cobb

Ive been look at a few things short of a turbo or super charger for more on my xb. I see the lighten pulley is offered for it and a throttle sparer from fast scion http://www.fastscions.com/Scion-2AZF...cer-tC-xB.aspx

I know the lighten pulley lets it roll up faster, but does it really give those claims and are there any on going side effects? 5hp, 6tq? I thought at one time the lighten crank pulleys were causing engine problems.

The throttle spaer kind of took me by surprise. I know with a carburator engine a space can aid fuel dispurstment in the air. But 3hp, 5tq with direct fuel injection?

What about the intake manifold? http://www.fastscions.com/scion-tc-x...-manifold.aspx Bolt on 50hp? Thats got to be a mistake.

Just looking for some stuff to do to help fuel economy a bit short of any exhaust mods. Looking for a short ram to suck in the heat from under the hood vs a cai. Think best maybe to use a reusable filter and remove the vacuum cleaner hose from the air box.

Thanks.

ack154

iTrader: (7)

RE pulleys, this is worth reading:
https://www.scionlife.com/forums/viewtopic.php?t=248746

As for the intake mani, read the fine print... the 50 hp is on some Mitsubishi applications. I have no idea what it makes on any of the Scions, but I guarantee it's nowhere near 50 hp.

The throttle body spacer will do NOTHING for you. Don't bother.

cobb

Thanks. Seems there is a lot of snake oil type of products for the xb2. Guess the cai is the only real efficenicy upgrade?

ack154

iTrader: (7)

Well I'd say the underdrive crank pulley is worth it. I have it on my tC and it makes a nice difference in throttle response. Revs a bit quicker and theoretically "frees up" horsepower. Couldn't tell you how much though. But for the money, I think it's a nice upgrade.

The CAI would be a mostly noise thing I think. I mean, there is a gain, just not a lot for what many of the companies charge.

AAG

iTrader: (1)

Dont waste your money on those mods, they will do very little. If you havent already, mod the suspension and get better tires. The only go fast mods worth it for the xb2 is boost.

cobb

I think you are right. Loved my supercharged tacoma. I see its discontinued for the xb, but guess I could call around til I found one.

I like the idea of the crank pulley, but sometimes I do idle and leave the ac or heat on for my passengers when I run in a store. I noticed my tacoma and metro will have the headlights dim at idle vs driving. Hate to come out to my car and find it over heated and battery died and it stopped running as boththe water pump and alternator were not turning fast enough.

Steve60

The intake manifold could be worth it. If there is anyone with this intake, on a NA, please post some info.

buickid

The mani might be good on a FI car, as our stock manifold may be plastic. Otherwise you might need aftermarket fuel managment.

jthistle

Efficiency mods that also help with performance
Pulleys: Lightweight if you don't want to deal with charging issues
Rims: Lightweight wheels take less energy to move.
Lowering springs: Less air under your car less drag
Under body panels: DIY better than lowering for less drag
Smaller mirrors: Less drag, most states don't require passenger mirror
Lose weight: Applies to car and driver

Efficiency not performance
LRR Tires: Great for mpg but sacrifice grip

Performance mods that may or may not help with efficiency
CAI, Exhaust, Intake manifold: more HP high RPM, less torque low rpm (idle-2500rpm). Usually better mpg if you drive fast but worse mpg if you keep your rpms down

Strictly performance forget mpg
FI

kidd

this would help more than a header. i think
http://www.fastscions.com/scion-xb2-...-pipe-2.5.aspx

NonStopTuning

iTrader: (1)

NST Underdrive Crank Pulleys are SPECIFICALLY designed with all these concerns in mind. No NST pulley user has ever reported any issues of any kind with these pulleys on the tC and the xB.

All NST pulleys are designed to be excellent upgrades for BOTH street and track.

A-snell

iTrader: (4)

What is this?

cobb

Looks like great advice. Guess I can not complain if my 30mpg includes 3 large adults and 2 rolling walkers?

jthistle

On this S2000 website there is a thread about a carbon fiber complete under body panel with a diffuser and a lot of good pictures.
http://www.s2ki.com/forums/index.php...#entry13887936
The panels keep air flowing smoothly down the underside of your car. This is really expensive. Here is an example of a DIY panel.
http://ecomodder.com/forum/showthrea...tray-3346.html
The DIY panel is made from Coroplast which is the stuff that political signs are made from now. Its cheap 4'X8' sheet for ~$30 and durable.

TrevorS

iTrader: (1)

[quote="NonStopTuning"]Perhaps I'm weird, but I use an Agency Power light weight pulley -- no drive reduction and so no loss of accessory capability.

NonStopTuning

iTrader: (1)

[quote="TrevorS"]Nothing wrong with the AP pulley. We sell a very similar stock diameter crank pulley called the NST CR-Lite Crank Pulley. This pulley is very popular with those using the TRD SC.

If you want to go one step further and get better power delivery to the wheels as well as better gas mileage, you can step up to the NST Underdrive Crank Pulley.

If you want to go two steps further, get better hp and tq delivery, get even more weight reduction, and have no worries about lights or batteries, you can step up to the NST Underdrive Crank Pulley AND NST Alternator & Water Pump Pulley Kit.

Either way, good luck and have fun with all your projects!