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  1. kidturbo

    Twins with Twins, Anyone?

    She's Single... Sent from my SAMSUNG-SM-G890A using Tapatalk
  2. kidturbo

    Twins with Twins, Anyone?

    Yeah spool and EGT are two concerns in a boat. The twin setup is supposedly more responsive down low [better curve] than big single on a gasser, so was following that plan. Just thought we could pick up where Banks left off on this design. But soon realized why he added the blower atop, to...
  3. kidturbo

    Twins with Twins, Anyone?

    Thanks Josh. I'll let ya know after we test the options we have on the schedule for Thursday.
  4. kidturbo

    Twins with Twins, Anyone?

    Yeah Mark broke out a stack data logs, maps, and a calculator. Everything points in that general direction. Trick is finding best etup now that runs clean and doesn't have a bunch of drive pressure and EGT. Nelson is willing to work with me to develop a smaller custom symmetrical turbine...
  5. kidturbo

    Twins with Twins, Anyone?

    850 -950 Sent from my SAMSUNG-SM-G890A using Tapatalk
  6. kidturbo

    Twins with Twins, Anyone?

    Below is our engine RPM to boat speed chart. Current drive gearing and prop selection is setup in the blue section. It's pretty straight fwd 1:1 trans gear ratio, like driving a stick stuck in 4th gear. We do have a 2spd trans, with 1.50:1 first gear that can be used to help get boat on on...
  7. kidturbo

    Twins with Twins, Anyone?

    Might have to change topic to just Twins... Gonna toss a S475 on it to get some data, then decide which way to go. We need more boost to bring the power curve up and keep it clean. Finding that range map in symmetrical twins isn't looking very promising at the moment. Sent from my...
  8. kidturbo

    Twins with Twins, Anyone?

    Here is nice little WOT pull that told the tale on those twins. Open scrolls, peaking out at 30psi and 730hp corrected. She sure is a happy camper there. https://youtu.be/MLXG2bSWb9s To warm this one up, we ran about 3 minutes loaded at 50% throttle to emulate normal cruising speed in the...
  9. kidturbo

    Twins with Twins, Anyone?

    No positive conclusions on misfire cause yet. Gotta review some more data, and check runout on first engine reluctor ring. We only moved the bail connectors further away from injectors, and removed those scroll block off plates. Then this engine was also logging multiple cylinder misfires at...
  10. kidturbo

    Twins with Twins, Anyone?

    Was able to resolve the RPM / misfire issue with Factory harness and ECU. However when we opened up the Scrolls in the turbos here is the final results.. Sent from my SAMSUNG-SM-G890A using Tapatalk
  11. kidturbo

    Twins with Twins, Anyone?

    For sale. Two beautiful like new symmetrical 61 mm turbos. Would work great with triples. Only requires a lot of RPM or cubic inches... full dyno analysis included. Feel free to make offers... Sent from my SAMSUNG-SM-G890A using Tapatalk
  12. kidturbo

    Twins with Twins, Anyone?

    Was your ears burning? Might give ya ring later to discuss our findings. Sent from my SAMSUNG-SM-G890A using Tapatalk
  13. kidturbo

    Twins with Twins, Anyone?

    Twin 61mm mirror image from Nelson Racing. Turbonetics builds them. Sent from my SAMSUNG-SM-G890A using Tapatalk
  14. kidturbo

    Twins with Twins, Anyone?

    Yeah it should be clean, but these were really clean with zero residue. There was a good film on the inlets where they sneezed on d-cel. No one has pushed these turbos over like 24psi before. Gotta remember, they've only been used on gassers, and then gated.. No catch can built yet. Wanted to...
  15. kidturbo

    Twins with Twins, Anyone?

    Second engine bolted up and hope to have some data tomorrow. Did a quick inspection of first one yesterday. One thing we noticed was how clean the intake runners are after a dozen holds at 32-3600. Turbo inlet horns showed a little discharge after each run, but on the pressure side not a drop...
  16. kidturbo

    Twins with Twins, Anyone?

    Bolting second engine up today. Am curious to compare two identically matched setups. Have plenty of data off first one, and a good bit of brain power onboard to analyze results. Thinking about ya Sting.. The load or hooking power seems to be a key. As Larry over here put it, that dyno has...
  17. kidturbo

    Twins with Twins, Anyone?

    Thanks for the input guys. Those are the first two approaches we are thinking also. Started working towards the testing gap options, thinking it might be the easiest to validate. Just didn't have time to follow thru yet, and wanted to get some time on second engine since this one has proven...
  18. kidturbo

    Twins with Twins, Anyone?

    This crank cam sensor pick up situation deserves its own topic. But here is the short and sweet on what's Happening. First Mark broke out an old tool that was new back when he or I were in college. Since neither of us really wanted to sit beside an engine making 700 horsepower...
  19. kidturbo

    Twins with Twins, Anyone?

    Well after a couple hours of messing around and testing everything electrical, Mark and I took a new approach towards this misfire situation... https://youtu.be/A6zqu_9Sb7w Sent from my SAMSUNG-SM-G890A using Tapatalk
  20. kidturbo

    Twins with Twins, Anyone?

    Pretty much only does it once load applied above 3600. But ECM is tracking cyl misfires at idle now after changing driveshaft. So that's weird. I was thinking a analog scope also. I'll check voltages on everything too. My little $35 digital setup won't give me voltages on those patterns.
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