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Corvette
C4 Forum
1988 Convertible for sunny day drives
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<blockquote data-quote="Tourmax" data-source="post: 248053" data-attributes="member: 5304"><p>For the large runner tpi, I'm basically modelling off what this gent built for his T/A over on thirdgen:</p><p></p><p><img src="https://www.thirdgen.org/forums/attachments/tpi/234680d1329622459-tpi-long-tube-runner-second-lt-runner-project" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://www.thirdgen.org/forums/attachments/tpi/234681d1329622459-tpi-long-tube-runner-second-lt-runner-project" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>Things to note:</p><p></p><p>1. runners are a full 2" OD, 1.8" ID</p><p>2. Runners shortened a couple inches (moves torque curve up rpm range slightly)</p><p>3. Upper plenum extensively reworked to add volume</p><p>4. Lower plenum reworked extensively:</p><p>a. runners ported out to match 1.8" cross section area</p><p>b. Injector bungs raised in order to make a gentler radius where it transitions into the head ports</p><p>c. many other "tweeks" to improve flow</p><p></p><p>He powder coated his, I plan to polish for as near as possible to stock appearance:</p><p></p><p><img src="https://www.thirdgen.org/forums/attachments/tpi/236632d1332012269-tpi-long-tube-runner-second-lt-runner-project" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://www.thirdgen.org/forums/attachments/tpi/357932d1501355485-tpi-long-tube-runner-secondltrunnerproject031.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>His setup reached 418 RWHP and 421 lb/ft RWTQ. </p><p></p><p>Granted, he did more work to it than just an intake though....</p></blockquote><p></p>
[QUOTE="Tourmax, post: 248053, member: 5304"] For the large runner tpi, I'm basically modelling off what this gent built for his T/A over on thirdgen: [IMG]https://www.thirdgen.org/forums/attachments/tpi/234680d1329622459-tpi-long-tube-runner-second-lt-runner-project[/IMG] [IMG]https://www.thirdgen.org/forums/attachments/tpi/234681d1329622459-tpi-long-tube-runner-second-lt-runner-project[/IMG] Things to note: 1. runners are a full 2" OD, 1.8" ID 2. Runners shortened a couple inches (moves torque curve up rpm range slightly) 3. Upper plenum extensively reworked to add volume 4. Lower plenum reworked extensively: a. runners ported out to match 1.8" cross section area b. Injector bungs raised in order to make a gentler radius where it transitions into the head ports c. many other "tweeks" to improve flow He powder coated his, I plan to polish for as near as possible to stock appearance: [IMG]https://www.thirdgen.org/forums/attachments/tpi/236632d1332012269-tpi-long-tube-runner-second-lt-runner-project[/IMG] [IMG]https://www.thirdgen.org/forums/attachments/tpi/357932d1501355485-tpi-long-tube-runner-secondltrunnerproject031.jpg[/IMG] His setup reached 418 RWHP and 421 lb/ft RWTQ. Granted, he did more work to it than just an intake though.... [/QUOTE]
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Corvette
C4 Forum
1988 Convertible for sunny day drives
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