Headers for V8 cars, Please read
#91
Lexus Test Driver
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Originally posted by Guru
Holy cow, how much longer? I could have MADE a set while I was waiting for these.
Holy cow, how much longer? I could have MADE a set while I was waiting for these.
#93
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Guru -
I'm assuming that you are well verse at making these headers with your statement. If that is the case, could you go ahead and make a couple for comparison purposes if it's that simple and you have the expertise and tools.
I think we'd all be grateful for some comparisons and competition.
I'm assuming that you are well verse at making these headers with your statement. If that is the case, could you go ahead and make a couple for comparison purposes if it's that simple and you have the expertise and tools.
I think we'd all be grateful for some comparisons and competition.
#94
Lexus Champion
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Originally posted by Guru
Holy cow, how much longer? I could have MADE a set while I was waiting for these.
Holy cow, how much longer? I could have MADE a set while I was waiting for these.
As Dave pointed out there have been several delays in even getting this approved from CL to be offered. I have been working to get this project to market for over 6 months so if anyone should be impatient it should be me. Nobody wants these more than I... that is WHY I have gone to this effort. At one time I had access to fabrication equipment and I built exhaust systems and intercooler systems for my own car as well as friends. I do not currently have that option.
As far as time goes... there are still unanswered questions regarding installation. A set of manifolds would allow a prototype to be built and tested. YES, I did speak to Marken at SRT and unfortunately they do not have any manifolds available. If ANYONE has a line on a set that would be a HUGE help.
DAN... maybe you can help here? Can you get me a set of manifolds? Even if you build you own you will need to remove the stockers. Let me borrow them for a couple weeks. What do you say?
Once we have something to work with, a car and/or manifolds, R&D time is expected at 6 weeks.
BTW, in conversation with the header craftsman I was informed that they have measured up to 12 inches of vacuum in the non firing runners when using a proper merge collector. Contrast this "vacuum cleaner" effect with the "pressurizing effect" the stock manifolds do to the other runners and you get a good idea on how effective these could be.
#95
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Keep up the good work JBrady. I wish I was located out there so I could lend you my car for a couple of weeks to get this going. Have you tried a few dismantling yards for these? I will check around here to see what I can come up with. What other cars have the same manifold? Sc430?LS430?.....
Lee
Lee
#96
Lexus Champion
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Lee,
I have asked a couple of people if they could cross reference the part numbers on the possible cars that could share this manifold. That list is:
98-00 LS400
98-00 GS400
98-00 SC400
01-04 GS430
Other possibilities include:
01-04 LS430
01-04 SC430
Wrecking yards may be a source but they have gotten expensive and usually do not want to sell parts off a usable engine. Check if you have the time but honestly I am not budgeted to buy stock parts for this project.
As far as the fitment list goes, the 92 SC400 needed a different exhaust manifold to fit than what came on the LS400 but I would guess that Lexus would have designed a universal manifold by 1998 since all the above 98-00 cars used the same engine. But, it would be nice to confirm with a part number check if any one has access that would be helpful information.
I have asked a couple of people if they could cross reference the part numbers on the possible cars that could share this manifold. That list is:
98-00 LS400
98-00 GS400
98-00 SC400
01-04 GS430
Other possibilities include:
01-04 LS430
01-04 SC430
Wrecking yards may be a source but they have gotten expensive and usually do not want to sell parts off a usable engine. Check if you have the time but honestly I am not budgeted to buy stock parts for this project.
As far as the fitment list goes, the 92 SC400 needed a different exhaust manifold to fit than what came on the LS400 but I would guess that Lexus would have designed a universal manifold by 1998 since all the above 98-00 cars used the same engine. But, it would be nice to confirm with a part number check if any one has access that would be helpful information.
#97
Lexus Test Driver
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Originally posted by jbrady
As far as the fitment list goes, the 92 SC400 needed a different exhaust manifold to fit than what came on the LS400 but I would guess that Lexus would have designed a universal manifold by 1998 since all the above 98-00 cars used the same engine. But, it would be nice to confirm with a part number check if any one has access that would be helpful information.
As far as the fitment list goes, the 92 SC400 needed a different exhaust manifold to fit than what came on the LS400 but I would guess that Lexus would have designed a universal manifold by 1998 since all the above 98-00 cars used the same engine. But, it would be nice to confirm with a part number check if any one has access that would be helpful information.
