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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 04-16-2009, 10:19 AM   #1
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Default anyone upgrade tb

just wondering how many people have modified or upgraded there tb i know i dont need to know im considering porting it but only cuz the rest of the intake is coming out the summer anyways info i searched btw and didnt get anyhting useful back
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Old 04-16-2009, 11:15 AM   #2
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Lots of folks have..

L36 folks frequently toss on an L67 TB.

The L67 folks.. we have lots of options from ported, LS1, N*..you name it.
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Old 04-16-2009, 12:41 PM   #3
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Keep in mind that if your changing your TB to a larger one, you will need to have access to a tuner to change the tables.
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Old 04-17-2009, 12:37 AM   #4
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i guess i just ment porting/ massaging mine i dont want to do a retune for it .. yet just clean the flow up a bit dont know if its worth it or possible
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Old 04-17-2009, 12:57 AM   #5
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Average rebore runs $100-150. And 4-6 % average HP gain if it'* a standalone mod. You will see alot of outlandish claims on the internet. Like saying HP gains up to **%. It'* a hat trick. Sure on a 1000HP engone it gives 20 HP, but to a 250... thats 5HP. Thats just as an example. And I heard of alot of them being screwed up. I dont think it'* worth the bother unless your looking to shave a 10th of a second of a track time.
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Old 04-17-2009, 07:17 PM   #6
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Hey Dan..
If a car is MAS equipped you can change alot before flashing the computer. Generally speaking, all of my MAS equipped Mustang and F-body friends changed rockers, cams, MAS size, Exhaust, TB size.. The list goes on. If the car was speed density equipped then you had to upgrade convert to MAS and everything is fine. Are these cars different? I trust what you say since you are the man in regards to these cars/engines.

Thanks,
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Old 04-17-2009, 07:25 PM   #7
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The PCM can compensate to a point but changing the TB would require some tweaks to the MAF table. MAS is not something I'm familure with, sorry.
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Old 04-17-2009, 07:29 PM   #8
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Sorry me and my terminology.. Mass Air Sensor.. same as a Mas Air Flow .. My bad..Thats why I'm not a tech, thanks as always Dan
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Old 04-17-2009, 10:59 PM   #9
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A polished throttle body flows more than an OE throttle body, but the MAF reading is the same because the MAF doesn't account for the lost turbulence (smooth flow along the inside).

My 99 went from the Series 2 upper intake manifold and throttle body to a Series 3 UIM and a Series 2 supercharged 3800 throttle body. It absolutely had to be re-tuned because otherwise it ran insanely lean on the stock tables. I think it'* a generally nice mod because the manifold tapers down and has an oval air entry. Some out there are pretty confused about the benefits, especially given that GM changed its HP rating for emissions reasons for the Series 3, but the aluminum UIM actually tested to provide more volumetric efficiency and therefore more power.

You may not have access to a tuner, but you only need to have someone throw on the appropriate MAF tables to get your car running with a larger throttle body. Whether you run with a larger throttle body because you have changed the UIM or because you feel like it and yet have everything else stock, please make sure to get the car re-tuned no matter how you change the throttle body.
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Old 04-17-2009, 11:58 PM   #10
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ya know thats true even a "polish" would basically do the same thing as if i bored it it couldnt meter the air that went though lol thats why i love brainstorming. im saving up to one day get the tuner set up unless someone in the south east wants to help a brother out
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