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Yep, inside diameter.
What about the throttle body? Haaaiii
Oh I'm not going to bother with that.
That's interesting. As far as I was aware mine had not been modified either. The 197 boys have a thread about having theirs bored out to 64 so I just assumed that if they were running 60mm the 172s wouldn't be any bigger.
Is anybody running a 172 with a60mm TB?
Ph1 172, Leon cupra
So it's possible 182's have slightly smaller tb's? Ph1 is cable operated and 64mm I/d. Maybe your cup one has been bored out at some point? Wouldn't have guessed that they were different from 172ph2-182....
Is it a noticeable/worthwhile difference going to 64mm on the 197's?
Is it a noticeable/worthwhile difference going to 64mm on the 197's?
Ph1 172, Leon cupra
Just a thought....assuming it is correct that, as standard, 172's are 64mm and 182/197 are 60mm- it may be related to the difference in engine breathing from the exhaust manifold characteristics.
I have no idea what manifold 197 are (but guessing 4-2-1??) 182 also being 4-2-1 and the 172 being 4-1. So a smaller tb would flow better (due to increased air speed through smaller bore) in the low-midrange on the 182/197 which is also true for 4-2-1 exhaust manifold. And the larger (64mm) flowing better higher up the range (172) which matches the behaviour of a 4-1 exhaust manifold.
All guess work of course, but seems plausible?!
I have no idea what manifold 197 are (but guessing 4-2-1??) 182 also being 4-2-1 and the 172 being 4-1. So a smaller tb would flow better (due to increased air speed through smaller bore) in the low-midrange on the 182/197 which is also true for 4-2-1 exhaust manifold. And the larger (64mm) flowing better higher up the range (172) which matches the behaviour of a 4-1 exhaust manifold.
All guess work of course, but seems plausible?!
172 Ph1
I had my Ph1 throttle body enlarged and I'm not sure of the size standard , mine was enlarged by 4mm , so when I get a chance I'll measure it and feed back
Evo 8 MR
I thought this tbh.
Golf GTD Mk7
Standard is fine. All 1*2 are 60mm butterfly. I run 64mm and the difference is very minimal. I think I lost mid range to be honest
LY R27
197s produce a convenient 199kg of pollution (what ever the units are), if they were running 200, they would be in the next tax bracket, this is measured always at around 3k RPM, so conveniently the 197 produces a huge flat spot at 3k RPM! Adding a bored out TB smoothes this away - a lot!
It is a really noticable change and the boys running more modified 197s say that it brings all the mods together, at the end of the day no point making the car breath any better (r3 airbox, silicone hoses, matched inlets if in the middle you are going to restrict it slightly!
Bigger the Venturi the greater the airflow (unless too big then the opposite will actually choke the engine of too much air to fuel.
So yeh to answer the questions above, a huge difference. And "LEWVR6" i guess you are along the correct lines, the 197 does run a 4-2-1 manifold, though it is a pretty much redesigned version of the f4r, though the same engine, tweaked to help subtle differences so not like the 1*2s where they wanted "more power" from the original engine {(172 - 182)
And finally, (I know essay!) yes my TB was directly off of a 182 FF, but then bored out the extra 4mm, exactly the same TB otherwise (tested prior to boring out)
It is a really noticable change and the boys running more modified 197s say that it brings all the mods together, at the end of the day no point making the car breath any better (r3 airbox, silicone hoses, matched inlets if in the middle you are going to restrict it slightly!
Bigger the Venturi the greater the airflow (unless too big then the opposite will actually choke the engine of too much air to fuel.
So yeh to answer the questions above, a huge difference. And "LEWVR6" i guess you are along the correct lines, the 197 does run a 4-2-1 manifold, though it is a pretty much redesigned version of the f4r, though the same engine, tweaked to help subtle differences so not like the 1*2s where they wanted "more power" from the original engine {(172 - 182)
And finally, (I know essay!) yes my TB was directly off of a 182 FF, but then bored out the extra 4mm, exactly the same TB otherwise (tested prior to boring out)
Golf GTD Mk7
Not if you measure the disc. Electronic are 60mm
172
yes that is the dics but if you think about it the inner of the body has to be larger as if it were the same size it would not open smoothly and would be a tight fit.. i assume dan was on about the actual body bore as apposed to the butterfly
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remember the opening is tapered down to the butterfly
James stone had over 200bhp on a standard one, how much more power than that are you running for you to think its a restriction to you?
The standard Inlet manifold is WAY more restrictive than the body, it hits max airflow log before it hits max throttle angle, there is nothing to gain, people saying otherwise just want to believe it because they have spent some money on it.
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