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Chickenman last won the day on May 12 2017

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  1. Mystery Big Valve Ported N42 Head.

    1976 Nissan Comp Catalog. Note Part # 13001-E4651. Big $$$ even in 1976.
  2. Mystery Big Valve Ported N42 Head.

    2012 Nissan Motorsports manual:
  3. Mystery Big Valve Ported N42 Head.

    Biggest issue is with a reground Cam, you are " lift limited " by the duration profile. To get more duration at the Nose, you have to grind the Peak or Toe of the Cam. That means you've now reduced the effective " Lift " of the Cam. To get the Lift back, you have to reduce the Base-Circle Diameter or Heel of the cam. You can only go so small with a Base Circle, before you start running into geometry and Valve acceleration issues. Make the Acceleration and Deceleration ramps too aggressive, and you end up with Valve Train instability and short component life. On some re-grinds, they have to " undercut " the core diameter of the Camshaft. That means that they actually reduce the diameter of the Camshaft BETWEEN the Lobes in an effort to get the Base Circle diameter smaller. Of course that can weaken the camshaft core as well. Now, if you start off with an unground new " Billet " camshaft you can get a LOT more lift and duration than a regrinds. Because you have all that extra metal to use on the Profile. It's not unusual to see Datsun L series Race cams ground on a fresh cam Billet having .600" + Valve lift ( 1.54 Rocker ratio ) . That would be impossible on a reground Camshaft.
  4. ^ Techno toy tuning makes some very nice Weld in plates and Camber plates. You won't go wrong choosing TTT.
  5. 280zx ignition module with Megasquirt - is it necessary?

    With the ground shield it must not be connected to the engine block or Chassis. Only to the inside ECU ground. Having grounds at both ends can induce an offset voltage into the ECU sensor ground circuit. You don't want that. Messes up sensors. I've heard of MS custom builders using a separate box outside of the main MS ECU box for exactly the reasons stated above. To reduce any internal EMI created by the Power transistor ( BIP-373 ). Very good idea with WasteSpark or COP coil drivers that would have multiple BIP373's. The Nissan Module could certainly be triggered and controlled as a Single channel dumb coil driver. That's exactly what it is. Be sure to mount it to a good heat sink though. Those modules get very hot. The distributor body acts as a heat sink from the factory. If not mounted to a heat sink it will fail in short order. The Nissna " Matchbox " module is pretty stout all by itself. You can use an old AMD style CPU Heatsink and fan to keep it cool. Fan may not even be needed. Make sure you use a good thermal conducting compound between the Module backing plate and the Heatsink.
  6. 280zx ignition module with Megasquirt - is it necessary?

    Advantages to running an external Ignition Module: 1: Ignition modules are noisy electrically ( EMI ) . For that reason, some builders of MS prefer to keep the high current Ignition coil drivers ( BIP373 IGT) outside of the ECU box. Or they build a Faraday cage around the Power Transistors. An external Module, be it a Nissan Matchbox module, aftermarket Ignition amplifier, such as a Bosch or DIY Quadspark unit or even a CDI box, will be isolated outside of the ECU as far as EMI noise is related. Very few manufacturers such as Haltech, Link Adaptronics, or AEM, ever include the High Amperage draw IGT drivers isiden the ECU. They all use external modules to reduce EMI. Logic coil drivers are not the same thing. They are low amperage circuits and don't produce the EMI that the IGT BIP-373 coil drivers Advantages of BIP 373 drivers ( IGT ) 2: The BIP373 drivers are cheap ( $8.50 each ) work well and provide a slightly cleaner install over external modules. We are referring to dumb coil packs of course. Logic coils such as LS2 do not require IGT coil drivers. Cons of external Modules. 1: More cost if one has to be purchased. Can be quite expensive if going more than a single coil. You need at least a 3 Channel coil Module for a 3 Coil Pack Wastespark system. That can be fairly expensive. Although you can sometimes find used 3 Channel Bosch modules for a reasonable price. . Audi V6 and BMW inlne 6's prior to about 2000 had these. 2: Additional wiring. The Nissan matchbox module would have to be re-wired to use the Programmable Timing curve features of the MS. And the distributor would have to be locked out. Not really a Module issue, but rather a choice of distributor type. Cons of Internal coil drivers. IE ( BIP-373 IGT coil drivers ) 1: They produce an ENI field. Nota good thing to have inside an ECU with very sensitive micro-orocessors. 2: They get hot. The more of the BIP-373 drivers you have, the more heat is pumped into the ECU case. Heat is not good for electronics. Worst case scenario for an L-6 would probably be three BIP-373's firing 3 x Waste-Spark " dumb " coil packs.
  7. 280zx ignition module with Megasquirt - is it necessary?

