• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.

Announcement

Collapse
1 of 2 < >

Looking for Genuine Volvo Penta parts? Visit the volvopentastore.com - powered by iboats.com to receive FREE SHIPPING on orders over $99!

Looking for Genuine Volvo Penta parts? Visit volvopentastore.com - powered by iboats.com to receive FREE SHIPPING on orders over $99! UPS Ground only. Not available on Alaska, Hawaii, or international orders.
2 of 2 < >

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Difference between Volvo Gi and GXi ??

Collapse
This topic is closed.
X
X
  • Filter
  • Time
  • Show
Clear All
new posts


  • Difference between Volvo Gi and GXi ??

    I searched all over this forum and the web and just CANNOT get any definate answers, so Im hoping you can help.

    I need to know the difference between the Volvo Penta 5.0 Gi and the Volvo Penta 5.0 GXi.

    I understand that to some extent, they are both "fuel injected". I have read varying things as far as similarities and differences and I just cant come to a conclusion on what is right and wrong. Please help! Were trying to make sure we buy the right engine.
    We have already ruled out any carbs as its just not what we want. But I need a comparison between these Gi and GXi models.

    thanks all!
    -CUBE-
    2004 Caravelle 207
    5.0L Merc MPI - Alpha I
    Ballistic 17p 3Blade SS


  • #2
    Re: Difference between Volvo Gi and GXi ??

    The X stands for Xstra special.
    There is no replacement for displacement

    2006 Chaparral 204SSi
    VP 5.0L GXi-F with SX Drive

    Comment



    • #3
      Re: Difference between Volvo Gi and GXi ??

      yep gxi is extra special You get an extra 40 hp!
      why don't ask me..
      Googled it for ya.
      http://www.volvo.com/NR/rdonlyres/F9...0/57_DP_04.pdf
      1974 23' Bayliner Nisqually:
      1997 Volvo Penta 5.7 FI
      Duoprop, SS F4 Props

      Comment



      • #4
        Re: Difference between Volvo Gi and GXi ??

        I was aware of the difference in HP, and I also know that the Gi is TBI (throttle body injected) and the GXi is MPI (multipoint injected), but being that I dont understand what these mean, Im more worried about the surrounding details.

        Anyone know of any differences/similarities between:

        -Starting (choke, turning over, etc)?
        -Services needed for elevational changes?
        -Parts that you need to service periodically (carb parts, injectors, etc)?
        -Reliability?
        -Torque specifications?

        PLEASE!!!
        -CUBE-
        2004 Caravelle 207
        5.0L Merc MPI - Alpha I
        Ballistic 17p 3Blade SS

        Comment



        • #5
          Re: Difference between Volvo Gi and GXi ??

          ............


          Knuckle head response was smitten..
          Stickly a opinion your milage may vary.

          Speed is how fast you hit the wall
          Torque is how far you move the wall"

          Comment



          • #6
            Re: Difference between Volvo Gi and GXi ??

            take this with a grain of salt, as im no expert... tbi has 1 central fuel injection point, like a carb, then the fuel disperses through the intake to diffrent cyls. mpi has an injector for each cyl, fueling can be more precisely metered, the engine can run more efficiently, smoother cold start, better idle, higher hp. i have no idea how well volvos software takes advantage of the superior design of mpi, but the system is potentially better. on the down side, there are more injectors that may someday need to be cleaned, but that wouldnt stop me from choosing mpi.

            Comment



            • #7
              Re: Difference between Volvo Gi and GXi ??

              Lucky is almost exactly right. TBI (Rochester's name) is "almost" like a fancy carb. It has 2 electronically controlled injectors that spray a constant stream of fuel down on top of the throttle plate that open up, just like a regular carburetor. They are less precise and are not "timed" like MPI can be. But they offer all the real benefits of fuel injection (cause it is fuel injection)... turn key starts, better throttle response, improved fuel economy, in relation to a carb.
              I really didn't think the current Volvo engines use TBI anymore. Are you sure about the Gi being TBI? Have you physically seen it?

              I have always heard, but have never seen, that on a 5.7GXi, they use roller rockers with a 1.6 ratio. Also the exhaust manifolds on a 5.7GXi are supposedly different, but I can't see it. Maybe these apply to the 5.0 as well?

              Regardless, the general concensus is that on the 5.7GXi the extra HP comes at the very upper rpm range and the low end performance is no better than the Gi engines. I could see the same being tru of the 5.0 as well.

              Comment



              • #8
                Re: Difference between Volvo Gi and GXi ??

