hmm interesting... you just saved me some money lol! +1 for you

 

:think:

 

updated info!

 

alright, now we need more people to confirm this by reproducing the results

 

i agree...also maybe someone running a turbo at different boost levels would be nice to see i know on my old 97 prelude i was boosted on that and i put a carbon fiber hood with a big vent on the front of it (invader i think it was called) ended up right over the turbo and i noticed a 25deg drop in engine temps. just a thought though on the boosted aspect compared to all motor.

 

lol, thanks for the info earlier cambodian ricer. i went out and did the mod and these were my results. if any of it was inconsistent I'd begin to second guess more, but so far, no benefits at all. I was disappointed. I lost hours, tons of gas, 5 bucks on the parts, and worst of all, broke one of my threads on my hood and now only have 3 bolts in it.

 

its alright!, you did it for 8th!

 

Good maybe the dumbasses who swear by these things will finally shut up about them. But hey, people do stupid mods that aren't functional and make their car uglier at the same time all the time (*cough*Konig wheels*cough*) so this probably won't have any effect whatsoever.

Good test though! Thanks!

 

this is very very interesting.....
now i am considering removing my hood spacers today who knows..

anyone else ever done anything similar to measure temp/airflow?

 

Good job & way to contribute to the community

 

:cheerleader:

After my review (which was noting stellar and upset some people) I always second guessed my decision to disliking the spacers.

I am glad to see there is validity and more information surrounding my dislike for this mod.

Thank you for taking the time to do this.

If you are like me you are going to be sick to your stomach for a while now (about your hood). Now you can justify getting yourself a carbon fiber hood (gotta have all 4 bolts holding onto it right? )

 

hahaha, I said that exact thing to the gf! I've always wanted CF but I can't justify the price nor painting a target on my back for the cops. if I could get a nice vented one (functional) and paint it back to OEM TW, then I'd consider it, but the cost to do it, I'd rather buy cams or something lol

ImTheVoiceOfGod also tested these in the other Hood Spacers thread and found that they reduced his IAT's at the MAF by 20 degrees.It's entirely possible that the spacers allow for more airflow(and thus turbulence) to mix the warmer and cooler air thus bringing the temperature of the air in the area of the SRI up a few degrees.God job on the info though,but I say it's still inconclusive for everyone because the main benifit is'nt decreased IAT's but lower underhood temps overall.

yeah, like I said, I don't think my data necessarily makes sense since at idle, I'm basically making the car more like an open hood which I definitely know dropped temps.

However, how much does underhood temps help your performance? I'm curious because isn't it, for the most part, your car's performance is about the intake temp since that's the only place the car's really using oxygen? I mean, I guess aside from the radiator or something. I know engines are supposed to be more efficient at 212 or something right? I just figure that it's best to have a warm engine but cool air (hence CAI).

but seriously, I don't know. like I said, I really wanted to believe I broke a thread for a reason and wasted hours for a payoff. I actually didn't even think it was that ugly at all. I was ready to just leave it as is if I noticed ANY benefit.

what about removing the weather stripping on the cowl???

it vents some heat but it doesnt interfere with the aerodynamics because the hood is still in stock position

i really dont know if it helps or not

I really wanted to know about this myself, but honestly it was late and that'd require another whole test and drive. I could theoretically go out and test stock (since I'm back to it) and then remove the cowl I suppose, but I'm wondering how bad it really is to remove that cowl.

maybe the key is finding the optimum angle of the hood. maybe the lift/angle the hood spacers provided was excessive causing turbulence, hence hindering the hot air to exit efficiently.

yes.

Can somebody with real physics knowledge correct me if it's wrong, but I heard this somewhere and I don't know how much of it is BS and how much of it is true:

Basically, by keeping the hood sealed (stock) you create a high pressure area in there and then when the car moves the low pressure area over the hood forces the low pressure air in the engine bay out, thus making stock formation efficient. Therefore, without the stock placement of the hood, you lose some of that high pressure in the engine bay and more hot air is trapped under the hood.

The argument for hood spacers then is that you would hopefully sacrifice some of that ability to move hot air out at speed with the ability to vent it out at idle/stopped.

 

ImTheVoiceOfGod also tested these in the other Hood Spacers thread and found that they reduced his IAT's at the MAF by 20 degrees.It's entirely possible that the spacers allow for more airflow(and thus turbulence) to mix the warmer and cooler air thus bringing the temperature of the air in the area of the SRI up a few degrees.God job on the info though,but I say it's still inconclusive for everyone because the main benifit is'nt decreased IAT's but lower underhood temps overall.

 

:word:

 

what about removing the weather stripping on the cowl???

it vents some heat but it doesnt interfere with the aerodynamics because the hood is still in stock position

i really dont know if it helps or not

 

It wouldn't do much, the hood closes and touches the weather stripping, if you remove it, there might be a 1/8s inch of clearance. It won't affect anything but will let water in.

