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Old 01-21-2012, 10:41 AM   #151
bschweig
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In the original post in this thread you noted you would:

"We will also be looking into some vents for our stock hood."

Im interested in this for my 08 STi. Can you (or anyone) update us on this subject?

Thanks for the useful thread!
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Old 01-21-2012, 12:27 PM   #152
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Vents are very useful, next to insulation getting rid of under hood heat can help just as much... They can even help with airflow though the TMIC speeding up cool-down of a heat-soaked IC and also get/keep the IC a bit cooler if placed in the right place on the hood by lowering under hood air pressures thus allowing for more airflow into the engine compartment through the rad and hood scoop... Well worth the effort in my book...
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Old 01-21-2012, 09:22 PM   #153
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We got a Vis hood for the car, we liked the huge vents as they sit right over the sides of the motor. So heat coming up from the headers and turbo can escape easily.

We haven;t done any scientific tests with temp differences, but When sitting still at a light or stop sign you can see the heat billowing out. So we're pretty sure it's doing it's intended job


We also added a Grimmspeed heatshield. It fits right over the DEI turbo blanket and adds another layer of protecttion for our TMIC.
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Old 01-28-2012, 11:01 PM   #154
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Any thoughts on how a vented hood impacts pressure gradients in the engine? I have a FMIC and a hood scoop block off plate to help flow through the radiator. Ive heard (Crawford is big on this) that vents can actually reduce flow through the radiator. I wonder if they are located in the 'right' spot if they might still help with cooling though?
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Old 01-29-2012, 11:24 AM   #155
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Quote:
Originally Posted by bschweig View Post
Any thoughts on how a vented hood impacts pressure gradients in the engine? I have a FMIC and a hood scoop block off plate to help flow through the radiator. Ive heard (Crawford is big on this) that vents can actually reduce flow through the radiator. I wonder if they are located in the 'right' spot if they might still help with cooling though?
As you can see here there's only one low pressure area where the engine air comes out, while driving down the road, and that is just past the first 6" of the top of the hood... Thus lowering under hood air pressure allowing more air into the engine compartment both from the front and the hood scoop, thus helping in cooling both the rad/front mount and the TMIC. I have done tests on my TMIC and have seen lower IAT with my vents as compared to without vents... http://s18.photobucket.com/albums/b1...essure_Map.gif
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Old 01-29-2012, 01:35 PM   #156
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Quote:
Originally Posted by wrxdrvr View Post
As you can see here there's only one low pressure area where the engine air comes out, while driving down the road, and that is just past the first 6" of the top of the hood... Thus lowering under hood air pressure allowing more air into the engine compartment both from the front and the hood scoop, thus helping in cooling both the rad/front mount and the TMIC. I have done tests on my TMIC and have seen lower IAT with my vents as compared to without vents... http://s18.photobucket.com/albums/b1...essure_Map.gif

This is very useful. Lots if interesting stuff in your photobucket site...!

Do you know or think if the pressure dynamics over and under a GR hatch are similar?

I have had a long running battle with track day temperatures in my car (which I have lost twice... on my second rebuild). I have done many many things to try and mitigate the problem. If I go for hood vents, I can either cut them into my stock hood (I think... seems like someone would make vents that could be fit into a hood, but I cant find such a thing?) or purchase a Seibon CF hood. If the latter, there are models with vents close to the front of the hood or models with vents near the windshield. If flow over the GR body is the same as in your diagram, I would want the vents nearer the rear (or windshield side) of the hood, right?

Thanks for any comments you might have...
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Old 01-29-2012, 02:11 PM   #157
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The vents like Circuit Motorsports vents are great for when stopped and going slow, but when moving fast, would probably raise under hood air pressures making it harder for air to go through the TMIC and even a FMIC... The best place for vents is right at the front part of the hood about 6" back, There the air would actually get "sucked" out never in when moving and would also allow hot air out from the rad when stopped... As for vents near the windshield the air-pressure rises the closer you get to the windshield and the air would go into the engine compartment most of the time wile moving...
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Old 02-21-2012, 12:47 PM   #158
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I'm not sure how they do at speed, I'd like to add a lip at the front edge of the vents to try and create a bit or low pressure behind the lip to pull some air out. Haven't gotten around to that yet, need to find a good material for it.
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Old 02-21-2012, 03:05 PM   #159
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Just placed my order on your site for the gold tape for the underside of the heat shield and the silver tape to wrap the intercooler. When it comes time for emissions and I have to swap my stock DP back on I will use that time to wrap my COBB DP with the DEI exhaust heat wrap.

