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Hi If anyone on here has previous experience or has undertaken such a project I would be grateful for their advice and help in the following. I am building a street able and possibly a light competition car. Something to have fun with. What I imagine is a high revving, very responsive engine with uprated brakes and suspension and a stiffened chassis. I am looking for around 180 to 200 wheel horsepower. The type of car that is not stupidly quick, but something that you can rev out and enjoy pushing through the bends and enjoy through the whole rev range. Not an all out track car with all the power at the top end. I have built a few projects my self and am looking to build the engine myself. At the moment I have my 280z with the stock L28 engine with stock EFI system. I have got it running but don't like the way the engine performs. It seems to have a bit of torque but is sluggish/lazy. It is not a free revving, spirited engine. This could be because it has lost its performance as its old and has an out dated EFI system but from what I have read the L28 is a long stroke engine so not high revving and responsive. This has led me to consider, from what I can see are the 3 options. I want to keep the car naturally aspirated. 1. Rebuild my L28 and increase compressing as from research its a low compression motor. Also add triple Webbers and some cylinder head work (CAM etc.) I am not to hopeful as from what I can tell the L28 is a long stroke engine so even after this work it wont be high revving and will not be very responsive. Also the stock 5 speed gearbox does not seem great for this application. 2. Source an RB25DE as I want to keep the car naturally aspirated. From my research these engines rev higher and make about 150 wheel horsepower. So with this engine I may get away with a simple refresh and possibly some cylinder head work, cams etc to squeeze a bit more power out of it. I will need new mounts, prop shaft, wiring loom etc. 3. Source an RB26 and turn it into a naturally aspirated engine just like Sung Kang's build. This seems to be the more expensive option rather than the RB25. I have done some research and it seems in order to raise the compression of the RB26 I would need to install high compression pistons and stronger rods, change the CAMS, New springs and possibly port and polish the head. I would want to produce an engine that has performance through the rev range though and not all at the top end. I will also need a wiring harness kit, new sump to fit the S30 chassis, ECU and prop shaft made. I calculated this all to cost, including the purchase of the engine and gearbox (RB25 gearbox) to be about £7k if I build it my self. So if anyone has any experience in this it would be great to hear their opinion and what they have done. Many thanks Paul
