Mephis

I searched with the exact words as the topic, and if you posted STEP by STEP info on how to do it or a webiste that clearly explains, (in full words) how to do it, everyone would be very happy.

Sir Rupert Hobo

same here.

ilike2eatricers

http://fc3spro.com/TECH/HOWTO/TBM/tbm.html
This is for s4 though. Not sure what is different if anything.

Mephis

Sounds like an absolute waste of time to me, theres alot of stuff that will really mess up your engine in their, i would half to say, unless your a a good mechanic dont atempt this, the gain isnt worth it, and a header isnt expensive, and bolts up fast, any questions about a header and just email me. I have an auto so its harder for my to install a header.

NZConvertible

Sounds like you have no idea what you're talking about.
Ah, no...
It's not exactly rocket science.
Do you even know what the gains/benefits/downsides are?
What's header got to do with this?

ilike2eatricers

The gains of the TB mod are more noticable by the TII guys.

jacobcartmill

iTrader: (6)

what are the gains? i did this mod to my NA but it was mainly to get a cleaner look, i wasnt expecting many gains. now i have a turboII and i want to do it again.

what are the benefits to doing it? all i've heard is better throttle response

knightkarr

You do get a better throttle response, you also get more high end power. I've heard its one of those mods that the more stuff you have done to your car, the more you'll feel the mod, because what you are doing is letting the air flow better. I noticed that i had less lag and even improved my gas mileage

two cents

Carlos

knightkarr

one thing I forgot to add, while you have your UIM off, replace the vacuum lines since they are probably old and stiff. When i did my TBM i didn't do so and i couldn't figure out why my car was so gittery, but after the the vac. lines, everything went back to smooth again.

-Carlos

wai

I did it on my car a few months ago, it has a noticeable difference. my TB has been ported and removed all the stuffs , and it is not to hard to do.

NZConvertible

Only the Turbo will have improved throttle response, since only the Turbos have damped #2 secondary throttles. They open and close with the #1 secondaries, but they move slower. The improved throttle response is from the secondary ports effectively flowing earlier. The downside of this mod is a stumble if you stomp on the gas to quickly, which is what the damper was there to prevent in the first place. You quickly learn how to avoid it happening.

The #2's are also held closed until the engine warms up, to prevent to romping on a cold engine.

On an NA these throttles are wide open all the time (once the engine's warmed up), so there's nothing to be gained in throttle response from removing them. But even a fully open throttle causes a restriction (from turbulence it causes) so removing the #2 secondaries does free up a little bit of power.

Removal of the #2's also allows extensive porting to the inside of the TB. This I'm told provides a noticable performance increase to both NA's and Turbos.

The other part of the TB mod, the removal of the fast idle thermowax, is not something I did. My car's a daily driver, so I prefer that it can idle without my help no matter what.

The tidier look of the TB is a personal preference thing, but it is an improvement. It is of absolutely no consequence to a Turbo with the stock IC, since you can't see the TB anyway.

imloggedin

how much stumble do you get? and is it only when you SLAM the gas? cause thatd suck to be racing and you push the gas too hard and your cars jerkin down the road lol

rxse7en

Be prepared to use your foot to keep your engine running until it can hold idle on it's own.

dr0x

While the tb is out of the car you should port/polish the inside of it. Just take the tb mod to the next level. You may not beable to see the tb on a TII normally, but theres still less hoses and crap laying around when you go to work on it It usually only happens at low rpms and you jam the throttle wide open. When I did it, I had the car stumble like twice before I got used to it. Its not a big thing thats hard to avoid.

Icemark

The throttle body mod has no effect on warm idle at all.

If you have a problem with warm idle after the throttle body mod, the you have a vac leak or something adjusted wrong.

If you have an cold idle problem, then you have removed the cold start Cam or have other related problems.

HAILERS

******little bit of power********...... little, as in miniscule.

Neither of my turbo engines (used) came with the dashpot for the secondaries and I never noticed anything wrong in the area of *stumble* EXCEPT when the car hasn't reach operating temperature.

Hint: If you want to know just how the response will be after the throttle body modification...just back off or remove the dashpot for the secondary throttle plates. That simple act should give you an idea if you can live with the modification.

Just a note. I did buy a dashpot and cam from someone who did the throttle body mod, and installed it. I got a good fifteen miles of operation before the black cam shattered and jammed my throttle plates (pissant poor rigging on my part I think), but I got a hint of how a normal/stock throttle body feels. Someday I might buy someones old dashpot and cam and try it out again.