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    • HPF Stage 2.75 turbo E46 M3 hits 754 wheel horsepower

      Horsepower Freaks Stage 2.75 is a recent development. The stage 2.5 as many of you know is a built motor and has seen numbers on methanol and race gas just under the 700 whp mark. Stage 2.75 differs from the 2.5 by offering a different turbo as well as the HPF 4" exhaust that is used on the Stage 3 as well. 754 whp is impressive and we congratulate HPF on a job well done. More power clearly isn't necessary so how about that 10 second slip already?

      STAGE 2.75



      STAGE 2.5 vs STAGE 2.75 on PUMP



      STAGE 2.5 vs STAGE 2.75 on RACE (110 OCTANE)



      STAGE 2.5 vs STAGE 2.75 on PUMP and METHANOL



      STAGE 2.5 vs STAGE 2.75 on RACE and METHANOL









      This article was originally published in forum thread: HPF Stage 2.75 turbo E46 M3 hits 754 wheel horsepower started by Sticky View original post
      Comments 84 Comments
      1. ccsykes's Avatar
        ccsykes -
        Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
        When you get the car back we want to see it done. Click here to enlarge
        Big problem I see is going to be the drivetrain. The first problem is the wheel/tire combo's available. Simply put there just isn't any great solutions available. The other issue is the rear differential housing. When you really look at how it is mated up to the chassis, it just doesn't seem like it's going to be able to handle a hard hole shot. These cars have had problems with frame rail cracking under normal driving conditions, now add in 700+ HP hard launches. The only way to really put the power down is going to be slicks and that opens up a whole new can of worms as far as stress on the driveline.

        The other weak point is the transmission and r&p gearing. It just doesn't seem geared properly for drag racing. If you watch EviltwinRob's 1/4 mile videos you will see that the car is at the extreme top of 4th when hitting the traps. The 137 MPH trap speeds are normally associated with cars running in the mid 10's.

        I honestly believe the only way an E46 M3 is going to run 1/4 mile time that more closely matches a 700+ HP car is through the use of a SA and 3 speed auto like a TH400.

        Now where I think a HPF M3 can really shine though is going to be in mile racing like at the Texas mile. I believe the gearing is probably perfect for that. I mean hell, your already at 137 MPH in 1/4 mile.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ccsykes Click here to enlarge
        Big problem I see is going to be the drivetrain. The first problem is the wheel/tire combo's available. Simply put there just isn't any great solutions available. The other issue is the rear differential housing. When you really look at how it is mated up to the chassis, it just doesn't seem like it's going to be able to handle a hard hole shot. These cars have had problems with frame rail cracking under normal driving conditions, now add in 700+ HP hard launches. The only way to really put the power down is going to be slicks and that opens up a whole new can of worms as far as stress on the driveline.
        Exactly, the rear end needs to be addressed somehow but that may make the car one dimensional which is not what E46 M3 owners want. This is why 60-130's and traps tend to tell the story and roll on's/top end is the area of strength.
      1. daytonaM3's Avatar
        daytonaM3 -
        If you want to run a 9sec you will need more torque,why are most people only looking at whp because on the drag strip torque is a lot more important.

        I also do not understand why the HPF Kits/S54 turbo engines has less torque as a turbo S50B30/32.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by daytonaM3 Click here to enlarge
        If you want to run a 9sec you will need more torque,why are most people only looking at whp because on the drag strip torque is a lot more important.
        It depends, plus hp and torque are a function of one another.
      1. HPF Chris's Avatar
        HPF Chris -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        It depends, plus hp and torque are a function of one another.
        Thanks guys.

        The first customer to set up their rear end for drag racing will easily be in the 10's and there is enough power there to get into the 9's for sure. Click here to enlarge

        Chris.
      1. gringotegra's Avatar
        gringotegra -
        Click here to enlarge Originally Posted by daytonaM3 Click here to enlarge
        If you want to run a 9sec you will need more torque,why are most people only looking at whp because on the drag strip torque is a lot more important.

        .
        LOL, dude honda's make less tq than these cars and are in the 9's thats not the factor here...


        Its GEARING that makes it all work... F1 cars make low ass tq yet they are fast as hell, how do they do that? RPM + GEARING....

        In all honesty you want to be at the top of 4th when crossing the line... Problem i see is if Rob was at top of 4th @ 137 then the higher powered cars will need to shift into 5th which will hurt the ET/MPH... Taller tires or changing the final drive will take car of that, or rev those motors out!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by gringotegra Click here to enlarge
        Its GEARING that makes it all work... F1 cars make low ass tq yet they are fast as hell, how do they do that? RPM + GEARING....
        Yes, and the S54 has a long powerband and tight gearing.
      1. gringotegra's Avatar
        gringotegra -
        In the V8 Auto world, anything trapping over 135 should technically be in the 9's....Thats why when you go over 135 they require you to have an NHRA license... Very few, and i mean Very few manual cars actually run 9's@135...

        and holy $#@!, Evil Twin Rob's car made 724whp? was just checking out his vids, damn...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by gringotegra Click here to enlarge
        In the V8 Auto world, anything trapping over 135 should technically be in the 9's....Thats why when you go over 135 they require you to have an NHRA license... Very few, and i mean Very few manual cars actually run 9's@135...
        It's all in the suspension at that point. Cars like the M3 are set up for the road course and the stiff suspension and front engine layout works against them.
      1. gringotegra's Avatar
        gringotegra -
        I should correct mysely, in the Auto world in general not just V8 Auto world...


