How-to Guide: Install Ported & Polished Throttle body - VTR

9th February 2008, 12:23

Right, thanks to spencer_cammedvts for this service, I got me a ported and mirrored-finished throttle body - a service he does for vts and vtr's.

Not a professional mechanic, I set about to compose this how-to as I had seen many people asking how easy/hard it was to fit them.

I must say - it is probably the easiest thing I have done to my VTR - alongside fitting an induction kit:

1. First thing to do is disconnect air filter/induction kit engine-side from the throttle body, you are left with something like this:

2. Then, undo the 3 x Torx screws as seen in the above pic, to remove the plastic casing surrounding the main body of the inlet:

3. With that off, Disconnect the sensor clipped into the back of the casing:

4. Carefully ply our the throttle cable, tiny bit fiddly, but when you do it once, you'll know how to do it again (you have to loosen the throttle, and cable needs to be pulled towards you and out):

5. The throttle inlet will then literally slide out, may need a tug, but it pops out easily. Once out, have a gander at the differences between the two

6. Slide the new one back in, reconnect the sensor and the throttle cable (not plugged in in this pic):

7. Re-screw the 3 x torx screws back on, and reconnect your filter/induction kit back on like so:

Done!. Now, I had a bit of bother for a while, as when I tried to engine, it revved on it's own to the redline. After a baffling my head, I put the old one back in, and it was fine, put the new one back in again and it worked fine, so if you get the same thing happen, take it apart and re-fit - maybe you missed something or throttle cable is not fit right.

Bobs your uncle, it's on. Haven't tried it out yet, but off out in a bit so will report the driving results. Spencer - the old one is on it's way back to you..

9th February 2008, 12:31

looks sweet mate, im sure it should make a bit of diffrence

good guide aswell bud

9th February 2008, 12:56

nice one mate. did it make a diffrence with the new one?

9th February 2008, 12:59

haven't tried it yet - but I'm just going out now, so I'll let you know when I get back in a bit

9th February 2008, 13:04

if it revs on its on after fitting it normally means there is a air leak, take it off and put a little sealent around the joining surfaces

9th February 2008, 15:07

Thats a good simple guide mate.Make sure you let us know if you feel a difference.

9th February 2008, 15:13

Just got back from Trafford Centre. I do prefer it, it seems to push the car that little extra. 1st gear is the most noticable, seems to move through rev counter more freely. I also noticed an improvement straight after going back on the accelerator after changing up a gear.

As ASDA put it: Every little helps.

9th February 2008, 15:14

Nice guide

An opinion on what difference a ported TB made would be appreciated also.

ManC

9th February 2008, 16:36

Quote:

Originally Posted by FILVTR

Just got back from Trafford Centre. I do prefer it, it seems to push the car that little extra. 1st gear is the most noticable, seems to move through rev counter more freely. I also noticed an improvement straight after going back on the accelerator after changing up a gear.

As ASDA put it: Every little helps.

Thought it was Tesco? Ce la vie.

Is it worth the 30 odd pounds in your opinion?

9th February 2008, 18:39

LOL Is that what people are selling as ported tbodie

It looks as if they have just cut half the spindle off and cleaned it. How much did it cost to get done? "port job" that is.

9th February 2008, 19:48

i did mine myself and compared to old one is MASSIVE improvement in bore size but that looks like a very tiny boring out job

11th February 2008, 08:14

Prob just angle it was taken. Side-by-side in real-life - you could see the difference, screws taken down, black plastic bar removed, widened and bored quite a bit compared to standard. Far more response through rev range. Worth £30 for sure..

11th February 2008, 08:31

no disrespect, but i see that as a waste of time and money. the size of the butterfly isnt actually increasing so how can it flow more air.
and i dnt know if u knew but a larger throttle bodie will make it jumpy at low revs.And with the slower moving air goin into the engine from the larger bore t/b u could actually loose low end power, which is not good for a vtr

11th February 2008, 09:46

It's not about increasing the size of the butterfly, it's about smoothing the butterfly and surrounding areas (by polishing) so air 'slides' past it more smoothly thus gas flow is increased. It's mainly to remove any small restricitions (lip, casting marks etc). It's not like you're doubling the size of it, just simply aiding the flow of air.

