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    #1

    Melted pistons

    Ok here is the recepy, i built the engine, thinking i was going to go through the n/a way, so i have on my block a 9.5 comp ratio pistons, and bore of 0.50
    My block y absolutly N/A, and using the GTX ECU, with the gtx inyectors, but a fuel pressure regulator barnd SX, at 50 psi, and at WOT it is for 60. but it reads boost so the fuel vs boost ratio on the regulator is 1:1, well i did the wide band and it was on 15, yes 15....and it lasted for 4 months, until i was running on hi-fourth gear and even fith, we it melted using 91 octane pump gas. Timming 16 degrees.
    Attached Files
    94 lx, custom manifold Mitsubishi 16g (EVO III) turbo, XTD stage 3 clutch kit, strut bar, and 3 inches exhaust free flow. Natural aspired Head and Block, RX7 N/A 440 cc injectors, GTX intake manifold, MS2 V3 (stratifiedauto) , SX Fuel pressure regulator, Front mount intercooler, TD05 16g turbo
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    #2
    so i learned the lesson and as soon as i change miy pressure plate, i will instal the SAFC and the 440 rx7 inyectors.
    94 lx, custom manifold Mitsubishi 16g (EVO III) turbo, XTD stage 3 clutch kit, strut bar, and 3 inches exhaust free flow. Natural aspired Head and Block, RX7 N/A 440 cc injectors, GTX intake manifold, MS2 V3 (stratifiedauto) , SX Fuel pressure regulator, Front mount intercooler, TD05 16g turbo

    Comment

      #3
      nice job turn that timing down

      Comment

        #4
        very ouch! you did a nasty number to that piston. what pistons were they?
        ---Has ClubProtege helped you in someway? show your support by Contributing--- Click Here---

        1992- project FE3..... 313 WHP @ 9.3psi



        I pet my dash when I get into the car..."good car"
        he actually has a mazda tree, parts grow on it

        Comment

          #5
          15 AFR under boost is not acceptable as you know. The heat generated and possible detonation will destroy an engine.

          Comment

            #6
            Originally posted by bpt323 View Post
            very ouch! you did a nasty number to that piston. what pistons were they?
            I'd say miata ones since the were 9.5:1


            Yeah 15 is way too lean for boosting safely.

            Nice pics though.
            The T3 BP MX-3 conversion has begun, and is taking forever & will kill me.

            Comment

              #7
              If you go to the local store, they do not sell the 9.0 they sell the 9.5 , i have 9.5 over size .50, i had them for $38.95, and the piston rings for 42.50, still using those pistons to the date, but with a peak of 14psi then goes to 13psi on 4th gear.
              94 lx, custom manifold Mitsubishi 16g (EVO III) turbo, XTD stage 3 clutch kit, strut bar, and 3 inches exhaust free flow. Natural aspired Head and Block, RX7 N/A 440 cc injectors, GTX intake manifold, MS2 V3 (stratifiedauto) , SX Fuel pressure regulator, Front mount intercooler, TD05 16g turbo

              Comment

                #8
                how are the rings they sell with those pistons? & the quality of the pistons?
                ---Has ClubProtege helped you in someway? show your support by Contributing--- Click Here---

                1992- project FE3..... 313 WHP @ 9.3psi



                I pet my dash when I get into the car..."good car"
                he actually has a mazda tree, parts grow on it

                Comment

                  #9
                  About the sealing on the rings, i have been boosting at least 10 psi on a 9.5 config @ .50 and the static compresion is on 170 psi on each cilinder, these are japanese pistons, soon i will do some ceramic coating on a set of new ones.
                  94 lx, custom manifold Mitsubishi 16g (EVO III) turbo, XTD stage 3 clutch kit, strut bar, and 3 inches exhaust free flow. Natural aspired Head and Block, RX7 N/A 440 cc injectors, GTX intake manifold, MS2 V3 (stratifiedauto) , SX Fuel pressure regulator, Front mount intercooler, TD05 16g turbo

                  Comment

                    #10
                    i like the sound of that
                    ---Has ClubProtege helped you in someway? show your support by Contributing--- Click Here---

                    1992- project FE3..... 313 WHP @ 9.3psi



                    I pet my dash when I get into the car..."good car"
                    he actually has a mazda tree, parts grow on it

                    Comment

                      #11
                      ouch this is a shame, im planning on doing the 9:5:1 custom wisco's since the head is done now the bottom end needs some good help!
                      My baby 93' Protege Lx--R.I.P
                      New Baby 94' Protege Lx Black
                      91' Miata - SOLD
                      93' Protege LX new Project (no rust)!
                      Mods: Protege:
                      Engine: Fully built with wiseco 9:1 +1mm ceramic coated tops and molly skirts, M-tuned H beams, ACL Race rod and thrust bearings with King Mains, Arp Mains ,rod and head studs,3 lbs lightend crank, Everything is ballanced, spec stage 3 clutch,lightend flywheel, RX7 Afm, Fidanza Adj. cam gears, timing,Cut intake manifold from BPT323, exintake cam swap,full port and polished head 1mm stainless oversize valves, vf12/vj20Turbo, 3" custom full exhaust w/external wastegate,3" E-Cut, Eclipse crushed BOV , Fmic, Aem Urgo wideband, Autometer boost gauge, Magnaflo Muffler,batt relocated to trunk, slight wire tuck with engine bay fuse box under dash Bp26 ecu
                      Suspension: Energy Suspension rear trailing arms,Es Front Sway bar endlinks,Zx2 Front Sway Bar,El Sport w/bilstein mono tube struts and don't know what springs, Suspension Tequniques Rear Sway bar with Es endlinks,mx3 rear lower tie bar. corksport SS brakelines and clutch line.
                      Exterior: Adler Racing 16"s ,Mx6 Front lip,EGT Glass Sunroof,Edm Headlight & corners EGT side skirts,Gt Led wing, Led interior 3rd brake light
                      Audio: few things polk momo 6.5 components, VW Monsoon Front Componants with monsoon amp,alpine head unit
                      sigpic

                      Comment

                        #12
                        yeah that 15:1 afr killed you. i run 10.2:1 comp ratio, 11.5afr on my lsvtec and 9psi, my timing is in the 20s.

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