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Old 05-14-2006, 10:56 AM   #1
illegal2.2
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Default Cheap mods? TAKE A LOOK!

anyone heard of the Throttle Bypass Coolant mod? i've heard it's suppose to up your performance by taking the IN line of the coolant on the throttlebody and putting it into the OUT...can anyone verify this and if anyone has done it, is there a difference...

-lastly, anyone has done a EGR delete? this seems to be reasonable and both of these are rather cheap or free mods here's the link where i found the egr delete info.
http://www.mnsubaru.com/forums/showthread.php?t=11439
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Old 05-14-2006, 11:01 AM   #2
Wiscon_Mark
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I wouldn't do an EGR delete, getting junk (air, basically) out of the crankcase is actually conducive to good performance.

The TB bypass mod seems like a lot of effort for relatively no gain. However, it is free.
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Old 05-14-2006, 03:22 PM   #3
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Quote:
Originally Posted by Wiscon_Mark
I wouldn't do an EGR delete, getting junk (air, basically) out of the crankcase is actually conducive to good performance.
That's not how the EGR works. It bypasses some of the exhaust back into the intake to lower NOx emissions and effectively lower the engine's displacement for better economy and emissions during part throttle cruising.
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Old 05-14-2006, 05:00 PM   #4
Patrick Olsen
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If you want to adversely effect the efficiency and emissions compliance of your engine, go ahead and do both free mods. Just don't expect your car to perform any differently.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 05-14-2006, 05:08 PM   #5
Wiscon_Mark
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Quote:
Originally Posted by MCarp22
That's not how the EGR works. It bypasses some of the exhaust back into the intake to lower NOx emissions and effectively lower the engine's displacement for better economy and emissions during part throttle cruising.
Well, I know that. But the PCV system is connected to that as well, and "positive crankcase ventilation" means that it gets the exhaust gasses that slip by the pistons back into the intake so you don't get large amounts of pressure in the crankcase, which would hurt performance. I wouldn't cap that off.

And as patrick said, it really won't make any difference.
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Old 05-14-2006, 05:17 PM   #6
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The EGR and PCV are connected? That's news to me.
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Old 05-14-2006, 05:56 PM   #7
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They are from what I can see.
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Old 05-14-2006, 06:02 PM   #8
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that dude is selling 2 brass plugs for $20 that you can get from home depot for $1.25 each...

what a moron.
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Old 05-14-2006, 06:43 PM   #9
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I like the TB coolant bypass mod. From what I can tell, the entire purpose of running coolant through the TB is to keep it from icing up. Down here in the south, we don't really have to worry about anything icing up (except our freezers).

I'm planning on doing that eventually (whenever I get the motivation to do it), but I don't see it as a reasonable option for you guys up north.

Maybe you could set it up on a valved bypass thingy, so you can circulate through there over the winter but bypass it during the summer........
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Old 05-14-2006, 09:45 PM   #10
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Icing up? If you can start the engine, and it gets to operating temperature, could it possibly ice up? In a temperature where that could possibly happen, the humidity would have to be in the basement.

