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GTX ECU and compression ratio

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    #1

    GTX ECU and compression ratio

    Not really sure what sub forum this belongs in, but here goes.

    I am planning on a GTX swap in the next few months and was looking at rebuilding the engine. At first it was going to be a simple replace gaskets rebuild, but I've fallen down the slippery slope of; "since the engine will be apart I might as well....".

    I'm looking at forged pistons and rods. While I don't have an immediate desire for more power than the stock GTX levels I know I will in the future and figure prudent planning on the engine build will come in handy when I wish to turn the wick up.

    Most forged pistons offered for the BP are higher CR than the stock GTX CR, 8.2:1. My question is can the stock the GTX ecu handle an 8.5 or 8.6 CR? I want to avoid det. at all costs. If the GTX ECU can't handle the increased CR, how much power are GTX pistons good for?

    I do know Flyin miata can get custom CR pistons made.
    Last edited by Silentbob343; 01-07-2008, 08:47 PM.
    2005 Mazda 3
    Tags: None
    #2
    the gtx ecu will have no problem with a slight bump in compression. plenty of people boost N/A bp's and use the gtx ecu... the NA pistons are 8.8:1
    Last edited by therieldeal; 01-07-2008, 08:51 PM. Reason: z0mg 5000th post!
    Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
    ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
    Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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      #3
      Originally posted by therieldeal View Post
      the gtx ecu will have no problem with a slight bump in compression. plenty of people boost N/A bp's and use the gtx ecu... the NA pistons are 8.8:1
      A great point I had not thought of.
      2005 Mazda 3

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        #4
        Also GTX pistons will handle a bit more than the rods ... somewhere in the 300whp+ range.

        Comment

          #5
          Originally posted by Lex View Post
          Also GTX pistons will handle a bit more than the rods ... somewhere in the 300whp+ range.
          really? Would not have thought they would support that much power.
          2005 Mazda 3

          Comment

            #6
            Originally posted by Silentbob343 View Post
            really? Would not have thought they would support that much power.
            Even the rods can take it for a while.

            Comment

              #7
              IIRC the N/A sohc pistons are 8:2.1 so if you were really worried about comp then there you go
              1993 Protege LX-Midnight's shadow SOLD
              1996 Honda CBR600-Wrecked. Damn Honda crippled me
              2002 mazda MPV-family truckster SOLD
              2010 VW routon

              Originally posted by jay
              .....they totally underestimated the number of gearheads such as myself that have families but refuse to grow the hell up and stop playing with cars, or that otherwise see the utility of having 4 doors. Obviously I ain't alone, as there are a helluva lotta sti and evo here. Bueler? Beuler? Mazda? Mazda?

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                #8
                Originally posted by Turpro View Post
                IIRC the N/A sohc pistons are 8:2.1 so if you were really worried about comp then there you go
                heh I don't think I've ever seen forged SOHC pistons. Have not decided on whether or not I'll do forged pistons, still plenty of time to decide.
                Last edited by Silentbob343; 01-08-2008, 07:45 PM.
                2005 Mazda 3

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                  #9
                  i am running stock bp with gtx ecu not to sure what ecu but redlines at 7000+

                  Comment

                    #10
                    Originally posted by smoke187 View Post
                    i am running stock bp with gtx ecu not to sure what ecu but redlines at 7000+
                    I dont think any do.
                    I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

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                    Oh and by the way that shot in your banner with Vin Diesel's car getting shot, thats a civic not an altezza.

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                      #11
                      i will advice to get the knock box from the gtx harness and run it . that will most deff help with det!
                      or you can get some thing from msd knock control box to help to.
                      GOD INVENTED TURBO LAG TO GIVE THE V8 A CHANCE!!!!!
                      AND
                      THE DEVIL INVENTED THE ''ANTILAG'' TO SHOW THEM NO MERSEY!!!!

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                        #12
                        Originally posted by wheresthericego View Post
                        I dont think any do.
                        most do but the stickers tend to rub off and someone had wrote bp26 or bp58 on the front of it so its one or the other

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                          #13
                          if the revlimiter is above 7000 you have the BP26, the BP58 and BP55 revlimit at 6500.
                          Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
                          ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
                          Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

                          Comment

                            #14
                            didnt know the bp58 rev was that low

                            Comment

                              #15
                              its more like 6700
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                              1992- project FE3..... 313 WHP @ 9.3psi



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