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Old 08-17-2006, 11:17 PM   #1
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Default L67 Throttle Body Improvements

I put the TB on tonight, by itself without any other mods to keep from wondering which mod added how much performance.

At low speed WOT there was a different sound and feel. The best I can do to explain the sound is that it sounds like it is trying to suck my K&N out of the airbox and through the throttle body. (I wonder if the filter will burn when it gets to the combustion chamber).

Tossed a couple of codes around. One regarding TPS, which is expected when swapping things around. And a few occurrances of one particular code. This code proves that the PCM sees more air and learning how much more fuel is needed to compensate. Lean Bank 1 P0171... More air than fuel.

If necessary I can swap my FPR to compensate with additional pressure.. only if a couple days of driving doesn't learn in the proper fuel though.

At the top end...there is a noticable difference that is tough to describe beyond saying that the pull is greater and smoother.

The MAF screen was also removed at the same time.

My buttdyno says that it feels better.

Hey Wren
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Old 08-17-2006, 11:34 PM   #2
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exactly what mods to it did you do?
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Old 08-18-2006, 12:06 AM   #3
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I did.

I shaved the throttle shaft just like Don'*. To reduce cross-sectional area at WOT and reduce turbulence from 5% to 85% throttle angles. I also lightly polished the bore.

Similar but slightly different results than Don'* L36 TB that I did, as would be expected considering the different types of aspiration.
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Old 08-18-2006, 01:41 AM   #4
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Quote:
Originally Posted by willwren
I did.

I shaved the throttle shaft just like Don'*. To reduce cross-sectional area at WOT and reduce turbulence from 5% to 85% throttle angles. I also lightly polished the bore.

Similar but slightly different results than Don'* L36 TB that I did, as would be expected considering the different types of aspiration.
I did my PEM'*, Cat , Plugs, oil and filter, air filter all before the TB... Drove the car around a while first, and then installed the TB... The Cat was a good improvement and I believe that it also helped me realize the improvements of the PEM'*... The exahust shop did agree that I was well on my way to a plugged cat... Myself and Lash were happy with the improvements... After driving 100 miles with the new cat i installed the TB and had yet another improvement...

Looks like a couple of positives to me Bill and Bill...

Glad to hear you like it Boosty

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Old 08-18-2006, 02:26 AM   #5
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Quote:
Label/Receipt Number: 9102 1501 3471 1552 4614 75
Status: Enroute
Its only a matter of time before mine gets to Mr Bill'* house

Then of course I must wait with patience as he does his thing.
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Old 08-18-2006, 02:34 AM   #6
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I still have an L27 TB ready to go. But I need to select the right car and owner first.

I'd like a Northstar willing to play. Any volunteers?
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Old 08-18-2006, 09:49 AM   #7
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Ahhh, the infamous P0171.
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Old 08-18-2006, 10:16 AM   #8
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What style L67 TB was this done on? a '99+ style TB or a '96-'98? If on the older style don't you think their would of been a gain just in swaping TB'*? and even bigger gain in porting it?
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Old 08-18-2006, 11:39 AM   #9
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Interesting that you ask what style.

I thought it was a 96-98...however..I had 2 and didn't pay much attention. This one has two vacuum ports on the side and I needed to plug one. Whereas my 97 only has one port.

Not sure if that makes this a 96 or 99...it'* not a 97..that much was for sure.
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Old 08-18-2006, 12:36 PM   #10
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The double port was for cars that had the 4T60-E, the single port was for the 4T65-E as it used no Vacume Modulator... But I would like to see the diffrences from 96-99

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