PNP'd my own TB

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Turbo&Auto

Turbo&Auto

Nick Go FAST!!
I read on Nasioc that you pick up a few HP by tapering the TB out to a knifed edge. Does make sense. The TMIC is directly connected to the TB, so airflow is coming out and then hitting a .25" thick wall. The stock TB also has a lil lip just before the throttle plate too.

So I started by removing the lil lip and tapering the whole TB. Then polished it up nice and re installed. I noticed some nice off boost throttle response pickup as well as a lil better top end.

I got bored at work and had a thought....What if I mill that center arm down?? This would make more room for airflow without actually enlarging the center bore of the TB further. This is the results:

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It took the results of the 1st step and just enhanced them even further! The top end is incredible now. I wish I had access to a AWD dyno so I could put some real numbers to this but my g/revs went up when I logged. Before I had a peak of 230 G/rev from 5800 to 7000. Now Im pulling 233-235 from 6K -7200. Im happy with the results :)
 
Nice work.

Next PNP job; intake manifold. Remove or hone the tumbler gas valves (TGVs). Then throw on a new turbo inlet hose from ebay or the nasioc classifieds.

I'm sure thats a real nice car you have, especially with it being a few hundred pounds lighter than a WRX and having your constant tuning and tweaking abilities to fine tune.
 
I just purchased a 20G the other day. Went with the Td06 20g with a 7cm exhaust housing. Hoping to hit full spool around 4K.

Also picked up DW 750's, APS 65mm CAI, BPM inlet. I plan on removing the Intake Manifold and doing the TGV delete and PNP'ing them as well :)
 
I taper mine out from the plate to the end some too but i do it by hand....drill and several steps with different stones, sanding wheels, polishing wheels, etc,etc....

This is the one on my LS....

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You polished it up nice, taper the very end out to a thin rolled edge. You still have a thick edge there :)
 
At work :) LOL!

I sometimes get lucky and have stuff to program. Each part takes 20+ mins on an automated test setup. So I get some downtime to play around a lil :)
 
I tapered the TB on my old LST. But it looked much more like Turbo&Auto's. Sorry no pictures.

But T&A, looks great. :thumbsup:
 
like this T&A?

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this was my b16 TB.. of course i didnt do it.. Maxbore did

64mm and i believe it tapered out to 66mm
 
Yeah man, thats the way :) The Matrix guys use maxbore as well. i think they bore the whole center and replace the plate, correct?
 
Damn, thats a monster! LOL! I just sold the power one I had, 68mm with a taper to 73mm. Wish I couldve used it first to say what a TB that size does for me :)

I noticed the only difference in mine and that one is I countersunk my screws and thinned all the way to the ends. I need to look at some more and see why they did that over what I did.
 
I love bridgeports.


At first I didn't realize that was an endmill and was like "why is he drilling the shaft?".
 
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