[s-cars] 1.9 Bar Wastegate Spring

[Mark Strangways]

Yeah, I read that article also.


----- Original Message ----- 
From: <cody at 5000tq.com>
To: <s-car-list at audifans.com>
Sent: Wednesday, December 27, 2006 2:12 PM
Subject: Re: [s-cars] 1.9 Bar Wastegate Spring


> Quoting Mark Strangways <StrangConst at rogers.com>:
>
>
>>
>> A higher spring rate will solve some WG creep issues as will cranking the
>> spring seat down.
>
>
> Ah, but to make sure we keep things clear here you should be aware
> that he is not talking about wastegate creep. Wastegate creep is when
> your wastegate doesn't flow enough and your boost creeps up higher and
> higher past the desired level at high RPM.
>
> What you meant has no "name" that I have ever heard, but is caused by
> small ammounts of pressure ever so slightly cracking the wastegate
> open before the desired boost level is obtained, thereby deverting
> gases that we would prefer to be putting effort towards spooling the
> turbo. Higher spring tension compensates and fixes the problem, or a
> simple pressure relief valve in the lower wastegate chamber pressure
> line set just below your desired boost level works better.
>
> The best part about using the relief valve is you can put it in the
> car somewhere and actually adjust how fast the turbo spools - usefull
> for the track so you can let it spool slower to help prevent breaking
> the tieres loose near the exit of a corner. That and you can also use
> the relief valve to get some mid-range power. It opens at X pressure,
> and doesn't close until about 10psi lower then X pressure. That way
> you can get an extra 2 or 3 PSI, then it opens and lets the WGFV do
> it's job.
>
> I use a pressure relief valve as the sole boost control on my 5ktq.
> The valve I use can be had from any supplier or Norgren pneumatic
> supplies for $18. Let me know if you need a part number.
>
> -Cody Forbes
> http://www.5000tq.com
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