More Power Mi16 S1!!!
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  1. #1
    Fellow Frogger! racing405's Avatar
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    Icon7 More Power Mi16 S1!!!

    Well, i have finally put the new engine in my 405 and have had it on the dyno today.

    This engine has Cat Cams with vernier pulleys, original valves, upgraded springs and retainers and solid lifters. The bottom end has been ground 0.3mm undersize, nitrided and balanced. I have installed PEC steel conrods and Wossner pistons (11.4:1). The intake manifold and quad throttle bodies are from my older engine and are Jenvey 38mm TBs. I also have the dry sump on this engine.

    While tuning the engine today, we determined that the intake tract needed to be longer - distance from the air cleaner to the trumpets. Adding 500mm of 3" pipe in the inlet made the intake manifold pressure much more stable and increased the peak power by a couple of kw.

    After running the engine under load for 3/4 of an hour to run it in, everything looked fine so we proceeded to load and tune the engine.

    I can guarantee you that we have reached the absolute maximum capacity of the fuel pump and injectors on this engine. The fuel pump is original, but pressure decays rapidly above 7,000rpm and at about 7,750rpm the injectors hit saturation or 100% duty cycle. As a consequence, we have dropped the rev limiter to 8100rpm with a soft cut that comes in at 7600. Hopefully I will be able to feel this on the track and not run the engine into a lean condition.

    Next step will be a surge tank and higher capacity fuel pump + upgrade injectors.

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    Net result is 138.3kw at the wheels running standrad 195x55x15 tyres. This is at 7,600RPM. Torque is remarkably flat so it looks like she will pull through the 8000RPM mark easily. Looks like the mechanical components will probably see 140kW at 8000RPM when I can get the fuel system to keep up.

    I'm pretty happy with that outcome. Will add the dyno chart shortly, will need to re-trace the graph as
    it didn't scann all that well. You will also see where I have added some tipex - we were using injector pulse for RPM reference, and consequently when the injectors go to 100% duty cycle, you loose the RPM speed reference...
    More Power Mi16 S1!!!-img.jpg
    Last edited by racing405; 10th October 2012 at 05:11 PM. Reason: Add dyno chart
    racing 405
    1:59:09 last time at Phillip Island - less than standard Mi16.

  2. #2
    1000+ Posts jo proffi's Avatar
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    Quote Originally Posted by racing405 View Post
    I can guarantee you that we have reached the absolute maximum capacity of the fuel pump and injectors on this engine. The fuel pump is original, but pressure decays rapidly above 7,000rpm and at about 7,750rpm the injectors hit saturation or 100% duty cycle. As a consequence, we have dropped the rev limiter to 8100rpm with a soft cut that comes in at 7600. Hopefully I will be able to feel this on the track and not run the engine into a lean condition.
    Wow thats keen, going above 85% duty cycle at WOT.


    Jo

  3. #3
    1000+ Posts PeterT's Avatar
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    That's very impressive. I'm looking forward to getting mine back on the rollers next week. I guess I'll expect the same issues with the fuel pump.

    '92 205 Mi16
    '90 Mi16x4

  4. #4
    1000+ Posts pgti6's Avatar
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    Well done Ben!

    You must be happy with that result. I'm sure after you've addressed the fuelling issues you'll get your 140Kw.

    A sub 2 min lap at the Island should be in the bag!
    405 Mi16 2.2 litre race car for sale.
    http://www.aussiefrogs.com/forum/car...-car-sale.html
    https://www.my105.com/ListingDetails...d/518/id/22164


    Lap times- Sandown 1 27.9
    Phillip Island 1 53.8

    Previous Frenchies-
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    1976 Renault R16TS manual in Avocado
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    1975 Renault 5 Guernsey, Channel Islands
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  5. #5
    Fellow Frogger! chez00's Avatar
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    Awesome work!

  6. #6
    Fellow Frogger! racing405's Avatar
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    Well, my Bosch 044 fuel pump, adjustable regulator, new hose and fitting, surge thank and secondary filter will all be arriving in the next couple of days. Hope to have the car back on the dyno in the first week of November so that it has a safe tune before the next sprint at Phillip Island on the 11/11/2012.

    Don't know what final power figure we'll make, but I'm betting on 142kw. Will wait and see.....
    racing 405
    1:59:09 last time at Phillip Island - less than standard Mi16.

  7. #7
    1000+ Posts gezza's Avatar
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    Excellent figures

  8. #8
    Fellow Frogger! SilverGTi_6's Avatar
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    Default More Power Mi16 S1!!!

    Wow! Nice work!
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  9. #9
    1000+ Posts PeterT's Avatar
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    I've been on the dyno twice since and am still chasing a miss, although I'm hoping I finally found it late last night - my dodgy wiring to the cam position sensor. So far it's sitting at 127kW @ 7000 and most impressively, a straight line. You can tell it's just busting to unleash the best part. I'm running at Wakefield on the weekend, so will be able to experiment some more in practice tomorrow.

    '92 205 Mi16
    '90 Mi16x4

  10. #10
    Fellow Frogger! racing405's Avatar
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    I hope you get rid of the miss. At 7k, my XU9J4 pulls 132 (on this dyno). It will be really interesting to see where it peaks out when we can keep fuel up to it...

    The boys who run the dyno in Morwell are used to dealing with turbo nissans, fords and toyotas. They are blown away by the way these pug engines develop power and accept timing just like the text book says they should.

    If we get past 140kW, thats properly strong for a NA under 2l motor. WooHoo, watch out here comes 150MPH.
    racing 405
    1:59:09 last time at Phillip Island - less than standard Mi16.

  11. #11
    1000+ Posts PeterT's Avatar
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    I've sorted the miss. It ran fine in practice yesterday, shifting at 7600. There doesn't seem to be a lot more after 7500, which would explain the flat power curve. I suspect the cam timing is advanced too much. It's perfect for Wakefield however. Strange what you said about accepting timing. I had to pull out some more, now down to 22 deg. @ 7000. I tried 23 and 24, but it kept going backwards. Really looking forward to today.

    '92 205 Mi16
    '90 Mi16x4

  12. #12
    Fellow Frogger! racing405's Avatar
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    So, the car came off the dyno this morning, we found no additional power. 138.3kw is the top number, but now the injector duty cycle never exceeds 85%. Maybe I'll sort out a cam sensor for this engine and run sequential injection to reduce the overall injector cycle time and reduce the amount of wasted fuel that is sucked through the cylinder with the cam overlap.

    Phillip Island this weekend, so hope to finally crack the 2:00 minute lap time...
    racing 405
    1:59:09 last time at Phillip Island - less than standard Mi16.

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