Slater Posted August 10, 2005 Author Report Share Posted August 10, 2005 OK folks, I have an update.I had some tasty ice cold microbrews with Florian last night and he gave me the great idea to try removing the rubber gasket at the trailing edge of the hood.When you remove the gasket there is a 1" gap along the entire length of the hood. The hood is 55" long, so that means there is now a 55 sq in reverse "vent" at the rear of the hood helping to pull hot air out of the engine bay. That is larger than most hood scoops. The WRX scoop is about 36sq in and is less aerodymanic than this setup.Well folks, I saw up to a 10F drop in INTAKE temps by doing this! For the first time ever on the highway the temps dropped and dropped, where as before they would stay the same or INCREASE! The change is increased with speed, so while on the highway @ 55MPH+ there was a 10F drop, but once on regular 35MPH roads the drop was only 5F. The important thing is that there is a drop. When I got home I got out and put my hand over the vent and the heat was POURING out. With the hood seal on all that heat would just be sealed uner the hood baking away like an oven.So now I am down to +30F over ambient temps on my non-EGR setup (EGR disabled only with a 96-98 ECU). I have not tested the chamge with EGR enabled, and I assume it has to be as much if not more of a drop from the +90F over ambient temps I was seeing with the EGR!Anyways, I feel the seal needs to still seal the fuse box. And since I have a 95, my ABS module is exposed. So what I did was cut the seal at 18" or so, and just replace that section of seal. Now when I close the hood the fuse box is totally sealed like normal, and the ABS computer is sealed right above it and 8" or so beyond. More than enough protection. This reduced my vent to 37 sq in, or roughly the same as a WRX scoop.I don't have temp readings with the updated seal setup, but I expect it to be the same as with no seal at all. The reason is that when I got hom and got out of the car and felt where all of the heat was coming from, it was ALL coming from a little past the center of the hood on the driver's side all the way to the end of the passenger side. Well, that is the section where the seal is removed on my partial-removed setup, so I think I will still see the same temp drops with the partial vs full seal.by the way I will install an underhood temp gauge soon. The readings I have been taking are intake temps, so if I saw a 10F drop on intake temps I think the underhood temps at highway speeds are only a few degrees over ambient. It has to be to be able to cool the intake that much. I have not checked oil or water temps but I expect those to go down as well because all the hot air that is extracted from the intercooler and radiator now has somewhere to go, constantly being replaced with fresh ambient air. Florian saw a dramatic decrease in water and oil temps when he installed his heart-shaped scoop, and I feel this vent should be as effective as his. I just need some temp readings to back it up.Anyways, there is nothig to lose with this mod. It costs nothing and literally takes 30 seconds. The beauty is that it looks 100% stock, and can be reversed at any time.Just pull your seal up starting at the passenger side, measure 18" from the driver's side end and cut it with a pair of scissors. You just added a vent to your hood that is as if not more effective than a WRX scoop. And if you really want a change you can add washers where the hood bolts to the hinge (i.e. between the hood and hinge). Even adding 1/4" of washers will increase the size of the vent back to 55 sq in (1.25"x37). And @ 1/4" lift in the rear there is still enough rubber seal left to seal the fuse box and ABS computer. That is the next step to try. If it doesn't drop temps more I'll remove the washers. But if it does....Thanks again for the beers Florian!- Slater Link to comment Share on other sites More sharing options...
WhiteT5 Posted August 10, 2005 Report Share Posted August 10, 2005 that's what the EGR bypass I am working on cooking up will take care of.←I'm just going to concentrate on bypassing the EGR system altogether and working on other ways to cool down the underhood and intake temps.←All those that agree Slater is the man, say "I".I ! Seriously Slater, the effect you demonstrated that EGR has on IAT's is huge! The amount the temps were lowered, it seems, is more effective than adding an Atech intercooler and water injection together. I had a burning hate for EGR even before you brought this up. It makes pulling the manifold, which I've done twice, a royal PITA. Those bolts are positioned as if they were never to be removed! Seriously, you make something to get rid of this blasted craptastic "emissions control" device and I'll be the first customer.EGR came standard on the '94 and '95 model year cars. Maybe on the '93's also, but I'm not sure and I'm too tired to bust VADIS out right now. Link to comment Share on other sites More sharing options...
thelostartof Posted August 10, 2005 Report Share Posted August 10, 2005 just fyi for those who might do this and remove/bypass your EGR if you are in a smog state hope to hell that you can still pass. as tampering w/ a federal emissions device is a bit of a fine .... and remember if you REMOVE it that engine tag still says your car came w/ EGR so good luck replacing that and or trying to prove that your car has a later model engine w/ no EGR in italso 30+ over ambient? wow w/ my big powerstroke intercooler and 15g my intake temps are right @ ambient ... and i even have EGR on my car and that whole venting the hood is a nice trick all the old hot rodders used to do that .. hell i did that on my 77' firechickentho a quick and easy bypass is a later model ECU w/o EGR, a cap for the exhaust manifold(prob 18mm thread) and then a block off plate for teh intake which is prob the same plates the older RWD cars had extras of on thier intakesprops and good work on doing all this effort Link to comment Share on other sites More sharing options...
