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Lazeum last won the day on July 1 2014

Lazeum had the most liked content!

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About Lazeum

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  • Birthday 03/21/1980

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    Paris, France

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  1. Lazeum

    Ignition Control Options

    Sorry for late answers. I did not receive notifications.... To answer questions: TPS was easier to setup . With Map I would have been afraid to have pulses issue without tapping all runners together for proper signal. MAP would indeed provide a better resolution and better control but it is not so much required afterall. The mount. I designed it on CAD software and I've asked a machinist I was working with to make itfor me. So he did with CNC machine. If you're interested, CAD file should be available somewhere. If it is not, I can share
  2. Lazeum

    Ignition Control Options

    I've got a megajolt setup on mine and I love it a lot! It has been on my L28 for 5 years without any flows. When it comes to cost, everything including, I came up with a cost of nearly $1000. All the bits and small parts required make the bill bigger than expected Besides benefit of tuning timing for HP, with TPS or MAP control, you will be able to get proper timing at idle and low rpm. Results would be better driveability/smoothness, better low end torque, lower fuel consumption in addition to higher torque and HP. Here's a how-to I've made several years ago
  3. Lazeum

    tripple carb hesitation

    You should go and read the thread about Weber carbs. It is loaded with good info. Regarding your concerns, you need to check and share your setup with different jets sizes before anyone could help you out. Check also your float level with correct fuel pressure, give us details about how you setup the idle screw (how many turns?), the kind of triple you have (45DCOE142 ?), etc. Some were having troubles to tune the newer 45DCOE. The fix AFTER ALL ADJUSTMENTS WERE TRIED was to drill an extra progression hole. Good luck!
  4. I had the issue when doing some tuning for a friend. It happened the brackets holding the pushrods where too close to the carbs, they were rubbing against carb body. We had to add some washers between the carb and the brackets to get some extra clearance. It could also be because the nut of butterfly shaft is too tight. Try to remove the bracket/hardware to control carbs and check if they are still sticky. Your carbs are most likely fine.
  5. Your study is interesting! You should plot the AFR vs. Rpm. It would be easier to compare data.
  6. Lazeum

    Swami's Orange 260z

    Good work with the exhaust and the video! I experienced the same outcome. I've made my own resonator with a friend and the drone / exhaust sound get quieter at steady rpm. Sound at WOT did not change much, which I don't complain about since I love the sound of the L6 with DCOE!
  7. Lazeum

    Swami's Orange 260z

    If you can make it work, let me know. I've tried to make it work, it did for some minutes and then nothing. I either tried datalogging on the MJLJ or on my LM2. It doesn't want to work anymore...
  8. Lazeum

