jimlloyd40
Autocross Champion
- Location
- Phoenix
- Car(s)
- 2018 SE DSG
Just curious if anyone has installed an underdrive crank pulley. I have on other brands of cars but I haven't seen anyone mention them in the forum.
I think most don't in these engines because of crack walk issues, though likely more an issue with DSG.
I used them on all my Subarus with no b issue. EVO guys always stayed away from them due to crank walk issues.
I thought crank walk was a manual trans problem.
What would be the advantages of this? I guess I'm new to this.
An underdrive pully can't increase hp. It can decrease hp loss.
I've yet to see anyone replicate the manufacturers claims on a dyno, but seat of the pants in my Subarus days says they revved a little quicker, response was better.
I have a 6mt, so won't be doing it on the GTI. I don't know enough about the DSG to know if there's any risk involved or what the other affects of underdriving your accessories will be.
It can't increase total HP but the HP and torque will come on at a lower RPM. I don't know if underdriving the accessories would be a problem with a GTI but it wasn't a problem on the other brands I used one on. That's why I posted this to hopefully find someone who did install one on a GTI.
Definitely not worth the risk on these engines. Thats why most are going the opposite direction and getting a fluidampr instead
An underdrive pully can't increase hp. It can decrease hp loss.
I've yet to see anyone replicate the manufacturers claims on a dyno, but seat of the pants in my Subarus days says they revved a little quicker, response was better.
I have a 6mt, so won't be doing it on the GTI. I don't know enough about the DSG to know if there's any risk involved or what the other affects of underdriving your accessories will be.
What are the risks? Harmonics and vibrations?
You could be underdriving you oil pump, which could have negative affects on the vvt or oiling.