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  • IS 38 Turbo

    Hi Everyone, has anyone upgraded their turbo from a IS20 to a IS38 turbo?
    I want to upgrade, I've bought the turbo and now need to source a supplier for the software.
    Any ideas? what are my options? thanks

  • #2
    underground performance have done several, Cheltenham
    optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

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    • #3
      As above, go see Underground Performance.

      Or, if you want a DIY type tune, consider Spectune (aka tarmac Engineering based in Brisbane) or Integrated Engineering. Personally I am a fan of the DIY type tunes, and have used them on several cars with success (currently have my Mk7 GTI tuned with Integrated Engineering).
      2017 Ford Fiesta ST the go kart

      2015 Audi SQ5 bi-turbo V6 TDI family hauler

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      • #4
        What's the go? simply replace the IS20 with an IS38 and get custom tune to suit?

        Or is this something to think about once you've done your Intake, DP etc.

        Do you need other supporting mods like Intercooler?

        If not, how much is there to be gained with an IS38 swap + custom tune while leaving the rest stock,
        vs. keeping the IS20 and going for an intake + catted DP + tune?


        (I know the OP has to replace the IS20)

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        • #5
          Originally posted by InsaneAsylum View Post
          What's the go? simply replace the IS20 with an IS38 and get custom tune to suit?
          Pretty much. It just bolts into place and replaces the IS20. There are also other bolt-on options these days that are more reliable than the IS38 such as the Garrett Powermax turbo.

          Originally posted by InsaneAsylum View Post
          Or is this something to think about once you've done your Intake, DP etc.
          Either or. Even without upgrading the intake/exhaust etc you will gain more top end power and torque with the larger turbo. But you will sacrifice a small amount of power down low as the larger turbo takes longer to come onto boost compared to the smaller IS20.


          Originally posted by InsaneAsylum View Post
          Do you need other supporting mods like Intercooler?
          Always a good idea to upgrade the intercooler if you are chasing more power (more consistent power) but its not necessary. But even upgrading to the Golf R intercooler which you can pick up used for $100-150 is a cost effective mild upgrade as its thicker than the stock Tiguan intercooler.

          Originally posted by InsaneAsylum View Post
          If not, how much is there to be gained with an IS38 swap + custom tune while leaving the rest stock,
          vs. keeping the IS20 and going for an intake + catted DP + tune?
          IS38 plus software but with stock hardware vs IS20 plus software plus bolt ons.....probably not much too be honest. Possibly another 10-15kw and 30-40nm in the mid range and top end.
          2017 Ford Fiesta ST the go kart

          2015 Audi SQ5 bi-turbo V6 TDI family hauler

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          • #6
            Originally posted by Lucas_R View Post
            As above, go see Underground Performance.

            Or, if you want a DIY type tune, consider Spectune (aka tarmac Engineering based in Brisbane) or Integrated Engineering. Personally I am a fan of the DIY type tunes, and have used them on several cars with success (currently have my Mk7 GTI tuned with Integrated Engineering).
            Thanks for the info. Integrated says that they cannot help at this time, they have yet a package for the Tig.
            I will try Underground and spectune. I was honestly hoping to just change the turbo and software and upgrade as I go-along.

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            • #7
              Originally posted by h100vw View Post
              underground performance have done several, Cheltenham
              thanks I'll email them and see what they have available.

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              • #8
                Originally posted by Lucas_R View Post
                Pretty much. It just bolts into place and replaces the IS20. There are also other bolt-on options these days that are more reliable than the IS38 such as the Garrett Powermax turbo.



                Either or. Even without upgrading the intake/exhaust etc you will gain more top end power and torque with the larger turbo. But you will sacrifice a small amount of power down low as the larger turbo takes longer to come onto boost compared to the smaller IS20.




                Always a good idea to upgrade the intercooler if you are chasing more power (more consistent power) but its not necessary. But even upgrading to the Golf R intercooler which you can pick up used for $100-150 is a cost effective mild upgrade as its thicker than the stock Tiguan intercooler.



                IS38 plus software but with stock hardware vs IS20 plus software plus bolt ons.....probably not much too be honest. Possibly another 10-15kw and 30-40nm in the mid range and top end.

                Appreciate your response mate. Nice to hear a different mod path apart from the usual Stage 1 tune or Intake + DP + Stage 2 tune

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                • #9
                  Originally posted by Eman View Post
                  Thanks for the info. Integrated says that they cannot help at this time, they have yet a package for the Tig.
                  I will try Underground and spectune. I was honestly hoping to just change the turbo and software and upgrade as I go-along.
                  Let us know how you get on, hopefully you can get a before and after power run to see the difference. As I mentioned, most people do the IS38 or bigger turbo after Intake and DP so don't really know how applying an IS38 to the stock setup would go power wise.

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                  • #10
                    Originally posted by Eman View Post
                    Thanks for the info. Integrated says that they cannot help at this time, they have yet a package for the Tig.
                    I will try Underground and spectune. I was honestly hoping to just change the turbo and software and upgrade as I go-along.
                    Better way to go is fit the supporting hardware. The IS38 wont perform that well without the hardware upgrades fitted. Be prepared to fit an intercooler, downpipe and intake before you get positive answers.
                    optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

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                    • #11
                      Originally posted by h100vw View Post
                      Better way to go is fit the supporting hardware. The IS38 wont perform that well without the hardware upgrades fitted. Be prepared to fit an intercooler, downpipe and intake before you get positive answers.
                      In theory, the golf R pushes 206kw on the IS38 turbo with stock DP and intercooler ( I understand the intercooler is different) Intercooler aside I should see massive gains in kw with my DP? Do you reckon the Golf R intercooler can be a direct bolt on to the Tiguan R Line i.e. pipes etc?

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                      • #12
                        Originally posted by Eman View Post
                        In theory, the golf R pushes 206kw on the IS38 turbo with stock DP and intercooler ( I understand the intercooler is different) Intercooler aside I should see massive gains in kw with my DP? Do you reckon the Golf R intercooler can be a direct bolt on to the Tiguan R Line i.e. pipes etc?
                        Certainly recommend the downpipe, intake and intercooler not required.

                        Spectune did mine (via Eurospec Tuning in Perth). Have been running for 2 years now with no issues.
                        2019 Tiguan R-Line - IS38 Turbo - Spectuned - X-Force Downpipe - RS7 Spark Plugs - CTS Inlet Elbow - ECS Inlet Pipe - K&N Panel Filter - Golf R Muffler - APR Exhaust Controller - Superpro Rear Swaybar - Digital Dash Retrofitted - 034 Dogbone Mount - DBA T3 Rotors & Pads - Golf R Springs

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                        • #13
                          Originally posted by h100vw View Post
                          underground performance have done several, Cheltenham
                          Underground performance said its possible however from the email I see that they prefer an upgraded intercooler and DP. I do not have either.

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                          • #14
                            Originally posted by Eman View Post
                            Underground performance said its possible however from the email I see that they prefer an upgraded intercooler and DP. I do not have either.
                            Doesn't seem right to half do the job.
                            optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

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                            • #15
                              Okay.. there are not many places in Melbourne that have a software package for the Tig on the IS38 Turbo. So I will upgrade the intercooler and downpipe. I do not want to spend money until I know for certain that i can upgrade to the IS38. Do you guys know any other places I can consider to do this? I am only in the planning stage.
                              My thought process was I have the CHHB engine and IS20 turbo which is the same as the GTI so they should be the same to upgrade. There are so many GTI guys that are upgrading their Turbo's to the IS38.
                              thanks in advance.
                              Last edited by Eman; 17-03-2023, 10:14 AM.

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