chilort
06-20-2008, 12:42 PM
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.
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.