Sorry, but I don't buy it, and I can't imagine that there is any noteworthy horsepower gain from eliminating it.
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Old 05-15-2006, 09:23 PM   #11
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while this doesnt pertain to these cars. The chevy 5.3 motors and 5.7 found in camaro's etc.. also have collate running threw the TB to keep it from freezing. With out any other mods and just doing a TB bypass they normaly gain 2-4hp at the tires from the intake air being much cooler without the hot coolant running threw it. This makes perfect sense as cooler air is more dense air and makes more power. My fathers 2002 chevy avalanche with nothing more then a cai,and TB bypass dropped 3.tenths off his 1/4 (again this isnt a legacy just showing some points). Every little bit helps ot get the car moving quicker. But just so you know EGR isnt used at WOT so it wont effect performance at WOT at all. But the TB by-pass i think is a great mod to do.
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Old 05-15-2006, 10:19 PM   #12
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nice....i've heard many mnsubaru members doing this mod to their n/a subies also...very pleased from what they told me and what i've read.....also..how about a fuel pressure regulator...i've heard that this mod can increase HP also....help me out being a NOOB!
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Old 05-16-2006, 02:58 PM   #13
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I've done the coolant bypass on all vehicles I've owned over the past 20 years. I did it on my 98 Impreza and want to do it on my 05 LGT but it's really tight down there. I really couldn't feel a difference but it certainly can't help performance to run hot coolant through the throttle body. I believe the purpose isn't to avoid icing but to help cold start driveability and emissions. I've also disconnected the EGR on all my cars that had it. Disconnecting the EGR tended to trigger a CEL on my 98 Impreza. The EGR on the Impreza seemed odd because it was mounted on one of the intake runners half way down toward one cylinder. I don't see how it would work effectively when exhaust gas was only going into one cylinder. The EGR and PCV systems are totally separate. PCV is necessary to purge those vapors out of the crankcase although you can vent them to the atmosphere and not back into the intake stream.
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Old 06-06-2006, 04:18 PM   #14
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Quote:
Originally Posted by legacydreamz
that dude is selling 2 brass plugs for $20 that you can get from home depot for $1.25 each...

what a moron.
Wow. Plus, you don't even need them -- I just removed the return hose and connected the other one where the return went. I have a 3/8" barbed fitting, first $1 takes it. That's cheaper than Home Depot!
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Old 06-06-2006, 04:27 PM   #15
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Quote:
Originally Posted by MCarp22
That's not how the EGR works. It bypasses some of the exhaust back into the intake to lower NOx emissions and effectively lower the engine's displacement for better economy and emissions during part throttle cruising.

I think he meant that you will have ecu issues by messing with the emissions. This WILL cause problems with idle...
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Old 06-07-2006, 01:27 PM   #16
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I just did the TB bypass today. I haven't driven the car yet, but good god is it a PITA. Its tight in there and the hoses are actually 5/16 I.D. as far as I can tell, so the 3/8 fitting I bought based on this how to article was a pain to get in there. Very tight and frustrating in there is all I have to say.
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Old 06-07-2006, 03:11 PM   #17
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tell us if it's worth it!
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Old 06-07-2006, 04:06 PM   #18
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I didn't notice anything...? Not worth the headache of getting in there.
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Old 06-07-2006, 04:14 PM   #19
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I'm probably going to do the coolant bypass mod when I have my TB out while installing my i/c.
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Old 06-07-2006, 06:07 PM   #20
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Quote:
Originally Posted by IronMonkeyL255
I'm probably going to do the coolant bypass mod when I have my TB out while installing my i/c.

I wonder how hard it would be to cycle the window washer fluid through this area? This fluid could be cycled through the area and back to the tank, to help cool down the TB... Just before you launch, you run the pump for about 20 seconds...
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Old 06-07-2006, 06:14 PM   #21
IronMonkeyL255
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And when you know you're going to be driving spiritedly, throw some ice in there.

It's like a ghetto AWIC.

Honestly, I don't think it'd be all that hard. You would probably need to outfit a larger pump to the tank for any significant flow, though.....
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Old 06-07-2006, 08:29 PM   #22
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Quote:
Originally Posted by IronMonkeyL255
And when you know you're going to be driving spiritedly, throw some ice in there.

It's like a ghetto AWIC.

Honestly, I don't think it'd be all that hard. You would probably need to outfit a larger pump to the tank for any significant flow, though.....
I know, I know... it sounds ghetto, but I figured if you were going through all the trouble to do this mod, you mind as well hook up SOMETHING to the TB...
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Old 06-07-2006, 11:34 PM   #23
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I cant see why you would do either of the mods. doesnt make any sense
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Old 06-08-2006, 03:55 AM   #24
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Quote:
Originally Posted by jonnyg113
I cant see why you would do either of the mods. doesnt make any sense
because you are bored...
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Old 06-08-2006, 11:26 AM   #25
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agreed^
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