Best motor builder or switch platforms?

FL 4Motion

I’m glad I could help.

I haven’t been keeping a super close eye on the latest and greatest over on he Audi forums tbh, since it’s a hpde car, our focus is mostly on brakes (done) and suspension and weight savings. As far as power modes, we will be staying stage I or II and on pump gas 93 octane.

That said, iirc, there were some issues a little while back with Iroz’s Custom Code (CC) software tuning blowing motors. CC is more, like the name suggests, personalized custom tuning vs the more traditional bench tunes like APR, unitronic, GIAC, Revo etc. now, I don’t know if the issues were ever worked out or what exactly the problem was since stage III and e85 aren’t our main focus.

I do know that to run e85, I did forget to mention that does require iirc an upgraded lpfp, (low pressure fuel pump) and injectors but that’s not too expensive.

You’ll have to research more, but I’m pretty sure that APR and unitronic at least have safe, reliable e85 tunes, especially at the stage I or II level.

I’m willing to bet a lot of the issues arose at stage III e85. To be fair, that is really getting after it and I personally would budget for built motor and trans upgrades for longevity at that level. Also, your research is correct in that the weak point in the ttrs/rs3 motor seems to be the rods.