An interesting Throttle Body story - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 06-04-2006, 10:49 AM   #11
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That'* for my water injection nozzle. I was able do this to spray pre-rotor, but after the throttle plate without using a TB spacer. It was a trick to get in there, but it was literally the only chance to get that nozzle between the rotors and throttle plate without machining the SC itself or machining a spacer.

I ported the other two TB'* for Series 2 test cars. One is going on a 97 SSEi, the other is going on a 95 L36 (names are being withheld so people don't bug the living snot out of them).

Most of you know (and some don't) that I've been playing around with TB'* for quite some time. Including the two TB'* for my own cars, I now have 5 out of 6 TB'* in my posession ported in one way or another. Only the one on the 93 is still in stock form (95 TB), but that won't be for long. It'll go stock back on the SLE, and the ported one will go on it.

I did alot of polishing yesterday on that one after machining. I'll post a couple more pics when I get them cleaned up and the nozzle installed.
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Old 06-04-2006, 11:11 AM   #12
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you never cease to amaze me
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Old 06-04-2006, 12:17 PM   #13
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man thats sweet so if the tests turn out alright would you be willing to port TB for other members?
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Old 06-04-2006, 12:34 PM   #14
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Tests on my cars have already proven it for the S1 L67'*. There are a good number of Northstar enthusiasts now starting to do the same thing.

I will NOT do more of these. My goal is to try it on my own, if it works, I get a couple more test cars (chosen carefully for a number of factors) and prove it. If it works, I show YOU how to do it.

Each one of these TB'* takes about an hour to do. It'* very difficult to see in there well enough to prevent damage to the bore. Fixturing is tricky as well. I actually spent more time polishing mine yesterday than I did machining it, including the WI nozzle feature.
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Old 06-05-2006, 12:20 AM   #15
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Name:  tb23.jpg
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Name:  tb24.jpg
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Getting closer to install.
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Old 06-05-2006, 12:30 AM   #16
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Verry clean.
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Old 06-05-2006, 12:33 AM   #17
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I had to remove that little sucker from my filter today, and move the IAT back to the filter. And plug the IAT hole in the pipe.

Slowly getting the system back to where all the components are where they should REALLY be. There'* a little bit of polishing on that TB too. Not done yet, but looking pretty good.
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Old 06-05-2006, 09:44 AM   #18
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Looks good Bill...

Especially sneaking that nozzle into that position.

With the information you will be able to provide later on, would the average member be able to take their TB to a machinist for this type of work? I assume most members wouldn't have the equipment available, but the information that could be provided should make it easy for a skilled machinist?
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Old 06-05-2006, 09:48 AM   #19
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That'* the goal. Shaving the throttle shaft should take a good machinist no more than 30 minutes.

I want to get these other two test cars going first to see if it makes a difference. It'* more of a supporting mod, but there should be more flow at WOT.

Spending the time to polish the inside of the bore is something anyone can do with a dremel, but you MUST not take material out where the throttle plate rests at idle.
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Old 06-05-2006, 10:23 AM   #20
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Interesting side note here. I just noticed that the o-ring for my nozzle is missing. I had the nozzle inside the filter pointing back up the pipe on a custom bracket. The airflow apparently sucked the ring off the nozzle, and the motor ate it.
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