240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

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Old 10-30-2012, 06:22 AM
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Hey, recently my 95 240sx with s15 sr20det/6speed was stolen from my front yard when i was sleeping. But thats not why im here today. I just bought a one owner 74 260z with ~70k original miles that will be at my doorstep in just over a week. It is going to be my daily driver and my baby . I wont have much of a budget to begin with but my goal is to have ~155whp and extremely good drivability/reliability. The only mod it has as of right now are 2 2barrel webers, which is a good thing because what i read about the stock carbs are terrible. My question is, what mods should i get to achieve my ~155whp and daily drivability. And also are these carbs good for what im looking for. Thanks for any help
Sorry no pics as of right now, but as soon as it shows up, ill post a couple.
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Old 10-30-2012, 06:47 AM
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Oh and one more thing i want to add.
I plan to do a couple autocross events here and there, so if my bushings arent shot would i still need to get a new bushing set because of the performance difference, or is there not much difference. Also does the 5speed's ratio from the 280zx make the car feel/perform faster/better?
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Old 11-15-2012, 09:11 PM
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Hi And welcome to the Z world. To start, personally, I would ditch the webers and go back to a set of early round-top SU carbs with SM needles. Side draughts are much better suited to the demands of an inline engine as opposed to down draughts. Some people swear by the webers but in my experience, they tend to be more problematic, decrease fuel mileage and( judging by the cars I have driven) actually decrease performance especially below 3500 rpm where most of your street driving is done. You can pick up a set of used SU carbs (be sure to get the early model 4 screw round tops) for a very reasonable price. The maintenance on these carbs is also very simple. Set-em and forget-em for the most part. To get the numbers you want, I would start with a good set of headers (I prefer 6-2-1) from MSA, I free flowing exhaust (2.25") and a Good performace air filter. Once the Z is breathing better then I would move to the ignition system. Many people are replacing the old points systems with later model electronic distributors. As for me I have a Pertronix flamethrower coil, Accel 8mm spiral core wires and NGK plugs and that works for me. You could also look into a pertronix ignitor kit instead of replacing the entire distributor. I would estimate this should get you to about 140 WHP, Any further and you will have to start changing internal parts of looking into engine swaps. As for the bushings, if the factory bushings aren't toast I would just leave them be. If you are going to be on a tight budget, there is no use in spending $300 on a master bushing kit for a very minimal increase in performance. I would put that money towards a quality set of springs and a good set of struts.
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Old 12-01-2012, 07:58 AM
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Ok cool, ya Ive read that the su carbs are good even up to the 180hp range, but are my webers really not cut for it? How much difference did you notice when you put the flamethrower on? I already have 7mm wires but i read people go up to 10, is that too much for what im looking for? Ya the bushings are still in tact and all there, but when i hit hard bumps my car kinda drives to the left for a second so what would that be, tie rods? i was looking at eibach springs and illuminati shocks, so i hope that will still give me comfort at performance
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Old 12-01-2012, 10:54 AM
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tie rod ends, ball joints and bushings and shocks. Do the whole package half measures won't cut it.
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Old 12-01-2012, 05:18 PM
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Tokico blues, for the shocks I love em
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Old 12-08-2012, 07:16 AM
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Don't believe everything you read. I have the original carburetors on my 260Z with no problems.

If you don't have much of a budget, plan on using most/all of it on maintenance. It's a 40 year old car. Inspect all of the rubber lines: radiator hoses, heater hoses, fuel lines, vacuum lines, brake lines. You are likely to need to replace some or all of those. Inspect the electrical system carefully. Make sure the brakes are in top shape. Inspect the master cylinder & brake booster. Change out all of the fluids, including transmission and differential.

If you have a budget left after that, then look at increasing performance.
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Old 12-27-2012, 04:02 PM
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Well changed gears and going for the turbo, Collected most of the parts, Ecu, turbo, harness, fuel pump, intake, exhaust, injectors, oil pump, afm

Need to install return oil line in the oil pan, throttle plate, miscellaneous fittings. Stay tuned.
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Old 01-03-2013, 05:41 PM
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Here are some pics of parts collected.







Attached Thumbnails Get Started-20121220_135213.jpg   Get Started-20121230_150348.jpg   Get Started-20121230_145953.jpg   Get Started-20121230_145936.jpg  
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Old 02-26-2013, 04:56 AM
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Here is the before,, ready for install. Cylinder head at shop for fly cut and valve job!


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