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Join Date: Aug 2014
Posts: 29
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Bitz EFI for 3.0 Turbo conversion
Hello looking for advice
Motor: 1983 sc 3.0 - Turbo conversion I Have a BAE kit - -planning on going no more that 10psi Going to do the Bitz EFI conversion Is the accel injectors @ 30lbs/pr hr that are recommended with the kit enough fuel Or - should I go with more? Any help would be great thanks! |
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02-09-2022, 09:35 PM
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i don't think 30lb/hr will cut it. I started with 44 lb/hr on my '77 930 and it was not enough but I am running 17 psi (1.2 bar). You should be safe with 44 lb/hr injectors for 10 psi boost. That will support 350 bhp without exceeding 80% duty cycle of the injectors.
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-Dennis 1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R |
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02-10-2022, 07:20 AM
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Join Date: Aug 2014
Posts: 29
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Quote:
Thank you, I appreciate your real data input here! Cheers! |
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02-10-2022, 09:33 AM
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Dennis, how much horsepower is your 77 930 putting out?
Rahl
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1976 930 turbo Carrera, "Ubich". Mostly stock, lightly sweetened. She’s an angry schwierigkeit. She doesn’t want flowers, she just wants to dance! And when she does, she shakes her hips to the rythem of the road. Drive her like you hate her! |
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02-10-2022, 01:07 PM
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Rahl,
I have not dynoed the car but I am maxing out the 55 lb/hr injectors currently installed. I was over 100% DC on the injectors at 6000+ RPM's until I retuned injector timing to get all the fuel in before the intake valve closes. Now around 95 - 98% DC. Need bigger injectors to support the GTX3576R I have not installed yet. I think there is too much exhaust back pressure with the GTX3071R currently installed. I would estimate around 425 HP right now.
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-Dennis 1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R |
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02-11-2022, 01:12 PM
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The bitz efi is based on megasquirt 1 which is extremely old technology. I would go with a better ECU.
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'86 930 Guards Red - EFI MS3Pro, 80lb inj, 3.4, GT35R, Tial 46, Bosch 044, B&B Headers, 3.2 carrera manifold, Turbokraft Full bay IC '12 Gallardo LP-570-4 Performante Ducati 748R |
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02-11-2022, 02:22 PM
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(see my signature) If you haven't already, go with the MS II daughtercard addon to the MS I at a minimum. I've done your exact route starting with the Bitz MS I ECU. Stock 8.6-1 compression on my ROW engine, Garrett turbo, Carrera manifold. 44lb injectors. <10psi netted me 360whp/321tq. I killed my 915 transmission, although I track the car I would drop the power to about 290 via a .2 bar WG spring and a manual boost controller.
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Kyle - 1980 RoW non-sunroof 911sc - 3.2 Turbo, Mahle P&C, Carrillo Rods, Megasquirt II (Fuel Only for now), re-geared 3rd and 4th 930 gearbox, 2350lbs Last edited by flat6pilot; 02-14-2022 at 07:59 AM.. |
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02-11-2022, 05:18 PM
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Join Date: Feb 2009
Location: Knoxville, TN
Posts: 1,347
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A big no on the Bitz ECU. Invest in at a minimum Microsquirt. It will do everything you would need it to do. IF you are using the intake off the 3.0SC engine, you can use the fuel rails and adapters in Tonys kit, that will save you some time, but you are also going to want to control timing, and that is something that the Bitz ECU kit just cannot do out of the box. I was running 10lbs on my conversion and i was running 60lb/hr Siemens/deka injectors, then upgraded to 80lb after converting to E85
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02-14-2022, 01:16 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,115
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Tony put together an amazing kit that was straight forward from my limited glances over his documentation, but as others have said, MS1 is ancient.
I'd definitely look at other systems especially beings you are boosting the engine |
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02-16-2022, 11:30 AM
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1976 Porsche 930
Greta
