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Old 11-22-2009, 07:33 PM   #11
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If you pick a some N* TB at the salvage yard, let me know, you can send me one. I got a LS1 MAF coming, and was going to modify a stock TB by removing the MAF post. But if I had a N*, that saves me the trouble.
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Old 11-22-2009, 08:41 PM   #12
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What this a dream come true I get to help Dan the man. Yeah just give me your address and everythign you need i.e. sensors and such. I'll pick it up during the week
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Old 11-22-2009, 09:20 PM   #13
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Nighthawk, I think you're right about ZZP'* throttle body. So you should bolt on an L67 throttle body instead! It'* the same bolt pattern as the L36 one, but bigger, and you just have to do some porting to the UIM to open it to a round hole rather than an oval. Also, plug the coolant line going to the throttle body to get rid of that nasty heat. There'* a walkthrough somewhere here - agrazela and 95naSTA should know.
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Old 11-22-2009, 09:57 PM   #14
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So if I could simplify this. all I need is a L67 TB A modded UIM and a tune and I can have a sick result. I found the thread and looks like thats it. https://www.gmforum.com/t259142/
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Old 11-22-2009, 10:04 PM   #15
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That seems to be the result of what he got after putting the L67 TB on his L36 UIM. I'm not sure how to get here to read more:
http://www.bonnevilleclub.com/forum/...ic.php?t=78557

I tried this setup, but it didn't work:
gmforum.com/t78557
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Old 11-23-2009, 01:17 AM   #16
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Na, that wont work, or a hundred other things I tried. The "interim owner" reformatted the database to vB without choosing a key option. It scrambled the sequencing. I have had good luck using the Forum search Engine. Everything is still in place, you just need the right keyword to find old stuff.
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Old 11-23-2009, 02:48 AM   #17
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I can't find posts by these guys. The oldest ones shown on the forum are actually fairly new in my memory. It looks like the old posts are missing. What luck that I have excerpts somehow!

Quote:
Originally Posted by agrazela
... a modded L67 TB is the cheap n' easy way to go to open up flow. What I found from scanning and graphing is that the larger L67 throat on an L36 gets you into higher MAP faster (i.e., at lower TPS%), and higher MAP faster = higher VE faster = more powah faster!

To put an L67 TB on an L36 UIM will require you to fill in the L67 TB mating flange with epoxy (and sand it flat), and to alter the three mounting holes a bit to raise the TB a scooch to better center it on the L36 UIM inlet...

...

ANY change to the TB anywhere between the MAF screen and the throttle plate will alter MAF readings, thus altering MAF calibration, thus requiring a tune.

...

I expect an L67 TB swapped onto your L36 would run very crappy without the correct MAF calibration burned to your PCM.

I also have pictures and more quotes!
Quote:
Originally Posted by agrazela
Rear of TB filled with epoxy and sanded flat, to mate with L36 UIM and L36 TB style of gasket:

http://momentoffame.com/photopost/da...L67_TB_002.jpg


But make sure you do NOT fill in the PCV intake hole (unless you are running some sort of exotic breather setup)

http://momentoffame.com/photopost/da...hole_on_TB.JPG


(Here I drilled the epoxy back out after realizing I was stupid )

http://momentoffame.com/photopost/da...L67_TB_016.jpg


It'* harder to see in a pic than in person, but the L67 TB sits just a little low on the L36 UIM, and some of the bottom ridge of the L36 UIM inlet juts above the L67 TB throat:

http://momentoffame.com/photopost/da...L67_TB_005.jpg


So what I did was to drill out the three mounting holes 7/16":

http://momentoffame.com/photopost/da...L67_TB_006.jpg


Notch the back edges of the holes a bit to anchor some epoxy:

http://momentoffame.com/photopost/da...L67_TB_009.jpg

http://momentoffame.com/photopost/da...L67_TB_010.jpg


Then re-drilled the 6mm (or 1/4") mounting holes just a scooch (maybe 1/8"?) lower than they originally were:

http://momentoffame.com/photopost/da...L67_TB_011.jpg

http://momentoffame.com/photopost/da...L67_TB_012.jpg


So that the L67 TB outlet was centered better on the L36 UIM inlet:

http://momentoffame.com/photopost/da...L67_TB_014.jpg


The L67 TB increased MAP vs TPS, especially at low-to-midrange:

http://momentoffame.com/photopost/data/523/MAP_v_TP.JPG


(May explain why L67 is programmed to go into PE at ~25-30% TPS, rather than the ~45-50% IIRC of the L36)

And, properly tuned, increased VE throughout the powerband:

http://momentoffame.com/photopost/da.../L67TBVE_3.JPG


(How much of that was due to this TB being ported and polished and how much was JUST due to it being a larger-throated L67 TB, that I do not know; also, I did NOT have a wideband when I collected that data, so it may not be 100% as accurate as I'd like)

Now then, proper tuning for this involves not only starting with a stock L67 MAF table then doing the standard VE, fuel and spark tune business, but also lowering onset of PE (as mentioned) and fiddling with (well, increasing, of course!) the table that puts a limiter on the rate of MAF Hz increase.
Quote:
Originally Posted by agrazela
Quote:
can I swap my MAF screen, MAF sensor, IAC and TPS from 2004 SE (L36) to a bare 2000 L67 TB?
Yes, all that stuff will swap. You still need the L67 MAF calibration table in your PCM, though; the MAF sensor is the same, but the calibration is different because the TB around the sensor is different.
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