I have my MTI stage 2 LS6 heads and X1 cam coming and I am thinking of upgrading to a larger TB. Anyone have any experiance with this one or is there a different one that you guys would recommend. Any input would be appreciated!
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

Only reason to get one of these is if you can open the throttlebody opening in the intake. This can be done with a Holley or sheetmetal intake either one. If this isn't done you really have no benefit over a ported stock throttlebody. I've seen them both on a flow bench and in most cases through an LS6 intake a good ported one flows as well or better. I do have the BBK thought but my intake has been opened for it. Just depends on what intake you have and your future plans. The BBK has plenty of small problems you'll have to work out but once you get it fixed correctly it should be fine. Its expsensive for what you get to say the least.

 

BBK comes with a adaptor plate that necks it down.

With the adaptor plate I think it's worth nothing over a stock ported TB.

Ditto on what Derek said, I would run one if your intake manifold inlet was opened up to 80-85mm. Stock ours are 75mm.

 

That is a very good point about the adapter that comes with the BBK. I was wondering what purpose it served.
I am planning to change the LS-1 intake over to the LS-6, and I think I will look and see if I can port it out and eliminate the adapter.
Thanks for the info....
Dave

 

I just installed a BBK 80 mm this weekend on my 01 Z28 (came stock with LS6 intake) and I LOVE it. The first time I punched it in 1st, I hit my 6600 RPM rev limiter (was never able to do that before).
I installed the throttle body directly on the intake (no adapter). I did get a strong whistling sound. I then removed the TB, blended the intake face so it was not sharp (made it more like a vintury) and now the sound is almost gone. When I get some time, I will take the intake off the car and do a full polish on that area.

My suggestion, $400 + is a lot (its worth it.... but still a lot). I just put a post up stating that I wanted to buy someone’s BBK on here, LS1.com, Camaroz28.com, and Corvetteforum.com. Within about two weeks I found someone willing to sell for $300.

Chris

 

If you look into the TB, since you did not use the adaptor, can you not see the orange gasket on the intake?

 

I was unaware that you could port the stock intake manifold. I have an LS6 intake waiting to go on when the cam and heads get here.

So if I am reading Camaroguys post right, the LS6 intake has a stock 80mm opening?

Can someone set me straight.

 

LS1, LS6 intakes are like 75.5mm, so if you do not use the adaptor you will have an edge in there. That probably is the cause of the whistle.

Stock intakes are cannot be ported to 80mm unless you plan to epoxy the lip.

Someone post a close up of an LS6 intake lip?

 

can you grind the lip at an angle to try and increase the airflow so you dont have a sharp angle in the air flow path?

 

A few years ago I had a stock TB bored out to 80mm.

It's still sitting on a shelf.

I can see the intake inlet gasket all the way around. The lip is very thin. Thinner than (I think) you think it is.

Maybe someone can post a pic of the adaptor plate.

 

John,

I would like to see a picture of that modified intake. I'll be doing something similar in the near future with my LS6 intake. I'm not afraid of epoxy either. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

Not a modified intake, Jantzer, a custom bored OEM TB. I now thinking it's just 79mm. Just the same you will see gasket material all the way around.

I am trying to hook up with my machine guy again to go maybe even more, I'd like to see if the stock TB will go 85mm.

 

Scott keep doing those worthless mods. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

I'm going to go with a sheet metal intake when I find one that has good results.

 

I have the BBK 80 mm TB on my car which has a stock cam and heads, but 1.8 rockers, a modified MAF and a MAFT. I have had no problems with the unit. It idles great and pulls right up to the Rev Limit. I have heard other people complain of idle problems, and a whistle at off idle... but I have no experienced these problems. I guess some others may give more insight. It might be a hit or miss thing with the TB... I have heard of people having piston slap noise in brand new LS-1's, but I have not experienced that either... which I have been told GM claims is normal and acceptable.

Good luck with your project.

 

WOW!!! S2 LS6 heads and X1 cam <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> You'll be taking no prisoners at PR <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" />

I just hope I can hang somewhat close to you when I'm done with my lowly set-up using S2 MTI LS1 heads & my B1 cam <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John B:
<strong>WOW!!! S2 LS6 heads and X1 cam <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> You'll be taking no prisoners at PR <img border="0" alt="[hail]" title="" src="graemlins/gr_hail.gif" />

<img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">well we will see what it does. I am hoping for the 435+RWHP. I would really like to see 450. I might bring it out to PR once or twice but its not really being set up for the strip.

 

NataSS, I see you posting about that BBK for sale on LS1.com, WickedOO is someone I know, you could always try it and resell it if you get it cheap.

Upon some additional input, I will take my bored out one and true it to 80mm like a BBK. I can get custom blades made too. I'll show a pic of how much gasket you will see.

 

That would be great, send them when you can

 

The BBK throttle body DOES work - even though the intake manifold opening only opens to 75mm. Even with the adapter plate!

Reasoning?

The stock throttle body is 75mm, but in terms of effective area, is smaller because of the restriction present with the throttle blade, shaft, and screws. So, with the BBK, you have an 80mm area that is reduced by the blade, shaft, etc - that lets more air get through the BBK.

By the time you get to the intake, there is just 75mm of pure cross sectional area worth of straight unrestricted airflow.

I'm not sure the BBK is worth any power, because I don't know if the engine needs more than a 75mm throttle body. But the BBK 80mm defintely increases flow over a stock body even with the stock intake as a restriction (which, as I explained above, it's really not).

QUICK

 

Dyno it and prove it.

I have heard it pick up 2-5rwhp. For $400 that is a bit crazy. Stock ported TB's pick up the same.