[s-cars] MTM chip wastegate adjustment
Cody Payne
Cody.Payne at bconnected.com
Wed Aug 14 09:42:52 EDT 2002
Gents,
Another way to remove the plug which I learned here on the forum...is to drill a 1/8" hole in the plug..then take a machine screw and tap it in to that hole about 1/4" or less then take a pair of pliers and bend the screw until the plug comes loose. Works like a charm.
cp
-----Original Message-----
From: Robert Pastore [mailto:rpastore at animalfeeds.com]
Sent: Wednesday, August 14, 2002 7:44 AM
To: 'Bob Rossato'; konecc at snet.net; s-car-list at audifans.com
Subject: RE: [s-cars] MTM chip wastegate adjustment
Bob
Are you saying we should buy Paul some tools as a baby gift?
-----Original Message-----
From: Bob Rossato [mailto:bob.rossato at att.net]
Sent: Tuesday, August 13, 2002 9:49 PM
To: konecc at snet.net; s-car-list at audifans.com
Subject: RE: [s-cars] MTM chip wastegate adjustment
Rich,
A couple of weeks ago I gave Paul K. a hand doing this to his S6. Neither
one of us had done this mod before so we were sort of flying blind being led
only by poor memories of old posts on how to do it.
First of all, it isn't really a plug that needs to be pulled out. There is
a metal disc that covers the adjustment screw and you essentially need to
machine it away.
The adjustment screw has a 5mm or 6mm hex in it (Don't really know the size
as Paul didn't have any metric allen keys, and the english one that was
close enough wasn't marked so I'm guessing at the size.), and it is directly
under the disc so you don't want to drill any further than it takes to break
through the disc or you risk damaging the hex opening. I would use the
biggest diameter drill bit that fits within the opening where the disc is.
We ended up using a 3/8" drill bit (limited by tool availability again) and
it was just barely big enough to leave an opening that allowed us to muscle
the allen key in (because you can't drill all the way through the disc the
angled tip of the drill results in an opening that is obviously smaller than
the drill bit diameter). An end mill bit on a dremel might work better.
It was difficult to get the adjustment screw to turn, but I don't know if
that was due to loctite or just the fact that there was still some
interference from the disc. I just kept twisting it back and forth and
eventually it started turning.
We ended up doing this with the cap removed but I don't see any reason why
you can't do it with the cap on.
I think this cured, or at least greatly minimized, the noise Paul was
getting (he also has the MTM chip) but we'll have to wait until he gets back
from vacation next week for a full report.
Bob
> -----Original Message-----
> From: s-car-list-admin at audifans.com
> [mailto:s-car-list-admin at audifans.com]On Behalf Of konecc at snet.net
> Sent: Tuesday, August 13, 2002 1:19 PM
> To: s-car-list at audifans.com
> Cc: konecc at snet.net
> Subject: [s-cars] MTM chip wastegate adjustment
>
>
> I've searched through the archives but still don't have a clear picture
> regarding MTM's recommendation of cranking in 6 turns on the
> wastegate when
> upgrading the UrS4's with their Stage 1+ (3 bar) chip.
>
> I just installed mine last night and it runs like a rocket (21-22 psig
> boost on the gauge), but I get a "squack" when I change gears or on/off
> throttle at high boost, especially in the lower gears.
>
> According to the non-technical person at MTM, that adjustment is required
> to compensate for the higher boost, but I couldn't get any more
> out of them.
>
> What's the consensus on the adjustment, is it necessary or
> desirable? Does
> it defeat some of the safety aspects that the ECU provides? Will it cure
> that sound?
>
> Any tips on how to heat the threads to release the Loctite, once I get
> center plug drilled and pulled out (heat gun?)? Would it be easier to
> remove the 6 or 8 nuts and remove the entire top to do this?
>
> -- Rich A.
> '93 S4
>
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