Sell me your Ott X-over please
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From: Anaheim California
Designing and creating is fun and challenging . Managing production, shipping ,sales is time consuming work. Now that he finally has the stroker short block in hand I think he has better things to do with his time.....
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From: Rochester, WA
Originally Posted by 928ntslow
Anyone know why Louie isn't making the X's anymore?
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I hope I'm not stepping on Louis's toes here, as he has been more than helpful to me at all times, but if he is truly not making them anymore, a cheap alternative (with welding needed - quite a bit) is the cross over at summit racing.
http://store.summitracing.com/defaul...4921571+303028
Or just the basic one that is just the X.
http://store.summitracing.com/defaul...4921571+303028
Or just the basic one that is just the X.
Three Wheelin'
Joined: Mar 2003
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From: New Berlin
Originally Posted by heinrich
Speaking of OT: Paul, was it you that bought that black-on-cancan sunroofless S4 a few years bacK? I was looking at that car and was sooooo tempted .....
I drove down to see it, made an offer, drove back home(..quickly!) and got the cash, turned around and drove back again with a friend to drive it home. Total elapsed time was about 6 hours; it is prudent most times to pounce at an obvious, golden opportunity!
Originally Posted by JE928Sx4
You're off topic.
Three Wheelin'
Joined: Jan 2004
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From: Mosier, Oregon
Ken,
If you mean the outlet pipe spacing, it is 4" to 4.25". It's the same as the dual cat outlet pipe spacing. You need about 4.25" spacing if you are going to use the 4" diameter Random Technology cats to give a little space between the cats. Someone mentioned about iusing a dual in/out muffler in place of the X pipe. Whiole I suppose it would fit in the alloted space, it won't have the extraction properties of the X pipe or properly designed merge collector. Tom Cloutier is making the X pipes (tomasc@pacbell.net) and David Lomas (ketchmi@exolo.com) was working with Dr. Gas to make one too. I haven't heard from Dave recently to know how he's progressing with that effort.
Louie
+++++++++++++++++++++++++++++++++++++++++
Can anyone tell me what the center to center measurement is on the Ott pipe?
Ken
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If you mean the outlet pipe spacing, it is 4" to 4.25". It's the same as the dual cat outlet pipe spacing. You need about 4.25" spacing if you are going to use the 4" diameter Random Technology cats to give a little space between the cats. Someone mentioned about iusing a dual in/out muffler in place of the X pipe. Whiole I suppose it would fit in the alloted space, it won't have the extraction properties of the X pipe or properly designed merge collector. Tom Cloutier is making the X pipes (tomasc@pacbell.net) and David Lomas (ketchmi@exolo.com) was working with Dr. Gas to make one too. I haven't heard from Dave recently to know how he's progressing with that effort.
Louie
+++++++++++++++++++++++++++++++++++++++++
Can anyone tell me what the center to center measurement is on the Ott pipe?
Ken
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From: Bountiful, Utah
Dr. Gas seems to be real busy and keeps putting me back a week at a time. They think they can get another 10 hp & '#'s out of it (I don't think so........) so we are going to do a side by side dyno test before we offer it to the public. Expected date is now around Christmas give or take a week. We will be offering it with and without cats. We are also using Louie's cat back design in a true mandrel bent 2.5" and it will be dyno tested as well. Price is undetermined as of yet but it shouldn't be too bad. More to come!
Dave
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From: Nova Scotia
Originally Posted by FlyingDog
VT928, is that all of their dual in dual out mufflers, or just a certain model?
Only certain models are quoted to be true "X" in configuaration, and of the absorption type. With 2.25" tubes (x4), 14" body,& length @ 20", # 14385 stainless, or #11385 aluminized would seem to be suitable.
As I have a spare gutted cat to play with ( X-pipe opportunity?), this would be close to a 'cut & paste' if the cat were cut just ahead of the 'H' crossover - then attached to GT resonators and muffler - plus sort out an O2 sensor well. ( don't like the idea of sampling one bank only) - how to capture both banks
, back to the drawing board ...
