I'm starting this thread to hopefully be a repository of mods, information, etc. to up the MPG of the Scion xB. I figured either posting items here, or links to them here would make it easier for xB MPG geeks to find it all.
(Note: this applies to the 1st gen 04-06 xB, as the 08+ are on a different chassis)
To that end, here are a few pieces of info I've come across that look to be helpful:
Plug gap: .044 (according to some sources, see comments below for discussion of this vs .032 factory gap)
OEM plug: Denso Spark Plug K16R-U ND
personal recommended replacement: NGK G-Power BKR5EGP(part #) 7090(stock #)
Scion recommends using GL4 fluid in manual transmissions. They shipped with GL5 however, which is corrosive to the brass parts in the transmission. So a transmission drain & refill (with a good synthetic fluid) will likely extend the life of your transmission, it only needs 2 quarts to fill it.
JanGeo: Where did you get that gap range? Everywhere I've seen gives a gap of .044(I miswrote it in my first post), and I haven't seen a gap range (rather than a specific number) for a car for ages.
I am running my plugs at .044... Perhaps we should try it out with the Scangauge Jangeo?
I wonder just how much the gap would change FE.
Jan I am curious to know how you did your grill block. I am not happy with the intake temps I am seeing while driving. (average 33*f)
I think I could tweak a few more MPG with a block.
Have you guys weighed any parts on the car?
I am wondering how much the stock hubcap wheels weigh?
I have the swirly style Scion wheels (with tires they weighed 26lbs) I believe Scion life said 16lbs for the wheels themselves?
it would be nice to pull together and compile some sort of weight list for the XB parts. (All of them)
(I removed all the trunk crap: Cover/spare/tools for a total of like 30lbs)
Are you two running stock intakes? I am still stuck with this AEM unit.
I don't really want to sell it, but rather install an OEM and test/compare first.
Also what elevations are you at? (I am around 952asl).
Order some golf shoes, otherwise we might never make it out of this place alive.
The bigger gap will probably help with cold running and starting but may cause a little skipping at full throttle and high rpm. I was told by a friend who races not to change the factory gap and mine were very accurate at 0.81mm / 0.032" for all four.
My grill block is the regular 1/2 inch white packing foam sheet cut a little larger than the opening and just stuffed into it. The stuff is non-porus and doesn't seem to break down with age or sunlight. I left a little opening behind the license plate for some cooling but anything over 30mph for any distance in 40 degree or higher temps and I have to remove the bottom block or it will get too warm. The extra temp from the block helps warm up the whole front drive train and after about 15-20 minutes warming up it really starts to get into the 40 mpg range. Just have to watch the temps as it can climb past 190F really quick going up a hill.
Everything is stock in my xB except for the Synlube and I use GP7 Torco and Acetone in the gas but didn't use Acetone for the last two tanks before my inspection which is due this month just to see what readings it gets without it.
Wheel weight - I have the stock Steel wheels and 9 spoke hubcaps and I keep forgetting to record the weight in my Scion notes when I have them off but I do have the tire itself at 16lbs.
Altitude under 300 feet and usually about 20-100 feet above sea level - live by the Ocean on an Island btw.
Tire info from ScionLife post
Scion xA and Scion xB Specifications:
Bolt Pattern = 4x100
Center Bore = 54.1mm
Nut Size = M12x1.5
15"x6" +38 offset / 185/60R15 xB 185/60R15 xA 185/65R15 bB
37 lbs per wheel & tire = if tire is 16 lbs then steel rim is 21 lbs
Alloy wheel: 16.7 lbs
Other Vehicles With Interchangable Wheels
Toyota Celica (1988-1989)
Toyota Corolla (1988-2001)
Toyota Corolla Wagon (1988-1996)
Toyota MR2 (1986-1990)
Toyota Tercel (1989-1998)
Toyota MR2 Spyder (2000-)
Yeah every time I look at mag wheels they always price the light ones in the $400-500 + range for a set of four. I also have to wonder about the balance of them with stick on weights and what a pain that can be. I have heard that some Monroe shocks really improve the ride. Around here we have a lot of frost heaves that stick up and really pound when I drive over them knocking things around in the car like crazy and running higher pressure in the tires doesn't help that at all.