muffler test
 

Great news for us last week our system was tested along CMI, and GGB by an independent source. They used a 502 MPI Merc that was supercharged. The test was done in the middle of the lake, so at dockside it will be about 2db louder.
With straight exhaust the boat at idle was 93db, ran 92-93mph, and had a RPM range of 5400-5500. With our system on the boat it tested 86db, ran 92mph, and had an rpm range of 5400. CMI at an idle was 88, ran 91-92mph, and had an rpm range of 5400. With GGB system at an idle it was 88db, ran 92-93mph, and had an rpm range of 5300-5400.

HP Mufflers
 

Dan
Put your mufflers on my Twin Engine Blown cat. Took it out yesterday and tried it, It works great!! Had my 32 pitch props on, took it up to 5700 Rpms using B maxs with 130 ratio and the read out on the gps was 110.9..And that was with 4 people and over half full of fuel. Still dont know if Michigan and wisconsin will except the noise but it should be close. No wake area- great, but dont know about the higher Rpms. I 'll let you know soon.:D :D :D
eliminator219

I am glad that they are working for you. What do you have for power?

I think we have a WINNER with HPI.
I have been very happy with the new sound level and the no loss of performance.

Thanks Dr. Santiago

Also very happy with the Hydros on my HP525. They work great. The sound is a deep rumble, that annoying screech is gone.

They work so well that at the Point Pleasant race last weekend, someone reminded me to take them off for the race. Noise being part of the experience and all that.

Peconic

Glad to hear that you are happy with them.

Ahhm, one further unvoluntary endorsement:

In the wake of an accident a few weeks ago, Suffolk County's Finest have greatly stepped-up their on-water enforcement activities. 3 days ago, I was pulled over for a VERY thorough safety check, down to the cleanliness of the bilge. I was finally written up for not enough space between the "NY" and the number part of the boat number ...

Anyway, he didn't even mention the word noise. His boat was louder than mine.

Peconic

Did you have any power loss after you put our silencers on?

Nothing I could notice. We ran the Point Pleasant race with the mufflers on. We (29 foot Kryptonite, HP525) were in the #3 position behind Augie Pensa in a 38 foot Scarab, followed by the current F1 World Champions Typhoon, Randy Schleuss and Glenn Murray. Typhoon's boat is identical to ours, but no mufflers. We held the position until we had a computer problem in the final laps and had to restart. A big cat took our 3rd place, we came in 4th.

Peconic

I think that is the best info that we ever got about our silencers. Thanks

Nice to see some testing done...Sounds like a good setup..Lots of good feedback. I would like to see a test done with several mufflers not just a couple..I really like my Shotguns. Many people don't realize YOU CAN adjust them...Not to mention different recoil springs are availiable to adjust even more....A good test with Torque,HP,Speed and Cost would be awesome.....

BH

Too Old, you forgot: "Was that on the db-A scale or the db-C scale?"

This reminds me of what happens in my business when someone comes across a survey which he doesn't like: "Who did the survey? Was it representative? What was the sample size? Postal or telephone?"

The most important message these numbers send is:

- There are mufflers that do not impact performance.
- They provide a considerable reduction in noise, in this instance, from 93dB to 86-88 dB.

Note: dBs have a logarithmic scale. Increasing a sound intensity by a factor of 10 raises its level by 10 dB; increasing it by a factor of 100 raises its level by 20 dB and so forth.

For our application, two items are important:

- What is the dB reading, stationary at idle (because that's what the ever so popular SAE J-2005 requires) ?

- Does the muffler impact performance (because this is what we can't stand) ?

I am not knocking the product, in fact it sounds like those are good results Hydro-Power. However, the information as presented here seems very sketchy. I agree with Too Old, more info is needed. I would also be curious how they stack-up against some other products on the market.

