[s-cars] How much boost?

Fri May 6 23:33:43 EDT 2005

Where are you measuring the boost pressure ?
IE, where are you taping into the system ?

Mark
----- Original Message ----- 
From: "Tony Curran" <tony.curran at sympatico.ca>
To: "Tony Curran" <tony.curran at sympatico.ca>; "Robert Myers" 
<Bob at chips-ur-s.com>; <s-car-list at audifans.com>
Sent: Friday, May 06, 2005 9:41 PM
Subject: RE: [s-cars] How much boost?

> Hi Bob,
>
> A question about these boost numbers I'm seeing. Although not 100% 
> confident
> in the actual numbers yet, what are the limiting factors that keep the 
> boost
> in the expected range of 22-23 PSI? Now recall I have done the monster air
> intake modification. I have replaced the stock 3" hose which has two 90
> degree bends plus a contriction in the middle with a 4" ram air system 
> plus
> removal of the MAF grills. Wastegate is in stock position.
>
> Question is, would this not allow the turbo to "blow harder" for want of a
> better expression.
>
> I have reproduced the higher boost nimbers hitting 25 and 26 PSI on two
> separate runs, watched by my co-pilot wife. It only reached these numbers
> for a very short period when I hit about 180kmph (110mph) then backed off.
> This is not something I'm going to be doing very often.
>
> I'm just wondering if the cold air intake mod could be the difference?
>
> The digital pressure gauge I'm using is a high precision instrument -
> retails for around us$200. Details can be found at:
>
> http://www.smcetech.com/CC_host/pages/custom/templates/smc_v2/prodtree_produ
> ct_2.cfm?&cc_nvl=((catalogCode,smc),(lineCode,INS),(productCode,5030),(prodt
> reeID,13315),(nodeCode,5030))
>
> Cut and paste full link, including parentheses, in to browser for it to
> work.
>
> Cheers,
>
> Tony
>
> -----Original Message-----
> From: s-car-list-bounces+tony.curran=sympatico.ca at audifans.com
> [mailto:s-car-list-bounces+tony.curran=sympatico.ca at audifans.com]On
> Behalf Of Tony Curran
> Sent: May 3, 2005 8:57 PM
> To: Robert Myers; s-car-list at audifans.com
> Subject: RE: [s-cars] How much boost?
>
>
> Thanks Bob. I do question the digital gauge calibration, so I'll work on
> that and test again.
>
> Thanks
>
> Tony
>  -----Original Message-----
>  From: Robert Myers [mailto:Bob at chips-ur-s.com]
>  Sent: May 3, 2005 9:45 AM
>  To: tony.curran at sympatico.ca; s-car-list at audifans.com
>  Subject: Re: [s-cars] How much boost?
>
>
>
>  Tony,
>
>  That sounds pretty high to me.  For MRC stage 2 you should be seeing 
> 22-23
> psig maximum boost levels.  You might possibly see a spike up to 24 or 
> even
> 25 after reaching 23 psig and then suddenly snapping the throttle shut but
> that, if it happens at all, should be purely transitory.  27 psig is too
> high for consistent operation.  Your stage 2 software is designed for the
> 22-23 psig level.  Consistently higher boost levels will likely produce 
> lean
> mixtures which, with prolonged exposure, could result in excessively high
> exhaust temperatures leading to things like burnt valves, etc.
>
>  Do you have your wastegate perch screwed down?  If so, it might be a good
> idea to back it off some.  Also one can ask just how sure are you of the
> accuracy of that digital gauge?  A mechanical gauge might be a better 
> idea.
>
>  And you are right.  100 mph gets there pretty quickly.  So does 130.  :-)
>
>  Bob
>
>  At 09:31 AM 5/3/2005, tony.curran at sympatico.ca wrote:
>
>
>    Hi all,
>
>    Did the MRC stage 2 to my car at the weeked and also fitted a digital
> boost gauge. Just wondering with everything just about stock, apart from
> Monster Air Intake mod, what should I be expecting for top end boost? On a
> test at the weekend the gauge imaxed at 27 psi but do I believe that?
>
>    ...and man, does it get to 160km/hr (100mph) very quickly :)
>
>    Tony
>    96 S6
>
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>  Bob
>  Http://Chips-Ur-S.com
>
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