Heat Shields

[ArthurS]

So, when I did the exhaust, I pulled off the turbo heat shield. I was planning on cutting it and just throwing it back on. There is noticable heat soak and am curious about different options.

I know you can use the stock cut one, or you can get a Cusco type hat shield, or you could use both the stock and a cusco on top of the stock.

What is everyone else doing? Is it really worth it to spend a additional 100$ to throw a cusco ontop of the stock heat shield?

[MikeK]

My car now has no heat shields on either the up or down pipes. I have chronic heatsoak. If I watch my boost guage, in the first few minutes after starting my car when the engine has warmed up I get around .095 Mpa boost. After 20 minutes of driving in slow traffic the best I can do is about .06 - .07 Mpa. My airconditioner only gets cold on the freeway. On the track day, I could hit about 110 mph at the end of the straight at the start of the session, by the end I couldn't reach 100.

I am ditching my car soon so mine will have the stock heatshields back on, but for a while I was researching what to do about the problem and I came up with the following:

- Get the header ceramic coated
- Get the uppipe and downpipe ceramic coated or wrapped
- Wrap the turbo with this stuff http://www.thermotec.com/products/full/15001/15001.html
- Add a heat shield over the turbo with a chimney that directs the heat away from the intercooler when the car is stationary. Here are two that I found:
Shield 1
Shield 2

From reading on nasioc, people who have taken some of these steps can drive their car hard, then get out and touch the intercooler and it is just warm. If I do that I get instant 3rd degree burns. It also seems that instead of feeling strong some days and weak others, the car will have a more consistant feel to it (and cold airconditioning).

[sperry]

Interesting info Mike!

I always figured my A/C warmed up at stoplights because of my underdrive pulley, but heat-soak is a very good explaination!

A heat shield might be a good idea!

IIRC, the normal reason for getting exhaust pipes coated/wrapped is because it make the exhaust expand more (i.e. retain heat in the pipe) for quicker spool. Not really for cooling the engine compartment, although that would be a side benefit.

[MattR]

Originally Posted by MikeK

I am ditching my car soon so...

What?? MR on the way?

[sti deede]

Originally Posted by MattR

What?? MR on the way?

Yeah do tell. What is the news? Your not leaving us are you?

[ArthurS]

Mike,

Thanks for that info. I only have one question really. Should I spend the 100+$ on a aftermarket shield, or should I just modify the stock heat shield and save the money. Do you think the aftermarket ones are that much better? Could I function well enough with a modified stock one?

Thanks!

[MikeK]

<thread hijack>

I have been looking seriously at the MR for a while now, but I not sure any more if it is worth the money (funny considering no one actually knows the MSRP yet).

The MR should be available in the next month or so in some parts of the country. The guys at reno mitsubishi said they aren't expecting them before next year though.

After owning a WRX for a year and having extreme STi transmission envy, I decided that it is worth paying extra for a better drivetrain ... but I think with the MR it is literally just an extra gear. The shifting mechanism has been changed for smoother shifts, but that is it. The rest of the drivetrain, including all 3 diffs, the active yaw control, axles, hubs etc etc are the same on the evo 8 and the evo mr. The engine changes in the MR for the extra power and torque are the same on the regular evo as well. The suspension changes aren't so important since any car I get will probably have new suspension put on it. And I have to buy a second set of rims anyway because I need dedicated snow tyres, so the new rims on the MR aren't really that special to me either.

So I am either going to wait until january for an '05 evo 8, or get an 05 STi in the next few weeks. The guys at cobb said their STi and WRX exhausts are identical, plus I hate waiting for things, so I am leaning towards an STi. The main thing holding me back right now is that there probably won't be engine management availabale until at least mid next year

On the other hand, if I wait for the evo, with all the new diffs and yaw control and whatnot, it should have amazing track manners, and 300 hp at the wheels is a very safe (and relatively cheap) target with all the mods that are already out there. I think I will go to the subaru guys this week and make them an offer they can refuse ... and if they refuse it just wait for the evo.