#98
Lexus Test Driver
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Originally posted by jbrady
Lee,
I have asked a couple of people if they could cross reference the part numbers on the possible cars that could share this manifold. That list is:
98-00 LS400
98-00 GS400
98-00 SC400
01-04 GS430
Other possibilities include:
01-04 LS430
01-04 SC430
Wrecking yards may be a source but they have gotten expensive and usually do not want to sell parts off a usable engine. Check if you have the time but honestly I am not budgeted to buy stock parts for this project.
As far as the fitment list goes, the 92 SC400 needed a different exhaust manifold to fit than what came on the LS400 but I would guess that Lexus would have designed a universal manifold by 1998 since all the above 98-00 cars used the same engine. But, it would be nice to confirm with a part number check if any one has access that would be helpful information.
Lee,
I have asked a couple of people if they could cross reference the part numbers on the possible cars that could share this manifold. That list is:
98-00 LS400
98-00 GS400
98-00 SC400
01-04 GS430
Other possibilities include:
01-04 LS430
01-04 SC430
Wrecking yards may be a source but they have gotten expensive and usually do not want to sell parts off a usable engine. Check if you have the time but honestly I am not budgeted to buy stock parts for this project.
As far as the fitment list goes, the 92 SC400 needed a different exhaust manifold to fit than what came on the LS400 but I would guess that Lexus would have designed a universal manifold by 1998 since all the above 98-00 cars used the same engine. But, it would be nice to confirm with a part number check if any one has access that would be helpful information.
I'm sure he'll come in and let you know.
#99
Lexus Champion
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Originally posted by jmecbr900
I've spoken to VVT-i and he's gonna start to cross reference the numbers for you with Dealer's parts computer data base.
I'm sure he'll come in and let you know.
I've spoken to VVT-i and he's gonna start to cross reference the numbers for you with Dealer's parts computer data base.
I'm sure he'll come in and let you know.
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#101
Lexus Champion
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I just the part# for all the ex. maniflod list above.
98-00 LS (LH) 17105-50090 and (RH) 17104-50090
98-00 GS400 (LH) 17105-50100 and (RH) 17104-50100
98-00 SC400 (LH) 17105-50110 and (RH) 17104-50110
01-04 LS430,SC430 and GS430 are the same (LH) 17105-50160 and (RH) 17104-50160
For some reason the 98-00 GS has 10 more hp than the LS ( 300 vs 290) by difference header designed. But the 01-04 they're used the same header, but computer tuned the LS to has 10 less hp. I hope this will help the project.
98-00 LS (LH) 17105-50090 and (RH) 17104-50090
98-00 GS400 (LH) 17105-50100 and (RH) 17104-50100
98-00 SC400 (LH) 17105-50110 and (RH) 17104-50110
01-04 LS430,SC430 and GS430 are the same (LH) 17105-50160 and (RH) 17104-50160
For some reason the 98-00 GS has 10 more hp than the LS ( 300 vs 290) by difference header designed. But the 01-04 they're used the same header, but computer tuned the LS to has 10 less hp. I hope this will help the project.
#102
Lexus Champion
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Originally posted by VVT-i
I just the part# for all the ex. maniflod list above.
98-00 LS (LH) 17105-50090 and (RH) 17104-50090
98-00 GS400 (LH) 17105-50100 and (RH) 17104-50100
98-00 SC400 (LH) 17105-50110 and (RH) 17104-50110
01-04 LS430,SC430 and GS430 are the same (LH) 17105-50160 and (RH) 17104-50160
For some reason the 98-00 GS has 10 more hp than the LS ( 300 vs 290) by difference header designed. But the 01-04 they're used the same header, but computer tuned the LS to has 10 less hp. I hope this will help the project.
I just the part# for all the ex. maniflod list above.
98-00 LS (LH) 17105-50090 and (RH) 17104-50090
98-00 GS400 (LH) 17105-50100 and (RH) 17104-50100
98-00 SC400 (LH) 17105-50110 and (RH) 17104-50110
01-04 LS430,SC430 and GS430 are the same (LH) 17105-50160 and (RH) 17104-50160
For some reason the 98-00 GS has 10 more hp than the LS ( 300 vs 290) by difference header designed. But the 01-04 they're used the same header, but computer tuned the LS to has 10 less hp. I hope this will help the project.
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Hmmm... this is curious.
