Heat Soak - Cods Wallop

[senna_T]

I think you have to stop the problem before it starts. If the intake air is hot (from a hot airbox) then you will have issues before the intercooler or piping can have any effect - positive or negative.

[turbotrana]

you are trying to keep the heat on the exhaust valve to turbine side and the heat out of the compressor,intake pipe,intercooler pipe, intercooler side.

I disagree. Whilst air is travelling very quickly thru the intercooler pipes, there still is heating of the air which you dont want for power. How much it heats up I cant tell you, but those pipes get extremely hot depending on where they are located.

When I made my tubular turbo exhaust manifold my aim was to keep the pipes away from the compressor as much as possible. I read in a tech journal that that's what they were trying to do with one paticular turbo category.

In the turbine side the manifold is made out of stainless steel purely as it retains heat very well.

[F6 UTE]

How many back to back runs could I complete? How long is a piece of string - and within tenths.. 42 degree track temps - and got quicker every run.. You notice it more on a track, as mentioned the exhaust manifold glows red/white hot. Boost response is instant, the turbo screams it's head off and feels REALLY good..

Goes bang? Well, there's smart and there's stupid in regard the levels of risk you wish to take. All I'm saying is, out of the factory the PCM pulls way too much out, way too early. Log it, track it, test it then adjust it.. Doing it smart!!! IMO a lean tune and changing the knock limits will do more harm..

Majority of tuners these days wouldn't have a clue as to anything other than boost and fuel tables, maybe dabble the shift firmness on the 4spd... That doesn't make them good at what they do, it makes them overly priced tinkerers who want to dabble in the market share (good on em if they get your $$)..

XR6T 747 - your confusing intake temps with heak soak, they are very different. Cold air attracts another variable - density altitude.. That has even more effect to a hot day run..

I'm talking on any given day, back to back runs - heat soak is not the issue (to the degree) you thought it was, it can easily be outweighed by keeping the heat IN that exhaust....

[Process West]

  F6_Tornado said:

Once it leaves the Intercooler the piping does very little by way of heat absorbing due to the velocity of the Air within it.. What little effect it did would have minimal effect hence what he is saying above.

Exactly....even though an intercooler pipe may be very hot to touch the compressed gas going through it is traveling at Mach 50 and a piece of tube is a very bad heat exchanger...you can run an intercooler pipe right past a red hot exhaust manifold and it will make no difference to the temp of the air inside.

Kev

[Under-Pants]

^^Kev, just wondering why the stock BA/F boost piping & crossover is always said to be inefficient because it wraps around/over the engine? Does its proximity to that hot metal mass do this, or is it based around other things like length, diameter etc etc?

I have heard people occasionally say that ^^ the heat on the pipes from the engine = :( ... that’s all. Are they douchebags?

Cheers Kael

[Benny]

Interesting thread this one. Heat Soak sounded plauseable to me but now I'm undecided. I definately know heat kills things and shortens equipment reliability. That would be why I'd open my bonnet.

Edited 29/10/08 09:47 AM by Benny

[RAP1D]

When your motor is at idle, with the turbo just lightly spinning, only vacume is drwing the air through the IC piping, this is where heatsoak is at its greatest.

Obviously, on high boost the air wont be in the pipes long enough to be effected by the accualy pipe temperature, but at idle, its a totally different situation.

Cooler pipes are generally not run over hot exhaust manifolding for a reason... even those that have designed IC systems that run over the turbo have sinse realized this and have changed their designs.

The factory pcm does pull timing very early, so the better, more efficient a system is the better.

[Trough Lolly]

sh*t I can hear Lawsy making a come-back.......