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I see/read alot about audi throttle bodies installed on rabbits.Does it really give you a better responce at the pedal.I checked out the position for the linkage and it is different.Should i pull off my old linkage and swap with the Audi part??Secondly the switch from a 60mm to 80mm in the CIS plates.I tried the 80mm and I had a really hard time getting it to stay running.I know there might be some adjust ments to make, but what is the best way.
 

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by itself (espcially w/ the sandwich style adapter plate setup which SUCKS) an oversize t/b might make the throttle response a bit better, but not much in the way of power gains...however, combine it with a match ported intake manifold opened up to the correct size (drill or dremel with a flexshaft and an asst of grinding stones works quite well, pick up a junkyard manifold or two and do it yourself) can make something like 8-10hp depending on other mods and the condition of your engine...you will definitely need to have your CO and idle reset after the install, but there's almost no downside- my car pulls much harder from idle to redline, revs faster and smoother, and seems to get a few more mpg on the highway..w/ the g grind and some headwork, it used to make power to about 6200-6500rpm then it was choking, now I have to keep an eye on the tach cos' it just keeps making power, at least to 7k, I don't push it past that if I can help it:) (i do have h/d valve springs to keep everything in check) if you junkyard everything, it's a great gain for few $$, good luck
 

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Re: (fat biker)

Quote, originally posted by fat biker »
8-10 horsepower?
Call me doubtful.
fat biker

call me another sceptic.
The bigger throttle body and ported manifold on my bunny make it feel faster because it has snappier throttle response but I seriously doubt there's any real power gain. At higher rpm a big 1.8 or 2.0 engine might gain a little bit but I wouldn't expect 10 or even 5 horsepower.
I wish I had a dyno...I'd test it and let you know!
jamie
 

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Re: (imaradiostar)

AMEN to the dyno.
If I ever come into a bunch of cash, a prominent feature of my dream garage will be a chassis dyno.
fat biker
Or, as somebody once said/wrote "just how big are those horses?"
 

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dunno, i dont think 10 bhp is out of line, translated to wheel hp its only 6-7, most of the places selling ported intakes/ t/b combos seem to be claiming similar power gains... could be a lucky combo of cam, headwork and intake working in unison nicely, but the difference in power on my 1.8L JH code motor was pretty impressive, much more top end power, due in part to the fact the the motor isnt choking for air at 6200rpm or so anymore....that being said, I agree a chassis dyno would be great .... all i can say is that it worked well for me, and only cost me about 50 bucks total, junkyard parts, grinding stones and all......anyone else have some input here? ( not that i'm doubting you two, fat biker I know you know your rabbits from reading your posts....but I swear , it made all the difference on my car, i did it about 3-4 weeks after throwing a ported head with a g grind on, so maybe it just unlocked some of the power there through better breathing...)
 

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maybe I need one of the tornado thingys for my intake...you know "turbocharge any car"...surely a plastic beanie prop stuck in my intake tubing is good for like.....50 hp? guess I'll need a 6ft high 2 level carbon fiber wing to add some downforce too, and soo stylish
now if I can only get these 24's to fit my rabbit hehehe (sorry I was feelin silly)
 

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Re: (joeymigraine)

hmmm...I put a tectonics sticker and a 311 sticker on my jetta and I swear I picked up 5 horsepower. I guess the new techtonics exhaust I installed at the same time had nothing to do with it...
Most likely you're right- given your other mods (especially if you've upgraded your exhaust manifold), a bigger throttle body will yield more power, especially at high rpm.
jamie
 

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wait till I loot the fast and furious rack down at ma' local pep boys for that 5" led lighted exhaust tip and some underbody neon, this baby'll fly like an eagle .....i'm off to go slalom under some tractor trailers, i saw in the movie so it must be ok:)
 

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btw yes, i do have a early rabbit dual outlet exhaust manifold and a tt downpipe, a umm, 'catalytic converter style' resonator , and a 2" techtonics exhaust....
 

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Re: (joeymigraine)

I've done it. I might have felt a little bit but more likely than not it was trying to justify the 10 buck upgrade. If you get 10 hp for the throttle body, 15 for a port job, 10 for a g-grind, 10 for twintube manifold and downtube, and 10 for a 2" exhaust, 15 for 2.5" exhaust then your car is faster than anything. That intake and throttle body are not that restrictive even with a better exhaust.
Techtonics used to sell a GTI 15 hp kit which was a g-grind cam, better exhaust and an adjustable cam. Techtonics claims are more real than many of these newsgroup claims. Now they have an A3 kit that does about 20 hp.
If you really want to see if it make a difference let someone else install the old one or the new one and let you take it for a drive. Let him put something els on or not. Do this a number of times and see if it really makes a difference. It is called blind testing where the driver has no knowledge of what has really been done. Or just take it to a chassis dyno for a few runs and $50.
Change a throttle body has no effect on mixture. No need to screw around with mixture screws. The mixture is affected by the flow of air and it measures that flow of air. If your throttle body flows more air it would compensate for that.
Quote, originally posted by joeymigraine »
dunno, i dont think 10 bhp is out of line, translated to wheel hp its only 6-7, most of the places selling ported intakes/ t/b combos seem to be claiming similar power gains... could be a lucky combo of cam, headwork and intake working in unison nicely, but the difference in power on my 1.8L JH code motor was pretty impressive, much more top end power, due in part to the fact the the motor isnt choking for air at 6200rpm or so anymore....that being said, I agree a chassis dyno would be great .... all i can say is that it worked well for me, and only cost me about 50 bucks total, junkyard parts, grinding stones and all......anyone else have some input here? ( not that i'm doubting you two, fat biker I know you know your rabbits from reading your posts....but I swear , it made all the difference on my car, i did it about 3-4 weeks after throwing a ported head with a g grind on, so maybe it just unlocked some of the power there through better breathing...)
 

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Changing the throttle body alone wouldnt require CO adjustment, but (at least in my case) it did need to be richened slightly after the bored out intake manifold was added.....i suppose it could have been out of adjustment prior to that, but I dont believe so......as I said I would imagine it was a cumulative effect of just the right combo of cam, head porting, intake porting, throttle body, and exhaust manifold and exhaust.... I had it dyno'd on the dynojet at EIP a few years ago,before the headwork and the manifold (just the G cam, airbox swiss cheesed on the side away from the engine, dual outlet US manifold, TT 2" exhaust (gutted cat) and neuspeed t/b (then I was using the stupid sandwich plate, I didnt know any better at the time) and at that time it made 98.1whp and 99.9 ft lbs 1st run and 96.6 whp and 101.4 ft lbs on run the 2nd run, this on a 97.3 degree day....I am pretty sure that the port/polish work and port matching on the intake/t-b/head/ added between 10-20 whp possibly more, bringing me to approx 110 whp, so maybe 125 flywheel? maybe I'll have to do some dyno runs soon, cash flow permitting.. anyway I wasn't trying to start an issue over real/percieved HP just give my impressions/experience with the ported mani/tb per the original question ...does anyone have some before/after dyno numbers for this they can post perhaps?
 
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