Please excuse the length of this post, but we are seriously searching for your “informed opinion” on a complex question. This post is
NOT an effort to sell you any product! We appreciate and respect the user guidelines of TDR. We intend to become a TRD Sponsor in the very near future (weeks not months) and will reserve our shameless commercial plugs for that time. Now we just want your honest input into a question that has become very confusing for us. We are posting this question on several other diesel forums and, in as much as High Performance Modifications seem to have begun in the community of Dodge diesel owners, we felt like your opinions should be given proper consideration.
Our company name is
Street Pro and you may need to look at our web site to understand the product we are talking about. If you don’t need to look at the site, great, if you do, the site is
www.streetpro.us Let me say once again “
we are not trying to sell you any product through this post”. We just want your
honest input to the following questions.
We at
Street Pro need some advice on interpreting dyno results. Here is the background that has lead us to this state of confusion.
We started our company almost 2 years ago with the sole mission to make exhaust cutouts for the gas engine guys. We developed what we think is the best looking and performing (not cheapest) cutout on the market. Upon testing several cars and trucks (gas) we saw a consistent 5-6% increase in both torque and hp at the rear wheels regardless of the baseline power, open vs closed. Everybody loved it and away we went. Hundreds are in daily use today. Then a few months back we were told by several shops and people using diesel trucks to pull gas racecars that our real market for this product was in the light duty diesel, which we knew nothing about. Believing that
a “less restrictive” exhaust system is a good thing in any turbocharged engine application, we set out to create the big brother diesel exhaust cutout that we now call the 4" Power Master.
Like the gas 3" cutout, we wanted to test the product and see what was really being gained in terms of power. We believed “real world” over the road performance was the true test of the product but we knew that many people like to quote Dyno numbers. We secured a DuraMax that has an Edge Attitude 5 stage chip and stock exhaust (no cat model). The first dyno test was done with the results being inconclusive. The dyno shop said their dyno (an older model) could not test at such low RPM / high torque. So we then went to a very large local Caterpillar shop that has an over the road truck dyno. I must say the test was unlike anything we had ever seen in that the truck was allowed to run at full load for what seemed to be
2 - 3 minutes per pull (glad it wasn’t my truck!). The tests were done with the cutout open vs closed with the chip set at level 3 (90 hp ???). After a lengthy head scratch session, the senior dyno operator reported to us - 257 rwhp closed and 289 rwhp open and an EGT drop of ~ 100 degrees in the open position.
Since that time, a member of another diesel forum (primarily DuraMax) was given a unit to test to help validate the numbers and he got a VERY different result. His truck is equipped with a Banks Six Gun (hp ??) and a Banks Monster Exhaust (with cat). With our part installed after his cat, his test indicated only 4 rwhp improvement.
On another truck tested at Garmons Diesel Performance in McDonough, GA last weekend we saw a 4 rwhp gain on a stock '04 Dodge by using the cutout to bypass the muffler.
The Dyno test on both the Dodge and the DuraMax seemed to allow the engine to run at maximum throttle for
10 to 15 seconds as opposed to the almost brutal
2 to 3 minutes we observed at the Caterpillar dealers facility.
A respected individual in the light duty diesel performance business tells us that the cutout when used to bypass the cat
and muffler should yield 10 to 12 rwhp improvement when tested in the “short burst” type of test.
The obvious questions: Why did the DuraMax at the Cat dealer show such a strong gain and the other 2 were so low in comparison ?? What is the “real world” application of this information? Any help would be appreciated so we can properly understand the true benefits offered by our product in the diesel marketplace.
Thanks for you opinions. We’ll see you again soon as a TDR Sponsor!
Street Pro
www.streetpro.us
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