At 'Cars & Coffee' this morning...
| Slant Six Forum https://slantsix.org/forum/ |
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| ProCycle's FI Turbo build https://slantsix.org/forum/viewtopic.php?f=12&t=56352 |
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| Author: | ProCycle [ Thu Jul 07, 2022 8:46 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
The turbo is original equipment on a Dodge 5.9 Cummins. Comparing displacement and RPM range the Cummins and the Slant have pretty much equal CFMs. The Cummins would see about 28 PSI of boost. All good so far. The thing is nobody ever wants to run low boost on a diesel so being able to adjust the boost down to around 5 PSI just isn't designed in to the system. After reading through a great many turbo forum threads I've absorbed a few nuggets of wisdom. The wastegate is always fighting against exhaust drive pressure which is almost always higher than boost pressure. Internal wastegates have to be small and will have limited wide open flow. External ones can easily be big enough that they don't limit flow but they will still be forced open when drive pressure overcomes the spring. A rough rule of thumb says a regular (single port) boost referenced wastegate and boost controller can only control boost up to double the spring pressure. A wastegate with a 5 lb spring can limit boost to 5 PSI with full manifold pressure and maybe as much as 10 PSI when the boost controller blocks manifold pressure to the wastegate when drive pressure overcomes the spring. The way to go beyond these limitation is to use controlled air pressure or CO2 to assist the spring. This is 'dome control'. I'm still trying to wrap my head around how this gets set up and managed. |
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| Author: | ProCycle [ Sat Jul 09, 2022 6:02 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
At 'Cars & Coffee' this morning...
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| Author: | Dart270 [ Sun Jul 10, 2022 4:47 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Most excellent. One of the weirdest and coolest rides on planet Earth. Lou |
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| Author: | ProCycle [ Sun Jul 10, 2022 8:08 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Dart270 wrote: Most excellent. One of the weirdest and coolest rides on planet Earth. Lou Some minds were blown 
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| Author: | ProCycle [ Mon Jul 11, 2022 6:02 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
I fabbed a bracket to hold the Windows tablet. Gauges and tuning software in easy reach. 
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| Author: | ProCycle [ Mon Jul 18, 2022 3:22 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Getting started on the external wastegate  
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| Author: | ProCycle [ Sun Aug 07, 2022 6:27 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
After some teething problems with the new wastegate I can finally hold boost down to 5-6 PSI. Here's a data log from a 2nd gear pull I did last night. The white line is RPM from about 2300 to 4000. Yellow line is boost which initially climbs to 5.4 PSI and only creeps up to 6.1 PSI That's about 7 seconds of full throttle. The data log software (MegaLogViewer) says it's making about 135 HP at 4000 with 6 PSI. 
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| Author: | ProCycle [ Sun Aug 07, 2022 12:22 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
I got out early this morning while it was still cool for another ̶h̶o̶o̶n̶i̶n̶g̶ tuning session. Below is the fuel table from TunerStudio 'VE Analyze Live'. With VEAL turned on you just drive around, paying attention to where the little blue oval is. The idea is to run various combinations of RPM and throttle position to hold the oval in the cells you want to tune. To read the table the horizontal scale is RPM and the vertical scale is intake manifold pressure. Any cell over 100 is getting into boost. In this pic the oval is near idle. The cells with blue numbers had some fuel added while the cells with red numbers had some fuel decreased. The black numbers were not changed. The upper left triangle of the table, about 1/4 of the whole grid are cells that it's pretty much impossible to visit. The torque converter won't let the motor get to low RPM high load areas. The lower right corner can only be visited momentarily when chopping the throttle at high RPMs.  I also did another better full throttle pull. This time from rolling at 20 MPH in 3rd gear and lifting at 100 MPH. This is about 19 seconds at full throttle. Boost is nicely stable from 5.4 to 6.3. Yellow = boost, White = RPM, Red = speed, Green = horsepower. 
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| Author: | Rick Covalt [ Thu Sep 01, 2022 6:00 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
How did you do at Woodburn? 
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| Author: | ProCycle [ Fri Sep 02, 2022 11:22 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Rick Covalt wrote: How did you do at Woodburn? My trip to Woodburn was a bust. As soon as I unloaded off the trailer the truck started running like crap. Way lean, misfiring, would barely move under its own power. I did get it teched but didn't even try to make any runs. I've spent the last week trying to figure out what went wrong. |
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| Author: | Dart270 [ Fri Sep 02, 2022 1:59 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Buggah! Better luck next time. Lou |
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| Author: | Greg Ondayko [ Tue Sep 20, 2022 3:41 am ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Drats, that's no fun.. I bet it's some input thing making the computer go wild on fueling / timing or some other parameter. I have a loose temp sender wire or a bad sender that is allowing my temp input to vary wildly when driving over bumps. 200° to -20° in a matter of a 1/2 second, then when the road smooths out it's fine. I do need to get that corrected and sorted out soon. Greg |
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| Author: | Jack Ormson [ Tue May 23, 2023 2:33 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Any updates on the prodject? |
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| Author: | ProCycle [ Tue May 23, 2023 5:12 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Jack Ormson wrote: Any updates on the prodject? All progress stopped with the long wet winter. However, I won't get back on it for a while. I'm in the middle of moving from Oregon to New Mexico. No more long wet winters for me! The only update I have is that the last trip was moving the Slant S10 down to NM. Attachment: Delivered-2.jpg [ 162.72 KiB | Viewed 1060 times ] |
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| Author: | Greg Ondayko [ Tue May 23, 2023 6:44 pm ] |
| Post subject: | Re: ProCycle's FI Turbo build |
Is the procycle shop also moving to New Mexico? |
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