Coupler Problem

1fst54 · 07-09-2008, 10:54 PM

First off I have 3" pipe coming from the intercooler to the throttle body. The throttle body is a BBK cobra oval. I ordered a 3" to 4.25" transition but it doesn't fit. It seems that I need another .25" to make it work. The problem is companies don't make a transition in that size to go to 3".

What are you guys using for a coupler? Are you guys running 3" pipe to the TB? Can I make the 4.25" work around the oval.....am I being a puss?

DallasGT01 · 07-09-2008, 11:49 PM

being a puss i think.. j/k

can you not get a 3.25 to 2.75 or something...

or a 4.5 to a 4.25

do alittle grinding to make it look right...

idk...

skidmarkracing · 07-10-2008, 08:28 AM

that is the same setup I am running and it works just fine. I will double check on my coupler and let you know.

1fst54 · 07-10-2008, 09:59 AM

Race part solution say a stock cobra tb takes 4.25. It seems to small.

Skid, if you can measure and let me know you have a BBK cobra tb and it works that would be great. I'm thinking of sending it back for a 4" to 4.5" and calmping the shat out of it on the 3" side.

Just went out side with some string and measured the TB and got 14.4" diameter, then I divided by pie(3.14) which got me a ID for a coupler 4.585"
So I do need a 4.5"......right?????

skidmarkracing · 07-10-2008, 10:48 AM

Yep its a 4.5. a solution for you is to get the 4.5 coupler and then sleeve the piping side down.

1fst54 · 07-10-2008, 11:07 AM

Sorry, I not sure what you mean by sleeve the pipin down side.

For the 3" side?

I will have to get a 4" to 4.5"

skidmarkracing · 07-10-2008, 02:15 PM

get the 4.5 transition
the part that goes on the 3" pipe is too big, put a 3" coupler over your pipe then slide the transition on it. this will build up the pipe size you you dont have to shrink the coupler so much.

another option is to flair your pipe to match the coupler

skidmarkracing · 07-10-2008, 02:24 PM

you can always us a hard transition to up your 3" pipe

1fst54 · 07-10-2008, 03:39 PM

Quote:

Originally Posted by skidmarkracing

you can always us a hard transition to up your 3" pipe

NO room for a hard transition.

I will be flaring the 3" pipe to receive the 4"

07-09-2008, 10:54 PM	#1 (permalink)
1fst54 Turbo Inside! Join Date: Jun 2005 Location: Florida Posts: 1,169 View this user's gallery iTrader: 0 / 0%	Coupler Problem First off I have 3" pipe coming from the intercooler to the throttle body. The throttle body is a BBK cobra oval. I ordered a 3" to 4.25" transition but it doesn't fit. It seems that I need another .25" to make it work. The problem is companies don't make a transition in that size to go to 3". What are you guys using for a coupler? Are you guys running 3" pipe to the TB? Can I make the 4.25" work around the oval.....am I being a puss?

07-10-2008, 09:59 AM	#4 (permalink)
1fst54 Turbo Inside! Join Date: Jun 2005 Location: Florida Posts: 1,169 View this user's gallery iTrader: 0 / 0%	Race part solution say a stock cobra tb takes 4.25. It seems to small. Skid, if you can measure and let me know you have a BBK cobra tb and it works that would be great. I'm thinking of sending it back for a 4" to 4.5" and calmping the shat out of it on the 3" side. Just went out side with some string and measured the TB and got 14.4" diameter, then I divided by pie(3.14) which got me a ID for a coupler 4.585" So I do need a 4.5"......right????? Last edited by 1fst54; 07-10-2008 at 10:15 AM.

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07-09-2008, 11:49 PM	#2 (permalink)
DallasGT01 Just a Slow HD... Join Date: Sep 2007 Location: FRISCO TEXAS!!!! Posts: 1,330 View this user's gallery iTrader: 0 / 0%	being a puss i think.. j/k can you not get a 3.25 to 2.75 or something... or a 4.5 to a 4.25 do alittle grinding to make it look right... idk...

07-10-2008, 08:28 AM	#3 (permalink)
skidmarkracing My wife says i'm retarded Join Date: Dec 2005 Location: Wylie, TX Posts: 965 View this user's gallery iTrader: 12 / 100%	that is the same setup I am running and it works just fine. I will double check on my coupler and let you know.

07-10-2008, 10:48 AM	#5 (permalink)
skidmarkracing My wife says i'm retarded Join Date: Dec 2005 Location: Wylie, TX Posts: 965 View this user's gallery iTrader: 12 / 100%	Yep its a 4.5. a solution for you is to get the 4.5 coupler and then sleeve the piping side down.

07-10-2008, 11:07 AM	#6 (permalink)
1fst54 Turbo Inside! Join Date: Jun 2005 Location: Florida Posts: 1,169 View this user's gallery iTrader: 0 / 0%	Sorry, I not sure what you mean by sleeve the pipin down side. For the 3" side? I will have to get a 4" to 4.5"

07-10-2008, 02:15 PM	#7 (permalink)
skidmarkracing My wife says i'm retarded Join Date: Dec 2005 Location: Wylie, TX Posts: 965 View this user's gallery iTrader: 12 / 100%	get the 4.5 transition the part that goes on the 3" pipe is too big, put a 3" coupler over your pipe then slide the transition on it. this will build up the pipe size you you dont have to shrink the coupler so much. another option is to flair your pipe to match the coupler

07-10-2008, 02:24 PM	#8 (permalink)
skidmarkracing My wife says i'm retarded Join Date: Dec 2005 Location: Wylie, TX Posts: 965 View this user's gallery iTrader: 12 / 100%	you can always us a hard transition to up your 3" pipe