TRD Performance: FJ Cruiser Gets Supercharged | Expeditionr

15 Июн 2015 | Author: | No comments yet »
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TRD Performance: FJ Cruiser Gets

When I initially purchased my FJ Cruiser, engine performance was the thing on my mind. The 1GR-FE engine had more than pulling power to meet the of the everyday driver.  Even the stock weight of an FJ Cruiser at 4,300 pounds posed no for this well-built engine. But as went on and the upgrades continued, the love handles began to and performance wasn’t what it to be. Mind you, adding on skids and a bumper isn’t to turn the FJ into a complete But over time, those who in the heftier upgrades will no begin to notice performance Knowing that my upgrade were far from over, I it was time to begin looking for ways to boost the FJ’s And rather than building in small increments through and high-flow exhaust systems, I to go with a supercharger solution. At the of this decision, there two possible supercharger systems one from Toyota Racing (TRD) and an alternative system by a company named Underdog Development or URD for short. Both were great systems but had their pros and cons.

One of the advantages to the TRD supercharger is that completely covered by factory The caveat to this is that you have a Toyota service perform the upgrade which no do-it-yourself installations. The URD supercharger is not covered under factory – in fact it will no doubt your factory warranty or at least the drive-train portion of it. But the URD has the of providing a significant increase in horsepower and torque, much so than the comparable TRD system. So if looking purely for speed and performance, there’s no question URD should be your first

The TRD supercharger system is a Roots-style produced by Eaton, whereas the URD uses a centrifugal Rotrex design. I’m still in the process of all the differences between these two as well as the contrast between and turbochargers. Since there are no readily-available turbo solutions for the FJ I’ll focus this on superchargers for the moment. The information below is based purely on my own so please don’t consider me an in the field. The following data is a synopsis of what I picked up I was researching and comparing the two styles in to determine which one would fit my personal requirements.

Our first is the Roots-style supercharger, which has around since the mid-1800′s, according to sources, it wasn’t for use in engines until much These superchargers are known to be less efficient than the modern centrifugal models, but are much simpler in their and operation. If my research is correct, also deliver better torque more quickly the centrifugal units, which much greater lag time building boost – similar to a The longevity and simplicity of the Roots-style allows them to be produced at a lower price point the Rotrex models which them a more popular for those consumers who are trying to their modding funds.

The to the Roots-style comes in the form of a supercharger, more specifically the design. The primary advantage to the unit comes in the form of  called “adiabatic efficiency”, a used to describe an air compressor’s to compress air without increasing temperature.  As with any engine, air temps allow for greater and increased volume. This the engine to ingest more air increasing the fuel intake as which will ultimately more power. The Roots-style average about a 40-50 adiabatic efficiency rating the typical centrifugal units in around 60-65 percent. The design, however, claims higher numbers, stating able to achieve adiabatic levels of 80 percent or more. The design of the Rotrex units give them the added of reduced noise levels the Roots-style units which a very audible “whine” at RPMs. For many enthusiasts, last aspect would be considered a disadvantage since gear heads prefer to audible proof of the power But the lack of noise in no way translates to output. The top end Rotrex superchargers can much greater performance than the Roots-style units ever hope to reach. So for looking for the ultimate power a Rotrex supercharger should be the winner.

All in all, both designs strong points and weak In this case, we are looking specifically at the TRD vs URD units available for the FJ The above comparisons still but there are a few other manufacturer-specific to consider to make this a bit more equitable. Baseline for the URD model is going to push the range, and that’s just for the parts. You will either the expertise to install it yourself, or looking at another $1000 or in installation costs. In addition, the output of the URD unit will additional upgrades to other such as brakes, transmission, or more. The URD brings a lot of power to the but there’s a price to pay for adding much horsepower and torque to a vehicle like the FJ Cruiser. The TRD on the other hand, comes in at a lower price point, around $3800 for a complete kit. Installation costs be roughly the same, but no additional are required to other components. The TRD is quite capable when it to adding power to the FJ. But the power is still well within the and capabilities of the stock components. not only reduces costs additional upgrades are not required), but Toyota to offer full warranty coverage for all TRD superchargers by a certified Toyota technician. although hardly a deal as it’s simply my own personal the aesthetic design of the TRD model is more impressive and stylistically than that of the URD model.

In the end, for my particular needs, I for the TRD, Roots-style supercharger, for all the mentioned above – price, low-end torque and cosmetic All were factors when which one worked better for my I’ve never driven a FJ so I really can’t compare it to the performance. But I can say that for a vehicle weights almost 5000 the TRD supercharger was well worth the price. It’s not going to at the track any time soon, but it a significant amount of boost to a whose performance had slowly waning over three of ownership. The more equipment on or carried within translated to performance – a reduction that was more and more apparent time. This is one of my favorite and if I had to do it all over again, I wouldn’t to invest in a supercharger solution. And the URD units are nice, I believe I’d the TRD again as well. It just to be the better option and the best compromise for my purposes.


Since I was adding forced to the list of performance mods, I I might help things a bit by replacing the stock air box with a cold air intake (CAI). the stock air box is technically qualified as a the flow is somewhat restricted to some of the aftermarket solutions. are multiple options available for intakes but based on popular as well as aesthetics, I selected the TRD This intake comes all the parts required for installation, an oil-based, high-flow filter. followed the research and statistics of filters over the years, I to tell you, I’m not a big fan. simply too much variance in air during usage, resulting in too much restriction or not enough Luckily, AFE offers a composite, filter in the same size. The S, is comprised of a composite media and not require any oiling whatsoever. filters are even washable, them to be re-used just an oiled filter.

To save on costs, I decided to order the TRD CAI kit and out the stock air box myself. All parts and instructions are included, making one of the quickest and easiest modifications to I had the old box out and the new CAI installed in less than 30 Instead of using the oiled provided, I installed the Pro-Dry S in its place. Once installed I to test everything out. At there was very little in sound. However under or wide open throttle there was a noticeable improvement, a nice throaty growl the exhaust.

It should be noted that dealerships do not support the use of a TRD CAI in tandem the TRD supercharger and have actually to perform the supercharger installation if one is This is strictly for legal EPA) reasons since been proven again and that both these work perfectly fine If you are looking to add a dealer-installed TRD supercharger and local dealer is hesitant due to the of a CAI, I would suggest a different dealer. Another is to re-install your original air box wait until after the is installed, and then re-install the

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If you’re looking for a great on a TRD supercharger, I recommend ordering the through TRDParts4U.com. You can pick up TRD supercharger components. your TRD air intake. and your FJ Cruiser fit kit all at once. They often well below the MSRP means their prices are quite a bit lower than you’ll find through local dealer. Since I have the expertise for this of installation and I wanted the parts and covered under factory I opted to have my local dealer perform the install. the parts arrived, I simply an appointment to have the work It was an all day job and I believe they charged me for 8-9 of labor with an out-the-door of around $900, but labor will most likely depending on the individual dealer.

To give you an idea as to the performance I’ve listed the before and statistics below. The numbers “at crank” are based on Toyota’s specs. The other set of numbers is on the more realistic “rear performance. These numbers obtained by running the FJ on a dynamometer or as it’s known in the industry. the two sets of numbers, there was an increase of 79 horsepower and 69 foot of torque. Based on the advertised at crank, it would appear Toyota is hedging on the low side of the A more realistic assessment around 318 horsepower and 347 foot of torque at the crank. But even the advertised numbers, it’s not too shabby.

Stock Specs (as @ crank):

239 hp

278 ft-lbs torque

Specs (as dyno’d @ rear

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