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Thread: 72 RS Prototype Hot Rod Build!

  1. 08-13-2023, 03:35 PM #171
    Longballa
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    Quote Originally Posted by Arne View Post
    That's come a long way from the yellow pinstriped car I used to know...
    Sure has Arne! When I get the engine in let's do a drive to the coast.
    72S, 72 3.5L Signal Green, 914-6 GT Signal Green
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  2. 08-14-2023, 01:48 AM #172
    TRS63
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    Looking fantastic, car& engine..I am sure you can't wait to get it on the road !

    Antoine
    My lightweight 914 project: http://https://www.early911sregistry...weight-project
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  3. 08-17-2023, 08:32 PM #173
    Longballa
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    Quote Originally Posted by TRS63 View Post
    Looking fantastic, car& engine..I am sure you can't wait to get it on the road !

    Antoine
    Yes, that's an understatement! Dying to get it on the road!
    72S, 72 3.5L Signal Green, 914-6 GT Signal Green
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  4. 08-17-2023, 08:37 PM #174
    Longballa
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    So, yesterday was engine break in day on the dyno and today was mapping the A/F ratio and trying 5 different mufflers! it's kind of unbelievable the difference just a muffler can make. I'll do a detailed comparison after Monday for you guys but here's some pics from today.
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    72S, 72 3.5L Signal Green, 914-6 GT Signal Green
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  5. 08-17-2023, 09:41 PM #175
    skinnerd
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    Looks killer as always Scott.
    You might need to install some "airbags" with that motor though.....

    -Doug
    2022 Carrera 4S Oslo Blue
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  6. 08-18-2023, 01:17 PM #176
    Longballa
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    Quote Originally Posted by skinnerd View Post
    Looks killer as always Scott.
    You might need to install some "airbags" with that motor though.....

    We're at 340 plus HP probably end up around 345 so yeah it's going to be speedy! Just how I like it.
    72S, 72 3.5L Signal Green, 914-6 GT Signal Green
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  7. 08-20-2023, 12:14 PM #177
    Longballa
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    The Dyno has spoken! 347.4 HP and 267.4 torque!! Gonna rip!
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    72S, 72 3.5L Signal Green, 914-6 GT Signal Green
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  8. 08-20-2023, 02:02 PM #178
    Bert
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    Fantastic power numbers!

    It will be hard to control your right foot.
    Bert Jayasekera
    1970 911T - Tangerine Orange
    Early 911S Registry #494
    R Gruppe #167
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  9. 08-20-2023, 02:03 PM #179
    Bert
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    Quote Originally Posted by Longballa View Post
    The Dyno has spoken! 347.4 HP and 267.4 torque!! Gonna rip!
    I'm curious if the factory air box affected your power rating. Did you swap it out when you tried different mufflers?
    Bert Jayasekera
    1970 911T - Tangerine Orange
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  10. 08-20-2023, 02:17 PM #180
    Longballa
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    No, didn't try a different air box because this is what I'm going to run. Foam filters would be too tall the fit under the engine lid so this SCRS style air box is what will fit. I also dig the look of it. All the gains from the first pull were achieved by changing to a dual out muffler. I was going to run the Dansk single out sport muffler but it sucked on flow. We next tried the Scart single tip muffler and it was a 10-12 HP increase. Then we tried a dual out sport muffler and had a big jump to 20HP increase. Then we used a dual out R style muffler and got the final result of a 30HP gain. So, I'll be using the dual out R style muffler instead. My heads have been ported so they flow a lot of air so needed the muffler to do the same. I could get even more gains probably if I went to 1 3/4 headers but I'm going to use the new larger SSI's. I like the look and function of them and am very happy with the HP and Torque.
    72S, 72 3.5L Signal Green, 914-6 GT Signal Green
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