Burning Brakes
Joined: Jan 2002
Posts: 842
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From: Springfield, MO
(Curtis), it appears to me that nobody is willing to come forth and pull heinrich from the depths of despair with an Ott x-pipe, so I think the topic went two directions:
1. Talking about heinrichs resemblance to his avatar because he couldn't remember who he sold his x-pipe too (lol)
2. Discussing potential "X" solutions via Dr. Gas and Magnaflow.
1. Talking about heinrichs resemblance to his avatar because he couldn't remember who he sold his x-pipe too (lol)
2. Discussing potential "X" solutions via Dr. Gas and Magnaflow.
Last edited by JKelly; Dec 17, 2004 at 03:33 PM.
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928 Collector
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From: Seattle
JKelly, very true 
... Curtis, I like to read Psalms also 
So, speaking of OT ... or is that Ott
... I bought two new windshields with antenna retail yesterday. I still can't sit down.
... Curtis, I like to read Psalms also So, speaking of OT ... or is that Ott
... I bought two new windshields with antenna retail yesterday. I still can't sit down.
Three Wheelin'
Joined: Jan 2004
Posts: 1,611
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From: Mosier, Oregon
Garth,
I've done a lot of dyno testing between 2.25" and 2.5" pipe size. On a 32 valve engine, the 2.25" pipe size will cost torque at all engine speeds. I have a comparison between 2.25"/3" and 2.5"/3.5" single pipe system on my web site at http://www.performance928.com/cgi-bi...ss_parent=1125
I also have dyno comparison between 2.25" and 2.5" front section alone and the difference was even more. It was about 10 hp difference on the top if I recall correctly. I should put that up on the web site too.
Don't worry much about having the O2 sensor only sample one side. Remember that at above about 80% throttle opening, the LH is in open loop and the O2 sensor isn't being used. Having the O2 sensor in the hotter & faster moving, exhaust stream of one side close to the manifold makes the sensor operate more quickly and have a better (faster) response at idle and part throttle as compared to the relatively dead flow in the center of the H cross pipe as in the stock cat setup. Unless you have a severely unbalanced fuel injector set, I doubt you'd see any difference.
Louie
I've done a lot of dyno testing between 2.25" and 2.5" pipe size. On a 32 valve engine, the 2.25" pipe size will cost torque at all engine speeds. I have a comparison between 2.25"/3" and 2.5"/3.5" single pipe system on my web site at http://www.performance928.com/cgi-bi...ss_parent=1125
I also have dyno comparison between 2.25" and 2.5" front section alone and the difference was even more. It was about 10 hp difference on the top if I recall correctly. I should put that up on the web site too.
Don't worry much about having the O2 sensor only sample one side. Remember that at above about 80% throttle opening, the LH is in open loop and the O2 sensor isn't being used. Having the O2 sensor in the hotter & faster moving, exhaust stream of one side close to the manifold makes the sensor operate more quickly and have a better (faster) response at idle and part throttle as compared to the relatively dead flow in the center of the H cross pipe as in the stock cat setup. Unless you have a severely unbalanced fuel injector set, I doubt you'd see any difference.
Louie
Originally Posted by Garth S
I spoke to the Magnaflow Tech about the "X" mufflers VT928 mentioned.
Only certain models are quoted to be true "X" in configuaration, and of the absorption type. With 2.25" tubes (x4), 14" body,& length @ 20", # 14385 stainless, or #11385 aluminized would seem to be suitable.
As I have a spare gutted cat to play with ( X-pipe opportunity?), this would be close to a 'cut & paste' if the cat were cut just ahead of the 'H' crossover - then attached to GT resonators and muffler - plus sort out an O2 sensor well. ( don't like the idea of sampling one bank only) - how to capture both banks , back to the drawing board ...
Only certain models are quoted to be true "X" in configuaration, and of the absorption type. With 2.25" tubes (x4), 14" body,& length @ 20", # 14385 stainless, or #11385 aluminized would seem to be suitable.
As I have a spare gutted cat to play with ( X-pipe opportunity?), this would be close to a 'cut & paste' if the cat were cut just ahead of the 'H' crossover - then attached to GT resonators and muffler - plus sort out an O2 sensor well. ( don't like the idea of sampling one bank only) - how to capture both banks
, back to the drawing board ...