 

maybe the key is finding the optimum angle of the hood. maybe the lift/angle the hood spacers provided was excessive causing turbulence, hence hindering the hot air to exit efficiently.

 

If any thing the hood needs an opening from the front not the back. But that would make the car look even worse.

 

another thing I wondered was whether in conditions where I'd really want venting, like 90f on the freeway in traffic, if the open vents would do more since so much more heat would be trapped and trying to push out the vents and lead to drastic drops, but in the end, I don't know, the car has no torque as it is and I felt a little dumb making drag worse and inviting water into my engine. I've had a LOT of bad luck with my car so that's something I was definitely considering happening, even though I believe everyone's accounts.

speaking of, I have been bored and frustrated with my heat soak at times and been wanting to try to make a custom hood with a vent cut out like this:

Venting your hood

but now I don't know. Honestly so many cars have vents that I really can't imagine is does nothing. like I said, maybe it's more of a difference for hotter temps and turbo'd cars and stuff.

 

omfg i wouldnt ever try to do that myself with my hood, id be petrified that i would ruin it

 

I didnt read the whole thread, but i came to the same conclusion and posted it in the DIY thread, I will try to see if I can find my posts

 

I think I read some of your posts, and I wanted to ask you if you have any numbers. You used scangauge right?

 

Yea, I used a scan gauge, I never really any had any hard numbers, mostly because I was being selfish and just doing the test for my self and didnt put much time in it. I wasn't a fan of how they looked and was only doing it because so many people said it was so much better...


I think I remember that it seemed that the IAT didnt climb quite as fast setting, but I didnt let it set for a long time, nor did I actually time it. But I do know that on average when I had them on I saw a few degrees warmer IAT. I would have gotten more solid numbers but I convinced my self I wanted nothing to do with them since I really didnt like the way they looked and they were making the IAT higher. I could maybe do some tests again so people would start to believe it, I've still got the spacers in a closet some where. Although when I did the test initially I had the K&N Typhoon SRI(v2) now I have a custom K&N CAI(kinda)

 

they still look good

 

say what? since when does making your car look like it got into an accident a good thing?

sorry just my opinion :hiding:

 

haha, to each his/her own. I really wish they had worked. but with only three bolts, I felt I'd rather have my hood flush with the arms anyway. grr.

 

I have an AEM CAI so it doesn't apply to me but in the latest issue of Import Tuner they tested this "JDM Hood Prop" in the Fact or Fiction section. In the article it was tested and they came to a conlusion that it dropped an average of 13.5 degrees fahrenheight all around from stop and go traffic to highway driving. It was tested out on another car (1.6L Miata). I think results are based on the type of car and where the intake is located.

 

got link? I'm interested. 13.5 seems okay. in stop and go it could help.

 

I looked at the website and didn't find it. It is in the Sept 09 issue, page 32. It's got numbers backing it up and it did mention that the aftermarket filter was located right near the header and that propping the hood would be an immediate help irt IATs. Here were the results,

Ambient Temps @ 78 degrees, Intake Air Temps:
Max Temp at idle: Stock hood: 173 degrees, lifted hood: 156 degrees
AVG Temp (driving): Stock: 100 degrees, Lifted: 93 degrees
Low Temp (driving): Stock: 96 degrees, Lifted: 86 degrees


I say from experience to get an AEM CAI. You're in Cali and it is CARB legal, has airflow straighteners, it barely rains in SD (remember in December it rained for a week straight? My filter never got wet), and 70-80 degree IATs (with the weather at 70-80 degrees) FTW! :woot:

 

I mean regardless of intake temps, having a crack right at the top of the hood DOES let out hot air when standing still and during slow driving maybe under 30mph or so.

Its not all about intake temps and HP. Overall engine temps might be lowered with the spacers.
I however hate the look (like the hood is bent from an accident or something) and will not be doing this mod.

 

did you have to cut into the fender to put the AEM CAI? I really didn't want to do that lol. meanwhile, I'll keep an eye out on the forums. I never buy new lol.

hm...well, their data does make sense. why didn't you post this in all the hood spacer threads? In any case, right now, I might just try to do a project and put in a hood vent of my own. lol for now though, I'll just stay safe.

 

I was just browsing the new posts and found this and it reminded me about the Tuner article. Just wanted to add my 2 cents.

As for the CAI install, I did cut the fender liner about 1 mm all around the tube with a dremel. People say water seeps through but it does not rain enough here to disprove that. However, when it did rain hard for that one week I was paranoid as hell driving through puddles but I managed to get over them slowly and everytime I got home, I opened the bumper and checked the filter element. To my surprise it was always dry. I did tape up the hole underneath the car right under the filter element so that may have been the extra protection I needed.

 

so which AEM is the best one? is there just two versions? I hear about two piece and airflow straighteners and all that...haven't done research. lol off topic.

 

haha. off topic. I love what I have now (two piece). No problems or CELs. I heard a lot of bad stuff about the old one with its bogging issues.

 

real interested in that test by import tuner. can you scan it by any chance? I googled it to no avail.