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Old 10-26-2010, 10:42 PM   #1
02 Scoob-TN
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Lightbulb Twinscroll downpipe option..

I finally took the plunge, going to make a nice flowing downpipe for my ver. 8 twinscroll swap. Just recieved my vf37 fitment downpipe elbow($155) from Kinugawa. Nice stainless, like how its a solid piece made by wax mold process. Ordered off ebay (search for vf37 elbow) came in 5 days. Still waiting on an ebay stainless 3in downpipe($70) that Im going to cut the head off of. Going to measure in place cut and tig together. Ill post more pics once Im done. Also posting pictures of the elbow for reference. Notice the shot with the gasket for reference. No big deal just gonna use a grinder to port match it to the gasket. Nice easy option for less than $280..





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Old 10-27-2010, 05:49 PM   #2
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wow...that looks very quality, much better than in the ebay pics.
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Old 10-28-2010, 10:39 AM   #3
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Wow indeed, that is a beautiful piece....
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Old 10-28-2010, 11:46 AM   #4
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ok so i looked up some carbide burs that you'd need to gasket match that and they are expensive!!! like 25-35 dollars a bur. Am i missing something?
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Old 10-28-2010, 02:28 PM   #5
02 Scoob-TN
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Rally Stuff

Yeah Ive already got a set. I bought some from harbor freight for cheap and they have worked fine. Expecting the downpipe today, so I should have pics up of everything this weekend.
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Old 10-28-2010, 04:12 PM   #6
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Back in the day when we were doing some TS downpipe research was that some of the stuff out there interfered with the wastegate flappers. Before you spend a ton of time fabbing things up please check to make sure those can open correctly.
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Old 10-28-2010, 04:56 PM   #7
02 Scoob-TN
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Already checked it they clear fine.. ..
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Old 10-28-2010, 05:05 PM   #8
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Quote:
Originally Posted by 02 Scoob-TN View Post
Already checked it they clear fine.. ..
Cool.
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Old 10-28-2010, 05:40 PM   #9
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Do you even have to gasket match? Just because the edge of the gasket is there, doesn't mean that flow is interfering there. Have you matched it to the turbo to see if there is actually any flow obtrustions?
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Old 10-28-2010, 05:55 PM   #10
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the turbo exhaust outlet does follow the contour of that gasket, so i think for maximum flow, gasket matching would be wise in this case. here's a really tiny picture, sorry couldn't find a better one, of what the stock downpipe looks like and why gasket matching would be ideal.

http://h.imagehost.org/t/0934/Photo0543A.jpg
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Old 10-28-2010, 07:31 PM   #11
02 Scoob-TN
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Lightbulb

While I can easily access it, Im going to bevel it out just for good measure. The real trick in making a downpipe this way, is that you can make up a simple jig to help make sure the end product lines up right. You could also take string and make measurements from the base of the flange, where it meets the exhaust tubing to the end of the elbow(top side and another underneath) and use those as a template of where to cut the tubing on your USDM dowpipe. McGuyver would be proud!! Thought it would help to post a pic of a VF37 for reference..


Last edited by 02 Scoob-TN; 01-27-2011 at 07:21 AM. Reason: edited
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Old 10-30-2010, 01:06 AM   #12
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Heres a preview, going to port and install in the AM.



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Old 10-30-2010, 03:59 PM   #13
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you did a really nice job on that man. I want one!
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Old 10-30-2010, 09:14 PM   #14
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looks good man, this should be in the fab thread though i think
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Old 10-31-2010, 11:41 AM   #15
02 Scoob-TN
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Quote:
Originally Posted by olsen726 View Post
looks good man, this should be in the fab thread though i think
It works here too since most people search here for projects related to swap/conversion parts.. The fab threads are more for totally custom/radical fabs.

Got it all installed, sounds like a rally car now. Ill post some photos later..
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Old 10-31-2010, 07:07 PM   #16
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Lightbulb Pics..

Here you go!!









Megan type 2 in polished(one of the first ones in US!!)





Stock heat shield is a go!!







