Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[snm95ls]

GT25 version perhaps?

[Avistar23]

Weir could hook you up with something nice, I have loved every part hes done for me!

[HiProfile]

Thats a 2.5" though I just noticed, I need 3"

I was just thinking, since the v-band flange goes over the pipe, you could probably use a flange that has a thick weld area on it. Meaning a 3" OD tube would practically fit perfectly OUTSIDE a 2.5" v-band flange. Look at the links below:

http://cgi.ebay.com/ebaymotors/2-5-V-Band-FLANGE-Kit-Mild-Steel-Turbo-Downpipe_W0QQitemZ350289856989QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item518ee709dd

or

http://cgi.ebay.com/ebaymotors/2-5-Inch-Turbo-Exhaust-V-Band-Clamp-2-Vband-Flange-Kit_W0QQitemZ390125882328QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item5ad5508bd8



I'm sure Weir could make 3" v-band ring with a 2.25" inlet. Like all his work, it would be $$$, but you get what you pay for with him. :yes:

[mandrel-bends]

That won't work on a 2.5" ring. A typical 2.5" vband flange has a 3/8" wall, so the ID is 2.510, but the OD is then 3.250".  It's a 3/4" step from ID to OD.

[HiProfile]

That won't work on a 2.5" ring. A typical 2.5" vband flange has a 3/8" wall, so the ID is 2.510, but the OD is then 3.250".  It's a 3/4" step from ID to OD.

I don't think you understand me, or your normal clamps are sized crazy. Think of a step-tube header, it would be done like that.

In the picture below, I'm talking about putting it on the OD of the flange's right side. In that cross section, a 2.5" OD tube would go below (inside) it. A 3" OD tube would instead be put above (outside) the right side's lip. The 1st 2.5" link above shows a flange much thicker than the pic's .07-.08" lip, enough to either butt-weld or lap-weld a 3" tube to it.

[mandrel-bends]

I see what you are saying. On that side you'd get 2.66-2.70" OD. So if you slide 3" tube over it (assuming 0.065 wall), you would get about an 1/8" gap all the way around the tube. The advantage of doing it this way would be it could be kept pretty short, but you would have a relatively large gap to fill.

[turbob16hatch]

Thats a 2.5" though I just noticed, I need 3"

For one i can't believe this thread has gone on this long. Just buy the mandrel bends one and go 2.5" to 3" after the v band.

If your using a garrett 5 bolt. i guarantee you will not have an issue with a 2.5" v band. just it is low profile.

[HiProfile]

The reason I keep adding is because of my situation. I'm getting a 50trim t3/t04e with the .78ar ATP housing which has a 3" v-band. I want to test that against my .63ar housing when I get everything together w/o cutting & welding my downpipe or the housing. I *neeeed* to have the most compact 3" v-band on a 5-bolt flange - hence having ideas how to do a 3" on a 5-bolt flange.

Mandrel-bends, look at the ebay link above, or their picture below. They definately do not use the 'typical' .07-.08" thick wall, as they specifically state it's extra thick. It has to be at least 3/16" thick, enough to weld a 3" onto it somehow. That picture of the v-band is a typical clampco flange and only served to show where I was intending it to weld to. To make a long story short, I'm saying it's possible to use a 2.5" v-band with a 3" pipe w/o a reducer - with the right v-band flange. Not an average flange. I hope I'm not confusing, but I'll do some MSPaint if needed.




One thing that's similar is a 3"-4" closet flange, aka toilet flange. They are designed to fit inside a 4" ID pvc pipe, as well as fit outside a 3" ID pvc pipe.

[Avistar23]

Thats a 2.5" though I just noticed, I need 3"

I'm sure Weir could make 3" v-band ring with a 2.25" inlet. Like all his work, it would be $$$, but you get what you pay for with him. :yes:

he made me a 4inch to 3 inch v band converter for my holset, like i told the OP above, if he wants somthing so perfect, have someone make it.

[mandrel-bends]

Ours is 0.080, and definitely won't work - huge gap. You might email him and ask how thick they are. It will need to be pretty tight to get a good weld in there, and it wont be a very easy weld due to the flange height blocking you coming in from the side.

[HiProfile]

I fully understand, I just never said possible = easy. ;D

One thing I got last year just for shit like this is a 3" collector reducer (for v8 headers). Summit had some stainless pairs for a steal (included the flanges), and go from as large as 3.25" down to 2.25". You just don't get a smooth conical transition.