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post #1 of 8 Old 09-15-2013, 12:39 PM Thread Starter
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Backpressure question

So i just put in a diy tymar and a 4" mbrp exhaust and im getting a wooshing sound from the engine when i lift off the pedal ir the tranny slips intk overdrive. Is this normal? Is it just backpressure noise?
Thanks for any clarification
Kevin

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post #2 of 8 Old 09-15-2013, 12:59 PM
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this is the sound of air going back out of the intake.
this is normal, you didnt hear it before because the stock intake is enclosed, but since its open you can hear it now.

99.5 f250 7.3 4x4 258k
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post #3 of 8 Old 09-15-2013, 01:06 PM Thread Starter
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Great. Thats what i assumed but just wanted to be sure. Thanks for the reply.

2002 F350 CCSB SRW 4X4 ~110k
4" MBRP, DIY Tymar, PHP hydra, Edge Insight CTS, 360* thrust, RR billet wheel, delete pedestal and outlet,
Napa ELC, melling 208 Lpop, 6.0 trans cooler, diy coolant filter, 203* thermostat, RR IC boots w/ plenum inserts, frx, hpx, hutch&harpoon
331 hp / 620 tq
Dynod by dynoproven 4/19/14

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post #4 of 8 Old 09-15-2013, 03:56 PM
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anytime.

99.5 f250 7.3 4x4 258k
PHP Phoenix, S&B CAI, 4" TBE, Hpx, Stancor, RR Billet Wheel, AIH Delete, Autometer Gauges, Leveling kit, Transgo kit, Warn Hubs, Int'l Up-Pipes, RR IC Boots, Non-Ebpv Pedestal, High Flow Outlet, RR OCR, 08 Tow Mirrors.

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post #5 of 8 Old 09-16-2013, 06:49 AM
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Quote:
Originally Posted by blue99stroker View Post
this is the sound of air going back out of the intake.
this is normal, you didnt hear it before because the stock intake is enclosed, but since its open you can hear it now.
Bingo!!! You simply never heard it before. Relax and enjoy!!!

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post #6 of 8 Old 09-16-2013, 07:35 AM
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You didn't get a hardon when you first heard that noise? I know I did.
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post #7 of 8 Old 09-16-2013, 08:22 AM
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Originally Posted by zillafreak View Post
You didn't get a hardon when you first heard that noise? I know I did.
+2 LOL.....

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post #8 of 8 Old 09-16-2013, 08:34 AM
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You know how hard it is to not floor it all the time to just hear that noise. I would do it if my CC wasn't like, ****, need more fuel.
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