Fast intake and a BBK TB
Fast intake and a BBK TB One of the shops that has these intakes has to have one of the 80mm BBK TB's laying around. Don't know if you would see much over a ported stocker, but it is at lease a couple mm's bigger.
When doing the stock style intake vrs LSX, will someone try a Stock ported TB and BBK TB as well. Its 5 minutes of extra work if you have one laying around.
When doing the stock style intake vrs LSX, will someone try a Stock ported TB and BBK TB as well. Its 5 minutes of extra work if you have one laying around.
On The Tree
Joined: Dec 2003
Posts: 179
Likes: 0
From: Bloomington, MN
i {we tpis} have done alot of dyno testing. the bbk 80mm lost 5 hp compared to our ported stock tb. it's a poor design, there was also a test in hot rod mag. they also lost hp with a bbk.we have a new oval billet tb 88.5 at it's widest that would be interesting to try, but it sounds like we would have to build an adaptor we have a manifold coming {fast}and will dyno a 422 with this combo. will post results.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Just because it lost power on an LS6 intake doesn't mean that it will on an LSX intake. It makes sense that it wouldn't work so well on the LS6 intake since the intake opening is smaller than the TB (has to step down to enter the intake manifold which causes turbulence.) It just doesn't stand to make more power because the manifold inlet is no bigger than a ported stocker. But, on the LSX intake, this wouldn't be the case. My money is on the BBK making better power with the LSX.
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I dyno tested the BBK on a stock internal LS1.If I remember correctly, it made 1 rwhp and 3 rwtq.
I would like to see results of opening the LSX to 80mm.I can't see it losing any power.
I would like to see results of opening the LSX to 80mm.I can't see it losing any power.
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TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
PSJ, if I'm not mistaken, the blade of the BBK is only 80mm. You'd need to change that as well to make any difference, IMO. It's not like the stock LS1 TB where you have a huge lip that can be gotten rid of.
Originally Posted by Colonel
PSJ, if I'm not mistaken, the blade of the BBK is only 80mm. You'd need to change that as well to make any difference, IMO. It's not like the stock LS1 TB where you have a huge lip that can be gotten rid of.
It's nice to know my BBK is a POS, I feel so much better. I believe from what I read that the LSX has a 5 bolt pattern for the 90mm, but this might be for their own 90mm TB. I like to bore out the BBK I have since it sucks a big vacuum! 
Originally Posted by JohnnyStorm
It's nice to know my BBK is a POS, I feel so much better. I believe from what I read that the LSX has a 5 bolt pattern for the 90mm, but this might be for their own 90mm TB. I like to bore out the BBK I have since it sucks a big vacuum!
On a LSX intake with the 90 mm opening it would be different.
On The Tree
Joined: Apr 2002
Posts: 170
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From: Ft. Worth, TX
I have the BBK and I just received my new LSX 78mm intake. They didn't tell me that I needed a new coolant crossover so I have to order that. Once I do, I'm going to look at the best way to mate up the BBK to the 78mm LSX. I'm hoping to get rid of that spacer that narrows down the flow. Maybe even port the opening to the LSX intake a bit to fit the BBK if needed. I've never seen or done any porting, but I do own a Dremel 
. It doesn't sound too tough.
. It doesn't sound too tough. Last edited by Creed; Feb 14, 2004 at 04:35 PM.