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

Hap Maguire captmagu at gmail.com
Tue Oct 5 09:03:06 PDT 2010


That's exactly what I'm now running. It should be noted that Tufty wanted to install the BMC CDA airbox filter and I rejected this. Foolish on my part. Oh well. The reason for this post is so we can all learn from success as well as failure. In this case, rather dramatic failure.

Hap. wit dakine admission not from Evahboost, Maguire
On Oct 5, 2010, at 8:59 AM, John Cody Forbes wrote:

> 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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