Why upgrade to RS2 airbox and IC?

[Rusty]

My airbox is bodged within an inch of it's life Paul, sorry to let you down (linky) No experience of the RS2 airbox but it's a fair amount of wedge that could be put towards a more fundamental upgrade like remap, exhaust or turbo.

Matt, thanks for the reminder about torque. IMO the k24 is a bit small for the I5 so a turbo capable of slightly higher flow is a good idea. The increase in lag would be minimal and you're still going to have plenty of torque and more of it up top, hence more power.

There really weren't any noticable benefits to fitting the RS2 IC on my setup, a custom remap would undoubtedly have given useful gains but there was no noticable change to drive and the rollers just confired this. £300 is a long way towards a decent exhaust and I'd spend my money there on a standard car.

Paul, the number indcates that there was a 20ftlbs increase with the RS2 IC before & after

[newsh]

What you see with the RS2 airbox is that the filter is repositioned for better flow, in the ABY box the plastic top is quite close to the filter panel and obscures about a 1/2 of the area, there's some comparo pics in my project thread (click the link in my sig below, page 5). Cooler air = more oxygen = greater volumetric efficiency. I noticed the RS2 IC big time, but I was coming from a 3B unit so quite a jump, I was on a homefry at the time. I'm now on a monster IC (and RS2 spec remap) and noticed that increase too. And yeah, its all about torque and midrange for me.

[tobodestroyer]

Paul,

How much is an RS2 airbox and where do I get one? If I do, is it literally a straight swap? Likewise, how much and how easy to change the IC?

Tobo

p.s. I'm still loving your Homefry

[newsh]

Tobo, I got my RS2 box second hand, if you put some feelers out and stay patient.. IC the same, I just sold mine but they come up from time to time.

[Rusty]

RS2 IC requires a modified cross member or RS2 cross member. Airbox requires a new plastic bit behind the headlight.

[TEKNOPUG]

Is the overboost on the ABY ECU dynamic in anyway? By that I mean, will it boost up to a certain level and only back off once variables such as fuel, inlet temps etc meet a predetermined level? In other words, if you improved the IC (reduce inlet temps) and fueling, would it overboost for longer/harder? Or is the ECU set to overboost to a certain level and time regardless of additional mods (all things being equal such as the lamda/knock giving safe readings)? Just trying to understand a little more of how the engine is set up and where there are opportunities for exploiting improvements.

Also, by small hybrid turbo, what sort of size are we talking - T28 for example or T3+

[Rusty]

Small hybrid is a less aggressive version of a K24/26 hybrid than the RS2 unit as per Nothelle or MTM.

Overboost seems to be load and engine speed related as well as being linked to how fast you press the throttle. Personally I'd prefer to get rid of it altogether and run overboost boost levels all the time (IME this is waht MRC do with their chips).

[Matt_D]

Do us a favour - get some VAGCOM acceleration runs before and after if you can - say from 30-70 (ish), WOT in 6th...

And do the RS2 IC last - I'd like to see three sets of results...

1 - Stock engine with homefries
2 - RS2 airbox (doesn't matter so much about MAF but hey)
3 - RS2 IC

try to do it on same stretch of road, a few times to average out and make sure the car is properly warmed up but isn't heat-soaked on any run.

Logging IAT is crucial here - I should have old logs myself - aint done it in ages but happy to do so for comparative purps....

I don't have VAGCOM unfortunetly, i can try and time it with a stopwatch not brilliant i know but it should give us a rough idea

[Flat on my back]

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That'll be past Parklands on the Northern bypass then?

Dont use the Golden Valley (errrr...sounds rude )the cops have their base just off the motorway roundabout.