 Airflow/Horsepower limit for stock 2.0L intake system? |
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| Beebo Kanelle |
 Dec 11 2020, 06:19 PM
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#41
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Member  Group: Members Posts: 248 Joined: 22-November 12 From: Houston, Texas Member No.: 15,177 Region Association: Southwest Region 
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I think you will find that the intake runners are designed for low-end torque. The runners must be shorter in order for resonance to enhance power output at higher rpm.
A solution is to install an interim plenum between two runners, effectively shortening the runner and raising the resonance frequency, allowing for better breathing a higher rpm. The downside is that you will lose torque on the bottom end. Hope that helps. |
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| greggearhead |
Dec 11 2020, 07:57 PM
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#42
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Newbie Group: Members Posts: 35 Joined: 19-March 11 From: Colorado Springs, CO Member No.: 12,836 Region Association: None |
QUOTE(914werke @ Dec 11 2020, 04:40 PM)  Was this car in WA? I recall a car that stopped in I swear was identical. Yes, it was!! He built it and drove it for a a few years. Went to Canada, etc. Put some miles on it. Super well built and developed, especially for a VW 412 - custom bushings, 944 brakes, built transmission, on and on. Cool car. Now just needs some cleaning and updating. |
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| Dave_Darling |
Dec 13 2020, 12:56 AM
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#43
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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The general consensus seems to be that the exhaust will limit you before the intake does. Switching over to a good tuned exhaust (like the Tangerine Racing one) will give you a very significant bump in power.
--DD |
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| GregAmy |
Dec 13 2020, 10:14 AM
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#44
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Advanced Member Group: Members Posts: 2,284 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(Dave_Darling @ Dec 13 2020, 01:56 AM) The general consensus seems to be that the exhaust will limit you before the intake does. Switching over to a good tuned exhaust (like the Tangerine Racing one) will give you a very significant bump in power. I'll be dyno-testing that in the Spring with the new engine. First tune it with the stock heat exchangers (Microsquirt w/ stock DJet TB, plenum, and runners) then swap to a Tangerine header and re-tune/dyno. |
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| greggearhead |
Dec 17 2020, 12:55 PM
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#45
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Newbie Group: Members Posts: 35 Joined: 19-March 11 From: Colorado Springs, CO Member No.: 12,836 Region Association: None |
I wonder how the 412 heater boxes compare to the 914 ones. They are definitely shorter...
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