Throttle body tuning

The compi is not a rocket on the street, but there are many ways to rise to power of the car.

One of them, is changing and tweaking the throttle body.

This is the compi throttle body



As you can see, the smaller flap is obstructed, and this is blocking the air going trought the throttle.

This is the 2.3 10v (NG) throttle body



The difference is already huge. You can just replace the throttle body and go drive around. You will notice a big difference already.

If you have patience and want to do some more, you can start grinding the throttle body:

tools needed:





smooth the inner line and the outer edge:



the center pillar need to be rasor sharp too:





the outer edge needs to be razor-sharp too



the rear end needs to be tweaked too:

you can see the line of the line of the intake manifold:



mark it with a sharp edge:



then start grinding

grind untill you reach something like this:

Would be wonderful to see all the pictures that are unavailable atm, do you still have them somewhere?

i think thise are the missing pics:











this mod is awesome btw. a must for every compi driver...

This is a really interesting mod.. How much power do you think you gain by that? Skull do you think that this could be done to an ADA engine? Also is there anything else you believe that could be done to improve the ADA (e.g. the gearbox that is really crap) ?

thanks mate and keep up the good work..

yes it could be done also on the ada engine, but you have to use the 5 cylinder 20v throttle body. i cant tell how many hp would you gain, but everything there is is welcome...

some friends had similar problems with the crappy 1.6 101hp engine, and they used the abk gearbox, and said that is was much better for driving.

Thanks for the quick answer.. You mean the ABY engine?
Surely you can't tell me how many hp, bad question, but I mean that the difference is noticeable, isn't it?

the throttle body must be from a 2.0 20v or 2.3 20v engine, the aby throttle body is totally different.

the difference in power is very noticeable, it is like having one passenger less in the car, and i still have to remove the catalitic converter, which has the smaller pipe diameter 50, everyi thing else is diameter 60. so it will give at least some 5hp.

And why is that? I mean what is the difference between the ACE and ADA throttle bodys types and the 10v and 20v engines? Just curiosity..
The ADA is 8v as you already know..
Skull spread the knowledge...

ok, so this is the 16v throttle body



this is the 5 cylinder throttle body



You can clearly see the difference, the small throttle is very restricted in the 16v throttle body, which gives less total air flow.

how does the ADA throttle body look like?

I understand that.. My question was why you suggested me to use the throttle body from an 20v engine, while you had used a 10v one.. for that different I'm talking about..
I haven't removed my throttle body yet so I don't have a pic yet..

aha the 10v and 20v TB`s are practically the same

So would something like this do the job?
http://cgi.ebay.co.uk/AUDI-COUPE-90-2-3-20V-7A-THROTTLE-PRETENTIONER-/230588114429?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35b01f65fd

no, this is not the right throttle body.

http://cgi.ebay.de/Drosselklappe-AUDI-A6-4A-C4-06-1994-02-1997-2-3-/150523547057?pt=Autoteile_Zubeh%C3%B6r&hash=item230be70db1

http://cgi.ebay.de/Audi-80-90-100-Drosselklappe-2-3l-NG-AAR-NF-054133063AB-/310291220093?pt=Autoteile_Zubeh%C3%B6r&hash=item483ecc467d

http://cgi.ebay.de/Audi-80-100-2-3-NG-NF-Drosselklappe-Poti-162054063D-/390280206407?pt=Autoteile_Zubeh%C3%B6r&hash=item5ade835847

Back again!
At last I found a throttle body from a NG motor at the local scrap for 70e, so tomorrow I was of putting it on.

So Skull, before I take the big step I have one last question (sorry for asking over and over but, I'm a student so the 70 means to me ) have you faced any problems running on idle or any general instability on rpm? I'm just asking because I can't understand how engine manages the extra air if the ECU does't know and is ratio of mixture right?

thanks in advance for once more

Vark wrote:Back again!
At last I found a throttle body from a NG motor at the local scrap for 70e, so tomorrow I was of putting it on.

So Skull, before I take the big step I have one last question (sorry for asking over and over but, I'm a student so the 70 means to me ) have you faced any problems running on idle or any general instability on rpm? I'm just asking because I can't understand how engine manages the extra air if the ECU does't know and is ratio of mixture right?

thanks in advance for once more

That's why you have a oxygen sensor(lambda). It measures the Air/fuel ratio and gives signal to the ECU ECU regulates then the amont of fuel. I've seen this been done on some other cars, and it worked just fine. I think you will notice the engine revs faster with this mod.

no problems with the ng throttle body.

the other fun thing is, that the ace has a potentiometer, the ng only have the minimum (idle) switch and the full throttle switch, but still the engine runs perfectly without the potentiometer...

$küll wrote:no problems with the ng throttle body.

the other fun thing is, that the ace has a potentiometer, the ng only have the minimum (idle) switch and the full throttle switch, but still the engine runs perfectly without the potentiometer...

TPS (throttle position sensor)? Now thats weird. On newer engines the ECU will go into emergency mode if the TPS doesn't work properly. I don't know with the ACE-ECU. Have you checked your AFR?

what is AFR?

$küll wrote:what is AFR?

Sorry, I'm used to short terms..

Air-fuel ratio (AFR)

Maby you can read the values with VAG-COM.

aha, no i didnt check, but the car is going really well. both HP an NM raised very much from stock with all the mods i have made. maybe is should add some fuel to the mixture, i had the MOT (technical check @ registration) last week, and the co2 readings were a little high, but it passed even with the sport cat.

hi,today im to change throttle with im I bought fore 8 euro and what you now is fill the difference in power ,(but sometimes feel that funds mixture ) it is like having one passenger less in the car,im use throttle from 2.3 20v 7a engine his better is hawe idle which can be adjusted manual and potentiometer ,speciali when original idle stuck, and my idling from 1500-2000rpm

this is smal mod
without the walls of the throttle, and the pedal was more sensitive .

good job!

Hi everyone!
I tried this throttle body mod today. I replaced the ACE's tb to the NG's tb.
Idle speed raised to 2000 rpm and when i took test drive idling was around 3000 rpm. When i unplugged the ISV connector idling was about 1500 rpm.
I think the problem is the lacking of potentiometer? I also have 7a's tb, I didin't try it because the potentiometers connector is two pin connector and ACE's is three.
I'm sorry for the bad english but ask if you didin't understand

hello.

it is certainly not an issue of the potentiometer, because i tried 2 different 5cyl throttle bodies, and the engine runs perfectly with both of them.

the only problem i can think of is some air leak, maybe you didnt connect the pipe that goes to the throttle body, or maybe the most plausible one, that you have a screw in your throttle body, that the NG engine uses to set the idle.

you can see where the idle screw is on this pic, on the rights side, it is in the upper aluminium pipe: