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

John Cody Forbes cody at 5000tq.com
Tue Oct 5 07:59:25 PDT 2010

HKS Super Mega Flow Reloaded. Yeah, a stupid name, but a great filter. 034 dyno tested one to something like 600whp with minimal vacuum between the turbo and filter.

Cone filters, indeed all K&N style filters, take huge amounts of surface area to flow properly. On K&N's website you'll find a filter area calculator which will show you that that tiny filter you were running is good for like 300bhp.

-Cody (mobile)

On Oct 5, 2010, at 8:23 AM, Joe Pizzimenti <joe.pizzimenti at gmail.com> wrote:

> Have you tried a K&N?
> Or chicken wire, for that matter?  :)
> On Mon, Oct 4, 2010 at 9:30 PM, Hap Maguire <captmagu at gmail.com> wrote:
>> 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 was 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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