Velocity Stack

[chilort]

I'm likely the only one silly enough to do this, but....

When I bought my intake to intercool the log, I also got a ported TB. The porting was nice, but there was no radius at the entry into the hole.

I took my spare TB and used it to get started. You can see there is a slight radius on the stock TB, but not much. This is not good since air doesn't like right angles, without a nice radius, air will make its own. The problem is that the way air does this effectively reduces the throttle opening to 90% of the real diameter. Considering how small this is to start, that doesn't help:
http://farm4.static.flickr.com/3006/2595813754_36169404f5.jpg

I made an outline of the TB on 3/4" MDF and cut out the pattern with a scroll saw:
http://farm4.static.flickr.com/3265/2595813996_f02778c5d7.jpg

Then I used a dremel tool to cut the groove on the bottom side to go over the stock lip on the TB:
http://farm4.static.flickr.com/3090/2595814340_06d2c7eb1d.jpg

Ah, nice fit:
http://farm4.static.flickr.com/3128/2595814616_5758e81f37.jpg

I located the hole for the throttle itself and rough cut it with a paddle bit:
http://farm4.static.flickr.com/3088/2595814914_8ba4a9dd1f.jpg

The back to work with the dremel to get the hole to the exact size of the ported TB. I also put in a nice radius and cut the hole for the idle circuit:
http://farm4.static.flickr.com/3120/2595815218_e6fb9870e5.jpg

And another shot:
http://farm4.static.flickr.com/3260/2595815496_439cde148d.jpg

I painted it black so it wouldn't look like I have wood in car. I used some RTV to make the bottom gasket, reused the stock gasket on top, and fired it up.

Does it make any difference? If so, I really can't tell. ... wait, I meant to say that the design is brilliant. I gained 10hp and lost 2 seconds off my quarter mile time. Now give me big money and I'll make you one too.

[BadAssPerformance]

Interesting, anything to help a draw-thru setup efficiency has to help! :thumb:

[BF/STOCKER SPIRIT]

A Future Barry Grant, Kool! Maybe A Throttle Body Spacer, Will Give ,2 Seconds Back,, Good Going!

[A.J.]

That reminds me of this:

http://www.grouchyoldcripple.com/archives/001002.html

A.J.

[GLHNSLHT2]

a lot of work to get that POS TB and intake to work as well as a stock blowthrough setup. :rolleyes:

[The Pope]

why not just cut the TB in the first place to get the round?

[8valves]

Perhaps the man doesn't have the proper tools to do the radius in the aluminum, and the MDF would shape up in a matter of minutes comparitively.

And/or maybe he just wanted to do something for the heck of it that would take a bit of a day, rather than tear apart a perfectly running car to go to a T2 setup?

There are some fast T1 cars with less time, money, and effort into them than T2 swapped cars.

Nice work on that piece there.

[crazymadbastard]

Good work there! can only help.
:thumb:

[chilort]

The OD of the TB is 2". For the amount of taper and radius I used, I was afraid I'd go through. I'm not yet a talented porter. Plus, I had some MDF sitting around from some other projects:

http://farm1.static.flickr.com/70/204453451_0f3f5cc2ec.jpg
(a set of speakers I built for an old B&O intended to drive 4ohm speakers, not 8ohm)

If I decide I like it, or if it really makes a difference, I can make a mold of this part or I can make it from phenolic or something. This is only 3/4" material, I can also try different thicknesses to see how the entry works with the throttle blades. I won't, but I could.

Also, with being a piece of MDF, I can unbolt it at the dyno and actually see if it makes a difference in a very short amount of time.

Thanks for the positive comments and feedback.

[4 l-bodies]

I like it! I do have one ? I have a GLHT with log manifold w/ Spearco intercooler kit on it. My T/B is very close to the hood bracing. The ?, does your hood shut?:p I don't think it would on a GLHT.
Now move on the the next 90 degree bend below the T/B where it turns into the turbo. The factory one is terrible. I made one out of mandrel bent tubing about 20 years ago! Fits perfect with a larger T/B and larger compressor inlet. Glad to see someone still plays with the log manifold cars.
Todd

[turbovanman²]

I think its a great idea, the air is directed in, instead of hitting the dead air space around the T/B entry.

I would drive it around without it for a few days, then put it on, noting boost changes, throttle response differences, etc, :nod:

[Ondonti]

is the TB flange the same as our more normal tb's?

[turbovanman²]

is the TB flange the same as our more normal tb's?

Nope.

[minigts]

What happened to this?

[chilort]

So far so good. It certainly didn't hurt anything.

[minigts]

So far so good. It certainly didn't hurt anything.

Do you see or can you tell of any gains? I'm curious if it helped.

[chilort]

I have no dyno or track numbers. I had a Gtech years ago but it broke.

My seat of the pants guess is that it helped. I would swear it sounds more growl-y as I role into the throttle too.