        I would say that the gearing with the M3 isnt hurting it then...

        Can anyone point me in the direction on where i can see the gear ratios + Rear end ratio of the m3?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by gringotegra Click here to enlarge
        Can anyone point me in the direction on where i can see the gear ratios + Rear end ratio of the m3?
        Here:

        1st Gear Ratio 4.23:1 2nd Gear Ratio 2.53:1
        3rd Gear Ratio 1.67:1 4th Gear Ratio 1.23:1
        5th Gear Ratio 1.00:1 6th Gear Ratio 0.83:1
        Final Drive Ratio 3.62:1
      1. ccsykes's Avatar
        ccsykes -
        Click here to enlarge Originally Posted by daytonaM3 Click here to enlarge
        If you want to run a 9sec you will need more torque,why are most people only looking at whp because on the drag strip torque is a lot more important.

        I also do not understand why the HPF Kits/S54 turbo engines has less torque as a turbo S50B30/32.
        The HPF kits are putting down plenty of TQ. The Stag 2.75 puts down 550+, that is more than enough given the HP.
      1. ccsykes's Avatar
        ccsykes -
        Click here to enlarge Originally Posted by gringotegra Click here to enlarge
        In all honesty you want to be at the top of 4th when crossing the line...
        Yes, but not with 3:62's. If I'm correct that is what Rob is using. Most drag cars are running 4:30-4:56 to get into the top of 4th.

        Yes, you are correct that you want to be in the top of the gear, but the final gear ratio is not optimal. The transmission gears are too high. That is why you have a high MPH but a lower ET.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ccsykes Click here to enlarge
        The HPF kits are putting down plenty of TQ. The Stag 2.75 puts down 550+, that is more than enough given the HP.
        There is plenty of power and torque, that is definitely not the issue.
      1. gringotegra's Avatar
        gringotegra -
        Click here to enlarge Originally Posted by ccsykes Click here to enlarge
        Yes, but not with 3:62's. If I'm correct that is what Rob is using. Most drag cars are running 4:30-4:56 to get into the top of 4th.

        Yes, you are correct that you want to be in the top of the gear, but the final gear ratio is not optimal. The transmission gears are too high. That is why you have a high MPH but a lower ET.
        Interesting enough, i just threw in the numbers for the M3's gears into a calculator i use alot for my car..

        i compared it to my transmission which is well geared quite well for the 1/4.. i used the stock tires for the M3 255/35/19..

        http://www.teammfactory.com/gearcalc...ission+1+%26+2
      1. gringotegra's Avatar
        gringotegra -
        Its not as bad off as you might think... its almost identical to mine as far as mph in each gear..well more like 3rd/4th... i think they would benefit from a taller 1st/2nd gear tho
      1. ccsykes's Avatar
        ccsykes -
        Click here to enlarge Originally Posted by gringotegra Click here to enlarge
        Its not as bad off as you might think... its almost identical to mine as far as mph in each gear..well more like 3rd/4th... i think they would benefit from a taller 1st/2nd gear tho
        And that is where the E46 M3 doesn't do well. Maybe HPF can make some taller gears for 1-2. They are planning on making syncros for the tranny. I don't know whether the investment in tooling would pay off though. Not sure how popular drag racing an M3 is going to be. They seem to be more popular on the road course.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by ccsykes Click here to enlarge
        They seem to be more popular on the road course.
        Or the dyno Click here to enlarge
      1. gringotegra's Avatar
        gringotegra -
        Click here to enlarge Originally Posted by ccsykes Click here to enlarge
        And that is where the E46 M3 doesn't do well. Maybe HPF can make some taller gears for 1-2. They are planning on making syncros for the tranny. I don't know whether the investment in tooling would pay off though. Not sure how popular drag racing an M3 is going to be. They seem to be more popular on the road course.

        It would benefit from it but my car will also benefit from a taller 1st gear... as is the M3 should be able to do it..


        Is 8000rpm the highest these can rev? The seem to have a good flowing head, does anyone make better valve springs for them?
      1. ccsykes's Avatar
        ccsykes -
        Click here to enlarge Originally Posted by gringotegra Click here to enlarge
        Is 8000rpm the highest these can rev? The seem to have a good flowing head, does anyone make better valve springs for them?
        I had these built for my HPF motor.

        http://store.vacmotorsports.com/vac-...ead-p1340.aspx

        I opted out of the port work though because I felt it unnecessary for an F/I application.

        Click here to enlarge
        Click here to enlargeClick here to enlarge