Thanks!!
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Old 02-22-2012, 12:29 PM   #160
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No prob Sc00ter, thanks for the business
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Old 02-22-2012, 12:29 PM   #161
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No prob Sc00ter, thanks for the business
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Old 03-30-2012, 03:59 AM   #162
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so im actually planning to go nuts with this heat suppression.

turbo blanket
heat wrapped DP (not covering flanges just so its easier to access bolts)
turbo heat sheild with reflective tape underneath
Spearco TMIC (which actually sits directly over the turbo) covered in reflective tape

1) is the gold tape a better performing product than the silver tape shown in post #1?
2) would a 2"x15' roll be enough? or would it be safer to go with a 2"x30'?
3) what size-length DP wrap would be be good? no need to wrap the cat in a catted DP?
4) blanket - PTP vs DEI Ti? perform about the same?
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Old 03-30-2012, 09:25 AM   #163
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I went with the DEI Ti, and love it. The only issue I have with it on my 16G is that it looks like it rubs the waste gate actuator but I frequently look in there to make sure it hasn't moved to where it would hinder movement or get caught on anything. I've worked with things similar to the PTP in the military and would see them degrade over time. I don't know anything about their product but that made me weary of that style.


So I'm still unsatisfied with the water temps I'm seeing. I had problems last summer heat and have been prepping all winter for this summer. Well its warming up and I'm already seeing water temps spike to 208* or so. I've wrapped my DP, and my PnP GS Exhaust Mani, Put the DEI Ti blanket on the turbo and a heat shield. No reflective tape at this time and still haven't wrapped the Up Pipe but it is heat coated. I'm running my stock underbody shield and have seen better temps with that and don't really want to cut vents in my stock hood, although I have thought about looking into one of the carbon hoods with vents. just more $$$ then I have to spend.

Any other suggestions on what I can do. I'm running a Mishimoto Radiator, Wetter Water, Stock T-stat, (have a 160* that I may try again) and Mishimoto Fans.
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Old 04-02-2012, 02:40 PM   #164
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Quote:
Originally Posted by gsrcrxsi View Post
so im actually planning to go nuts with this heat suppression.

turbo blanket
heat wrapped DP (not covering flanges just so its easier to access bolts)
turbo heat sheild with reflective tape underneath
Spearco TMIC (which actually sits directly over the turbo) covered in reflective tape

1) is the gold tape a better performing product than the silver tape shown in post #1?
2) would a 2"x15' roll be enough? or would it be safer to go with a 2"x30'?
3) what size-length DP wrap would be be good? no need to wrap the cat in a catted DP?
4) blanket - PTP vs DEI Ti? perform about the same?

the 2x15 may be enough, depends on how much you cover, I'd go with the 2x30 just to be sure. The Gold Tape is the better reflecting material.

2x50 ft. for the DP for a nice tight wrap all the way back.

DEi Turbo blanket is what I use and recommend, nice thick blanket and the material is great at insulating.

PM us if you want some help with this stuff
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Old 04-02-2012, 02:42 PM   #165
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Quote:
Originally Posted by bdj238 View Post
I went with the DEI Ti, and love it. The only issue I have with it on my 16G is that it looks like it rubs the waste gate actuator but I frequently look in there to make sure it hasn't moved to where it would hinder movement or get caught on anything. I've worked with things similar to the PTP in the military and would see them degrade over time. I don't know anything about their product but that made me weary of that style.


So I'm still unsatisfied with the water temps I'm seeing. I had problems last summer heat and have been prepping all winter for this summer. Well its warming up and I'm already seeing water temps spike to 208* or so. I've wrapped my DP, and my PnP GS Exhaust Mani, Put the DEI Ti blanket on the turbo and a heat shield. No reflective tape at this time and still haven't wrapped the Up Pipe but it is heat coated. I'm running my stock underbody shield and have seen better temps with that and don't really want to cut vents in my stock hood, although I have thought about looking into one of the carbon hoods with vents. just more $$$ then I have to spend.

Any other suggestions on what I can do. I'm running a Mishimoto Radiator, Wetter Water, Stock T-stat, (have a 160* that I may try again) and Mishimoto Fans.

I had my up-pipe coated and I still wrapped it, it puts off a lot of heat.
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Old 04-02-2012, 03:28 PM   #166
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Quote:
Originally Posted by bdj238 View Post
I went with the DEI Ti, and love it. The only issue I have with it on my 16G is that it looks like it rubs the waste gate actuator but I frequently look in there to make sure it hasn't moved to where it would hinder movement or get caught on anything. I've worked with things similar to the PTP in the military and would see them degrade over time. I don't know anything about their product but that made me weary of that style.