On first glance this looks like they use different manifolds for all these cars... BUT... on second glance I am not so sure. From an engineering standpoint this would be stupid and the Japanese are many things but not stupid.
Oh, regarding the power differences... it is NOT in the exhaust manifold or tuning. It is in the MUCH more restrictive exhaust system of the SC and LS models. In the GS models the dual 50mm (also found on the LS and SC's) join into a 60mm single center resonator and pipe. The LS and SC's have a single 50mm center resonator (less than 2")
![Egads!](https://www.clublexus.com/forums/images/smilies/pat.gif)
Now, back to the manifolds. Notice ALL the left hand manifolds are 17105-50xxx and ALL the right hand manifolds are part number 17104-50xxx. Now, either there are 4 separate designs or for the 98-00 cars Lexus used the part numbers for tracking purposes. Which part needed to be replaced on what car kind of thing.
So, I guess I may try to persuade my local dealer to let me visually check out the various parts (if they even stock them). I believe at the very least they will all have the same flange locations for the heads and catalysts.
#103
Lexus Champion
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The first 5 # is the pre-fixed# and designated to exhaust manifolds and then the last 5 # is the specific # for each car. They may be some differences designed of the manifolds for each car( 98-00 LS, GS, and SC), but the cylinder heads are still the same. I'm not sure about the 430.
I'm sure that the dealer will not stock the exhaust manifold because it's a rare part and we don't have any problem with the exhaust manifold leaks or cracked at all. I will find out about the PN# for the cylinder heads on all car listed above. If they are the same # then the exhaust ports and mounting bolts will be the same.
I'm sure that the dealer will not stock the exhaust manifold because it's a rare part and we don't have any problem with the exhaust manifold leaks or cracked at all. I will find out about the PN# for the cylinder heads on all car listed above. If they are the same # then the exhaust ports and mounting bolts will be the same.
#104
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Originally posted by jbrady
Dan, by all means, if you can make a comparable design that fits in the stock location at the price that we are working with... GO FOR IT.
As Dave pointed out there have been several delays in even getting this approved from CL to be offered. I have been working to get this project to market for over 6 months so if anyone should be impatient it should be me. Nobody wants these more than I... that is WHY I have gone to this effort. At one time I had access to fabrication equipment and I built exhaust systems and intercooler systems for my own car as well as friends. I do not currently have that option.
As far as time goes... there are still unanswered questions regarding installation. A set of manifolds would allow a prototype to be built and tested. YES, I did speak to Marken at SRT and unfortunately they do not have any manifolds available. If ANYONE has a line on a set that would be a HUGE help.
DAN... maybe you can help here? Can you get me a set of manifolds? Even if you build you own you will need to remove the stockers. Let me borrow them for a couple weeks. What do you say?
Once we have something to work with, a car and/or manifolds, R&D time is expected at 6 weeks.
BTW, in conversation with the header craftsman I was informed that they have measured up to 12 inches of vacuum in the non firing runners when using a proper merge collector. Contrast this "vacuum cleaner" effect with the "pressurizing effect" the stock manifolds do to the other runners and you get a good idea on how effective these could be.
Dan, by all means, if you can make a comparable design that fits in the stock location at the price that we are working with... GO FOR IT.
As Dave pointed out there have been several delays in even getting this approved from CL to be offered. I have been working to get this project to market for over 6 months so if anyone should be impatient it should be me. Nobody wants these more than I... that is WHY I have gone to this effort. At one time I had access to fabrication equipment and I built exhaust systems and intercooler systems for my own car as well as friends. I do not currently have that option.
As far as time goes... there are still unanswered questions regarding installation. A set of manifolds would allow a prototype to be built and tested. YES, I did speak to Marken at SRT and unfortunately they do not have any manifolds available. If ANYONE has a line on a set that would be a HUGE help.
DAN... maybe you can help here? Can you get me a set of manifolds? Even if you build you own you will need to remove the stockers. Let me borrow them for a couple weeks. What do you say?
Once we have something to work with, a car and/or manifolds, R&D time is expected at 6 weeks.
BTW, in conversation with the header craftsman I was informed that they have measured up to 12 inches of vacuum in the non firing runners when using a proper merge collector. Contrast this "vacuum cleaner" effect with the "pressurizing effect" the stock manifolds do to the other runners and you get a good idea on how effective these could be.
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