Re-Installing My Supercharger

Discussion in 'F/I Mods & Tuning' started by iniazy, Aug 18, 2014.

  1. Torspd

    Torspd Moderator
    Staff Member

    Joined:
    May 25, 2008
    Messages:
    14,741
    Likes Received:
    28
    Put a smaller pulley on.

    Was that other boost achieved on the stock engine?
     
  2. iniazy

    iniazy Active Member

    Joined:
    Jan 29, 2014
    Messages:
    486
    Likes Received:
    28
    Yes on stock engine.

    Smaller pulley will over spin the rotor beyond factory specs, and I had the same size pulley previously.

    Just might be inlet restrictions. But I'm really happy with the power, feels so good even though it's max boost is not what I hoped for.

    I'll just live with it. Tired of worrying about it.
     
    Torspd likes this.
  3. NHXRUNNER

    NHXRUNNER "New Hampster"
    Staff Member

    Joined:
    Jul 30, 2007
    Messages:
    7,149
    Likes Received:
    51
    Your last explanation sounds right. Move volume = more power. PSI doesn't really mean much. Lots of variables that can change boost.
     
    Torspd likes this.
  4. iniazy

    iniazy Active Member

    Joined:
    Jan 29, 2014
    Messages:
    486
    Likes Received:
    28
    I want to buy the intake system with filter compartment that comes with the URD mk3 kit. Anyone willing to sell his? I know some people, @shane881510 , who have replaced it with an open pod filter.

    Anyone wanting to sell his lemme know.
     
  5. FinnJ

    FinnJ New Member

    Joined:
    Mar 11, 2017
    Messages:
    3
    Likes Received:
    1
    Still quite small filter, and that snorkel(?) hose might cause a lot of restriction for air flowing too.
     
    Torspd likes this.
  6. iniazy

    iniazy Active Member

    Joined:
    Jan 29, 2014
    Messages:
    486
    Likes Received:
    28
    I agree, I'm looking to find a way to fit a larger filter. However, it is much larger than the old one, and I was able to make 10.7 PSI from the old one, with the same flexible duct and a smaller supercharger. So can't be the reason.
     
  7. Torspd

    Torspd Moderator
    Staff Member

    Joined:
    May 25, 2008
    Messages:
    14,741
    Likes Received:
    28
    Have you tried running with just a large cone filter, for testing purposes? To see if any differences were had? Or briefly with no filter?
     
  8. iniazy

    iniazy Active Member

    Joined:
    Jan 29, 2014
    Messages:
    486
    Likes Received:
    28
    No I didn't. Not good for the engine, air will be too hot even before compression, will result in bad knock at WOT. I don't want to take the risk. It will be sucking in hot air leaving the radiator, further heated by the headers.

    I tried it without the supercharger and was knocking bad, imagine how it would do with a supercharger.
     
  9. Torspd

    Torspd Moderator
    Staff Member

    Joined:
    May 25, 2008
    Messages:
    14,741
    Likes Received:
    28
    Then maybe you should talk to whoever you're buying those intakes from, to make a larger one.
     
  10. iniazy

    iniazy Active Member

    Joined:
    Jan 29, 2014
    Messages:
    486
    Likes Received:
    28
    I'm trying to get my hands on a URD intake. That would be awesome.
     
  11. iniazy

    iniazy Active Member

    Joined:
    Jan 29, 2014
    Messages:
    486
    Likes Received:
    28
    A few new updates, no pictures, so get ready for a write-up.

    1. I have learned something new. If I suppress low RPM knock by retarding the timing at low RPM, the engine will take a leap in performance while suburban driving. I retarded the timing down to -3 degrees at low RPM, at bout 0 PSI, and now driving the truck feels so good even at hot weather while the A/C is on, almost as good as it felt when the weather was still cold. I remembered an article I read in Gadget's blog about this subject, when he was tuning the TRD supercharged Tacoma 3.4 Liter V6. But the reason I didn't think I needed it is that the article said it is most important in Manual transmissions. Well I now know it is also necessary for Automatics, for best driving performance. Was a great learning experience.

    2. I put the truck on the Dyno. The figure produced is nothing to be proud of, so I'm going to ommit putting a number. The reason is I street-tuned my truck, did not dyno-tune it. Although the truck feels really good driving it, I really rarely go WOT, which is why I did not notice a lack of top-end power. The tuner said I'm running way too rich, going below 10.5:1 from 3000 RPM up to 5500. He said I need to lean it out to improve the output. The reason why I had it so rich is to suppress knock. So I decided to lean it out, and then retard the timing if there is knock. I read several opinions on forums that the rule of thumb in timing is you drop 0.8 degrees for each PSI of boost. Since I am reaching 10.3 PSI, I decided to retard the timing 8 degrees at WOT, gradually. I started leaning it, and now I am at 11:1 AFR at WOT, and very little knock. I still hear some knock if I do several consecutive runs, which is probably due to heat soak from the water-air intercooler. But nothing serious. Now it does feel a lot stronger at WOT. I'm wondering if 11:1 is still too rich, as I see many people going up to 11.8:1 and 12:1, but I am keeping it at 11:1 because I know my truck's factory tune goes down to 11:1 at WOT even when with standard equipment. I tested it before installing the supercharger and injectors. So I won't want to be leaner than factory. Even when observing the AFR in my Mazda Miata, at around 7000 RPM the AFR does go down to 11:1, on factory tune without a Supercharger. So I believe this should be a safe AFR.

    I still doubt I'm hitting 300 HP with the current power, I don't know how you guys are managing 400+ HP with the smaller supercharger and smaller crank pulley. Even with the current setup I'm only making 10 PSI at sea level. Is it the Dyno in question? Maybe.

    3. I now work at another town that is 600 meters above sea level, while I live on a coastal town at sea level. I found that at my work town, I lose 1 PSI of boost. Here I only manage 8.5 PSI, while at home I manage 9.5-10 PSI. That's an interesting observation that explains why I always feel a little weaker at work.

    I hope I didn't bore you guys to death without pictures :)
     
    Redlantern likes this.

Share This Page

  • About Us

    XR-Underground is a dedicated community of Toyota X-Runner enthusiasts that was launched in January 2007. X-Runner Underground.com, referred to as XRU by our regular members, offers an active discussion forum, group events, specialty merchandise, a welcoming community of owners and the most information you can find about the Toyota X-Runner on the internet!
  • Quick Navigation

    Open the Quick Navigation

  • Like us on Facebook

  • Your donations keep XRU going

    XRU is a forum for the users, by the users. We receive very limited funding from vendors so we really rely on donations to cover our operating costs and to provide products and giveaways at events. Every dollar helps!

    If you are able to donate, we'd really appreciate your help.