On a related note, I discovered that the person to talk to at the dealership is the internet sales manager. If anyone else is thinking of buying a new car soon, bypass all the normal sales guys and go straight to the internet guy's office

</thread hijack>

Back on topic: Scott, I am sure that heatsoak due to lack of shielding is what caused my air conditioning to stop getting cold at less than 65 mph because it was icy cold all the time before I swapped my exhaust, including some very hot days last september when I got the car.

[MikeK]

Originally Posted by ArthurS

Mike,

Thanks for that info. I only have one question really. Should I spend the 100+$ on a aftermarket shield, or should I just modify the stock heat shield and save the money. Do you think the aftermarket ones are that much better? Could I function well enough with a modified stock one?

Thanks!

Since I have no actual experience with heat shields, I am not sure.

I suppose anything in between the turbo/downpipe and the intercooler that will stop radiated heat has to be a good thing. From memory the cusco heatshield is just that, a flat piece of metal that blocks radiated heat, so I guess that if you can get the stock heatshield back into that location it would do the same job, right?

[MikeSTI]

Originally Posted by MikeK

On the other hand, if I wait for the evo, with all the new diffs and yaw control and whatnot, it should have amazing track manners, and 300 hp at the wheels is a very safe (and relatively cheap) target with all the mods that are already out there. I think I will go to the subaru guys this week and make them an offer they can refuse ... and if they refuse it just wait for the evo.

US spec MR's gets no yaw control

[MikeK]

Originally Posted by MikeSTI

US spec MR's gets no yaw control

Maybe active yaw control was the wrong phrase. The 05 models get a new front limited slip diff and STi style active centre diff. My point was that all evo models get these, not just the MR


Linky!!

[AtomicLabMonkey]

Originally Posted by sperry

IIRC, the normal reason for getting exhaust pipes coated/wrapped is because it make the exhaust expand more (i.e. retain heat in the pipe) for quicker spool. Not really for cooling the engine compartment, although that would be a side benefit.

When you start running a car on track for extended periods of time, the real reason for header wrap/shield(s) is to keep the radiant heat from hitting everything around the exhaust. Even on a N/A car (I'd imagine turbo exhaust would be even hotter) anything that's not metal starts melting, believe me.

The first time I rode along in our racecar, part of my shoe sole melted off where it was touching the bare transmission tunnel/firewall...

[sperry]

Originally Posted by AtomicLabMonkey

When you start running a car on track for extended periods of time, the real reason for header wrap/shield(s) is to keep the radiant heat from hitting everything around the exhaust. Even on a N/A car (I'd imagine turbo exhaust would be even hotter) anything that's not metal starts melting, believe me.

The first time I rode along in our racecar, part of my shoe sole melted off where it was touching the bare transmission tunnel/firewall...

Well, after a 30 minute session at Thunderhill the plastic bits (including the hose for my I/C waterspray that's bone dry just sitting there next to the exhaust) is still intact, so I'm not really getting things quite that hot. 'Course 30 minutes on track vs. a 45 min race in a prepped race car is a bit different...

I think a heat shield might be a pretty good idea on my car for Solo events... I spend an awful lot of time spraying water on my I/C after each run just trying to get it back down to ambient... and after my 3rd or 4rd run, I simply can't get it down under 100F before my next run!

[Evo Mike]

damn mike, so you're gettin an STi now?! which is it gonna be!? true, waiting for stuff sucks ass... and alot of what you've said about the MR is what i've heard as well. Hawaii should be getting an MR by the beginning of november.
Anyway, along with the extra goodies the 05' model evo's.. comes a higher MSRP (as if you didn't already know that)... i mean the 03-04 models MSRP went up $1K becuase they made the high wing standard on all EVO's in 2004. imagine how much all that other stuff is gonna make the price rise :shock: ..
After much thought and consideration, i've decided that Mitsu markets their cars terribly (not to mention the crap they produce other than the Evo)... Subaru has it right... a line of bad ass cars.. fit for nearly every age driver.
Let me know what you decide mike! Either way, STi, EVO... both awesome cars..

[BOO]

Originally Posted by MikeK

<thread hijack>

I have been looking seriously at the MR for a while now, but I not sure any more if it is worth the money (funny considering no one actually knows the MSRP yet).

