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    • APR releases 10.1:1 compression forged Mahle pistons for the 2.5 TFSI turbocharged inline-5 motor

      APR is now beefing up the internals of the 2.5 TFSI Audi inline-5 motor. As you may recall, APR last year released their Stage III turbocharger upgrade for the Audi TT-RS equipped with the 2.5 TFSI motor. This Garret GT35R based package is capable of over 600 horsepower at the wheels. That would seem to be the range where APR is drawing the line on the stock internals and with offering these Mahle pistons 2.5 TFSI owners should now be able to push further.

      The motor likely would be able to handle a bit more than 600 horsepower at the wheels but then questions of durability and reliability arise. If you need more htan 600 wheel and want to do so safely (and who doesn't?) these pistons are recommended. They are slightly higher compression at 10.1:1 versus the 10.0:1 of the stock motor. They also offer 83mm bore versus 82.5mm for the stock pistons.

      Pricing $1,099.99 for a set and APR also has rods to go with them. It will be interesting to see how much further the 2.5 TFSI can go now.









      • Forged pistons
      • Proprietary APR / MAHLE design
      • Proprietary MAHLE 142S alloy
      • Low noise materials
      • Low thermal expansion for tighter tolerances
      • OEM piston compression bowl profile
      • 83mm oversized design
      • 10.1:1 compression ratio
      • MAHLE 22mm German tool steel wrist pins included
      • MAHLE low-drag rings included
        • Top - Barrel-Faced Steel (File to Fit)
        • Second - Tapered Face Ductil Iron (File to Fit)
        • Oil Rings - 3 Piece Standard Tension

      • 320 grams per piston
      • Hard anodized top ring grooves to prevent micro-welding
      • MAHLE proprietary Grafal anti-friction coated skirts
      • OEM oil squirter notches
      • First landing accumulator grooves for top ring seal promotion
      • Ultra flat ring grooves for ring seal promotion
      This article was originally published in forum thread: APR releases 10.1:1 compression forged Mahle pistons for the 2.5 TFSI turbocharged inline-5 motor started by Sticky View original post
      Comments 7 Comments
      1. fastgti69's Avatar
        fastgti69 -
        Mahle is one of the best companies to go with for building motors.
      1. Sticky's Avatar
        Sticky -
        I don't disagree.

        I wonder with the pistons and rods what the 2.5 TFSI will do now? And will they run into fuel problems?
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I don't disagree.

        I wonder with the pistons and rods what the 2.5 TFSI will do now? And will they run into fuel problems?
        I'm sure they will always run into fuel problems with direct injection. The only people i know that can do it is APR...

        It seems like they can do anything they want.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        I'm sure they will always run into fuel problems with direct injection. The only people i know that can do it is APR...

        It seems like they can do anything they want.
        They continue to prove they are the best.
      1. chrisisnapping's Avatar
        chrisisnapping -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I don't disagree.

        I wonder with the pistons and rods what the 2.5 TFSI will do now? And will they run into fuel problems?
        APR says that their upgraded HPFP for the 2.5TFSI leaves plenty of headroom for safety and further power advances.

        At 4500rpm their new HPFP flows around 700cc/m more than stock and well over 1000cc/min more at 7500. The stock HPFP was able to provide pretty adequate fueling on pump gas with a GTX3076R. So they may be able to see mid-high 700whp numbers on this HPFP. Getting new injectors for APR is a cakewalk as they've done it a bunch of times before for other engines, so that shouldn't be an issue either. I think their biggest limiting factor in power advance is fitment of a larger turbo. From what I understand the GTX3576R was a pretty tight fit.

        P.S.
        The Stage 3 kit is a GTX3576R.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by chrisisnapping Click here to enlarge
        APR says that their upgraded HPFP for the 2.5TFSI leaves plenty of headroom for safety and further power advances.

        At 4500rpm their new HPFP flows around 700cc/m more than stock and well over 1000cc/min more at 7500. The stock HPFP was able to provide pretty adequate fueling on pump gas with a GTX3076R. So they may be able to see mid-high 700whp numbers on this HPFP. Getting new injectors for APR is a cakewalk as they've done it a bunch of times before for other engines, so that shouldn't be an issue either. I think their biggest limiting factor in power advance is fitment of a larger turbo. From what I understand the GTX3576R was a pretty tight fit.

        P.S.
        The Stage 3 kit is a GTX3576R.
        I should have typed the full turbo name out but in the link I do mention the whole name. I just appreviated but yes GTX35 as you stated.

        I'm pretty excited for the RS Q3 providing this is all accurate. Could you imagine a 700 whp SUV weighing under 4000 pounds with all wheel drive and a dual clutch trans? That thing would be f'ing ridiculous.
      1. chrisisnapping's Avatar
        chrisisnapping -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I should have typed the full turbo name out but in the link I do mention the whole name. I just appreviated but yes GTX35 as you stated.

        I'm pretty excited for the RS Q3 providing this is all accurate. Could you imagine a 700 whp SUV weighing under 400 pounds with all wheel drive and a dual clutch trans? That thing would be f'ing ridiculous.
        I got you on shortening it, i just wanted to make sure you got that "x" in there Click here to enlarge

        Audi is really stepping up their game on their recent generation of vehicles. I'm interested to see what they do with the A4/A5. Will they use the same/similar 2.0T as the one found in the mk7 GTI or bump them up to the engine found in the mk7 Golf-R?

        a 700whp daily driven SUV with all the normal creature comforts one comes to expect in a luxury vehicle would be pretty $#@!ing awesome.