The testing was done by professionals that know the standards inside and out.
In terms of other products, 2 weeks ago we got a call from Eliminator Boats. They were referred to us by Mercury, who has tested every silencing system on the market today . Also CMI who has a competitive product to ours has also sent us business because we are the only silencer on the market that can handle big power without loosing HP's.
I don't understand why we are getting such a hard time about our products. Look the best powerboat company's in the world like Cig, Outerlimets, Eliminator, just to name a few use or system because it is the best. We all know how expensive our system is, so for the OEM's to buy a system that is twice as expensive as any thing else says a lot about what we are doing.

How about a special end of the season group OSO special discount!!

Here is what we will do. I will start a new thread offering a 20% disc on the entire product line till Aug 30.

The test was done by Livorsi. It was conducted in the afternoon. The speeds were registered with a gps. I don't have an answer on what type of equipment that he used.

Do you have Pn#s of the products used?

HP, I don't know much about your muffler system, and I am not trying to be difficult here---just curious, but I was wondering if you could please answer a few questions---

1) Is it an on/off system or a full time system that is a permanent installation?

2) If it's not a permanent installation, do they install something like the Shotgun type mufflers?

3) If it is not a full time system, and your mufflers are in the "open" mode, can you tell me what the difference is in db's between a straight open, dry exhaust system (no mufflers attached to tailpipes at all) compared to your muffler attached to the tailpipes in the "open" mode on the same test engines/boat? In other words, do your mufflers still quiet down the engines even when they are in the "open" mode and if so, what is the difference in db's please?

Do you have a website w/pictures?

Thanks :)
Mark/KAAMA

KAAMA
Our silencers are full time. We don't make a switchable exhaust. We do offer a clamp-on set up that clamps to your tip or tail pipe. Check out our web site, that should answer all of your questions.
www.hpisilencers.com

Thanks

hOW MUCH ARE THE 9060pr?

Retail is $920/pr. With the discount they are $736/pr plus freight.

Turbo chargers will reduce the noise and gain HP
Tom Earhart

Eliminator 219 are you going to be at Hardy this year?
Tom Earhart

muffler test
 

I am very interested in seeing any test results of the mufflers while at RPM and not just idle speed. I didn't see anything whatsoever about noise levels underway. Why is that ? I see the performance results at RPM but no sound level measurements of the same conditions.

Am I the only one interested in the noise level while underway ?

The reason is that most tests are conducted at idle. Therefore, it's the db reading at idle that is the most critical.

mufflers
 

Hey Cord. I certainly understand that view. But, I am still interested in running without the noise sometimes. I've run loud boats for twenty-five years and sometimes I want to cruise with less noise. From what I read and hear, some manufacturers are installing full time mufflers straight from the factory. I just simply would like to know what the noise levels are at cruising speeds relative to non-muffler systems. It seems totally logical to me that some manufacturer has that info.

And further, some areas are now calling switchable mufflers inadequate and are writing citations. Many areas are now becoming concerned with more than just "idle" noise. Oshkosh, Wis is one area where they are cracking down. They are not just concerned with noise @ idle. Idle is not the only concern here in Tennessee either.

I hope some manufacturer will answer my question about cruise speed decibels. How about it HPI or CMI.

deboatman

With our system it takes a lot of the noise out of the cockpit. Our one customer Dr. Santiago had to have ear plugs in when he was driving his boat. After he put our system on he quite having to put them in and he could talk to the other people on the boat when it was under power.
I hope that this answers your question.

Dan

HPI, I'm in. You have PM. Thank you Marty.

Hardy Dam Run/Tom Earhart
 

Tom
I was there last year and had a great time and met a ton of great people. However, this year I am planning on doing the cops run from Chicago to Michigan City and Hanging out with the people in that run.
Was sort of planning on seeing you and some of the other go fast rockets at the end of the year runs down on the Ohio River if they have them this year..
Please keep me advised if you hear anything on the runs, I beleive you were there last year.:D :D
eliminator219

Dan,
When the test was performed, did the CMI units have switchable "flaps" or were they full time clamp-ons? If switchable, were they flipped shut?
Dave

KiloKat

They are the full time non-switchable mufflers.

Cobra marty

Thanks for the order. Send us a pic of your boat and we will put it on our web site.

Thanks
Dan