Re: wg spring in mc turbo

[Sachelle Babbar <sbabbar@iris.nyit.edu>]

thanks, Charlie. I don't need it for myself, but it's a great offer for
the listers I've been suggesting this to.

>From the sounds of your spring, 1.6-1.7 bar is a very reasonable boost in
overall power with a good (needed) boost at the bottom of the rev range
without getting ridiculous.

I feel that the mc spring, along with age, is such a detractor to the
generally good performance of the engine. A slightly stiffer, linear
spring will give a nice, flat feel to the power curve, akin to the 3b
turbo, but not so powerful.

As it is with my kh spring, it gives a slight boost to bottom end, mid
range is flat and not peaky (as with the mc spring and the wastegate
cointroller), top end feels even with the mid range and has a mild
increrase of 1.6-1.7 bar. In short, your mc will feel more torquey.

>From charlie's description, his spring will give this effect. Having
driven and modified my old kh, I can say that the mc with the slightly
stiffer spring that allows for slightly higher boost at lower rpms will
mimic the high compression feel of the kh and generation 3 mc. May be the
alternative for the k 24 modification.


****************************************************************************
*Steve                                             Sachelle Babbar
*'87  5000CS Turbo 5spd 1.3-2.0 bar             <SBABBAR@IRIS.NYIT.EDU>
*Cockpit adjustable wastegate, AudiSport badge
*
*Disclaimer:"Any information contained herein is based purely on my own
*personal experience and may not necessarily reflect yours. Use caution as
*your results may vary from mine."
********************************************************************************
                                                                               



On Tue, 23 Nov 1999, Charlie Smith wrote:

> Earlier, Sachelle Babbar wrote:
> > 
> > Gerard, it's a waste to "get" a kh wastegate and cap to simply use the
> > spring and cap only. These wastegates on our cars are too rare. Just use
> > your imagination and see what springs you might be able to get from a
> > junk yard that may fit inside the mc spring to assist it. You'll only need
> > a soft spring. Other option is buy a 1.6 bar spring from someone. Last and
> > easiest option is again, use your imagination and shim the spring.
> 
>     Being unable to lurk past this one, I'll offer this to you.
>     
>     A few years ago, I had a batch of MC wastegate springs made
>     by a local spring company.  I've still got about 15 or 20
>     left if someone's in need.
> 
>     These springs alone in the MC wastegate will give you about
>     1.6 or 1.7 bar boost instead of the stock 1.3 bar.  To get this
>     you have to bypass the overboost control from the ECU. 
> 
>     For $20 I'll send you a spring and instructions on installation, 
>     and instructions on the one-wire bypass for the overboost limit.
>     This is nothing fancy, but it helps and it's pretty much at my
>     cost for the spring, packaging, and shipping.  Send me an email
>     with your postal address.
> 
>     My appologies to the list for what some may consider a commercial
>     message, but I'm really just trying to help build faster Audis!
> 
>     - Charlie
> 
> 
>  Charlie Smith   charlie@elektro.cmhnet.org  614-271-1418  
>  http://elektro.cmhnet.org/~charlie/  Columbus Ohio   USA
> 
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> 
>