260ZRED

I have two round top SU's, and my car seems to be running good. I tuned mine by the 'ear' method. (just keep turning stuff till your engine is running smooth) Is there alot of power to be gained when using the Unysen thing? Ok and one more thing: after making sure both carbs are pulling the same vaccum, how do you get the best fuel mixture? Colortune? Luck? I'm pretty new to this, but what i did was basicly turn every knob on both cars till my car ran well and sounded strong. Is there alot of power to be gained doing it the "right" way? And what would that right way be?

Is it just me or are the pics not there anymore? I wanna see them! Stupid comps.....

Thanks guys! I like Zpeed's "cheepo" idea the best, going to try it and post some results... I was wondering what those holes were for anyway! One more thing - would it help to have the stock orange airbox chromed or polished? Polished metal is supposed to reflect the heat away??? Off topic: Will I have to adjust my carbs after I do this? And can anybody hook me up with a K&N filter for the stock orange airbox?

Can somebody please explain what exactly 'air horns' do? I got a 260Z with 2 72 SU's and was wondering if it is worth buying the aftermarket airhorns.... Anybody got the ones from motorsport? Do they help at all? How are they supposed to flow more air and has anybody tried making their own? Thanks for any info. Also, how can I test the efficiency of my intake system?

i have the exact same question! The other day I touched the orange air cleaner assembly and it must have been at least 100 degrees! anybody done something interesting with this?

thanks a whole bunch guys! Perfect time to learn how to weld!

...and now one end of my header pipes is crushed to about half its original width... another pipe got crushed only a little (like a fifth). This is all on those little individual runers, right before they all merge into one big pipe....I have 6->1 headers but I got no idea what company or what design.... What would be the most practical way of straightening my header pipes out? Would drilling a tiny hole and using something to pull the metal back to its original shape work? Any body got a different method? I really dont want to take them off because it is crushed only in one place and everything else is fine....my car sounds a little feeble now and less deep thanks for any tips on this....

This is a question for all the 70-74 dual SU people.... what intake/air cleaner are you using? What are you most happy with? Would a stock one (Orange) with a K&N filter be sufficent for a mostly stock motor with headers and free flowing exhaust? If any body got an unique air intake setup or know some good methods of giving their Z cold air, post some pics, info, and any cool ideas please thx guys!

forgot to say.... the ignition system is an electronic one of of a 280 with 'NGK?' wires and those wierd split sparkplugs....it was installed recently.

I did my valves with my dad and now my top speed is about 65 MPH... a 15 mph improvement! The engine feels so much better now! Who ever's reading this... Don't forget to do your valves!!! Anyway, as soon as it gets to 65, the engine just starts going put put put very quitely and then the putputput just speeds up, but no power is made, and if the gas pedal is pressed, the engine does die.... Is it running to rich or to lean? I asked different people and got totally different answers. The wierd thing is my car ran just fine before and I have never even touched any carb settings! Can anyone tell me the easiet way to learn to adjust the SU's?? I will be gone for the next 4 days (holidays!) but I really appreciate anybody's input on this. I will change the fuel fitler and air filter first thing when I get back.....Could the dirty air filter be richening up my fuel mixture by any chance????? Is the stock air cleaner box (big orange unit) any good for performance? Thanks!

cmon guys... no one ever had this problem???

Hi! Can anyone point me in the right direction? I have a 74 260Z with 2 round top SUs which really hesitates and begins to die at speeds greater then 50 MPH. The gas pedal just feels very weak and i can feel the whole engine choking itself to death. It even died a couple times on the freeway (scary!) I know that my valves really need an adjustment (they clang/click like crazy), I am working on that now. However, the car feels really strong at low speeds and I honestly have no idea what the problem is. Also, my gas tank has a small leak which stops once I have less then a half full tank. Every once in a while, everything works PERFECT, and I can go about 90mph with everything workoing fine. Of course, my electric fuel pump is on. The fuel filters look clean. And I have never messed with any carb settings because the car ran good. I am pretty new at this... if anyone has any help I would be gratefull!!!