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Old July 25th, 2009, 08:15 PM   #1
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Boring the throttle body?

Does anyone know the process of boring the throttle body in our cars? a friend of mine is willing to do it if i can give him some info on the process.
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Old July 25th, 2009, 11:32 PM   #2
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If you're friend needs instructions on how to go about porting & polishing if I was in your shoes I'd say no thanks; it just doesn't sound like a very confident offer to help. P&P is the same process just different smells depending on what your working on. You may as well learn it yourself since for a throttle body its easy enough for anyone to do at home if you're only looking to make a minor improvements.

I've done this before on another car. The at home way of porting and polishing I picked up doesn't involve replacing the brass valve door just porting and polishing the throttle body on both sides.

Remove any bits of electronics or anything else you can from the throttle body that may hide filings. Also tape off any areas that may have metal fillings fall into. Mark the amount of material you're going to grind off with a marker. I used a drill with different levels of grinding wheels to grind the bulk of the material off. Then switch to varying grades of steel wool and/or sandpaper until you have a smooth finish. Keep your grinding as consistent as possible so the walls are smooth not lumpy. Just take your time and remove the material slowly.

This mod does increase throttle response in most cars. The main concern is you don't want to take too much out of the throttle body or the walls become weak or too thin to be practical. Also the metal filings can get into everything so be sure to wash the throttle body thoroughly after your finished.

If you're looking for a more full porting/polishing job you should be looking to have the brass valve replaced in addition so the ends of the throttle body are straight through not flared like what'll happen with my at home method. I highly recommend having a good shop do that job for you.
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Old July 26th, 2009, 12:16 AM   #3
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If you decided to not have your friend do it I had it done by P2R they did a great job on mine IMO.
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Old July 26th, 2009, 10:28 AM   #4
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Originally Posted by nadracer View Post
If you're friend needs instructions on how to go about porting & polishing if I was in your shoes I'd say no thanks; it just doesn't sound like a very confident offer to help.

If you're looking for a more full porting/polishing job you should be looking to have the brass valve replaced in addition so the ends of the throttle body are straight through not flared like what'll happen with my at home method. I highly recommend having a good shop do that job for you.
My buddy has no problem boring it out he works in a machine shop, he just doesnt know (and i dont either)if he has to remove the valve, or other parts before doing and also if he has to match the bore with maybe the intake?
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Old July 26th, 2009, 11:20 AM   #5
hmmm what next?
 
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i would do an intake match if it needs it.
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Old July 26th, 2009, 11:42 AM   #6
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you have to remover all the sensors, and the butterfly, if you want to bore out the TB As for port and polishing of the head you need to remove everything and hot tank it. Then PNP it then hot tank it again
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Old July 31st, 2009, 12:10 PM   #7
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Any idea of performance gains from this?
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Old July 31st, 2009, 08:34 PM   #8
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Any idea of performance gains from this?
maybe a pony or two but more importantly better response and some more gain at the top end
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Old August 7th, 2009, 07:24 PM   #9
The End.
 
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whoops 7th gen section.
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Old August 7th, 2009, 08:30 PM   #10
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Originally Posted by 7thgencordcoupe View Post
If you decided to not have your friend do it I had it done by P2R they did a great job on mine IMO.

how much they charge, including shipping back to you?
What do they do? for example: remove all sensors, sand blast, hot tank, replace butterfly?
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