Vette Tech Tri-Y Status?
Drifting
Joined: Jan 2001
Posts: 1,408
Likes: 13
From: Dayton, Ohio
Now I understand what you're getting at. You're the 1st to ask about the welds vs. configuration of the expander. I agree with you, If the expander was integral w/ the collector with the welds after, in the 3" section, it might flow better. But I'll bet it's never occurred to the builder of these headers either. That's a good idea as the collector would open up into the expander and then the flange would then be 3" to match up to a 3" exhaust.
You are also correct in thinking the weld may be a little over done. As I said in one of the previous posts, I may decide to take a die grinder and hi-temp paint to the weld to knock it down and smoooooth it out.
You are also correct in thinking the weld may be a little over done. As I said in one of the previous posts, I may decide to take a die grinder and hi-temp paint to the weld to knock it down and smoooooth it out.
Last edited by Yguy; May 20, 2008 at 03:00 AM.
Instructor
Joined: Mar 2003
Posts: 182
Likes: 3
From: Phoenix AZ
Now I understand what you're getting at. You're the 1st to ask about the welds vs. configuration of the expander. I agree with you, If the expander was integral w/ the collector with the welds after, in the 3" section, it might flow better. But I'll bet it's never occurred to the builder of these headers either. That's a good idea as the collector would open up into the expander and then the flange would then be 3" to match up to a 3" exhaust.
You are also correct in thinking the weld may be a little over done. As I said in one of the previous posts, I may decide to take a die grinder and hi-temp paint to the weld to knock it down and smoooooth it out.
You are also correct in thinking the weld may be a little over done. As I said in one of the previous posts, I may decide to take a die grinder and hi-temp paint to the weld to knock it down and smoooooth it out.
obviously the link vs the vete tech is not even a reasonable comparison, however worth a look
look at the expander in the link
i cant for the life of me figure why vette tech would put the flange before the collector opens up to 3inch
http://www.popularhotrodding.com/tec.../photo_10.html
Drifting
Joined: Jan 2001
Posts: 1,408
Likes: 13
From: Dayton, Ohio
I think I understand how you feel, but one option would be to buy them uncoated, and when you get them, remove the 3-bolt junction of the collector/expander and have them welded the way you want them. I don't think I'd ask Brian to make them that way, 'cause he ain't Burger King and special orders DO upset things. I think one reason it took so long to get mine is the smog hookups. He told me most all that he sells
go out w/out the smog parts. When I told him I wanted them, he told me it'd be an "extra day or so".
go out w/out the smog parts. When I told him I wanted them, he told me it'd be an "extra day or so".
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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Check how the 1 3/4" headers are made.
Last edited by GREGGPENN; May 21, 2008 at 01:49 AM.
Race Director
Joined: Jan 2008
Posts: 16,027
Likes: 170
From: oregon
people normally step up the size in 4-2-1 over in the 4cyl world where this design is beyond popular. in other words a 1-5/8" 4-1 header would be tested against a 4-2-1 design in 1-3/4" the increase in torque you gain allows the increase in tubing which of course promotes the top end HP. There are pretty large differences on your typical 100hp per litre daily driving 4 banger depending on tubing length, size and shape. we really need to see a few of these used on various levels of motor and tested against a baseline like headman or hooker in order to really say what this header will do. till then it's all bench racing.
Drifting
Joined: Jan 2001
Posts: 1,408
Likes: 13
From: Dayton, Ohio
http://www.jegs.com/p/Flowmaster/744771/10002/-1
They drop back down to 2-1/2" gradually.
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Safety Car
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From: Salem NH
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Racer
Joined: Mar 2003
Posts: 346
Likes: 33
From: OKC OK
I called Brian weeks ago to see if he would sell them uncoated & was told NO. I wanted to add 02 bungs for my Innovate box and make the headers a slip fit not flanged end. If someone knows where to buy these uncoated, hows about posting that info, I'm interested.
Drifting
Joined: Jan 2001
Posts: 1,408
Likes: 13
From: Dayton, Ohio
You learn something new everyday. When I bought mine I opted for the coating even tho it'd take, "an extra few days".
Race Director
Joined: Nov 2003
Posts: 12,220
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From: Overland Park Kansas
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IOW are you sure it was a global reply?
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Maybe the no was based on his inability to retrieve a set already sent for coating. Hey, if he's communicating honestly, it took nearly 2 mos for the headers to get thru the coating house. Maybe he would have "lost his place in line"....
Your reply above should provide extra incentive for him to ask again!
gp
Racer
Joined: Mar 2003
Posts: 346
Likes: 33
From: OKC OK
GP, No I had called way back in late Feb early March timeframe. Brian told me he doesn't sell them uncoated. I wasn't looking to get them cheaper, just trying to get a product that I could make some mods to w/o the coating causing issues w/welding extra bungs on. I also prefer a different coating mfg than JetHot, it's a personal experience issue.
Drifting
Joined: Jan 2001
Posts: 1,408
Likes: 13
From: Dayton, Ohio
Well guys, I started the install last night. After I removed the front Y, I took out the driver side manifold. Easy enough. I grabbed the appropriate header and began the attempt from under the car. With my car resting on it's wheels 10-1/2" up, I quickly found I was too low. I put the jack under the front and got about 4 or 5 more inches. Still too tight. Height was no longer the problem. Then it hit me, try from the top. It worked. You need to remove the upper steering sector shaft, but with a little coaxing, it slid right in. BTW, you'll also need to temporarily remove the curved brake line heat shield(along the frame). It comes out with two 10mm screws and goes back in easier than I thought it would. That's all for now, it looks like I'm gonna have to rotate my oil cooler adapter towards the block a little so the rubber water lines won't be in contact w/ the header.
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
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Thread Starter
Pro
Joined: May 2000
Posts: 529
Likes: 0
From: Bellevue NE
I received mine yesterday as well. Nice looking pieces, I was considering cutting off the three bolt flange in order to convert them to a slip fit connection but decided otherwise; just need to find a decent set of gaskets. Any recommendations? All welds looked very good, other than the joy of installation I think these will work very well in my set-up. I dropped them off the same day at my powder-coater, I want mine black.