So I'm still unsatisfied with the water temps I'm seeing. I had problems last summer heat and have been prepping all winter for this summer. Well its warming up and I'm already seeing water temps spike to 208* or so. I've wrapped my DP, and my PnP GS Exhaust Mani, Put the DEI Ti blanket on the turbo and a heat shield. No reflective tape at this time and still haven't wrapped the Up Pipe but it is heat coated. I'm running my stock underbody shield and have seen better temps with that and don't really want to cut vents in my stock hood, although I have thought about looking into one of the carbon hoods with vents. just more $$$ then I have to spend.

Any other suggestions on what I can do. I'm running a Mishimoto Radiator, Wetter Water, Stock T-stat, (have a 160* that I may try again) and Mishimoto Fans.
Coolant temps don't/aren't really effected by under hood heat, JMO, airflow through rad is what counts the most... I usually spend a few hrs every 6 months or so straightening the fins of the radiator and AC condenser to allow as much air through as possible. I also noticed a bit of a drop in coolant temps after I did my hood vents just above/past the radiator... Those vents also make a huge difference in TMIC heat-soak that's usually an ever present problem on these cars but is no longer a problem on my car...
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Old 04-03-2012, 09:04 AM   #167
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Yea, I haven't done the up just cause its a PITA to get to or off. I tried straightening the fund once. Probably could stand to just get a new condenser.

Yesterday running up a heavily traffic are of narrow switch backs at 15% grade I had a VERY hard time keeping temps down. Going to my tuner next week to see if he has any other ideas or can help me find the heat gremlins.
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Old 04-04-2012, 02:39 PM   #168
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circuit, thanks for the info.

do you know what size blanket will fit the VF52 turbo? (stock on 09+WRX) T3?T4?
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Old 04-04-2012, 02:54 PM   #169
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http://forums.nasioc.com/forums/show....php?t=2298336 is what you want to read.
http://forums.nasioc.com/forums/show....php?t=2303664 shows what to buy for your downpipe, the amount.....buy more than you need and return as the amount that Timmy uses means zero as your wrapping skills are different.
Skip the gold tape....that ****'s expensive and when the turbo is wrapped like link #1, you will see that there is NO NEED for additional protection unless you are a "it puts the lotion on it's skin" kinda guy.
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Old 04-04-2012, 03:12 PM   #170
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im a "it puts the lotion on the skin" kind of guy.

i appreciate the effort you put into the writeup, and for sharing, but i would prefer to have a premade blanket solution. IMO it will provide a more polished product and provide better results. hence why i asked which size blanket will fit the vf52 turbo.

also the top mount i plan to use will be DIRECTLY over the turbo so i personally feel additional protection WILL be necessary.

see this pic:
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Old 04-04-2012, 03:17 PM   #171
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It won't, but call (512) 490-6494 and they can help you out as to a premade solution. Kudos for admitting your quirks though...nothing wrong with that and I wish more people did that here.
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Old 04-04-2012, 03:23 PM   #172
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Hell yea gold bling under the hood
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Old 05-01-2012, 08:24 AM   #173
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You might want to consider getting the gold film if you're covering large areas.
https://www.pegasusautoracing.com/gr...ID=HEATBARRIER

If you want to see if the hood is working, you'll need some bits of string
http://autospeed.com/cms/A_108674/article.html
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Old 05-02-2012, 12:42 PM   #174
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Quote:
Originally Posted by Unabomber View Post
http://forums.nasioc.com/forums/show....php?t=2298336 is what you want to read.
http://forums.nasioc.com/forums/show....php?t=2303664 shows what to buy for your downpipe, the amount.....buy more than you need and return as the amount that Timmy uses means zero as your wrapping skills are different.
Skip the gold tape....that ****'s expensive and when the turbo is wrapped like link #1, you will see that there is NO NEED for additional protection unless you are a "it puts the lotion on it's skin" kinda guy.

I completely disagree.

The turbo puts off A LOT of heat. I have my turbo wrapped in a blanket, I have a Heatshield and I have my intercooler wrapped. The intercooler will still get hot under extreme use, so I'll spray it down with my IC sprayer when needed as well.

I don't see your homemade blanket having enough coverage honestly. You really want to have the whole hot-side covered, and then wrap the flanges as well with wrap.
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Old 05-17-2012, 04:22 AM   #175
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Bump!
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