Duramax Diesels Forum Truck of the Week
  #676  
Old 10-17-2018, 09:26 AM
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Twin 61mm mirror image from Nelson Racing. Turbonetics builds them.

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  #677  
Old 10-17-2018, 03:41 PM
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You position sensor noise is because of how you are tapping into the signal. Called common mode voltage. There are many ways to get rid of it, but I would need to know more about your setup.
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  #678  
Old 10-17-2018, 04:57 PM
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Was your ears burning? Might give ya ring later to discuss our findings.

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  #679  
Old 10-19-2018, 07:04 PM
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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...

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  #680  
Old 10-19-2018, 07:49 PM
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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..

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  #681  
Old 10-19-2018, 09:31 PM
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Does that mean the issue was cross talk on your harness? Might be interesting to track that down, if it didn't require load to mess with it.

So those turbos only good for ~625 HP, if I'm seeing it right? (Graph is fuzzy on my phone) What do you have in mind to replace them?

What was the limiting factor? Drive pressure ratio? Shaft RPM? Started coming apart under high boost? Having killed a couple S371s due to excessive RPM nuking the bearings, I'm curious if this is a similar problem.

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  #682  
Old 10-19-2018, 10:10 PM
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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 idle, but pulled fine to 4200. Making less torque at same rpm however. So few things left to hash out yet.

On turbos, just to dang big on exhaust side for this type of setup. We was thinking they might finally light off around 3800r and spin up to make 45-50psi up at 5000r. After a couple tuning adjustments, was obvious that wasn't gonna happen. Engine ran outa camshaft by 4100 and they were only making like 30psi.

With single scroll blocked off, they would likely made 40psi and mid 700hp tops. Nowhere close to where we need to be. So going to toss a big single on there and see where it lands. Other option would be stick a small blower on top of em like Banks did it. But that opens up whole new set of known issues.

Besides that, both engines performed well as expected in all other aspects. Ran cool and clean at part throttle, and should live happily at 700hp 1100ft-lb all day long. But customer wants to see what they can actually do..




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  #683  
Old 10-21-2018, 12:17 AM
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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 boat. Was only making 4-8psi, where I would like to see about 12-17psi. Besides that, all the other data looked really good. FTEMP is actually Oil Temp in this pic.
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  #684  
Old 10-21-2018, 05:48 PM
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What is the next step for the turbo setup? I know it’s twins with twins, but have you considered going to a proven single turbo setup?
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  #685  
Old 10-21-2018, 06:48 PM
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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.

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  #686  
Old 10-21-2018, 07:32 PM
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What's the minimum rpm that these will likely see while under load? Or guess I should ask, what rpm will they rev to before the props really start pushing water? Obviously you could change that, but didn't know what the goal was. Sorry, kinda boat dumb here
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  #687  
Old 10-21-2018, 09:57 PM
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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 plane. But beyond about 40mph, she's locked in high gear.

The rpm to speed scale is based on a prop slipping factor of 15%. That's typically good as ya get on big pitch props. The scale is pretty accurate above 3000rpm. Below that rpm, the slip % will be higher, like in 20-30% range. That said, chart shows 1700RPM at around 40mph. Probably the slowest boat will stay on plane, and hard bottom of normal operating range. Need to start making some boost at part throttle around there.

Second, graph shows speed by gear position and RPM. The green block is expected shifting speed range.
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File Type: jpg Boat-Speed-2spd-35P-Shift.jpg (124.7 KB, 39 views)
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  #688  
Old 10-22-2018, 06:56 AM
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What is the peak horsepower goal?
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  #689  
Old 10-22-2018, 08:49 AM
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850 -950

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  #690  
Old 10-23-2018, 06:49 AM
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I really liked the single 472 I ran at that power level. It was fairly responsive and made good power.
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