Help pistons

[Radziiio mk2 TDI]

Help how Many pistons you have to choose. To blow4 bars

 

[Mongler98]

We have no idea what your talking about!
Do you mean how many pistons do you need to push 4 bar? you need all positions to be working.
Or do you mean how many are there to chose from or what positions do you need for performance modification to handle 4 bar of boost?
its not just the pistons, its the connecting rods that you need to upgrade. 58 PSI is a LOT to push out of a mark 2 TDI. we need MUCH more info. is that absolute pressure or 4 bar of added boost?
you also will need custom ground pistons to lower compression.

 

[Radziiio mk2 TDI]

I mean custom pistons to lower compression.

 

[smoking]

What's your engine?

 

[Radziiio mk2 TDI]

Asz 130

 

[smoking]

Most people just machine the stock pistons to lower CR...never heard of anyone actually runing that kind of boost.
Custom pistons are available but they are pretty expensive... https://arrepiado.com/produto/vw-1-9l-2-0l-tdi-diesel-diamond-forged-pistons/
Nowadays an engine like the ASZ goes cheaper than a used turbo, people just don't spend a lot of money on them something like this it's a really cheap way to lower CR...https://www.youtube.com/watch?v=aEC7sVJXV20

 

[Mongler98]

At 58 psi your looking at maybe 5 to 6k at engine parts let alone a turbo that will boost that high? Why so high? Most stick with 35 to 38 psi and add more fuel and start Injecting water meth and propane for more power. Kinda crazy goal here. What you building or is this just a random "hey more boost" thing. It will take massive amounts of modification to handle that level of power.

 

[Radziiio mk2 TDI]

T hank you. I know that need more Money and modyfications

 

[FRtdilover]

Compound guys run at 55-60psi. Are you planning to build a compound setup or just a huge turbo for drag car ?
58 psi isn't common for street cars

BTW pistons will not be an issue except if your tune sucks

 

[Radziiio mk2 TDI]

I mean lowering the compression 15:1 or 16:1

 

[Markus L]

16:1 is good for 4 bar. I have something like 16.5:1. Worked well with 3.8 bar and haven't bother to open engine for any piston modifications after that. I'm probably gonna test 4 bar or more this year, depends on lambda where I end up. VE should be also better than my previous setup's due better turbos and whole airsystem.

I have modified stock ASZ pistons, rods are also stock. Can you tell us more about your setup? What turbos, injectors etc?

 

[mrchill]

You can run 4 bar with 17-17.5:1 safely. It's about the fueling you intend to use