Did some work on this thing today. My guard dog wasn’t up to the task.
But I fixed some electrical gremlins which was due to bad grounds. That fixed flickering lights and bag EGT readings.
Then I messed with the exhaust brake. I took the whole thing off entirely and now realize there is just no saving this exhaust brake. I can’t get it to move much at all and it’s just a lost cause I believe. Bad things is the exhaust valve alone is nearly $1200.
I did take it for a test drive with the muffler off. I didn’t hate it, and it dropped the EGTs a bit. I think it would be tolerable if I just straight piped it and it exited further back behind the cab. But I may put a muffler on it, I’m undecided. I just know with the weight I will be carrying I really want the exhaust brake to work. View attachment 378545View attachment 378546
And we all hated you when you drove by too!absolutely HATED driving it.
3", x-piped, one chamber Flows with dumps.For those that like the bark of a "free flowing" exhaust, but can't stand the DRONE...
Once upon a time, had Fox body 5.0L GT "deleted" with Bassani Race-X & Mac's flowmaster 40 clones that droned so badly on the highway (at 1900-2100rpm), you couldn't hear *anything else*... absolutely HATED driving it.
Used a formula (cylinder count/"V" degree of separation/drone RPM) found on the Corral, had my exhaust artisan replicate these "1/4 wave tubes" for the RPM range... DIVINE!
ZERO drone and was so quiet inside, it made numerous other issues (rattles/suspension wear/etc.) painfully obvious...
I'd bet there's even a formula for Isuzu diesels
Since that's a private forum....you may want to post the pics he has in the first few replies. For science
Well, add ME to list of 100% satisfied folks! Had a bud add a couple of 25" tubes to the mid-pipes today... TOTALLY squelched the 2000rpm drone that was making me crazy!
While it doesn't sound stock quiet, ALL the sound comes out the back. NO drone, NO resonance, NO nothing! So quiet inside, I can hear the fuelpump whine (may be next on list) and am able to make calls using the stereos BT connection... and folks on the other end can HEAR me, instead of "what's that noise?" or "WTH are you at?"
Those pics are the implementation (perception?) on my '91 "Mullet GT" back in Dec. 2013... my "30+ years in the exhaust biz" artisan was floored by the results.So basically they made air chambers (arrestors) to absorb the "hammer"
This is some of that by golly "science of metals" stuff here.Those pics are the implementation (perception?) on my '91 "Mullet GT" back in Dec. 2013... my "30+ years in the exhaust biz" artisan was floored by the results.
From that day forward, my ability to tolerate drone went to -100, given the simplicity and the millions of testimonials.
The spreadsheet (for ciphering the filter length
But, you're correct about it being "science" because the Interwebs said so
The air would always want to flow in the path of least resistance. Initially the pressure would fill the pipe, but since it isnt inline in the exhaust, it shouldnt restrict flow much, if at all. The resonator is basically creating an opposing sound wave to cancel out the frequency of the drone.
It may be similar to an exhaust cutout. Below, black is open headers, blue is w/ stock exhaust, red is w/ a capped cutout. This was on a 598BBC
My assumption was/is it doesn't do diddly for "performance"... BUT being able to talk (vs scream), not having your teeth resonate at the same drone freqs, or your vision blurring was definitely a plus
I don't think there's anything wrong with your fan clutch, btw.