Enjoy,oh and it goes vroom vroom for those who want sound clips!!
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Old 11-01-2010, 05:32 PM   #17
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Do you have a link for this bellmouth? I cant find one searching for VF37 elbow on ebay.
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Old 11-01-2010, 06:03 PM   #18
02 Scoob-TN
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Lightbulb Here you go..

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Old 11-01-2010, 07:10 PM   #19
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I have the same bellmouth for my car, I will be using a TurboXS exhaust with it and matching the bellmouth to the gasket just like you did, nice work!

Did you weld the bellmouth onto the downpipe with the turbo and downpipe fitted on the car?

I would love to hear some sound clips.
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Old 11-01-2010, 10:31 PM   #20
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Quote:
Originally Posted by JDwhiteWRX View Post
I have the same bellmouth for my car, I will be using a TurboXS exhaust with it and matching the bellmouth to the gasket just like you did, nice work!

Did you weld the bellmouth onto the downpipe with the turbo and downpipe fitted on the car?

I would love to hear some sound clips.
Along with this question, can you explain how you created the "jig" to match the bellmouth to 3" piping. thanks.
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Old 11-02-2010, 12:45 AM   #21
02 Scoob-TN
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Lightbulb

Sure, Since your replacing the stock downpipe you can use it for reference points for several measurements. The easiest way to make a jig is to use wood, you can get a nice sheet of birch and cut 8 inches or so off the end to make your marking pieces with. You lay your stock downpipe down on the sheet and simply lay your marking block in position, mark its location on the sheet, screw and glue them in place on the sheet of wood. Remove the stock downpipe from the board and replace with your flange and freshly cut donor downpipe. Make sure they are square in the jig and it should hold them in place(clamps help). Make sure the flange lays flat against the board in the same position as the stock one was.Tack and weld her up and you should be close enough. See photo red lines are where your marking blocks could be.

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Old 11-02-2010, 03:05 AM   #22
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When you say stock downpipe do you mean stock twin scroll downpipe? I'm going from td04 with standard exhaust to full twin scroll conversion with vf36, the guy tuning my car is going to do the exhaust for me anyway so its all good.
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Old 11-02-2010, 04:26 PM   #23
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Dude, Nice job on this! U accomplished in 4 days what it took me almost 8 weeks and several hundred more dollars. My only complaint is that you don't have a cat in there.

It looks like you maybe could have taken more material out... but I'm not sure how much you'd gain by doing so.

I too am interested in sound clips. I see the resonator in that pic. The twinscroll setup is so much louder than USDM unequal length dealie. Unless you're building a race car, it's unnecessarily loud. Hopefully the resonator and muffler help quiet it down. I'm in the processes of quieting down the exhaust on my vf37 equipped 207.

Your USDM Ebay downpipe was shorter than the JDM downpipe, right? I thought about making a jig but the jig I would have made would be based off of the JDM pipe would be too short for mocking up my USDM downpipe. Now that I think of it, the hanger on the downpipe would be your 2nd reference point. Damm... I tack welded my stuff in place w/the downpipe and bellmouth section sitting in the car. It was in and out of the car a dozen times before things started to fit. The wooden jig is probably the way to go.

Do you have a bung for the rear o2 sensor?

Anyways, good job. I wish you had done this 3 months ago so I could have used your experience as a starting point!
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Old 11-02-2010, 08:47 PM   #24
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usdm length dp should be longer than the V8 jdm unit. V9 jdm downpipe was extended to usdm length.
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Old 11-03-2010, 07:33 AM   #25
02 Scoob-TN
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Lightbulb

Yeah I could have got in there and took out a little more material. But, I didnt think it would make a big enough improvement to flow to justify the possible weakening of the pipe. The donor pipe was USDM length(has a rear o2 provision), and like Scoobystas said after the bends in the pipe it is just about 4 inches longer than the JDM one and it was a straight shot. I chose the Megan catback because of reviews that said it was a little quieter and deeper than others. Its pretty low at idle but loud as hell when you open it up. Doesn't sound too ricey though, more rally'ish. You can tell its a boxer, I'll have to work on posting some videos this weekend..Thanks to all for the compliments!!

Last edited by 02 Scoob-TN; 11-03-2010 at 07:54 AM.
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