It's a 'port and polish' not a 'bigger and ... '

and unless you've tried one or clearly know anything about what this is - how are you going to know for sure..?

I don't think the people that have these fitted would all 'coincidentally' lie to you - if it was pointless, I don't think people would recommend them as much as they do... see the previous posts on these. People do say it will not increase power, but throttle response is greatly improved and you can feel it.

And judging by your rep and experience in posts, you clearly are the person to listen to (!)

11th February 2008, 09:55

Good guide mate, Another job I now know how to do

12th February 2008, 12:33

Can we get this thread stuck at the top?

12th February 2008, 20:27

Quote:

Originally Posted by reg_the_geza

no disrespect, but i see that as a waste of time and money. the size of the butterfly isnt actually increasing so how can it flow more air.
and i dnt know if u knew but a larger throttle bodie will make it jumpy at low revs.And with the slower moving air goin into the engine from the larger bore t/b u could actually loose low end power, which is not good for a vtr

yer there isnt a bigger butterfly being fitted but you still get gains from flowing a cylinder head without putting bigger valves in!. . . same thing!

15th February 2008, 00:06

where did you get the t/b from m8?

15th February 2008, 00:06

O and btw, brill thread!

15th February 2008, 00:45

Quote:

Originally Posted by AliC

where did you get the t/b from m8?

spencer_cammedvts does them fella.

15th February 2008, 08:20

Quote:

Originally Posted by reg_the_geza

no disrespect, but i see that as a waste of time and money. the size of the butterfly isnt actually increasing so how can it flow more air.
and i dnt know if u knew but a larger throttle bodie will make it jumpy at low revs.And with the slower moving air goin into the engine from the larger bore t/b u could actually loose low end power, which is not good for a vtr

very true

15th February 2008, 08:24

Quote:

Originally Posted by FILVTR

It's not about increasing the size of the butterfly, it's about smoothing the butterfly and surrounding areas (by polishing) so air 'slides' past it more smoothly thus gas flow is increased. It's mainly to remove any small restricitions (lip, casting marks etc). It's not like you're doubling the size of it, just simply aiding the flow of air.

It does not work like that. polish does not aid air flow. Polish is bad as the air wants to stick to it and not flow over. A mat finish is far better for air flow. A true ported body will be bored and have a larger butterfly fitted.

15th February 2008, 08:28

Quote:

Originally Posted by FILVTR

I don't think the people that have these fitted would all 'coincidentally' lie to you - if it was pointless, I don't think people would recommend them as much as they do... see the previous posts on these. People do say it will not increase power, but throttle response is greatly improved and you can feel it.

More often than not that is so. People with fat HT leads or eko valves and that sort of thing all rave about how great they are. Thats is not to say your mod is such a mod. But the odds of it doing much at all are very slim. Just look at the people who fit S1 rally inlets. Its a MUCH better inlet and does not really show any gain on a stock engine. Its not till you stick wild cams that it helps at all.

16th February 2008, 13:28

Quote:

Originally Posted by AXracing

More often than not that is so. People with fat HT leads or eko valves and that sort of thing all rave about how great they are. Thats is not to say your mod is such a mod. But the odds of it doing much at all are very slim. Just look at the people who fit S1 rally inlets. Its a MUCH better inlet and does not really show any gain on a stock engine. Its not till you stick wild cams that it helps at all.

That's next on the list for me...

17th February 2008, 21:51

been lookin for one of these

20th February 2008, 08:26

Quote:

Originally Posted by AXracing

It does not work like that. polish does not aid air flow. Polish is bad as the air wants to stick to it and not flow over. A mat finish is far better for air flow. A true ported body will be bored and have a larger butterfly fitted.

the air only sticks to a mirrored surface once it is mixed with fuel. if its just plain air it doesnt stick at all. this is why its not polished when running a 5th injector.

also you dont need to make the butterfly bigger! you dont neccessarily put bigger valves in when you gasflow a head but still get good gains from it.

the standard throttlebody is fine on a standard car but as you start pmodding the engine the throttlebody becomes more of a restriction so flowing it makes more of a difference. i.e. you see more of a difference on a cammed vts than you would a standard vts...