    The dreaded "diff" CLUNK

    A proper designed bolt/nut clamped at the required torque (i.e. use a torque wrench if possible) should be designed to have enough clamping force to hold the mustache bar to the diff tight. The shape/size of the hole doesn't matter as long as it does not interfere with the clamping surface (flange of the nut in our case) The friction between the mustache bar, the diff and the nut matters. I second your advice about making sure there's no grease, dirt or defects in between parts.
  9. I did see a difference at the time where my engine was pinging. Timing change to avoid ping definitely made a difference. Now, I've got a distributorless ignition I can change timing on the fly. I've got some lean AFR conditions at high rpm so I've done some tests. I have not seen any difference in AFR reading with engine running in proper conditions (no ping) So to answer your question: - Engine running properly, Timing does not interfere much with AFR - Engine running poorly, timing could have significative impact.
  10. You should try xxf9 idle jet, they work much better than f8 units on L engine, at least on "old" Italian DCOEs (40DCOE-18). I would try 50f9 instead. It should help to get better acceleration too. Make sure your timing is ok. Too low timing would make the engine lazy and would create bog during acceleration also. Check also the jet deep inside the fuel bowl. Mine are closed with solder, they are 0 bleed jet to get the most fuel possible during accel. 34mm choke on stock L28 is on the high side. I had much better results with 32mm without compromising top end power while tuning some friends' stock L28. I'm running 135 & 34mm chokes with my tuned L28 engine and it is very rich, around 11:1 AFR (at least before engine run out of fuel in high rpm)
  11. Your point regarding probe being partially clogged could be something to doublecheck. That's a good point I always run the car until it is fully warmed up prior to plug my sensor. However, I've lent the sensor to some of my friends, not sure they followed the same procedure. Anyhow, sensor was working well for them with no lean reading at high rpm and I've always experienced off the chart lean reading while at idle at speed, even when sensor was brand new. For the record, I also always calibrate the sensor before any session. This is obvisously something I should have done but it requires to drop the full exhaust. I could do it but it is a major pita; it is customed made, every section is spot welded to avoid it to become loose. Maybe something to think about in the future...
  12. I thought I'd answered your message :/ Regarding my way of doing it is with a clamp made by Innovate. So I drive my car, go at WOT, steady/cruising operation and I record everything while driving. I can put my car on load, record and analyse everything quietly on the side of the road with the laptop. I can change jets along the road and go back. Same goes with timing, I analyze things out, change timing and go for trials. I'm going to order needle jets and see if that could change anything.
  13. Hi, When I say, there is no change, I meant after retuning. Of course, each time I change something around carbs such as fuel pressure or choke size, I have to review jetting. Once it is setup, I always end up with lean AFR at the same rpm range. I'm also suspecting AFR tool. In the mean time, I've lend my sensor to some friends who were able to use it successfully with no problem (besides the ones they were trying to fix - and they both did! (injectors for one, fuel pump for the other, both on s130) - I've also changed my exhaust with the engine. So, exhaust has been also part of my investigation: no leak found, only tubing and tip have been changed. Exhaust manifold and muffler remain unchanged. I've added an intermediate resonator to lower noise level. - I measure AFR with Innovate exhaust clamp at exhaust tip, maybe something to investigate. I could add a copper tube to the clamp to get some gas deeper from the exhaust to avoid any potential wave reversion issue plausible. AZGhost623, you haven't said what are the needle valve you're running with your setup? Are they 200? Regarding Didier's commment... no comment!
  14. Just to give some updates and also to try to get new ideas from members in order to solve my problems with my setup. A quick summary: since I've got my motor running with head made by Braap with Rebello "Street tight lash" cam, short block fully rebuilt by myself and distributorless Megajolt/EDIS ignition, I've never been able to eliminate some lean AFR at high rpm. My carb setup is as follow: 40DCOE18 with ported Cannon manifold on the carb side, enlarged at head side but still smaller than head ports. Main 135 air 180 F11 Etube 34mm chokes 4.5" aux venturis 45f9 idle jets 45 accel jets with 0 bleed valves 200 Needle jet Car is very responsive, pulls hard. It is very smooth to drive at all rpm. I can floor it (fast to some extend though!) in 3rd gear at 1200rpm and engine just goes with no problem. I'm basically missing only some hp at high rpm (too lean) where I can feel torque getting down around 5000rpm whereas it should go up to 6000rpm, as well as at mid rpm, being too rich. So I've tried to use systemic approach (fishbone/Ishikawa method) to my problem and eliminate one by one every problem I could foresee. Undercarbed intake: I've played with choke sizes, between 32mm and 34mm. It did not change anything. I consider undercarb situation not the cause of my problem (even if I need 45DCOE ) Carb tuning I've played with jets: - Main jets change the entire AFR curve. Lean spot becomes richer but AFR at mid rpm becomes also very rich. To be at 15:1 AFR at 6000rpm, I need to be at 11:1 at 4000rpm. - Air jet does not change anything at high rpm. I've been as small as possible (165), I ended up with engine cutting/starving fuel in tight right corners with no positive side effects. - Idle jet does not change anything either. - I've tried to plug the top holes on my F11 etube, I haven't observed any change at all. here's the curve with current setup during Etube test: Fuel supply NOK - I've changed fuel pumps from Carter unit (@3.5psi) to Mallory unit (at 2psi - for some reason I could not go higher) Result was some AFR translation, the AFR trend across rpm range was the same. As soon as I've changed main jet to get back to reasonable level, curves were similar. Fuel pump is not the cause of my problem. - Fuel lines Could some lines being clogged? I've changed all filters by new units, no change. Fuel tank has been cut open in 2, sanded, welded back together and it has received a full treatment to avoid corrosion. I've installed a fuel pressure gauge on my dashboard; fuel pressure is steady across all rpm range, including at red line. So I've put fuel supply at carbs out of the picture. - fuel bowl level. It is exactly the same for the 3 carbs. I've got 25mm from the top of the carbs cover to the fuel level. To check that, I keep cover on, remove etube and use a straw/tube from a can of WD40 that I deep into the carb while plugging the other side with my finger. Everything is spot on. - Fuel filling I've increased the travel of the floats to make sure needle valves were fully opened with fuel level being very low, it did not change anything. Timing NOK since I can play with timing I thought I might be so off timing could be a reason. I was running 34° max, I've tried 30° max, I've also tried 36°. There was no change at all on AFR curve. I've put timing out of the picture. So I start to be short on ideas. Something is not ok and I don't get it. Test on Etube seems to lead to some issue with fuel level, no change with clogged top holes tends to let me believe fuel does not go high enough around etube at WOT. So next test would be to try bigger needle valve, even if 200 seems quite big already. I also suspect the machine work I've done on intake. I've "just" enlarged the intake mostly at carbs side. Intake ports were smaller than carbs so I've made sure no step would stop air/fuel mix. Maybe I've made a thin/wide/thin condition leading to my problem. However, fuel and air are already mixed at that point, it would not explain why the engine runs lean. So.... what am I missing??? I need fresh minds to propose some new ideas. ...and thanks for the ones who read everything
  15. Lazeum

    Tips on the ever popular turbo swap

    I've done it many times, you can remove an oil pan from a S30 without lifting the engine. It is quite easy, you just have to tilt the pan in many directions without brute force to pull it out. N42 should have some square port but I believe there are some exceptions with some heads from Japan. If the head is the stock unit coming from your 280Z, you should be fine.