Induction Temperaure - Bad

[cuspub]

From what I have been able to decipher, there has been some suggestion that raising the boost with the stock intercooler isn't a problem and doesn't affect intake temperatures.

As seems common, when the standard exhaust (or at the least the centre muffler and cat) are changed for freer flowing items, it tends to increase the factory boost by a small margin, hence also raising the power slightly (the boost raises the power, not the exhaust, it is merely a facilitator).

Thing is, this minor mod alone (marginally increased boost) can have a devastating affect on intake temperatures.

If you don't believe me, check out the attached pic of an intake intercooler crossover assembly whereby the owner had changed the exhaust (completely), and although driving the car like it should be (relatively hard), it had not been on a racetrack. Irrespective, the scars are there. Heat is a genuine problem and increasing boost while retaining the stock intercooler is fraught with problems from a long-term reliability perspective.

Sure, you will get away with it for a while (just like people who only change the oil in their engine every 15,000k), but given time it will turn around and bite you.

Agree? I would like to hear if others are having the same problem.

[Macktheknife]

Interesting

Need to know more detail if possible. Certainly been a good deal of heat there.

[OwnaXR6T]

I agree the stock intercooler isnt sufficient for my car anymore, I notice around 20% power gain in the morinig and late at night. im running 9 pounds. How many kms has this car done since the boost has risen?

[bcl]

I had heat blistering in this crossover area BEFORE I made any changes, so don't assume it's related to mods.

Brian

[ktford]

I'd suggest it's the casting of the product & the inconsistencies/tolerances that lie with in that'll be the cause of this.

Scotty

[ktford]

Owna,

you'll find that that's a characteristic of the turbo car, ecpecially one fitted with AC/Auto trans, its cooler & all the other heat creating devices. I believe that you like me will not escape this problem with a mere intercooler.

Scotty

[Cypher]

I wouldn't think that the induction temp alone would cause this.

Has anyone considered bonnet venting??

Simple cure for heat. May be a little bit expensive but would help is disapating engine bay heat and lowering induction temps.

[ms700]

  ktford said:

I'd suggest it's the casting of the product & the inconsistencies/tolerances that lie with in that'll be the cause of this.

Scotty

I totally agree with Scotty here. I am currently polishing one of these crossover pipes up, and I can tell you, that black crinkle paint stuff is a utter *beep* to remove!

[mickq]

Whats seen in the photo has nothing whatsoever to do with the intercooler or any exhaust mods.

And changing the exhaust from the turbo back wont effect boost.

On the exhuast side, the freer flowing exhaust may seem to be adding benefit to the turbo, but the turbo has an electronically controlled waste gate. It was still kick in and relieve excess boost at the exact same point it did before. ie peak turbo output wont change one little bit.

Its theoretically possible that the turbo may spool up a little faster due to the freer flowing exhuast gases, but this is not the same as increasing boost. It wont increase peak horsepower or torque either, although it may drop them down just a few RPM.

On the intake side, the exhaust ports are closed when the turbo is shoving air into any given cylinder, so the exhuaust mods are having no effect at all on that side either.

This supposed "devastating" increase in intake temp as you state it simply doesnt exist.

Im not sure if this is your logic, or perhaps some dealer is trying to convince you that your mods caused the problem you see, or you work for a dealer that claimed that rubbish so as to deny a warrantee claim for someone who changed their exhaust. Either way you are wrong. And that "damage" is only cosmetic.

I have much worse paint bubbling and peeling on my dead stock standard XR6T than is in your photo. Im waiting on a replacement to arrive under warrantee. Its caused by nothing other than my driving hard which results in high under-bonnet temperatures on top of the engine, which leads to the paint bubbling. If you pick at the paint, it comes off, and you get what you see in the photo you attached. That piece of hardware is just a cm above the heads and smack bang over the top of the cylinders and also not far from the turbo, and also the highest point of the bonnet where all that heat gathers....its VERY close to a lot of constant heat.

If the air intake temp was, as you state, to blame for this, there is not a chance in hell the car would even run as the air intake temperature would be more than hot enough to boil water.

[Cypher]

Well said.