WANTED! 1.9 Bar Wastegate spring

[prj]

65 euros Just remembered that I have one that will run 1.8 to 2.1 Bar. I'd need to check what it will run on a stock spring cap. Dimitri had a 1.7 Bar spring off me a while back but not sure if he used it or not.

It's too short, so it's collecting dust.

[Rusty]

Too short for what? Gives 1.7 Bar on a stock ABY cap.

I'll have it back if you're not using it.

[prj]

Too short for what? Gives 1.7 Bar on a stock ABY cap.

That's not all there is to it.
Yes, it gives 0.7 bar, except it cracks way too early.

[Rusty]

That makes no sense.

[prj]

Springs are not linear from what I understand and this one seems to open a little bit very easily. I am guessing because it is so short. 1.5x shorter than stock spring.

[Rusty]

Crack is a direct function of pre load; if you increase pre load then you increase WG crack pressure - I've done some testing to verify my mathematical model. It's shorter because spring rate is much higher than stock. Stock spring compression is ~46mm on an ~80mm spring, giving a compressed length of 34mm or so. F=k.x applies and thus a 29.5mm compression (2.5" free length) of a spring with over twice the spring rate is higher than the stock, hence higher crack pressure. If you mean that 1.7 Bar is too early then that's a different matter As above, I'll have it back if you're not going to use it.

Edit - this is the spring you have:

http://www.assocspring.co.uk/p/14/compression_springs-stainless_steel/?min_1=42.85&max_1=42.85&min_2=3.76&max_2=3.76&min_3=63.50&max_3=63.50&PAGE_ID=1

[Rusty]

http://www.assocspring.co.uk/p/14/compression_springs-stainless_steel/?min_1=42.85&max_1=42.85&min_2=4.11&max_2=4.11&min_3=63.50&max_3=63.50&PAGE_ID=1

This spring is the one I referred to that can be adjusted between 1.8 and 2.1 Bar on a stock WG cap. To get 1.9 Bar you will need to back off the adjusting screw around 4 turns. On a bone stock cap, you'll get just over 2 Bar - you're looking for a load of around 230N at a length of 34mm.

[twenty valve]

still need one

If you have one lying around please speak up!! Otherwise will have to make a special order from 034

[Jamo]

I had one for sale on the forum for 2 weeks! Sold now last week should watch the for sale section!
There is a 2.2 for sale at the mo

[twenty valve]

yeah I kicked myself when I missed yours

2.2 is a bit much. my engine peaks at ~2.15bar and holds ~1.85bar to red line

Its about time I unveiled my car fully i think...

[Jamo]

2.2 is 1.2 bar in boost terms maybe too much maybe not had no experience of them

[twenty valve]

Never thought about that. 2.2 bar could be absolute pressure in which case 1.2 bar gauge pressure..

[Jamo]

It is absolute, all the springs are rated this way

[Biturbo]

I have one 2bar £25 including postage in uk.Used for about 5 miles is too much for stock k24 turbo.

[Jonas_R]

I have a 1.9 bar spring if you still need one?