997 tt/rs

Guys, It seems Porsche only sells the complete Westgate for both models. Maybe someone has an idea where to buy both such springs? I want to test both.
thanks
K

heliolps2

Hey friend,
Try FVD.com

997 tt/rs

They got only upgraded ☹️

peterpullin

hi
you can simply shim the one you have. first measure actual pressure with your old spring. use an external tool for precise readings - not the oem toy. then adjust spring load with shims for higher setting until your readings show the other value you wanted to reach.

no difficult thing. nost tricky is dismantling wastegate (corrotion and spring load - be careful) and thickness of springs.

fritz k.

In principle Peter is of course right, you can raise the preload of the spring by shims and thus increase the boost pressure.
The disadvantage is that you may have to change the thickness of the shims several times to achieve the desired result.

In my opinion it doesnt makes sense to change the boost pressure by using a different spring or shims. Also the result of the so called "1 bar" springs is not to determine because the effective boost pressure depends on the actual conditions in a 30 years old car, e.g. the condition of the diaphragm, the valve guide and the valve seat. If a "1 bar" spring produces 1 bar, it is a coincidence.

More helpful is this solution, which varies the pressure in the wastegate's lower chamber and allows a stepless adjustment of the boost pressure.



The more modern variant works with an electromagnetic solenoid valve in the control line and can map an adjustable control process with an appropriate controller.

I like my old school variant better.

Fritz

997 tt/rs

Thank guys.
the thing is I have no idea which spring is installed on my car. I noticed the gauge shows 0.9 above 5000 rpm which surprised me.
I measured acceleration of the car and had a chance to to measure acceleration of second car which is 100% stock and it turned out that the second car accelerate 100-200km/h 2 sec faster......
I would like to install oem spring or 3.6 spring, but both are not available from porsche separately.

Scott Dunavant

I have a extra factory Boost Spring with only 900 miles, But sat in the car for 20 years.
Try Patrick Motorsports. He sells them.

997 tt/rs

on the web they offer only 1.05 spring

cobalt

It was my understanding Wastegate springs of this era were not all that precise. That is why you see them listed like FVD .9-1.0. I don't believe you can order one or the other. AFAIK this is why Porsche made adjustments using shims to achieve the proper output and opening of the WG. It is also why they give a pressure range when testing the WG to factory specs.

Not sure if these help but you could try them.


https://www.ebay.com/itm/25564078500...saAqr0EALw_wcB

Metal Guru

A long time ago, I installed a mechanical boost controller back in the engine compartment. It's a lot easier to experiment with that than playing around with springs.