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Old 06-22-2017, 11:39 AM   #11 (permalink)
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Topoff (RIP) - '92 Geo Metro LSi
90 day: 48.54 mpg (US)

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90 day: 27.11 mpg (US)

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Quote:
Originally Posted by Ni87 View Post
One of which was deleting the cats and putting in o2 fowlers to keep me from throwing codes. This was good and made the truck sound better but it didn't really free up any extra mpgs.
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So I deleted the egr
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we wanted more smoke. (This is the part of the thread that you find out that I'm still a child) so that's when we decided to do the atf. And let me tell you we could completely smoke out four lanes. Not recommended but it was fun for a day.

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Old 06-23-2017, 05:29 AM   #12 (permalink)
It's all about Diesel
 
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Seriously not trying to be a butt, but why do people buy vehicles with absolutely horrible mpg, and then want help trying to squeeze better mileage out of it?
Sometimes it's due to another feature that such vehicle is going to provide. Anyway, why not trying to improve the mileage and turn an otherwise gas-hog into something more suitable to oneself's needs or personal preferences? Not everybody is really willing or even able to get all the compromises inherent to a subcompact.
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Old 06-23-2017, 09:53 PM   #13 (permalink)
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Bernard - '00 Nissan Xterra Se

Super civ - '98 Honda Civic Si (aka dx)
90 day: 47.57 mpg (US)
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Okay. So I guess I should explain somethings.

First off yeah you're right if I want a fuel efficient car I should have bought one. However this is the vehicle I wanted already knowing that it has poor mileage. on that note mechanics is also what I enjoy doing. And I like to make things run better and more effieicent. Doesn't matter what vehicle I have I still do try to make the vehicle a little more efficient.

Egr- I know most people get pretty uptight on this topic. My view. I think it's bad. I don't like the idea of exhaust getting pumped back into my intake. Resulting in excessive carbon deposits in my intake manifold and my combustion chamber. The carbon build up results in hot spots that are prone to predetonation and knock which cause ignition timing to retard resulting in lower power and efficiency. And don't forget those carbons that deposit also flake off and can cause damage to your cylinder walls and valves. The carbon deposits are like sand. So no thanks. Also any vehicle I've tried the egr delete has resulted in better fuel economy. Some other people say it doesn't work but for me it has made a significant difference every time. And for the xterra it gave me a solid 2-3 mpg. That was tested abab.

Also the cats getting drilled out and not making a difference. On my previous vehicle it made a noticeable difference. I can't really do an abab test because it's kind of a permanent fix. However if you look at the original xterra manifolds compared to the new stainless headers you would understand why drilling the cats out didn't make a difference. The original cast manifolds have an extremely high restriction design due to the small space to put exhaust I would assume. Either that or Nissan just hates me I don't know. But anyway the manifold goes from rear cylinder to the front cylinder and then does a 180 to the downpipe. If I could upload pictures from my iPhone I could show you more. But I'm assuming that the cat delete didn't make a huge difference because of the extreme restriction of the stock manifold.

But I've been really happy with the results with xterra so far. Efficientcy has improved quite significantly from 13mpg to 22mpg. Also it has quite a bit more power now which is another good plus. Also the engine runs smoother and I've gained 2" hg at idle and my highway is now 12-15"hg as apposed to 8-10"hg.
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Old 06-23-2017, 10:00 PM   #14 (permalink)
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Bernard - '00 Nissan Xterra Se

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90 day: 47.57 mpg (US)
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Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
Sometimes it's due to another feature that such vehicle is going to provide. Anyway, why not trying to improve the mileage and turn an otherwise gas-hog into something more suitable to oneself's needs or personal preferences?
Yes exactly. In my opinion if your vehicle has poor mileage you have the perfect excuse and also more initiative to make the vehicle more efficient.
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Old 06-24-2017, 06:48 AM   #15 (permalink)
It's all about Diesel
 
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Sure, with more room for improvements and considering that any increase in efficiency represents a greater overall improvement compared to what could be done in a smaller and inherently more efficient ride, it's worth.
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Old 06-24-2017, 11:43 AM   #16 (permalink)
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Bernard - '00 Nissan Xterra Se

Super civ - '98 Honda Civic Si (aka dx)
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Has anyone here done water injection?
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Old 06-24-2017, 06:43 PM   #17 (permalink)
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little jona - '91 Dodge D 250 first gen cummins LE
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Last 3: 24.65 mpg (US)

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I know an old Jag mechanic that figured out the size hole to drill in the cat. He would open the cat enough to see the performance gain you got. But leave most of the cat in place. He worked in a emissions compliance stateback in the 90's AKA California so the cat was mandatory for smog testing by only removing part of the cat, enough of it was still there too cause it to heat up(read still working but to lesser degree) allowing it to pass emissions temperature testing, some of his customers were race use 90%, street 10% . Race use will kill a cat quick . With his mod a 1" hole through the honeycomb the cats stoped melting.
At WOT the engine will go rich trying to cool the cat, this loads up

As to ,emission equipment forces an engine to run cleaner I call BS on anything pre fule injection

On my old 79 3/4t 4x4 Chevy 7.5mpg up hill, down hill, always (with 1 exception with a car trailer loaded with 10,000lbd of cinder blocks +1000 in the truck 17000gross ofer a mountain pass droped me to 7.0mpg). Pushing about 400hp it almost failed smog exam for being too clean. 2years later the almighty CARB decided to hit smog teck personally for a car failing a random roadside inspections (this was later thrown out by the courts too late for me but I got test data). My truck had been rebodied aka Salvage Title, before I got it. So had none of the stickers telling them what was required. So I went from 49 state heavy duty emissions that only required 3 things pvc, factory air cleaner , and heat riser(self adjusting warm air intake) all gear I'd run required or not, even as an 18 yo kid. Over $1000 in USED parts and $500 in new parts . I passed the visual inspection, all there bs in place. The gas test was on the high side almost a fail . There smog gear cost a full mpg 14%loss(there equipment cost 2X the fuel towing 10k . Shortly after Enlisted in the Army. And moved to Kansas and left there crap in Ca (with a gain to 14.5mpg going from CA to KS and an average of 9.5mpg) added msd complete system , probillit distributor, MSD 6 digital control box and an Edelbrock RPM Air Gap intake.and 1406 carb(600cfm ) And a custom built Th400/Np205 with low stall tork converter 700rpm lockup. Idle was 450rpm by 800 all 4 tires were turning wether or not the truck was moving.

Now dont get me wrong epa has done something good, air is breathable in LA agen.
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'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


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Old 06-24-2017, 07:15 PM   #18 (permalink)
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Sub - '84 Chevy Diesel Suburban C10
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90 day: 30.21 mpg (US)

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Or how far you drive it.
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Old 06-24-2017, 11:13 PM   #19 (permalink)
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Green Bean - '92 Honda Civic VX
90 day: 65.2 mpg (US)

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Air up your tires to a much higher psi and coast far my friend.

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Tags
fuel efficient, green xterra, modifications., nissan, water injection

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