More air means more power

[Rob669]

I was told this before and now I really believe it. If you've got a 172 ph 1, I suggest you try removing the two standard cold air feeds and replace them with much bigger cold air feeds (like on mine in the photo). I did this at the weekend and it seems like a much bigger power gain compared to having the inlets improved.

My thanks to someone else on here who suggested it.

Rob669

 

[franx]

nice one , definately going to try this .

By the way, can this phase 1 box be used on a Phase 2 ??

(Acousic valve problem?)

 

[bmh.01]

nice one , definately going to try this .

By the way, can this phase 1 box be used on a Phase 2 ??

(Acousic valve problem?)

Acoustic valve comes out and yes it can be used no problem. Ph1 airbox with an ITG filter is probably the best induction setup tbh.

 

[franx]

nice one , definately going to try this .

By the way, can this phase 1 box be used on a Phase 2 ??

(Acousic valve problem?)

Acoustic valve comes out and yes it can be used no problem. Ph1 airbox with an ITG filter is probably the best induction setup tbh.

.. nice affordable mod !

 

[Bluebeard]

http://www.cliosport.net/forum/showthread.php?t=268293

A shameless plug from me...

 

[Rob669]

You're welcome. Hope it sells.

Rob669

 

[ChrisR]

I was told this before and now I really believe it. If you've got a 172 ph 1, I suggest you try removing the two standard cold air feeds and replace them with much bigger cold air feeds (like on mine in the photo). I did this at the weekend and it seems like a much bigger power gain compared to having the inlets improved.

My thanks to someone else on here who suggested it.

Rob669

How much time did it take to do? And do you fancy helping do another one?

 

[Rob669]

It took me a couple of hours to do because I faffed about quite a lot. I think it should take about an hour.
Just take off the air filter housing by unscrewing the jubillee clip on the throttle body housing, remove the rubber band holding the housing in place and pull off the two air feeds. You might want to replace the air filter and I use an ITG filter.
Then remove the front part of the wheel arch liner on the passenger's side of the car. Do this by unscrewing three little screws (one on the wheel arch and two under the bumper) and pulling out two fir tree clips.
You can then see a 13 mm bolt holding the horn and air feeds on. Unscrew it and remove the two air feeds.
Finally just connect the new air feeds on the housing (I used 75 mm CAF) using jubilee clips, cut it to about 0.5 to 0.75 m and shove the ends of the CAF back down into the wheel arch. Basically that's it, job done.

Dead easy.

Cheers, Rob669

 

[BoomOne]

nice gonna give this a try. do the ends of the tubes fit into the orig mounts by the wheel arch?

 

[franx]

nice gonna give this a try. do the ends of the tubes fit into the orig mounts by the wheel arch?

i think they'll fit OVER them, and then using clip to tighten... (?)
(like on the filterhouse itself)

 

[ChrisR]

Might give that a go, already got an itg in the airbox.

 

[Bagus]

Did the same thing on my 182 and the car seems to be better...

The noise from the induction is more «angry» and I'm pretty sure that I've gained not much but at least I didn't loose

If I remember well I've used 70mm air feeds.

Here's a pic:

 

[RacerStu]

Glad your happy with it

 

[BoomOne]

k i am in the middle of doing this mod and have no idea how the hell you fit the new tubes to the mount by the wheel arch. those holes and the trumpets down there are just too small for the new tubes. anyone care to shed some light??

 

[BoomOne]

figured it out. pull some of the wire thru so yuo have a flappy bit at the end, pull the flappy bit thru the hole, stick the trumpet in and cable tie that biaach on

 

[ChrisR]

Would using the original end piece, and this keeping the same size intake holes, counter any benefit from changing the hoses in the frist place? Or does the size of the intake not make that much difference and the increased diameter of the full length of pipe will be good enough?

 

[Rob669]

I didn't bother fitting mine to the mount like that, the CAFs hang down behind the wheel arch on mine and seem to suck in all the air they need quite happily.

Rob669

 

[ChrisR]

Think that's what I'll try, I just think if you used the mount it kind of defeats the point of getting bigger hoses, although I haven't seen the originals to compare how much of a difference fitting them to the mount would make.

 

[BoomOne]

oh well, gonna take it for a spin now and see what its like. i also thought that having the same size intake holes would defeat the purpose of bigger caf's, but thought id try it out just to see. at least i can just take them off if they dont work

@ rob669: so you just let them hang down there. do they go all the way down to those plastic bits that fit to the base of the bumper?

 

[BoomOne]

well, went for a quick spin. Sounds nice, seems to have helped a bit for performance, and bumped into a 182 on the drive and had a little street race and wot not.

 

[ianeire]

Would using the original end piece, and this keeping the same size intake holes, counter any benefit from changing the hoses in the frist place? Or does the size of the intake not make that much difference and the increased diameter of the full length of pipe will be good enough?

Exactly my sentiments. The point of using the wider CAF is to get more air in. If your using the original mount then the diameter is still the same as previously you won't see a benefit and it's likely to be a placebo effect.

You need the whole CAF to be wide. What's behind the mount won't matter, only the same volume of air can get through the original hole...

 

[ChrisR]

Would using the original end piece, and this keeping the same size intake holes, counter any benefit from changing the hoses in the frist place? Or does the size of the intake not make that much difference and the increased diameter of the full length of pipe will be good enough?

Exactly my sentiments. The point of using the wider CAF is to get more air in. If your using the original mount then the diameter is still the same as previously you won't see a benefit and it's likely to be a placebo effect.

