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Series I Aftermarket Performance Modifications Discussion of power adding modifications

OBX RX8 Header

Old Nov 8, 2005 | 02:59 PM
  #201  
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Originally Posted by florent75



has you can see on the right I made a mark with a paper pen

you can see I can remove 1 mm with a dremel for exemple ...


anybody have a picture from the stock manihold ??
those ports looked hand carved. I hope that's after you took to it with the dremel.

you could port match the manifold, but you would probably need to add some locating dowels.
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Old Nov 8, 2005 | 03:11 PM
  #202  
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Originally Posted by dDuB
Well I weighed the OBX header already for you that you probably noticed. If no one has done it by the time I'm finally ready to install my full exhaust I'll let you know. This was one of my interests as well, weight savings.

yes, but nobody has posted the factory exhaust manifold weight yet

btw guys, stainless in it's pure form is non-magnetic, but it becomes slightly magnetic when worked, like making tubing, welded, etc. so the magnet test is not considered accurate
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Old Nov 8, 2005 | 03:17 PM
  #203  
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I hate to say it but grinding out that header like that didn't give you anything. Don't guess on how much something can flow by looking at it. Too many people try that and they never get it right. There is nothing you can do outside of the engine to increase flow in the center port. A dremel is also a terrible tool to use when trying to grind on steel. The sanding wheels are fine for finish work but that's the only useful thing about a Dremel on an engine.
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Old Nov 8, 2005 | 03:48 PM
  #204  
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Originally Posted by rotarygod
A dremel is also a terrible tool to use when trying to grind on steel. The sanding wheels are fine for finish work but that's the only useful thing about a Dremel on an engine.
Completely agree... My dremel is only used for cutting small objects or sanding after the grinding/stone work is done.
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Old Nov 8, 2005 | 04:08 PM
  #205  
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sorry

dremel is just an example

but I want to remove the little piece of steel


rotarygood do you think it's no interessant to try to remove the steel ??
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Old Nov 8, 2005 | 04:30 PM
  #206  
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Originally Posted by florent75
anybody have a picture from the stock manihold ??
Need For Speed posted some awhile back:



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Old Nov 8, 2005 | 04:37 PM
  #207  
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I hope everyone is paying attention; remove the 02 sensor BEFORE taking the exhaust manifold off
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Old Nov 8, 2005 | 05:55 PM
  #208  
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nice


exhaust ports same to be bigger on the original ....
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Old Nov 8, 2005 | 06:30 PM
  #209  
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Did SMRX8 ever get his car back?
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Old Nov 8, 2005 | 06:34 PM
  #210  
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Originally Posted by florent75
nice


exhaust ports same to be bigger on the original ....
just remember, bigger is not always better when dealing with port sizes
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Old Nov 8, 2005 | 10:57 PM
  #211  
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Originally Posted by florent75
nice


exhaust ports same to be bigger on the original ....
The exhaust ports on the stock manifold are much larger than they are in the engine. To make matters worse it's only the flange where they are shaped like that. They have round pipes welded to the flange and there isn't a very good transition to that shape. The stock manifold just plain sucks from a design standpoint. Don't look at the size of the runners and try to figure anything out from that. It's worthless.
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Old Nov 9, 2005 | 01:29 AM
  #212  
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sorry rotarygood for my poor english understanding ;

for you

I should try to remove some steel to open the port like the gasket port

or
no interest ??

thanks
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Old Nov 9, 2005 | 02:35 AM
  #213  
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Originally Posted by florent75
sorry rotarygood for my poor english understanding ;

for you

I should try to remove some steel to open the port like the gasket port

or
no interest ??

thanks
Do not gasket match this!!! The gasket hole is enormous! I have no idea why it was made that large. The opening in the stock manifold is smaller and the actual ports in the engine are the smallest.

I just so happen to have an exhaust gasket here I'll overlay on a tracing of the actual engine port size so you can see the actual size difference and why not to match it. Leave the header alone.
Attached Thumbnails OBX RX8 Header-exhaust-comparison.jpg  
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Old Nov 9, 2005 | 05:04 AM
  #214  
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oh yeh ....


thanks a lot

everything is clear with the picture


so my header is nice ...

ports are "dirty" but bigger than necessary ...

so no dremmel

thanks rotarygood
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Old Nov 9, 2005 | 08:08 AM
  #215  
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lol, i like it nice and tight if you know what i mean
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Old Nov 9, 2005 | 12:37 PM
  #216  
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Is anyone else concerned that he hasnt updated us since he got his car back? Did anything happen?

Or maybe he didnt.. I dont know...
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Old Nov 9, 2005 | 12:47 PM
  #217  
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No nothing happened except i blew the nitrous solonoid and had to order one, I figure i will wait to the end and let you guys know the final numbers. but things are looking very good and the ric shaw unit works like a charm.I'm glad i didnt sell it when i had it on the f/s section.Oh and we did get a little more hp out of the computer but hes not done yet.
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Old Nov 9, 2005 | 01:01 PM
  #218  
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Cool! Keep us posted on the final results.
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Old Nov 9, 2005 | 01:11 PM
  #219  
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Sure will , I just didnt want to keep telling you guy one more day
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Old Nov 9, 2005 | 01:25 PM
  #220  
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Sweet! Thankx for the update. I cant wait to hear your impressions about the car after it's fully tuned...
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Old Nov 10, 2005 | 02:05 PM
  #221  
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Originally Posted by smrx8
Oh and we did get a little more hp out of the computer but hes not done yet.

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Old Nov 10, 2005 | 02:13 PM
  #222  
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So, is this header a thumbs up or a thumbs down? Did they say the rise in HP is attributed to the header and not just the tuning alone? I just ordered mine from an SF dealer here. Got it for $250.
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Old Nov 10, 2005 | 02:38 PM
  #223  
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Originally Posted by Xyntax
So, is this header a thumbs up or a thumbs down? Did they say the rise in HP is attributed to the header and not just the tuning alone? I just ordered mine from an SF dealer here. Got it for $250.
Good price
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Old Nov 10, 2005 | 05:32 PM
  #224  
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on ebay you can find it for 249 $ or 289 $ ..


choose your price
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Old Nov 10, 2005 | 11:09 PM
  #225  
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Originally Posted by Xyntax
So, is this header a thumbs up or a thumbs down? Did they say the rise in HP is attributed to the header and not just the tuning alone? I just ordered mine from an SF dealer here. Got it for $250.

cool keep us updated on the install. Are you planning on installing this yourself or at a shop. I would love to come by and check it out. I might purchase this header also, great deal imo.

are you planning on keeping your stock exhaust on with the headers also?
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