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Supercharged Dyno run

Discussion in 'Subaru Sambar' started by banzairx7, Mar 12, 2020.

  1. banzairx7

    banzairx7 Member

    Brought the truck in for it's baseline dyno run today. 51hp, 50tq are the peak numbers. Two other important things learned. One is the intake temps skyrocket after just one run and drop the power significantly. We were seeing 42-44hp on runs were the truck didn't sit for a while cooling. It also runs VERY rich. It was all the way down to low 10:1 air fuel ratios in the upper RPM's.

    I've got an intercooler already and just waiting on some more parts and that will be going in. I'll also need to adapt a power commander from a motorcycle to it to lean out the fuel. I've used them on a few cars and they work great for adjusting fuel.

    [​IMG]
     
    Limestone likes this.
  2. Limestone

    Limestone Active Member

    banz,
    Great info. and insight here! Thanks, I'm sure others will agree!
    Limestone
     
  3. Adam Wheeler

    Adam Wheeler Member

    Air boxes on these things are quite restrictive for top end as these don't seem to be ever designed for that in mind, there is also an ACT on the bottom of the air box I believe, that might also be playing into that. What was AFRs at idle?
     
  4. banzairx7

    banzairx7 Member

    We did a run with no airbox and besides the wicked sound of supercharger whine it made no difference. I kind of expected it would. I've got an idea to make a much shorter run to fresh air than through the entire length of the frame. Might not add power but the sound of the supercharger is pretty damn cool IMO.

    What is an ACT? My box just has some vacuum/vent lines going to it.
     
  5. Adam Wheeler

    Adam Wheeler Member

    On the inside of the box some have an Air Charge Temperature sensor, maybe its just the later models or just carb versions as the carb version also has 2 hoses from the exhaust running into the airbox as well which I dont believe the sc versions have.
     
  6. rkrenicki

    rkrenicki Active Member

    That is pretty close to what I was seeing, but I was getting 49-50hp consistently over 5 runs. I did not run an open airbox, so perhaps that is why it was more consistent for me. Here is my graph, I could only put 4 of the 5 runs on here for some reason. The guy running the dyno didnt want to go all of the way to 7.25k

    dynorunShare.png
     
  7. banzairx7

    banzairx7 Member

    I only did one run with the air box open. Wonder why yours was so much more consistent? I ran mine right up to the rev limit which is 7800rpm if anyone was wondering.
     
  8. SDK1968

    SDK1968 Active Member

    im just guessing that you just have too much fuel in the mix.

    bet when you lean it out it will gain some.

    kinda shocked though......... you guys are only getting 49hp with a supercharger? thought the guys with the snowmobile set ups were getting 70ish?
     
  9. banzairx7

    banzairx7 Member

    This motor is only a two valve head, no intercooler and low compression. More modern stuff runs higher compression with 4 valve heads and an intercooler which makes a huge difference. My guess is an intercooler and leaning the mixture out gets me to 60.

    They did make a 4 valve head on the EN07X engine. I haven't been able to find if anyone has swapped the engine or head into a Sambar.

    [​IMG]
     
  10. rkrenicki

    rkrenicki Active Member

    Yep, they went low compression so that it could run on normal fuel in Japan while remaining forced induction. The EN07X from the Vivio RX-R, I am fairly sure required Premium (100RON) fuel.

    The supercharged engine is tuned mostly for the early and very flat torque curve. It does make a little more HP than the carbed version, but the torque is quite a bit higher and comes on much lower.
     
    Limestone likes this.
  11. rkrenicki

    rkrenicki Active Member

    I do not know. This was shortly after a complete engine rebuild, so perhaps the fact that all of the mechanical parts were new helped with the consistency. Nearly every part was replaced.. The block, oil pan, and 3 of the piston crowns were all that remained of the original engine. This dyno run was about a month later after the break-in period was over, and the rings had time to seat.
     
    Last edited: Mar 20, 2020
    Limestone likes this.
  12. banzairx7

    banzairx7 Member

    New supercharger outlet got started yesterday. Might have it done to try and get the intercooler in this weekend.

    [​IMG]
     
    Limestone likes this.
  13. banzairx7

    banzairx7 Member

    Turning this into my power mods thread too. Got the Power Commander 3 USB installed yesterday. The power commander basically splices between the ECU and the injectors and allows you to adjust fueling via a laptop. Once I figured out what wire did what it was pretty straight forward. One thing I discovered is the online manual that has the ECU wiring has the throttle position sensor completely wrong. Everything else seems to check out but that. Here is the wiring for the power commander. Since they don't sell this for anything but motorcycles you'll need to wire it in yourself. For now I pulled out 15% fuel above 50% throttle. Once the intercooler is in it'll be back to the dyno to really tune it.

    upload_2020-3-29_15-27-1.png
     
  14. banzairx7

    banzairx7 Member

    Intercooler is in. Ran into a few issues that I need to resolve. First is I hard bolted the cooler to the bed of the truck. This coupled the supercharger noise to the bed and amplified it like 20x. It is SOOO loud. Rubber isolation bushings on the way! I tried running the straight sections of hose with just silicone hose. It's collapses hard on itself under vacuum. Need to replace it with some stainless tube. Still need to add a scoop to grab air from under the truck.

    As far as effectiveness of the intercooler it definitely helps. Power is more consistent as well as boost. Runs consistently about 7psi now. Before when things got real hot it would go as high as 10psi. The hot air expands so the extra boost from it doesn't help power.

    supercharger outlet adapter. My Lotus 7 kit car is hiding in the background.
    [​IMG] [​IMG]

    Intake manifold adapter pipe. I had the flange laser cut from stainless. The bracket is for the throttle cable.
    [​IMG] [​IMG] [​IMG]

    Intercooler. Brackets were also cut by the good folks @ sendcutsend.com can't recommend them enough.
    [​IMG] [​IMG]
     
    Adam Wheeler likes this.
  15. rkrenicki

    rkrenicki Active Member

    Hopefully all of that extra intake volume isnt a problem for the tiny supercharger. If it is, you may want to step up to an AMR500, or perhaps undersize the pulley.
     
  16. banzairx7

    banzairx7 Member

    I had the same worry about the added intake volume. If it effected the truck I couldn't notice. Boost comes on just as quick before.

    I have two smaller pulleys ready to go for it also. 58mm and 52mm diameters. Stock is 61.5mm.
     
  17. banzairx7

    banzairx7 Member

    Intercooler scoop is on. Going to the dyno on tuesday to tune the motor with the intercooler.

    [​IMG] [​IMG]
     
  18. Ohkei Dohkei

    Ohkei Dohkei Active Member

    That should be really interesting I'l guess 56. Can't wait to see.
     
  19. Reese Allen

    Reese Allen Member

    Yeah, this is a super cool project. I wish I had the fab skills (and equipment) to do this sort of thing.
     
  20. banzairx7

    banzairx7 Member

    MUCH better than expected results. Truck makes 59hp all day every single run. Originally it peaked at 51hp for one run then heat soaked down to 44hp. We probably did a dozen runs tweaking the A/F and it never heat soaked one bit. Below 5k air fuel wasn't too bad. After that had to increasingly pull fuel. Over 7k rpm had to reduce fuel by 22%! It now makes power right up to 7,500rpm and just drops a little bit up to the rev limiter @ 7800. I was thinking I might make 65hp when all is said and done. 70 might be an achievable number.

    [​IMG]
     
    Last edited: Apr 15, 2020
    Adam Wheeler likes this.

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