How noisy is your OBS? - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 01-07-2013, 06:26 PM Thread Starter
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How noisy is your OBS?

My rig's been parked since April, and I just started driving it again now that the engine swap is done. In the last couple trips, I noticed it seems REALLY LOUD. I remember being able to hear injector clatter while driving before, and I know the DE 3" DP makes turbo whistle more noticeable, but now the engine and injector noise is such that we have to raise our voices almost to yelling just to hear each other! Forget listening to the radio, it's gotta be cranked all the way to hear it.

While I drove the '97 for a bit this summer, I don't recall it being near as noisy as the '95. It has a carpeted interior while the '95 has the vinyl/rubber floor covering all over, but I don't know what effect that has on noise levels.

How noisy is your OBS? If I wanted to quiet mine (interior-wise; I don't care what people OUTSIDE the truck hear!), what would you recommend?

Nick

1995 F250 XLT 7.3T (on donor '97 engine with 180xxx miles) 4x4 - LuK SMF, Diamond Eye 3" downpipe to 5"straight-pipe exhaust. ZF5 manual trans, Curt hide-away gooseneck hitch, Super Duty suspension conversion.

1997 F250 XLT 7.3T - 2wd E4OD, alloy wheels w/ bald tires, gooseneck hitch, pretty much bone stock. Soon to become a trailer, spare tires, spare parts, and scrap.
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post #2 of 20 Old 01-07-2013, 06:48 PM
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Dynomat the floor and firewall, mine is quiet as hell inside, you can speak softly at highway speed

-Kris-
2000 excursion V10 2wd 230k
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post #3 of 20 Old 01-07-2013, 07:59 PM
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There were two plugs missing in the firewall on my truck, one was for where the slave cylinder comes through and another one for something, that made it way louder inside, maybe they are missing? Just a thought.

My Truck
97' F-250HD. ECLB. 66,000 miles. 7.3. E40D. 6637 Filter. 5" Exhaust. Deleted EBPV. CCV mod. 45 gal. Transferflow Rear Tank. Stock for now. Dana 60 in the works.
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97' F-250HD. ECLB. 18x,xxx miles. 7.3. E40D. 6637 Filter. 4" Exhaust. TW Tunes. Work Truck.
97' F-250HD. ECLB. 150,000 miles. 7.3. E40D. 4" Exhaust. Work Truck.

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post #4 of 20 Old 01-08-2013, 04:59 AM
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Mine has the vinyl floor too. Not much insulation under there, I have to turn the radio up at least halfway before I can ever hear it over the motor.
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post #5 of 20 Old 01-08-2013, 08:15 AM Thread Starter
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Thanks for the feedback. No plugs missing from the firewall; mine has the slave cyl, and all other holes were filled (noted when the engine was out). Guess it's the vinyl floor and lack of insulation... thinking of pulling the carpet and insulation out of the '97 anyway, I can Dynamat it then. That stuff is expensive, but I know there are guys on ebay selling a generic knockoff for less, might try that.

Nick

1995 F250 XLT 7.3T (on donor '97 engine with 180xxx miles) 4x4 - LuK SMF, Diamond Eye 3" downpipe to 5"straight-pipe exhaust. ZF5 manual trans, Curt hide-away gooseneck hitch, Super Duty suspension conversion.

1997 F250 XLT 7.3T - 2wd E4OD, alloy wheels w/ bald tires, gooseneck hitch, pretty much bone stock. Soon to become a trailer, spare tires, spare parts, and scrap.
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post #6 of 20 Old 01-08-2013, 08:21 AM
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my shifter boot is loose on one side, so when I shift into the gears on the pass side, 4th and 5th the truck get about twice as loud lol.

I have vinal floor and ill be honest its pretty loud. I can hear the radio fine though. at like half way up.




1997 F250 7.3 5 speed, 3.55s, D60, 4" Diamond Eye Exhaust, Napa Intake Filter, E-Fuel, 35" bfg mt's, stage 2 rosewoods/tuning, Gauges

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post #7 of 20 Old 01-08-2013, 08:44 AM
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^^^^ +1; damaged shifter boot can let in a LOT of noise.

Our RCLB is vinyl-floored and the ECLB is carpeted, and come to think of it, there is a noticeable difference. Isn't there some generic backing stuff you can get at Home Despot or wherever, that works a lot like Dynamat but is more hardware-store priced, popular for this kind of thing?
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post #8 of 20 Old 01-08-2013, 09:30 AM
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Mine is really quiet... It died last year

Drew
99 SD 6SPD manual

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post #9 of 20 Old 01-08-2013, 09:34 AM
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And make sure that there is plenty of clearance for the down-pipe. I though mine had enough, but, it would barely touch when driving and cause a heck of a noise. Had to massage the firewall a bit more.

'97 F-250, 4x4, Supercab, D60 Swap, Intake, Turbo Back Exhaust, TW 6 pos, IDM Mod, HPX, FS 2500 Oil Bypass, Quadzilla Recon XZT Digital Gauge, RSK w SD springs, 1.0 compressor housing, EBPV delete, modded pedestal, E-fuel with "Tight-wad" regulator mod
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post #10 of 20 Old 01-08-2013, 12:24 PM
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My shifter boot is kinda tough in the 94 I got a insulated shifter cover for a semi that I put over it helps a lot


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94 F-250 reg cab 4x4 5spd 7.3 stroke. 3inch downpipe, 4 in exhaust. super duty turbo with 1.0 non wastegated exhaust housing ww2 and 360 thrust kit. Intercooler, MB diesel hpop, driven diesel complete efuel, 6637 air filter, kingpin dana 60.

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