                Without knowing the years, full model numbers etc of the Gi and/or GXi, it's hard to say what is different.

                Could be nothing more than an ECM change in programming.

                PS: The X stands for exceptiional, not extra special.
                Don S.

                sigpic

                Please, no PM's (Private Messages) regarding boat/engine problems.
                That is what the forums are for.
                Only forum/moderator issues will be answered in PM's.

                Comment



                • #9
                  Re: Difference between Volvo Gi and GXi ??

                  Originally posted by Don S View Post
                  Without knowing the years, full model numbers etc of the Gi and/or GXi, it's hard to say what is different.

                  Could be nothing more than an ECM change in programming.

                  PS: The X stands for exceptiional, not extra special.
                  if the x is for exceptional then what is the s in gsi for?
                  Thats like wiping your butt before you go. You can do it, but it just don't make any sense.

                  Comment



                  • #10
                    Re: Difference between Volvo Gi and GXi ??

                    S stands for superior

                    http://dc93.4shared.com/download/485...gas_engine.pdf
                    Don S.

                    sigpic

                    Please, no PM's (Private Messages) regarding boat/engine problems.
                    That is what the forums are for.
                    Only forum/moderator issues will be answered in PM's.

                    Comment



                    • #11
                      Re: Difference between Volvo Gi and GXi ??

                      Originally posted by Don S View Post
                      That is even funnier than if you were joking.
                      I guess I will go change the oil in my superior engines now.
                      Thats like wiping your butt before you go. You can do it, but it just don't make any sense.

                      Comment



                      • #12
                        Re: Difference between Volvo Gi and GXi ??

                        I was just doing some number checking. The only thing I can find different on the Gi engines and the GXi engines is the ECU.
                        Rocker arms are all 1.5:1, fuel pumps and injectors the same, throttle body and sensors the same, exhaust manifolds and risers are the same.
                        Don S.

                        sigpic

                        Please, no PM's (Private Messages) regarding boat/engine problems.
                        That is what the forums are for.
                        Only forum/moderator issues will be answered in PM's.

                        Comment



                        • #13
                          Re: Difference between Volvo Gi and GXi ??

                          Originally posted by TilliamWe View Post
                          Lucky is almost exactly right. TBI (Rochester's name) is "almost" like a fancy carb. It has 2 electronically controlled injectors that spray a constant stream of fuel down on top of the throttle plate that open up, just like a regular carburetor. They are less precise and are not "timed" like MPI can be. But they offer all the real benefits of fuel injection (cause it is fuel injection)... turn key starts, better throttle response, improved fuel economy, in relation to a carb.
                          I really didn't think the current Volvo engines use TBI anymore. Are you sure about the Gi being TBI? Have you physically seen it?

                          I have always heard, but have never seen, that on a 5.7GXi, they use roller rockers with a 1.6 ratio. Also the exhaust manifolds on a 5.7GXi are supposedly different, but I can't see it. Maybe these apply to the 5.0 as well?

                          Regardless, the general concensus is that on the 5.7GXi the extra HP comes at the very upper rpm range and the low end performance is no better than the Gi engines. I could see the same being tru of the 5.0 as well.
                          Me bad...GI does not mean TBI....Seems like i have TBI burnout going on with tying to get my 4.3 done cost effectivley..
                          Stickly a opinion your milage may vary.

                          Speed is how fast you hit the wall
                          Torque is how far you move the wall"

                          Comment



                          • #14
                            Re: Difference between Volvo Gi and GXi ??

                            The two engines I actually was comparing were both from 2001. Seems like Im getting some good info here.
                            I know that with standard carbed engines you need to get certain parts changed in order to use your boat at higher/lower elevations. Is this true for TBI and MPI engines as well? Or will the ECU recognize different air mixtures and adjust...this is one of our primary concerns as well be taking our boat to Tahoe and Powell, as well as regular sea level lakes around our area. We want to make sure we get the right engine.


                            -CUBE-
                            2004 Caravelle 207
                            5.0L Merc MPI - Alpha I
                            Ballistic 17p 3Blade SS

                            Comment



                            • #15
                              Sign up today
                              Re: Difference between Volvo Gi and GXi ??

                              The ECU will make some adjustments. But since it is not a closed loop fuel injection system, it won't be perfect. But there aren't any "parts" you can change to help it. Just propellers. Cause the motor (either one) will be less powerful at elevation than near sea level.
                              As far as MPI v TBI, you are just going to have to lok at the engines to see which has which. The difference will be Obvious.

                              DonS, thanks for the parts look up, and showing that the manifolds and such are the same.

                              Comment


                              Working...
                              X