    Shielding should only be grounded inside the ECU. The other end should never be grounded to anything....
  8. L28et Dizzy no rpm Ms2extra

    I think Issa has a faulty CAS sensor as well. Trigger and Tooth logs are all over the place and intermittent. Car ran great one run, then as I watched in real time, the Tooth logs took a dump and the car died. Trigger logs and Tooth logs were very broken up. Think CAS said.... Buh Bye!!
  9. magasqirt wiring diagram

    If using an MS1 or MS2 and stock Nissan injectors ( Low-Impedance ) then I would strongly suggest using the factory dropping resistors. For some reason the MS1 and MS2 Pulse Width Control Limiting is a bit flaky with the Nissan Jecs Low-z injectors. It's hit or miss if it works correctly. If you change to different injectors I would suggest going to Hi-Impedance to save yourself from headaches. The MS3 PWCL drivers seem to be fine. MS3 uses entirely different coding though. IMHO it's firmware is much better than Ms2. Less " quirky "
  10. magasqirt wiring diagram

    There are different hardware manuals for Version 3.0 and 3.57 main boards. You didn't state what you have. but here is MS2 version 3.0 main board.
  11. magasqirt wiring diagram

    MS extra forums are the best place to find info like that. The MS2 Hardware manual will have what you want. http://www.msextra.com/manuals/ms2manuals/ And just to reiterate, the MobyTheVan articles are really ancient history. Much better ways to do things now.
  12. magasqirt wiring diagram

    There's been considerable changes to the Installation procedures since the MobyTheVan article. For instance, the development of the DIY L28 Trigger wheel. This is much more up to date. https://www.diyautotune.com/support/tech/hardware/nissan-trigger-disc/
  13. 280zx ignition module with Megasquirt - is it necessary?

    I would use the BIP 373 drivers in the MS. Switch to a crank fire trigger wheel or install the 82-83 280ZX Turbo distributor with Optical CAS trigger. With the Turbo CAS distributor you will have to purchase the DIY Custom trigger wheel for the L27ET engine. The advantage of using a Crank Wheel or CAS distributor is that now you will have fully programmable ignition timing. With three BIP373 coil drivers you can run Waste-spark spark ( 3 x twin tower coil packs.) and Batcfh fire injection on an MS2 If you add in an MS3X expansion daughter board, you can have full sequential fuel injection and 6 individual COP ignition coils on an MS2. Look on our Vendors forum. Softopz is a MS distributor and he can either build you a new ECU or repair/update the ECU you have. He also makes excellent Plug and Play custom harnesses. http://forums.hybridz.org/topic/128308-megasquirt-plug-and-play-harness-and-pre-configured-ecus/ It may be a good idea to send the MS2 ECU to him and check it for any hardware issues. MS units can be built many different ways. And the build quality of course depends on the skill of the builder. used units can be a crap shoot. If you need Tuning, I can help you with that. I Remote Tune MS1, MS2 and MS3 ECU's. primarily for the Datsun L-serie's. You can PM me for more info.
  14. To bore or not to bore

    When you re-ring it, use regular Cast Iron rings... not Moly. Cast Iron rings with bed in nicely on a hand hone. Moly rings require a very fine and precise finish that cannot be duplicated with a hand honing tool. My L28 was hand honed and assemble with Cast Iron rings and it has virtually zero oil consumption.
  15. L24 vs L28 crank pulley

    Need a quick brain refresh on this. Hectic day so don't have time to research. L24 crank pulleys and L28 crank pulleys have their respective TDC marks in different locations correct? As I recall the L24 Ignition timing tab was on the drivers side ( Distributor ) side. L28 has timing tab or Arrow on Passenger side. Alternator side correct? ( Because of AC on 280Z and ZX. ) Person has put a L24 crank pulley on an L28. Timing Tab is just an arrow mounted on Passenger ( alternator ) side. That would put the timing marks out around 120 degrees? Correct?