[s-cars] "Negative Boost", Oh yes Martha its that dreaded subject once again

[qshipq at aol.com]

 AEM will laugh at you, and I chuckle that a couple of dolts here at LT1Q tech could have saved all three of you amigos a lot of time/money just glancing at the engine bay.  When the LT1Q got to 'filter' stage, Dupree and I spent several hours on the phone with "cone-head" engineers (my term).  Those cone filters flow like crap, worse than a stock panel filter most of the time.  IIRC, the 'best' (cough) performance v8 application cones flowed somewhere in the 500cfm range, which for reference, is roughly a stock S6 motor running 20 psi.  The POS filter in that pic you show, I bet doesn't even get to 500cfm....   And you probably need at least double that.  Which means you will likely need to get a/2 marine 'spark arrester' application/s (LT1Q), or you will need to make a y-pipe for 2 'good' (oxymoron to me) cone filters.  OR, get something like the monster Toyota FZJ80 stock application filter, and make a housing for it.  I suspect the easiest thing would be to double/triple up the cones on a single stack or y-pipe.

Brendan, figure the Theoretical engine flow/cone flow = # of cones.  I say you will be at 3 to eliminate 'negative boost'

Too funny.

Scott J





 


 

 

-----Original Message-----
From: Hap Maguire <captmagu at gmail.com>
To: s-car-list <s-car-list at audifans.com>
Sent: Mon, Oct 4, 2010 8:30 pm
Subject: [s-cars] "Negative Boost", Oh yes Martha its that dreaded subject once again


S-Heads

A sporadic boost issue has been driving Tufty Jones, Brendan Rudak and yours 
truly very crazy for the last several months. Last week Brendan and I set about 
logging runs on da computer to see if there was a software issue and everything 
checked out perfectly. We even tried swapping out the Tial 44mm wastegate for a 
plug and play Turbosmart WG with a minor change invloving a slightly laggier but 
still inconsistent boost between 10-15 lbs due to a 7 lb vs 1 bar spring in the 
Turbosmart WG. Tufty and I finally decided to do an intake tract leak check even 
though we knew it couldn't be that as this car has basically a full hard pipe 
tract with the only silicon pieces at the joints for engine flex. This would 
also eliminate the BOV as a potential source. Well as the pressure built upwards 
of 30 lbs the only leak we found was from the test valve. The intake was solid. 
To do the test though, we had to remove the 4" elbow that runs from the air 
cleaner to the turbo inlet. As Tufty wa
 s scratching his head yet again he took a good look at the cleaner and Voila, 
we had found our "Negative Boostie". 

As you can see from this inside view, the plastic frame has broken down. This 
allowed the cleaner to shrink in on itself as Da BEEG Comp turbo literally 
sucked the life from its veins. You can also see the crease lines on the outside 
of the cleaner and visualize what was going on. 

http://i935.photobucket.com/albums/ad199/hapster47/a-1-3.jpg

http://i935.photobucket.com/albums/ad199/hapster47/a-3-1.jpg

This air cleaner was mounted to a 4" aluminum pipe that had a 90 degree bend and 
the cleaner just hung from the pipe without touching anything else. You can just 
see the pipe here in this shot.

http://i935.photobucket.com/albums/ad199/hapster47/dm-63.jpg

Well mucho thanks to Tufty and Brendan for their continuing help in perfecting 
this beast. Something tells me this is gonna be a long story. Throughout this 
all, the car still ran beautifully if somewhat muffled because of the cleaner. I 
gotta see if I can get a refund or do you think AEM will just laugh???

Hap, wit dakine "Negative Boost" nomoh not(and yes Mr Baloney that's 3 
negatives) from Evahboost, Maguire
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