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Unread 04-17-2012, 11:10 AM   #16
ThomasYJ
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1993 YJ Wrangler 
 
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damn dude... thats a helluva long, restrictive straw to be breathing through. I can see why your mileage tanked. Maybe it's time to find a place to patch that hole.... and cut another one.
so what do you think you'll do now?

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Unread 04-17-2012, 05:57 PM   #17
fawr
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yeah...but 4" PVC is a little absurd!

I re-engineered the air box today, taking a hint from one of the forum members and ditching the factory air box for a sewer elbow. the air comes in at a 90 degree to the filter now and that's all under the hood. I'll post pictures once I get home again. I gained a few back to 12.5-15 mpg as I tested it out today (and that's running two high performance filters in line (don't want to drive around with an open pipe...

My ram came in today, once I replace the stovepipe filter with the ram I hope to see some gain in mpg as well (hoping to catch some high pressure at the top of the windshield.
Thanks to everyone for giving some great ideas!
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Unread 04-17-2012, 07:35 PM   #18
rdsk8ter
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I have 3" on mine and it works great no difference



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Unread 04-18-2012, 01:25 AM   #19
ClimbStuff
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Quote:
Originally Posted by fawr View Post
yeah...but 4" PVC is a little absurd!

I re-engineered the air box today, taking a hint from one of the forum members and ditching the factory air box for a sewer elbow. the air comes in at a 90 degree to the filter now and that's all under the hood. I'll post pictures once I get home again. I gained a few back to 12.5-15 mpg as I tested it out today (and that's running two high performance filters in line (don't want to drive around with an open pipe...

My ram came in today, once I replace the stovepipe filter with the ram I hope to see some gain in mpg as well (hoping to catch some high pressure at the top of the windshield.
Thanks to everyone for giving some great ideas!

What the...

One filter... 1. You can have be inline, or capped, but just 1. You've heard of water boarding right? That's what you're doing to your engine... minus the water.
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Unread 04-18-2012, 09:55 AM   #20
ThomasYJ
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Quote:
Originally Posted by rdsk8ter View Post
I have 3" on mine and it works great no difference


heyyyy that's pretty snazzy!! and on a 4.2 no less! This picture here, I take it that's your glove box?

def x2 on getting rid of one of those 2 filters, I'd say the first one. No need for it really, and it just makes it harder to breathe.
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Unread 04-18-2012, 07:24 PM   #21
rdsk8ter
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yea its run where the glove box should be Ill eventually make a smaller glove box but not yet
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Unread 04-19-2012, 07:29 AM   #22
paulyboy
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I know I have a ZJ but when I did mine I didn't notice any horrible loss im mpg and i made mine 2.5 inch piping. You can hear it suck air but man when the jeep gets dirty I just attach a hose and use it as a shop vac.



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Unread 04-19-2012, 10:16 AM   #23
fawr
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no no silly, i wouldnt run two filters under any any regular circumstances, just while i tested the new filter in the elbow, i kept the stovepipe filter on the top end so nothing would fall down inside. i drove it maybe 5min to test out the setup. then took off the stove top and put the ram on. photos added here:

https://picasaweb.google.com/1040004...eat=directlink

then i decided i didn't like the ram top....! no noticeable difference and ugly to boot.
so.... i ditched the elbow filter, put the stovepipe back up and reworked the airbox connection ( the area where it would be...)...photos also here:

https://picasaweb.google.com/1040004...eat=directlink

what do you guys think about this setup? shoot holes in it please...mpgs are 13.5-19! depending on wind direction!

bw

Last edited by fawr; 04-19-2012 at 01:08 PM..
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Unread 04-19-2012, 06:31 PM   #24
abrooks4u
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My mileage went down over the last few months... I think cause I went up on tire size but my check engine light would come on and go off and would never be on when I had a chance to scan it... so yesterday it did and the TPS was bad... hope it improves now
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Unread 04-19-2012, 06:35 PM   #25
abrooks4u
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@paulyboy ... Bucket Head's pretty cool man... lol
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Unread 04-19-2012, 06:43 PM   #26
abrooks4u
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Have you tried a bigger cold air box?
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Unread 04-19-2012, 07:50 PM   #27
Jeep-N-0311
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A couple of thoughts;
A) As has been pointed out many times, that's a L-O-N-G path for the air to travel;
B) every tight bend in that path creates friction on the airflow;
C) That flex pipe (and there's a LOT of it) has 2 issues;
1) because it IS flex pipe, it'll flex inward as vacuum is drawn by the engine intake; &
2) due to it's shape (plus the shape it assumes under vacuum) all those ribs (and spaces between) create disruption to smooth airflow;
D) In addition to the (old) cap-type being in a low-pressure zone, its shape may receive air-force from the forward side (not that much, since it's a semi-solid wall, it'll actually build a wall of air in front of the filter), but it's creating vacuum on the rear side (higher % than force on the front side) - the faster you go, the greater the vacuum.

Something you might want to consider about the new ram-air intake; put some ribbons (like the tassels on a little girl's bike handles) around (as in, "in the area of" ... like, on extensions) the intake, and, as you drive - check out how they blow around. This will give you a visual indication of how effective the the scoop actually is at "air-ramming". You might end up undercutting the scoop to increase airflow into it (or something).

As for the suggestion about placing the intake in the high-pressure area at the windshield base ... I guess, if it works for you, then it works for you; but I don't know why someone would go to the trouble (+ cost + cut up the hood) to raise the air intake only 3-5 inches.

Just my $0.02


NOT to hijack the thread, but ....
BTW - anyone know a good seal for the MC2100/2150 from the snorkel piping? Will the intake head from a later 4.0 (fuel injected) work? Will the TJ intake cap (as shown in the OP's photos) fit and seal?
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Unread 04-19-2012, 11:05 PM   #28
fawr
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Been thinking of that flex pipe...I think an elbow off the carb with a straight pipe to the passenger side and out the fender... close up the hole I put in the front. Anywho I think this thread has served its purpose! Thanks everyone!
BW
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Unread 04-20-2012, 01:04 AM   #29
rdsk8ter
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I give up whats the clear tube going to?
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Unread 04-20-2012, 01:54 AM   #30
hzryr61
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Quote:
Originally Posted by rdsk8ter View Post
I give up whats the clear tube going to?
HAHA, I was thinking the same thing! (but it does look cool)
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diy , homemade , mods , mpg , snorkel

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