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Old 02-05-2006, 02:51 AM   #1
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Question about throttle body sizes

I want to replace my stock tb and my question is how large can i go with out having to change my 19lb injectors? I heard from others but im not sure of their answers. Im thinking like a 65mm or 70mm.

thanks
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Old 02-05-2006, 09:39 AM   #2
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Re: Question about throttle body sizes

what modifications do you have done to your car? anything that would really support the larger injectors? have anything planned for the future? 65 MM should be fine for your stock injectors while still improving airflow, but if you plan to seriously upgrade in the future you could aim for larger.. just remember new injectors require a mass air calibrated to the injectors.
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Old 02-05-2006, 09:47 AM   #3
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Re: Question about throttle body sizes

is your car MAF or speed density?
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Old 02-05-2006, 11:09 AM   #4
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Re: Question about throttle body sizes

Quote:
Originally Posted by Jrw4482
I want to replace my stock tb and my question is how large can i go with out having to change my 19lb injectors? I heard from others but im not sure of their answers. Im thinking like a 65mm or 70mm.

thanks
On a stock 5.0 I would get a 65mm. The 70mm would only be if you had aftermarket heads and cam.
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Old 02-05-2006, 03:34 PM   #5
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Re: Question about throttle body sizes

Quote:
Originally Posted by MonteCitan
what modifications do you have done to your car? anything that would really support the larger injectors? have anything planned for the future? 65 MM should be fine for your stock injectors while still improving airflow, but if you plan to seriously upgrade in the future you could aim for larger.. just remember new injectors require a mass air calibrated to the injectors.
Nothing major, just a mass air meter and K&N filter.I plan to get a new intake,cam, and heads, but not in the near future. Ya i know about the calibrating for the mass air.


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is your car MAF or speed density?
MAF

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Originally Posted by Danger Dude
On a stock 5.0 I would get a 65mm. The 70mm would only be if you had aftermarket heads and cam.
I was leaning towards the 65mm. Would a 70mm just be a waste on my current setup? Pretty much stock expect for C&L 76mm mass air meter calibrated for my 19lb injectors and their "truefow" intake pipe, aswell as a K&N filter.
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Old 02-05-2006, 03:36 PM   #6
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Re: Question about throttle body sizes

yeah, 65 mm throttle body won't hurt anything, you won't notice too much gain however, perhaps increased throttle response
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Old 02-26-2006, 03:09 AM   #7
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Re: Question about throttle body sizes

IMO not worth it at this stage of the game put it towards gears or a shifter youll love those.
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Old 02-27-2006, 03:07 PM   #8
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Re: Question about throttle body sizes

I have a 70mm, but my car has mild motor mods...
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Old 02-27-2006, 04:37 PM   #9
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Re: Question about throttle body sizes

go Pro-M NOT C&L ask bbunt302 about C&L vs Pro-M

it sucks to cus C&L is local to me lol
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Old 02-27-2006, 05:13 PM   #10
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Re: Question about throttle body sizes

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Originally Posted by SpectorV
go Pro-M NOT C&L ask bbunt302 about C&L vs Pro-M

it sucks to cus C&L is local to me lol
I believe he said he already had a C&L if you read his above post closer!!!!
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Old 02-27-2006, 05:22 PM   #11
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Re: Question about throttle body sizes

Plus Pro-M is now out of business.

I believe someone has taken over there operations though (not sure who). Still, it's sad that a company with products like C&L can stay afloat while a place like Pro-M sinks.

Anyway, don't go bigger than a 65mm w/ the stock intake. Also like Matt said, you may want to put off the TB for now and look at more effective mods like gears, shifter, U/D pullies, etc. With stock H/C/I, you are going to see very little added power from a TB, perhaps a slightly better throttle response.
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