More info on charge temps please
 

Following on from my other thread, I will be ordering one of these very soon, and prob installing soon after Xmas.

Now what kind of charg temps should I be looking for?

What is good, what is bad etc.

Any info would be great

Cheers

Cookie :)

the info i have collected is.

no 2 days are the same

it all depends on outside temp etc.

but a long run on boost the highest i hit was 28 degress during the summer.

the highest heat soak i got was 62 in the summer

drivin hard doing 90ish should be no more than 35 really, i havent hit over that yet

Thanks, what kind of temps would be considered dangerous?

Sounds about right, mine was on a classic using an STI 8 intercooler

removing the trottle body coolant hoses helped especially with heat soak.

Damo

Keep it below 40 C for decent performance, the lower the better. If you can get your charge temp to less than 10 degrees above ambient then that's good. Once it gets over say 50C you're gonna start to run into problems, depending on how your car is mapped. That sort of charge temp is never going to be healthy.

No doubt someone will say I'm completely wrong and in fact the danger area is 44.65 degrees and above, but that's Scoobynet for you. I'm just telling you what I'd be looking for, personally. On track, temps in the 40's would have me slowing it down and taking it easier.

:thumb: Thanks thats the type of info im after

Generally it is best to judge charge temp as a difference from ambient but the cooler the better generally speaking. Hot air speeds up the flame front and causes the fuel mixture to burn quickly. This can cause det and should be avoided.

I have my charge temp warning set at 40C or above for track use.

In day to day use it never goes near that unless it is 38C outside :)

eg with mine:

cruise at 80 mph = exactly ambient or even less than ambient with the water spray.

WOT to redline in 3rd will go to ambient + 7 or 8
WOT to redline in 4th will go to ambient + 10 ish

At the ring in 27C outside temp on the long 2.4km flat out uphill climb up Kesselchen it reached 43C, but soon comes down when decelerating.

The coolant feed mod and cold air intakes help as it cools the air down.

There is a school of thought that says that each 1C of air cooler is worth about 2hp - worth paying attention to how cold the air going in is.

Superb, thanks :)

Not sure about these days but in the past i have been told the WRC guys came to the conclusion that 40degC was the 'ideal' charge temp. Fuel wouldn't mix as well with the air at lower charge temps.

I'm sure i had an article somewhere detailing all this, i'll have a dig about to find it.

Tony.

don't know where the above temps are measured, but I would guess just before the throttle?
I have my temp probe installed within the intake manifold.
I notice that temps are really high when the has been parked for half an hour with an hot engine.
I guess the intake has heated up and it takes a while for it to cool
also when flooring it the temp actually gets colder due to this effect.
Oh and i use an FMIC with heat isolated pipes together with cold air pick up, and the temp probe is insulated from the intake (only measures air not metal temp)
but i guess this would not be any problem on the track it would be fine.

For those that install the probe before the throttle body... i've just received the demon tweeks 2008 motorsport catalogue, on page 274 are some self sealing take offs for silicon pipework. Depending on the type of probe they could prove useful (£15 plus vat tho).

Tony.

Yes I think that in some cases, charge temp CAN be 'too cold' but I don't think it's an issue with standard road cars like our Scoobs that have 4 simple injectors spraying directly into the inlet ports rather than further up in the manifold. On a road car, just focus on getting your charge temps as close to ambient as you can.