Guest DougK Posted August 10, 2005 Report Share Posted August 10, 2005 Im glad I was the only one who thought about that gasket... I had it off when I was working on my car the other day.Going to do that on the drive home today. Link to comment Share on other sites More sharing options...
Slater Posted August 10, 2005 Author Report Share Posted August 10, 2005 Im glad I was the only one who thought about that gasket... I had it off when I was working on my car the other day.Going to do that on the drive home today.←What's the material? Link to comment Share on other sites More sharing options...
Slater Posted August 10, 2005 Author Report Share Posted August 10, 2005 just fyi for those who might do this and remove/bypass your EGR if you are in a smog state hope to hell that you can still pass. as tampering w/ a federal emissions device is a bit of a fine .... and remember if you REMOVE it that engine tag still says your car came w/ EGR so good luck replacing that and or trying to prove that your car has a later model engine w/ no EGR in italso 30+ over ambient? wow w/ my big powerstroke intercooler and 15g my intake temps are right @ ambient ... and i even have EGR on my carYeah, so is running no cat, but plenty of people do that.The way I am doing the EGR, it will be 100% undetectable.As far as the temps, numbers don't lie. I'm curious what the temps do once I install this nice Atech intercooler.by the way, how exactly did you get your intake temp readings? Link to comment Share on other sites More sharing options...
thelostartof Posted August 11, 2005 Report Share Posted August 11, 2005 yes the cat can be swaped in and out very easy ... its what V band clamps are for hahai'd love to see how you bypass this EGR setup as you'd have to block that hole in the exhaust manifold before the gasses even get into the system as if they do and have no place else to go that can cause all kinds of problems w/ the engine and exhaust pressure.... the pipe from the valve to my intake blew a nice 1 inch hole in it because of it being clogged so ... fun timesIAT right on the intake manifold right below the EGR outlet port Link to comment Share on other sites More sharing options...
Guest DougK Posted August 11, 2005 Report Share Posted August 11, 2005 What's the material?←the rubber one that seals the cowl to the hood. Link to comment Share on other sites More sharing options...
Ping138 Posted August 11, 2005 Report Share Posted August 11, 2005 So have we figured out how to rid ourselves of the EGR pest yet for those of us with a 95 car and a 95 ecu? Link to comment Share on other sites More sharing options...
ziddey Posted August 11, 2005 Report Share Posted August 11, 2005 So have we figured out how to rid ourselves of the EGR pest yet for those of us with a 95 car and a 95 ecu?←haha it's only been two days so far. Although I'm ansty too! And Slater, you said egr was a pain to reach, so it'd be nice if I could just find a way and then block off both ends of the rubber hose. Wishful thinking eh?Also, you with the IAT, it makes me wonder. Back to the horn relocation that everyone does and love doing. I wonder if you'd be able to register any temp. differences with your sensor from the horn relocation mod.:) Link to comment Share on other sites More sharing options...
EricF Posted August 11, 2005 Report Share Posted August 11, 2005 I posted a ghetto way to get rid of it that actually worked, one that I actually did awhile back. Link to comment Share on other sites More sharing options...
ziddey Posted August 11, 2005 Report Share Posted August 11, 2005 I posted a ghetto way to get rid of it that actually worked, one that I actually did awhile back.←so no CEL, no limp mode, lower temps? sounds good i'm going to have to search! Link to comment Share on other sites More sharing options...
EricF Posted August 11, 2005 Report Share Posted August 11, 2005 so no CEL, no limp mode, lower temps? sounds good i'm going to have to search!←Eh, no CEL? :-P I guess you could keep it from throwing a CEL by leaving the EGR valve in the engine bay somewhere, plugged in.I posted it in this very thread, a couple pages back. I messed up on blocking off the EGR valve part on the intake manifold (was tapping to put a bolt in the hole, and the tap broke off in it so I just sealed the tap in), but it worked. Link to comment Share on other sites More sharing options...
lax01 Posted August 11, 2005 Report Share Posted August 11, 2005 sounds like something I would do :P Link to comment Share on other sites More sharing options...
StickThatClutch Posted August 11, 2005 Report Share Posted August 11, 2005 sounds like something I would do ←Look what I found! :josh: Link to comment Share on other sites More sharing options...
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