You need the whole CAF to be wide. What's behind the mount won't matter, only the same volume of air can get through the original hole...

lol that's exactly what I meant but failed to actually describe it properly

 

[AmDaMan]

So what do you suggest then to improve the ph2 airbox airflow? Or is it best to just get a ph1 box?

 

[Rob669]

oh well, gonna take it for a spin now and see what its like. i also thought that having the same size intake holes would defeat the purpose of bigger caf's, but thought id try it out just to see. at least i can just take them off if they dont work

@ rob669: so you just let them hang down there. do they go all the way down to those plastic bits that fit to the base of the bumper?

I don't want mine hanging that low because where I live we get occasional flooding. I've kept mine quite high and I think they're just below the headlight or thereabouts.

Rob669

 

[Paul J]

Would using the original end piece, and this keeping the same size intake holes, counter any benefit from changing the hoses in the frist place? Or does the size of the intake not make that much difference and the increased diameter of the full length of pipe will be good enough?

Exactly my sentiments. The point of using the wider CAF is to get more air in. If your using the original mount then the diameter is still the same as previously you won't see a benefit and it's likely to be a placebo effect.

You need the whole CAF to be wide. What's behind the mount won't matter, only the same volume of air can get through the original hole...

How big is the throttle body at its smallest point?

 

[ianeire]

I've no idea...

That's air going into the engine. This mod is trying to adjust the ratio of cold air to hot air being inducted...

 

[ChrisR]

I've no idea...

That's air going into the engine. This mod is trying to adjust the ratio of cold air to hot air being inducted...

It's not really though is it? It's replacing the standard air feeds for something bigger in the hope of getting more in. The positioning, and hence the intake temp of the air, is remaining the same.

 

[Ali]

I think it's in your head mate...We did a lot of testin with my old 172 with temp sensors, CAF and location or pipes...Did bugger all.

Car requires a constant supply not a forsed supply.

 

[BoomOne]

well they now be hanging in mine. took them off the mount earlier. cant really figure out if its any better tho. oh well, ill go give it another test in a few

 

[davebem]

I agree that the whole caf needs to be wide from end to end. Ive just upgraded mine, quite simply the most simple effective mod ive done, you can see in the pic below how restrictive the standard feeds are. On the left are the standard feeds and on the right the 70mm piping thats replaced it. The standard feeds get very narrow at one point. Wacking a ITG in helps aswell.

 

[Dan R]

please rob 669 u dont have to put your name after each post.

 

[ChrisR]

Well when I finally get the chance to go out with the laptop again I'll do a run with the standard feeds, then one without and check out the manifold pressures. I'm hoping that without I'll see the pressure not dipping as it is currently for me.

 

[Rob669]

please rob 669 u dont have to put your name after each post.

But I like to practice spelling my name. :rasp:

Cheers, Rob669

 

[Andyman]

For all the f4nnying about with these CAF's your time and money would be better spent ditching the OE intake pipe!

Your gains are only as good as the air that goes through your throttle body. IKs only stops the crap

 

[ianeire]

Ditching the OE pipes in favour of what exactly...? No pipes...?

Let the airbox suck air from the warmer engine bay...?

Cold air is less dense than warm air. The colder the air going through the TB the more of it will actually go through the TB and the more power you'll achieve.

Your gains are only as good as the air going through your TB

Whats the best air to have going through the TB, cold air.

 

[Graham Gooch]

Exactly my sentiments. The point of using the wider CAF is to get more air in. If your using the original mount then the diameter is still the same as previously you won't see a benefit and it's likely to be a placebo effect.

You need the whole CAF to be wide. What's behind the mount won't matter, only the same volume of air can get through the original hole...

How big is the throttle body at its smallest point?

The only person to make the correct assumption here.

You can have the biggest feed in the world, but once you get to the max ID size of the Throttle body its pretty pointless.

 

[Russ_16v]

Ditching the OE pipes in favour of what exactly...? No pipes...?

Let the airbox suck air from the warmer engine bay...?

Cold air is less dense than warm air. The colder the air going through the TB the more of it will actually go through the TB and the more power you'll achieve.

Your gains are only as good as the air going through your TB

Whats the best air to have going through the TB, cold air.

he means the intake pipe that fits from the airbox to the throtttle body mate,not the CAF pipes

 

[Andyman]

Ditching the OE pipes in favour of what exactly...? No pipes...?

Let the airbox suck air from the warmer engine bay...?

Cold air is less dense than warm air. The colder the air going through the TB the more of it will actually go through the TB and the more power you'll achieve.

Your gains are only as good as the air going through your TB

Whats the best air to have going through the TB, cold air.

Im on about the inlet pipe. Pretty obvious where the main restriction is just by looking at the photo's.
The straighter the smoother the pipe the better air flows. there's not much point sorting one area (the CAF) and neglecting the other (the inlet)

 

[Rob669]

All I really know is that changing the CAF pipes has made my car feel more responsive. It's now better to drive, but of course it hasn't turned my Clio into anything like a Ferrari.

How big is the throttle body at its smallest point?

The only person to make the correct assumption here.

You can have the biggest feed in the world, but once you get to the max ID size of the Throttle body its pretty pointless.

 

[ChrisR]

Yes the size of the inlet to the tb is a factor, but that's not what this mod is addressing, this is addressing the restriction in the feed. Once this is done you can work on the rest as you could also say ther's no point sorting out the inlet pipe without sorting the feed to the airbox.

I've just disconnected my standard feeds and will have a run out later with the RSTuner unit all plugged in. Will do a few runs up and down the DC, then will connect them up again and try again. I'm hoping to see that without the feeds the manifold pressure isn't dropping anymore. Not bothered about air temps for this test, I purely want to see if the standard feed is causing my pressure drop.