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#1
08-13-2021, 06:30 PM
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Throttle body size on M103 3.0?
I went to the junkyard today and pulled a spare intake manifold off of a 2.6 103 - which I think is the same as the one on the 3.0. As I tear in to this manifold and build it back up with the intent of it driving EFI conversion first, then ignition, then eventually turbo, is there any advantage to a particular size of throttle body?
I’ve noticed that the 103 doesn’t necessarily seem to have much in the way of nuts at the upper end of the rev range, unlike my 3.2 Carrera, which loves being in the 5-6k range. Obviously different type of car and engine, but just wondering if this is a breathing issue where I might see some minor gains with more air (before turbo).
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--- 1986 Porsche 3.2 Carrera - 1987 W124 300E - 1999 Land Cruiser 100 - 2015 MKVII GTI - SLK32 AMG (sold) - 1998 3rd Gen 4Runner Limited (sold) 
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#2
09-09-2021, 08:20 PM
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IIRC stock is 64mm. I did a 70mm on a 103 and there was a slight high RPM bump, but nothing life changing.
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 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#4
09-11-2021, 01:08 AM
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The 300CE-24 has a 70mm but I made mine by boring a sleeveing the 64mm unit.
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90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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