So, I have noticed recently (in particular today on way home from work) that when the car is very hot after say an extremly spirited drive for a good period of time that I am getting a reduced boost. Normally I hit around 17-18psi which tails off slowly as I peak at high rpm. After a real good long thrash, like say track day kinda treatment and things get real hot it peaks at around 12psi and it looses some of its urgency.

 

Now its running a stage 1 with a few other mods however it is still running on the standard SMIC. My question is that is it normal to loose the best part of 5psi through heat on these cars? And that fitting a FMIC will fix the issue, or could it be that there is a boost leak of some description that only manifests itself when things get real hot?

 

If it is likely to just be heat related then I guess I had best pull my finger out and fit the FMIC I currently have sat on the floor in the corner of my lounge and be done with it

 

As always guys your help and experience would be appreciated.

 

Cheers

 

Dazz

 

 

Yep the 1.8 t engine suffers massively from heat soak. The ECU will then back off boost and alter other fueling parameters for protection. Get that FMIC fitted.

I suffer this too and it always seems to happen when i really want all my boost you know when youve a scooby trying to bait you..

Given that there is nowhere for the air to go once it goes over the intercooler this isn't too surprising.

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Seems to be a known issue on these - with the ultimate fix being the FMIC as you know.

 

Mine's the same - great on cold nights, but on some hot days - a slug.

 

As an interim measure, you can do the wheel arch liner mod?

I agree with trundlenut, it's not necessarily about the size or position of the intercooler core, it's more a case of exhausting the warm air effectively from that area. When it comes to intercoolers bigger is not always better, you will loose about 2-3% of the pressure for ever 90 degree bend in the ductwork too or In layman terms the turbo works harder to produce the same boost level.

I must admit I do have a front mounted intercooler on my felicia, with non ideal ducting routing, but I don't get any heat soak at all with that setup.

Even with my jabba induction kit, last years hot days made it poo ( hot days like 27-30'c )

The kona is much better it seems but im yet to use it on a hot hot day

The poor b******'s mod.

 

 

 

 

Isn't perfect, but does allow for warm air to escape and keep the SMIC a *little* cooler.

 

Other members have the proper one from Super Skoda.

Hehe whats did u use to paint that tyre bit

For the size of the vent that must be pretty useless.  Get the arch liner off and drill a good few half inch holes directly behind the intercooler

Hehe whats did u use to paint that tyre bit

 

I've tried loads of different markers, but this one is the only one that works well:

 

http://www.ebay.co.uk/itm/TYRE-PAINT-TYRE-MARKER-PEN-MOTORCYCLE-WHITE-PERMANENT-/130637308021?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item1e6a972075

 

Be warned of others that are watery and have barely anything in them!

 

 

For the size of the vent that must be pretty useless.  Get the arch liner off and drill a good few half inch holes directly behind the intercooler

 

Big holes in the side FTW - the louvre is simply a cover to protect SMIC from crap.

 

 

 

It's definitely no where near as good as a FMIC, but I've certainly noticed the boost hanging around a bit more on warmer days. I'm not putting any holes in the arch because it'll just get clogged up. The wheel will ping crap at it and if you blast the hose at it to clean the holes, all it will do is push the mud and crap through the holes, covering the SMIC.

I've got a wheel arch vent off a fiat brava knocking around somewhere that I never got around to fitting to my old car.

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Anyone ever considered their a.I.t (air intake temp sensor)...

 

If this is kaput, the ecu could be fooled into thinking ambient temp outside is warmer than actually is...?.... 

^devils advocate but worth considering 

I did mine years back, actually I think with probably 3/4 holes, quite a few too, noticed no ill effects.