The MR should be available in the next month or so in some parts of the country. The guys at reno mitsubishi said they aren't expecting them before next year though.

After owning a WRX for a year and having extreme STi transmission envy, I decided that it is worth paying extra for a better drivetrain ... but I think with the MR it is literally just an extra gear. The shifting mechanism has been changed for smoother shifts, but that is it. The rest of the drivetrain, including all 3 diffs, the active yaw control, axles, hubs etc etc are the same on the evo 8 and the evo mr. The engine changes in the MR for the extra power and torque are the same on the regular evo as well. The suspension changes aren't so important since any car I get will probably have new suspension put on it. And I have to buy a second set of rims anyway because I need dedicated snow tyres, so the new rims on the MR aren't really that special to me either.

So I am either going to wait until january for an '05 evo 8, or get an 05 STi in the next few weeks. The guys at cobb said their STi and WRX exhausts are identical, plus I hate waiting for things, so I am leaning towards an STi. The main thing holding me back right now is that there probably won't be engine management availabale until at least mid next year

On the other hand, if I wait for the evo, with all the new diffs and yaw control and whatnot, it should have amazing track manners, and 300 hp at the wheels is a very safe (and relatively cheap) target with all the mods that are already out there. I think I will go to the subaru guys this week and make them an offer they can refuse ... and if they refuse it just wait for the evo.

On a related note, I discovered that the person to talk to at the dealership is the internet sales manager. If anyone else is thinking of buying a new car soon, bypass all the normal sales guys and go straight to the internet guy's office

</thread hijack>

Back on topic: Scott, I am sure that heatsoak due to lack of shielding is what caused my air conditioning to stop getting cold at less than 65 mph because it was icy cold all the time before I swapped my exhaust, including some very hot days last september when I got the car.

Again.. Apologizing for the Thread HiJacking but here is the INFO. (Including Pricing)on the MR if anyone wants to read it ..
http://forums.evolutionm.net/showthr...ghlight=evo+MR

[AtomicLabMonkey]

Exhaust heat also might not noticeably melt, but definitely shortens the life of items that are near the headers like the clutch cable, spark plug wires, starter motor, etc. etc...

[sperry]

Originally Posted by AtomicLabMonkey

Exhaust heat also might not noticeably melt, but definitely shortens the life of items that are near the headers like the clutch cable, spark plug wires, starter motor, etc. etc...

None of those things are close to the headers, what are you talking about?

[Theo]

I cut and replaced my heat shield after the turbo back install. It was easy and made the change less obvious when opening the hood. Easy and cheap.

Theo

Originally Posted by ArthurS

Mike,

Thanks for that info. I only have one question really. Should I spend the 100+$ on a aftermarket shield, or should I just modify the stock heat shield and save the money. Do you think the aftermarket ones are that much better? Could I function well enough with a modified stock one?

Thanks!

[ArthurS]

I think thats what I am going to do. Thanks all.

[AtomicLabMonkey]

Originally Posted by sperry

None of those things are close to the headers, what are you talking about?

It depends on the car, on ours they are.

[sperry]

Originally Posted by AtomicLabMonkey

It depends on the car, on ours they are.

Turbo Subaru headers wrap around the oil pan... how's that for engineering?

[AtomicLabMonkey]

Originally Posted by sperry

Turbo Subaru headers wrap around the oil pan... how's that for engineering?

Wow, that was good thinking... cause you know, the hotter the oil gets, the better it works.

[MattR]

Originally Posted by AtomicLabMonkey

Wow, that was good thinking... cause you know, the hotter the oil gets, the better it works.

Hot oil only works good if you have special deposits and speed chunks in your fuel!

[MikeK]

Pep boys wanted to charge me $40 for a 1 pound box of speed chunks. What a ripoff! Does anyone know where to get them online?

[MattR]

Originally Posted by MikeK

Pep boys wanted to charge me $40 for a 1 pound box of speed chunks. What a ripoff! Does anyone know where to get them online?

The best ones come from Pre-Vietnam war era Mig fuel tanks...You have to suck them out.

[MattR]

Sperry knows where to get speed chunks..