URGE Scavenger System Launch;
07-11-2015, 06:50 PM
#12
Sponsor
Thread Starter
07-12-2015, 01:21 AM
#13
Registered User
Join Date: Jul 2014
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
1. I noticed the STR version of the midpipe does not expand as big as the Urge version. Is this because it does not have sound baffling? Any pros and cons given this design permutation?
2. Do you have dyno numbers of the STR version to compare with stock, test pipe, and Urge version midpipe?
3. Can we get a picture of the STR midpipe side-by-side with the stock midpipe so we can interpret whether the STR rule is fulfilled?
You guys are doing some awesome work here! Tne s2k community definitely appreciates it!
Thanks,
-Michael
07-12-2015, 04:18 AM
#15
Sponsor
Thread Starter
Originally Posted by Urge' timestamp='1436669420' post='23677747
[quote name='sillyboybmxer' timestamp='1436668693' post='23677740']
i think any one concerned with the dB reading is going to be using the STR version and a single exit.
A fly by at 75ft at the top of 2nd gear measured at 75ft please
i think any one concerned with the dB reading is going to be using the STR version and a single exit.
A fly by at 75ft at the top of 2nd gear measured at 75ft please
1. I noticed the STR version of the midpipe does not expand as big as the Urge version. Is this because it does not have sound baffling? Any pros and cons given this design permutation?
2. Do you have dyno numbers of the STR version to compare with stock, test pipe, and Urge version midpipe?
3. Can we get a picture of the STR midpipe side-by-side with the stock midpipe so we can interpret whether the STR rule is fulfilled?
You guys are doing some awesome work here! Tne s2k community definitely appreciates it!
Thanks,
-Michael
[/quote]
1. Yes it is the reason why we could not fit sound baffling. The reason why it doesn't expand as much is that the cone has to be much longer to meet the STR rules to be with in 6" of the OEM cat. We brought it with in 5". If the STR was the same width it would contact the body.
2. I don have a dyno chart, I can see if Gernby can dig one up. But it does make the same power. Ill see if he can do some back to backs with each pipe. He made a few STRs in his original run and they did make the same power.
3. We can work on that picture as well.
Thank you..
Gernby has plenty of videos from his original run. We will find some links..
__________________
07-12-2015, 05:35 AM
#16
The dyno results of this pipe have always been quite impressive.
I do not see a cat in the STR pipe. Where is it?
The STR rules try to define what a "cat" is- is it the pipe containing the cat, the catalytic material, or the expansion chambers containing the cat.
"The extents of an OE converter are defined by the expansion
chamber in which the catalyst is contained, regardless of placement
within larger exhaust sections"
That, to me, would be where the cat pipe tapers into a standard diameter (within 6" of the OEM O2 bung location would be a good rule of thumb). People discussed building a 3' long expansion chamber with the cat at the end but that isn't what the rule intends to allow. The intention is to allow moving the core of the cat downstream no more than 6".
Food for thought.
I do not see a cat in the STR pipe. Where is it?
The STR rules try to define what a "cat" is- is it the pipe containing the cat, the catalytic material, or the expansion chambers containing the cat.
"The extents of an OE converter are defined by the expansion
chamber in which the catalyst is contained, regardless of placement
within larger exhaust sections"
That, to me, would be where the cat pipe tapers into a standard diameter (within 6" of the OEM O2 bung location would be a good rule of thumb). People discussed building a 3' long expansion chamber with the cat at the end but that isn't what the rule intends to allow. The intention is to allow moving the core of the cat downstream no more than 6".
Food for thought.
07-12-2015, 06:01 AM
#17
The dyno results of this pipe have always been quite impressive.
I do not see a cat in the STR pipe. Where is it?
The STR rules try to define what a "cat" is- is it the pipe containing the cat, the catalytic material, or the expansion chambers containing the cat.
"The extents of an OE converter are defined by the expansion
chamber in which the catalyst is contained, regardless of placement
within larger exhaust sections"
That, to me, would be where the cat pipe tapers into a standard diameter (within 6" of the OEM O2 bung location would be a good rule of thumb). People discussed building a 3' long expansion chamber with the cat at the end but that isn't what the rule intends to allow. The intention is to allow moving the core of the cat downstream no more than 6".
Food for thought.
I do not see a cat in the STR pipe. Where is it?
The STR rules try to define what a "cat" is- is it the pipe containing the cat, the catalytic material, or the expansion chambers containing the cat.
"The extents of an OE converter are defined by the expansion
chamber in which the catalyst is contained, regardless of placement
within larger exhaust sections"
That, to me, would be where the cat pipe tapers into a standard diameter (within 6" of the OEM O2 bung location would be a good rule of thumb). People discussed building a 3' long expansion chamber with the cat at the end but that isn't what the rule intends to allow. The intention is to allow moving the core of the cat downstream no more than 6".
Food for thought.
In regards to the location of non-OE catalytic converters the STAC considers the inlet to be the location where the expansion chamber begins. Additionally, there are currently no restrictions as to where the catalyst medium may be located within the assembly
07-12-2015, 06:14 AM
#18
A quote from the September 2014 fastrack in response to letter #14037:
This clarification pretty explicitly spells out that as long as the expansion chamber begins within (from the rule book) "within 6” (152.4 mm) of the original unit." the catalyst medium can be located anywhere within the assembly.
In regards to the location of non-OE catalytic converters the STAC considers the inlet to be the location where the expansion chamber begins. Additionally, there are currently no restrictions as to where the catalyst medium may be located within the assembly
07-12-2015, 07:25 AM
#20
Sponsor
Thread Starter
The cat is in the section behind the rear tie bar.
[attachment=82201:Connector Bottom.JPG]
There is no hanger on the Mid Pipe, it is much lighter than the OEM cat and mid section. Gernby never had a hanger on his original 50 units he sold. So we didnt either.
__________________
