L67 Throttle Body Improvements - Page 3 - 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 08-18-2006, 04:10 PM   #21
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Quote:
Originally Posted by SSEimatt93
I WANNA PLAY I WANNA PLAY I WANNA PLAY
How much $$$ u want? lol
More HP, more gains..make me
x2 very interested!!
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Old 08-18-2006, 04:11 PM   #22
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Old 08-18-2006, 04:24 PM   #23
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Guys.. Print out the info Wren posted..

Take your TB off and bring it to a machine shop...they shouldn't have any issues at all doing the work fairly low cost.
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Old 08-18-2006, 04:27 PM   #24
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Quote:
Originally Posted by BillBoost37
Guys.. Print out the info Wren posted..

Take your TB off and bring it to a machine shop...they shouldn't have any issues at all doing the work fairly low cost.
i have a friend that is the Formen of a machine shop here in walworth, NY..... tempting....
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Old 08-18-2006, 06:57 PM   #25
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FYI, the TB I ported for Boost was NOT a 99. I know the difference. It was a 96-98 S2 L67 TB.

His gains were not from the different type, they were from the modifications made to it.
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Old 08-18-2006, 07:55 PM   #26
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Quote:
Originally Posted by willwren
FYI, the TB I ported for Boost was NOT a 99. I know the difference. It was a 96-98 S2 L67 TB.

His gains were not from the different type, they were from the modifications made to it.
As noted...the difference is noticable. We've narrowed it to 96-98...and Don has a good point in this post from earlier in the thread.. 96 or early 97 with 4T60 is on the mark.

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Originally Posted by jr's3800
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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Old 08-18-2006, 08:03 PM   #27
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Bill, you mentioned on the phone that the PCM was starting to re-learn the TB. It should adjust the fueling UP to compensate, so the learning should still net you the gain, and then some, as the PCM learns how to fuel the new flow.
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Old 08-19-2006, 01:21 AM   #28
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Been so busy with my additions and new wood burning furnace going in. What would you like to do to my TB, Mr Wren? Are you porting them yourself now? I'm scared, very, very scared. Boosty does your butt really feel a difference? I seen that butt in an earlier meet pic. If it feels "moved" ... there must be a Hp improvement. I have been on the fence with this one for some time and keep wondering if there is any real improvement. Will do you really think the N* PCM will adjust to flow.... it seems to learn everything else.Since i'm not driving but around the Lake area,... maybe I could be a guinea pig.
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Old 08-19-2006, 02:28 AM   #29
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Boosty, you did two mods
So how do you know how much can be attributed to the TB porting/mods or to the removal of the MAF screen

The observations you related were my exact observations when I simply removed my MAF screen.

I have no doubt that the TB mods will make a difference but only after the air fuel ratio re-learning. Every little bit of efficiency improvement makes a difference.
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Old 08-19-2006, 04:12 AM   #30
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We talked a bit about that earlier today, Paul. MAF screen is something he'* going to play with. But the good news is that he has 'before' scans. So he may be able to determine what does what.

Based on Don'* observations with his L36 TB, though, I think it'* safe to say there'* a significant noticable gain, despite the MAF screen.

John, can you find a core? eBay perhaps? I have a shortstar TB on the way already. So far I've done:

L27
L67 S1 (both gens)
L67 S2
L36
and a shortstar soon. I'd like to cover all the bases.
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