11-21-2020, 12:04 PM | #67 |
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S55 EU6 Injectors are: 821g/min
S63 EU5 Injectors are: 903g/min (BMW PN: 13647599876 Bosch PN: 0261500136) Imo 30% over or 1067g/min Injectors would be a good starting point.
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11-21-2020, 06:16 PM | #69 |
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What are our injectors rated at? 750g/min?
Last edited by Bluer2; 11-21-2020 at 07:33 PM.. |
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11-21-2020, 08:48 PM | #70 | ||
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From what I've gathered, for 100% E85 tunes on aftermarket turbos the limiting factor is a drop in fuel pressure as opposed to the injectors being unable to keep up. This to me says that the stock injectors still have some room on the table; exactly how much room is up for debate. On the topic of injector size, I'd imagine that PI would likely offer a higher ceiling in terms of available fuel load being that the fuel-it system essentially doubles injector capacity via redundancy (12 injectors as opposed to 6). When it comes to fueling needs though, does anyone know the extent of how much additional fuel is actually needed? I mean I see the fuel-it system offering 550cc - 950cc injectors, but how much of that capacity is actually needed in order to keep fuel trims stable? Could the stock injectors actually flow an adequate amount with the HPFP upgrade to negate the difference? Everything is theoretical until we actually see results...
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11-21-2020, 09:52 PM | #71 |
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S55 821g/min is what I have.
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11-21-2020, 10:36 PM | #72 |
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Just googling the injector sites I see that a conversion can be done into pounds of fuel per hour for both specs:
S55 DI @ 821g/min converts to 108.6lb/hr (52.1% more than 750cc PI) S63 DI @ 903g/min converts to 119.4lb/hr (9.95% more than S55 DI) Add PI @ 750cc/min converts to 71.4lb/hr (65.75% more than S55 DI) Add PI @ 950cc/min converts to 90.4lb/hr (83.24% more than S55 DI) Disclaimers: this was from Google, not physics class. Max safe flow is 80% as per Bosch, but that's the same across the board, so irrelevant. The late-night calcs above may be wrong, but they do pass a quick smell test... It makes sense that the DI that BMW picked for S55 flows about 50% more than typical old 750cc port injection. It also seems that just the DI upgrade gets you 10% more (lets say 20% just for fun, if these new HPFPs work added miracles). By adding 750cc PI to stock DI it seems you can flow 65% more. Last thought...above may be completely wrong. -TJ
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11-22-2020, 11:05 AM | #73 | |
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11-28-2020, 09:50 AM | #74 | |
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Even if the comparative data isn't complete, did you notice any measurable increase in fueling capacity with the upgraded HPFP and stock injectors on the first customers car? |
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11-28-2020, 01:06 PM | #75 |
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Nothing this monumental is out this long without results unless it doesn’t work...
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11-28-2020, 04:34 PM | #76 | |
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**edit ** I did receive an answer from Spool regarding supported output, but no definitive plots to verify unfortunately. |
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11-28-2020, 09:09 PM | #78 |
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I'm not sure where the S55 data for their statement of 750whp for E85 on stock injectors (without PI or Meth) comes from. The F80Paul website shows the upper limit of full E85 on stock injectors at 575whp with stock turbos. With big turbos you can hit 650whp but you need to reduce E content to E50 or the stock fuel system maxes out. To hit 750whp you need big turbos with E85 and PI.
Right now we are getting best power using E80 with stock turbos and stock fuel system. Sorry if it seems I'm negative on Spool but I'm not. I would just like to see some good comparison datalogs or dyno pulls to see the value.
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11-28-2020, 09:33 PM | #79 | |
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11-28-2020, 09:48 PM | #80 |
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This may be the case with large turbos. With stock turbos and E80/85 we haven't crashed the HPFPs yet...but we're still doing tune revisions.
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11-28-2020, 10:06 PM | #81 | |
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12-01-2020, 03:37 PM | #82 |
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12-01-2020, 03:43 PM | #83 |
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Brand new Carbahn engine was recently installed, still going through break-in.
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12-08-2020, 11:20 AM | #84 | |
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Does the kit show promise from a tuning standpoint? Are the units solid from a quality point of view? |
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12-17-2020, 09:49 AM | #85 |
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Just a heads up for those waiting for additional HPFP offerings.
Looks like 2021 might be off to a good start. I've also been speaking to a representative from Kratos and was informed that their Engineering Department has been working with Dorch Engineering in the testing of these units, as well as testing a Bosch injector upgrade that will be compatible with the stock fueling system. I don't know about y'all, but those are two announcements that I'm now anxiously awaiting to be released. Last edited by MJ6; 12-17-2020 at 10:13 AM.. |
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12-17-2020, 12:37 PM | #86 | |
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12-17-2020, 12:41 PM | #87 |
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With the cost of the HPFP, I am not sure why PI is not an option. Right now the Spool pumps cost more than even a stage 4 Fuel it kit at regular price.
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12-17-2020, 12:47 PM | #88 |
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True, and nothing against port injection at all, I'd just prefer to go the HPFP route and avoid the necessity of an additional controller right now.
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