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boost with 10.5:1 compression?

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  • #31
    Hey every mom that can cook cookies are worth a damn in my book...


    mmmmcookies....
    Lifting my front wheels, one jack at a time.

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    • #32
      BillS: iron heads won't take as much boost as aluminium before knocking. And I'm not so sure a fuel cut on your motor when it starts to knock is a good idea under boost. That's a good way to start knocking more and melt pistons!
      sigpic New 2010 project (click image)
      1994 3100 BERETTA. 200,000+ miles
      16.0 1/4 mile when stock. Now ???
      Original L82 Longblock
      with LA1, LX9, LX5 parts
      Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

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      • #33
        lean is mean, rich is safe.
        sigpicHow to make High performance Emissions:
        A "true" High flow converter, straight pipe.
        Low/No flow EGR valve, block off plate.
        Carbon canister and purge valve mod, place in large 30 Gallon can, cover, and place curbside, the city will do the rest.
        PCV valve and vent tube, reroute to exhaust to dump where it belongs, on the ground. Or add breathers and let it all free.

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        • #34
          Just add a little Toluene to every tank

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          • #35
            xylene works good too i guess. a guy at work used to race and make his own gas. increases octane AND it burns hotter
            sigpic
            88 Beretta CL- 13.641@102.76mph (rwd LS1/t56 conversion in progress)

            77 Celica GT- 3400/3500 swap in progress (engine from the beretta)

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            • #36
              Originally posted by 1988GTU View Post
              Lowering the CR for boost is old school thinking and is a thing of the past.
              That all depends on the amount of boost you want to run. If he is at 10.5:1 compression, then I wouldn't recommend any thing over 5 lbs of boost on a street vehicle.
              Last edited by sprucegagt; 06-14-2009, 10:27 PM.
              Your local OBDII moderator

              2000 Grand Am GT w/ WOT parts

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              • #37
                we can throw in engine coatings too.
                Andy

                sigpic

                fastest 1/8: 10.19@ 67.17
                fastest 1/4: 16.16@ 82.70

                62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

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                • #38
                  Originally posted by IsaacHayes View Post
                  BillS: iron heads won't take as much boost as aluminium before knocking. And I'm not so sure a fuel cut on your motor when it starts to knock is a good idea under boost. That's a good way to start knocking more and melt pistons!
                  When the injectors shut down, you don't get a lean run condition (which would trash pistons) you get a no run condition - the fire goes out and doesn't come on again until you lift off. Wondered what the heck had happened first time I hit that, believe me! Miller Woods used that system and it seems to work just fine - not that you are bouncing of the limit all the time.

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                  • #39
                    Originally posted by sprucegagt View Post
                    That all depends on the amount of boost you want to run. If he is at 10.5:1 compression, then I wouldn't recommend any thing over 5 lbs of boost on a street vehicle.
                    I'm willing to risk as high PSI as I can get as long as the tune is within a safe territory. There really is no magic number seeing how every engine takes on detonation differently.
                    Lifting my front wheels, one jack at a time.

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                    • #40
                      new issue.. my engine bay is smaller than i thought.. i dont even think its possable to mount one where the AC goes.. took a few measurements to compare to different chargers
                      sigpic
                      88 Beretta CL- 13.641@102.76mph (rwd LS1/t56 conversion in progress)

                      77 Celica GT- 3400/3500 swap in progress (engine from the beretta)

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                      • #41
                        Talk to mars_man and see if he can get you some pics of his setup.
                        sigpic New 2010 project (click image)
                        1994 3100 BERETTA. 200,000+ miles
                        16.0 1/4 mile when stock. Now ???
                        Original L82 Longblock
                        with LA1, LX9, LX5 parts
                        Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

                        Comment

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