5-in Downpipe

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Mar 20, 2006 | 10:23 AM

Big Geek

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From: Montgomery, AL.

5-in Downpipe

Can you say monster?

Jim C.

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Mar 20, 2006 | 10:32 AM

RyanJ

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But it necks down. Is that really a 5" downpipe? I personally don't think so.

Mar 20, 2006 | 10:34 AM

Big Geek

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That is just one of them. I can't find a pic on Jason's site for the one that doesn't but he can build em anyway that is needed.

Jim C.

Mar 20, 2006 | 10:48 AM

TS6

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There are gains to be had with a larger downpipe that necks down. It reduces backpressure at the turbine outlet, and helps with velocity.

Mar 20, 2006 | 10:51 AM

NOSjohn

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Yep, that is a big'un...looks like a nice piece.

Mar 20, 2006 | 10:53 AM

smokinHawk

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From: Columbus, ohio

ya a little bit. Na$ty-Ta's is like that coming off his GT42. also speed inc did that to one of their turbo kits in their shop car

Mar 20, 2006 | 11:13 AM

Big Geek

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Quote:

Originally Posted by TS6

There are gains to be had with a larger downpipe that necks down. It reduces backpressure at the turbine outlet, and helps with velocity.

I was gonna splain that too but I have already been in one pizzing match today and didn't want to take the chance on getting into another being that I don't know the gent. In addition to the added volume nearest the turbine the taper can also create a scavenging effect that helps with the velocity of the exhaust gasses leaving the turbine and thus as you stated helping backpresssure. Thank you for pointing that out as I wanted to make sure I didn't ruffle anymore feathers today.

Jim C.

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Mar 20, 2006 | 11:42 AM

Wet 1

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The 90* elbow is the largest restriction for that pipe layout, having the reduction after the elbow is what's really key.

Mar 20, 2006 | 12:24 PM

#10

F8LWS6

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Thats the RJC 5 inch downpipe! I remember when they came out with that. That thing is definetly monster size.

http://www.rjcracing.com/RJC_Buick_P...5in_dpipe.html

More pics there.

Mar 20, 2006 | 12:40 PM

#11

NA$TY-TA

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Yep im 5" off the turbo stepped down to 4"..... and its to clear thru the K-Memeber.....

We were going to try a 5" all the way like this

But decided to do it like this.....

Kyle

Mar 20, 2006 | 09:23 PM

#12

Big Geek

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Good looking setup there chief. To the gent above you are correct in that it is Jason's piece. That guy does some GREAT work. A1 guy to boot!!!

Jim C.

Mar 20, 2006 | 09:32 PM

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Pro Stock John

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Wow you guys are building some crazy race cars, that's all I can say.

Mar 20, 2006 | 10:26 PM

#14

F8LWS6

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Quote:

Originally Posted by Big Geek

Good looking setup there chief. To the gent above you are correct in that it is Jason's piece. That guy does some GREAT work. A1 guy to boot!!!

Jim C.

For sure. The power plate is awesome. Got em on both the cars.