have the same amount of boost/NA going to them. If you were to have the 8.5:1 ratio and just simply turn up the boost on the wastegate, you have much more room to increase boost then you would with the 10:1 and you can push the engine slightly farther....

 

But the original question was:
Disregarding boost the 10:1 would be more powerful than the 8.5:1 due to the greater compression. I've driven a car with low compression pistons (before the turbo got put on), and you could definitely feel the loss in power.
-hype

 

Possible culprit of the smoke...





Oil could be getting past your valve seals similar to what happened to mine.

 

Right but what we're trying to say is if you have a an engine at 10:1 pushing say 10 psi, making X amount of HP, If you took that same engine, w/ 9:1 or 8.5:1 compression (which will yeild a little bit less power), run say 15 psi, you'll have more HP and still put the same amount of strain on the engine that's 10:1 running 10 psi. ANd you're right, you do have less room for error w/ 10:1
EX. (sorry if these are all Z examples, I've been out of the Max community for a while)
In bandcamp... I mean TT.net, they actually turboed an NA Z which made something like 340-360 RWHP at a lower psi than the Turboed Z at the same psi. Although w/ the 10:1 compression it made great numbers, you just can't push the engine much more trying to squeeze out 400 rwhp on a higher compression than you can w/ a lower compression engine on higher boost.