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Thread: 260z performance improvements

  1. #1
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    Default 260z performance improvements

    Ok I am aware of the popular L28/L28ET swop, but if I want to keep the orig L26 engine is there any proven ways (not to cost prohibitive) that can noticeably increase performance (say hp & torque up by +20% ?). Only mod I have made so far are early 240z carb's..Are stroker build for L26's available/worthwhile ?

    Apprecaite your thoughts.

  2. #2
    Registered User Gary in NJ's Avatar
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    You need to set a budget. 20% is a significant increase, requiring head work (cam, valves & porting), a high flowing exhaust (2-1/2" piping) and some boring of the cylinders.

    Unfortunately there aren't many (any?) bolt-ons that will release magic horsepower. With the L-series engines it all comes down to cubic dollars.
    Gary
    Guardian of HLS30-91415
    Previous Owner of a 10/70 240Z ('83-'85)

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    Yep cubic $$$= power............

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    My budget ~ $3k

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    Nova Scotia,Canada,Earth Blue's Avatar
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    < $800 L28 block with Zx distributor
    < $1500 head, cam, valve job, porting, gasket set
    ~ $700 poly kit, new shocks and springs

    You will be very happy.

    A smaller diameter steering wheel is very nice too.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  6. #6
    Nova Scotia,Canada,Earth Blue's Avatar
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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  7. #7
    Registered User madkaw's Avatar
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    Triple Mikuni's were advertised as a 18% boost in HP, back in their day.
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    $3K ???

    First option is to buy an engine that someone else has spent $6K+ on - when they feel the need to move up again. Lots of guys have really great L series engines - for sale - when they decide to go with a SBC.
    Here is a real deal - if it isn't already gone. You would have to buy a new ECU..
    http://forums.hybridz.org/index.php/...st__p__1001801

    Edit .. Oops...didn't read far enough... It was sold!! Nonetheless, wait and deals like this come up...

    Second option would be to check with Rebello - and see how much he would charge to rebuild your L26 in a mild street mod set up... might be a bit over your $3K - but you would be very happy with the results... It is a case of spend more up front - and be happy vs spending less up front and then spending more and more as you try to fix problems...

    FWIW,
    Carl B.
    Last edited by Carl Beck; 06-02-2012 at 07:44 AM.

  9. #9
    Supporting Member Zedyone_kenobi's Avatar
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    might be over 3000 dollars. HAHAAH

    I promise you it will be, that is if Dave does not try to talk you into a 3.0 rebello for 9000 dollars.

    I only say that as in the three times I called him to rebuild my stock L24, he had tried to talk me into a 9000 dollar rebello stroker all three times.

    I do not totally blame him, as that is his ace in the hole. But the pressure sales pitch turned me off. NO doubt he builds wonderful motors that would run for years!!!!! And for the record Dave was very friendly the whole time. Easy to talk to, but he is quite the salesman!

    I would say give Eiji a call at Datsun spirit, and just talk to him. Not one time over the phone or via email did he ever try to upsell me one time. And his work is mind bendingly thorough. He will create a photo bucket account for your build. Mine has 167 photos in it right now. I am quite simply blown away.

    However, should you try to rebuild it on your own, that is certainly a great idea as well...just read as many books as you can.

    remember, knowledge = HP, money is just a catalyst.

    Blues budget breakdown is really pretty darn close to reality. The HP is in the head. And that is where you money should be spent.
    Last edited by Zedyone_kenobi; 06-02-2012 at 07:51 AM.
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

  10. #10
    Supporting Member Diseazd's Avatar
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    Well put Zedy......you're right about Eiji. His motors are a thing of beauty and perfection.....well worth the wait.....and the head is where power comes from.
    http://www.flickr.com/photos/1404980...7600346077563/
    ______________________________________________
    http://www.flickr.com/photos/1404980...7603350695459/

    70, 71, 2 72's, and a 73 240z....
    90 300zx and a 1996 Acura NSX.....but who's counting?

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    Registered User Hunter260Z's Avatar
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    I know this is an old thread,but i'm at the point where i need some more horses.I don't want a big block, I have a few ideas,so I will start.

    1. Replace the timing chain.
    2. Replace the 74 e-88 head with a 72 E-88.
    3. Rebuild SU carbs or send them to Z therapy.
    4 Purchase a stage II cam.
    5 Purchase a header and 2.5" exhaust.
    6 Add 5 speed trans and 3.9 diff.

    Any ideas would be helpful.
    Ray
    1974 Datson 260Z
    RLS30-27748 Matching #'s
    L26 Stock w/72 Round Tops
    Interpart Front Spoiler
    Addco Front & Rear Sway Bars
    My Very First Car
    Purchased 5/23/1974

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    Registered User Hunter260Z's Avatar
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    The main reason I said I didn't want a big block was I have nowhere to store the old motor. My garage is full.
    Ray
    1974 Datson 260Z
    RLS30-27748 Matching #'s
    L26 Stock w/72 Round Tops
    Interpart Front Spoiler
    Addco Front & Rear Sway Bars
    My Very First Car
    Purchased 5/23/1974

  13. #13
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    Triple Webers
    Late 260Z; 2005 Daytona Blue paint; Triple Webers 40DCOE; competition springs w/Tokico HP shocks; Koenig 17x7 Crosshairs w/ Yokohama AVS 215/45 WR 17; Original owner; Show car w/ many awards

  14. #14
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    Do you already have the 72 head? Is it a late or early head?
    You don't need the "big Block" , you need the head work. There is a guy on hybridz selling a e31 head ready to bolt on!!
    Spend your money on the head first, then the trans and gearing will liven things too. Good ignition and tune tune tune.
    Like said above, triples will help a lot
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  15. #15
    Registered User Hunter260Z's Avatar
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    I need to find a early 72 head,then look about a stage II cam. My SU's have app. 65,000 miles on them, but the Z runs great. Back in the late 70's I drove a 260 with triples, stage II cam (crane),header,and head with big valves. This was a totally different car.
    Ray
    1974 Datson 260Z
    RLS30-27748 Matching #'s
    L26 Stock w/72 Round Tops
    Interpart Front Spoiler
    Addco Front & Rear Sway Bars
    My Very First Car
    Purchased 5/23/1974

  16. #16
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    1. Replace the timing chain.
    2. Replace the 74 e-88 head with a 72 E-88.
    3. Rebuild SU carbs or send them to Z therapy.
    4 Purchase a stage II cam.
    5 Purchase a header and 2.5" exhaust.
    6 Add 5 speed trans and 3.9 diff.
    ==============================

    have items 3,4,5, & 6..if I was to do it again my only change may be to keep the orig manifold. ...these Cars are loud with manifolds & 2.5" exhausts.
    You may also want to upgrade the ignition. The Tranny & Diff upgrade make a real difference...

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