Stainless Steel Header for the S Type V-8?
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#205
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I spoke with Chris of Mina Galleries. He owns Jags and knows the STR and XJ's upside down. He describes the STR's exhaust manifolds as small, low restriction, and down sloping. He feels headers are not a cost effective power builder on the STR. He does strongly suggest hi-flow cats and thereafter as necessary for build-ups. Magnaflow hi-flow cats go on Tuesday.
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#208
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That's what's so interesting. The engine compartments and mounting points were identical when the Lincoln LS and the S Type came out. Look at this diagram showing what the cars shared. Everything is there but it would just take something small to make them not fit.
I want to get a set and then if they don't fit the STR I could put them on the wife's LS!!!
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I want to get a set and then if they don't fit the STR I could put them on the wife's LS!!!
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![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
#209
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so i ended up selling these headers two days after getting them because a turbo deal was offered to me and these headers couldn't be used with it. The guy I sold them to traded his ls before installing so now he's selling them too. Anybody interested int hem? He's also selling aftermarket rims he took off his ls, so they'll fit your jag's too.
The lincoln thread
http://www.lincolnvscadillac.com/showthread.php?t=70986
His email
candyapplered321@gmail.com
The lincoln thread
http://www.lincolnvscadillac.com/showthread.php?t=70986
His email
candyapplered321@gmail.com
#211
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I'd give it a shot if I had an STR, but I'm two cylinders and a supercharger short for now
![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
George
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#213
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That's the big question. Will they add any power? As far as fit the EGR tube is definitely needing modification. The Jag has the connection up high and the headers have it down closer to the collector. Looks like the same flange connection but in a different place. The header does come with an extension for the EGR but I don't know why?
If they are stainless steel do you still need to coat them?
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![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7168d1294370923-stainless-steel-header-s-type-v-8-2003-s-type-r-engine-exhaust-manifold-right-inside.jpg)
If they are stainless steel do you still need to coat them?
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![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7168d1294370923-stainless-steel-header-s-type-v-8-2003-s-type-r-engine-exhaust-manifold-right-inside.jpg)
![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7169d1294370923-stainless-steel-header-s-type-v-8-headers-stainless-works-headers-lincolnls-thunderbird.jpg)
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mystype04 (01-06-2011)
#214
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If that's what the stock exhaust manifold looks like, I guarantee those headers would be a horsepower gain. The long separate tubes prevents exhaust gas pressure waves from being pulled back into ajacent cylinders when the exhaust valve opens.
If they fit an STR, I'd cut off that small collector and weld a reverse taper megaphone in place to help scavaging too.
If they fit an STR, I'd cut off that small collector and weld a reverse taper megaphone in place to help scavaging too.
#215
![Wink](https://www.jaguarforums.com/forum/images/icons/icon12.gif)
That's the big question. Will they add any power? As far as fit the EGR tube is definitely needing modification. The Jag has the connection up high and the headers have it down closer to the collector. Looks like the same flange connection but in a different place. The header does come with an extension for the EGR but I don't know why?
If they are stainless steel do you still need to coat them?
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![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7168d1294370923-stainless-steel-header-s-type-v-8-2003-s-type-r-engine-exhaust-manifold-right-inside.jpg)
![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7169d1294370923-stainless-steel-header-s-type-v-8-headers-stainless-works-headers-lincolnls-thunderbird.jpg)
If they are stainless steel do you still need to coat them?
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![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7168d1294370923-stainless-steel-header-s-type-v-8-2003-s-type-r-engine-exhaust-manifold-right-inside.jpg)
![](https://www.jaguarforums.com/forum/attachments/s-type-s-type-r-supercharged-v8-x200-15/7169d1294370923-stainless-steel-header-s-type-v-8-headers-stainless-works-headers-lincolnls-thunderbird.jpg)
First of all, the extension is made to connect the EGR, where is suppose to be, closer to the top much like the factory manifold showed in your picture. Second the coating is mainly to keep the excessive "heat" out. Our car like all the cars today have knock sensors, so if the engine was to get too hot the computer will sense it, and retard the timing... This is to save the engine from detonating, which is absolutely bad. The good part is that this will save your engine, but the down side is this will cut the power too. So having in a long tube set headers will increase your power but as heat build up inside the engine bay your ECU will cut back the power. So what’s gain is lost too.
From my personal experience in my Northstar Fiero, by replacing the stock headers with "long tube" (31inches), made me 30hp average across the power band. Definitely good. But the N* is a NA engine, my best guess is that a Boosted engine like the one in our STR’s will gain this much, but is more likely it will be more than a NA engine with similar size. I will not be surprise if a 40Hp showed in a Dyno graph! =)
As a side note I've called https://www.byunspeed.com/login.php like 3 times today, and I just keep getting their answer machine. So I'm about to give up. I really wanted to get them but I’m running out of time, and my biggest concern is the sound it will make, it will probably sound like a Ford Mustang Cobra, but it looks like a little Rolls??? Is a tough call, but definitely the place to look for power in our cars, since our SC are so inefficient. A free flowing CAT and muffler can only do so much, the real bottle neck will always be the exhaust manifold.
Last edited by mystype04; 01-06-2011 at 11:08 PM.
#216
![Default](/forum/images/icons/icon1.gif)
From my personal experience in my Northstar Fiero, by replacing the stock headers with "long tube" (31inches), made me 30hp average across the power band. Definitely good. But the N* is a NA engine, my best guess is that a Boosted engine like the one in our STR’s will gain this much, but is more likely it will be more than a NA engine with similar size. I will not be surprise if a 40Hp showed in a Dyno graph! =)[/FONT][/COLOR]
As a side note I've called https://www.byunspeed.com/login.php like 3 times today, and I just keep getting their answer machine. So I'm about to give up. I really wanted to get them but I’m running out of time, and my biggest concern is the sound it will make, it will probably sound like a Ford Cobra, but it looks like a little rolls??? Is a tough call, definitely the place to look for power in our cars, since our SC are so inefficient. A free flowing CAT and muffler can only do so much, the real bottle neck will always be the exhaust manifold.
As a side note I've called https://www.byunspeed.com/login.php like 3 times today, and I just keep getting their answer machine. So I'm about to give up. I really wanted to get them but I’m running out of time, and my biggest concern is the sound it will make, it will probably sound like a Ford Cobra, but it looks like a little rolls??? Is a tough call, definitely the place to look for power in our cars, since our SC are so inefficient. A free flowing CAT and muffler can only do so much, the real bottle neck will always be the exhaust manifold.
I'm getting ready to do some flow bench R&D on Ferrari heads for a twin turbo godzilla engine combination that nobody has ever done before. We'll be putting 90% of our efforts towards exhaust flow.
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