Too much back pressure = low power

Too much back pressure = low power

03-06-2005, 09:03 AM

#1 (permalink)

BLujan

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Join Date: Dec 2004 Location: Martinez, CA Posts: 13

Too much back pressure = low power

Well I got to dyno my truck today at WINspeeds/BRG Dyno day, I was glad to finally meet some of you guys.
I was pretty

by my dyno numbers 306/715. I am just straight piped for now with the stock 3 inch and i think that may have caused a problem.
As soon as we started the dyno run Adam noticed black smoke under my hood. I watched the gauges, Egt's were plasma torch hot, and my boost was down to 40 LBS. from 44. The HX-35 stayed together but it did leak exhaust from the ex. housing to manifold flange and where the turbo slips into the ex. housing.
I have never had this problem up until the dyno runs. I heard from some watchers that I had just as much smoke up front as I did out of the tailpipe. Do you think this much fuel and only 3 inch ex. created enough backpressure to leak exhaust out of these areas?
Oh, well I guess I just have to 5" to free some HP before I get a turbo, DARN!!!

Brett

__________________
Brett Lujan Manager of WINspeed Diesel
97 CC 4x4 A/T 3.54's, 180 pump, DDP 4's, Scheid dv's, 4kgsk, #8 Plate,5" exhaust, Bell Turbo WSB, custom n2o.
574 hp 1116 tq
Bell Turbo Dealer
WINspeed Diesel (925-)370-7245

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