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68mm Throttle body - RESULTS!!! 

 

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 Post subject: 68mm Throttle body - RESULTS!!!
Posted: Thu Nov 13, 2008 1:31 pm 
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I finally got around to getting my car put back on the dyno after getting my TB bored out.

on the standard 64mm throttle body i made 143 rwkw @ 4900 rpm
on the 68mm throttle body i made 152 rwkw @ 5400 rpm


power curve from 4900 rpm and below was exactly the same
torque curve from 4900 rpm and below was exactly the same

it was only after 4900 rpm that things changed....
i hope that puts alot of the debating about throttle body size on an NA6 car to sleep!

 

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Posted: Thu Nov 13, 2008 2:03 pm 
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so where do i get my hands on a 68mm t/b? a 9 kw difference is a very nice increase!
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Posted: Thu Nov 13, 2008 2:26 pm 
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remembering that without many other mods.. there are far more better things to do... the throttle body mod will have the most gain on an allready worked engine... -good result there vince...

 

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Posted: Thu Nov 13, 2008 3:54 pm 
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Can you feel any difference though?

 

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Posted: Thu Nov 13, 2008 5:24 pm 
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Nice! *Adds TB to list*
Where can you get this done? Cost much?

 

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Posted: Fri Nov 14, 2008 7:53 am 
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well as i said there is no difference below 4900, instead of dying off it keeps on climbing till redline. you cant feel it in 1st or 2nd gear because the engine just revs way too quick to feel it, in third you can, but at that stage your doing about 130-150 clicks and its time to slow down! perfect for the 1/4 mile or dyno though.. no real difference on the street.


one other observation, there was no difference running the 3inch intake pipe compared to no intake and just an exposed throttle body..

 

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Posted: Fri Nov 14, 2008 8:02 am 
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FAST-XR wrote:
one other observation, there was no difference running the 3inch intake pipe compared to no intake and just an exposed throttle body..


Maybe not on a dyno where the bonnet is open and you're not dealing with an enclosed space filled with hot air :P
close the bonnet and get the car upto a decent temp and see the difference :P

nice result on the t/b!

 

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Posted: Fri Nov 14, 2008 8:24 am 
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good point, but i was coming more from the point of the intake pipe being a restriction on the engine

 

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Posted: Fri Nov 14, 2008 8:39 am 
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You've also got a variable in that the two set-ups were not tested on the same dyno on the same day.

 

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Posted: Fri Nov 14, 2008 8:43 am 
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the throttle bodys were compared months apart that is true, but the graphs were spot on from 4900 and below.

if anything, the run with the new TB was done on a hot engine, and the old run was on a cool engine...

the runs with the intake on and off were both done yesterday...

 

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Posted: Fri Nov 14, 2008 8:47 am 
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very good result, as above what was it worth to do the TB?

cheers

 

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Posted: Fri Nov 14, 2008 8:48 am 
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so how did you get it bored out and did you need a new butterfly ?

 

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Posted: Fri Nov 14, 2008 1:19 pm 
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cheers for the info
i have bored out my tb with a dremel and 120 grit tubes,
you are pretty safe as long as you keep the butterfly firmly closed.
stick some blue tack in the valve aswell
i was suprised at the extra sound and responsivness
especially at the points you have describd
definate worthwhile mod
i also had noticable increase from matching surfaces of tb & bbm
and deburing,porting and 120/80 grit rough surfacing the top half of the bbm
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Posted: Fri Nov 14, 2008 1:37 pm 
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sounds like you have polished the bore without increasing the diameter of the butterfly. i got a new butterfly and TB professionally machined out, didnt cost me too much because it was a mate of mine.

seems like there is a bit of interest in getting some made up, ill look into it and get a price for those that are interested, it would have to be on an exchange basis with your existing TB though


it takes about an hour to machine, plus material, machine cutters,etc, and there is a bit of fitment work to be done to get the new butterfly to fit into the existing shaft. id say about $150, but ill have to confirm this. that seems reasonable compared to the $300 ones that get sold on ebay. how does that sound?

 

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Posted: Fri Nov 14, 2008 2:05 pm 
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FAST-XR wrote:
sounds like you have polished the bore without increasing the diameter of the butterfly. i got a new butterfly and TB professionally machined out, didnt cost me too much because it was a mate of mine.

seems like there is a bit of interest in getting some made up, ill look into it and get a price for those that are interested, it would have to be on an exchange basis with your existing TB though


it takes about an hour to machine, plus material, machine cutters,etc, and there is a bit of fitment work to be done to get the new butterfly to fit into the existing shaft. id say about $150, but ill have to confirm this. that seems reasonable compared to the $300 ones that get sold on ebay. how does that sound?
vince... $150 is very reasonable.. i see "big throttle body's on ebay at twice that price... -the beginings of another group buy perhaps??

 

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