I decided to make this guide as I didn’t have a lot of this information available to me when I bought my aftermarket front upper control arms (FUCA). It would have been nice to have at the time, so I’m hoping this will help some of you make a more informed decision. I have been told the 2GS spindle is the exact same, but someone else said they are very similar but not identical (I believe it was EK). So, this may also help some GS guys.
Im sure you are aware of the front suspension issues created when you lower your IS300/200/altezza; The top of the FUCA hits the inner fender well, shortening the life of the FUCA on the car. You have two options to fix this problem:
-cut a hole in your engine bay (if you want to do that, fine, but we will not be discussing that here)
-shorten your spindles and get adjustable FUCAs
Once you have shortened spindles, it is highly recommended that you buy adjustable FUCAs to make the most out of your spindles. I like to call these modification supplemental modifications, meaning the two go hand in hand and compliment each other.
If you have a review of a FUCA, please post it up (with pictures), the more info the better. I will edit my original post that includes a hyper link of your review.
Here are all the readily available options you have for FUCAs for the 1IS (in no particular order):
(with or without super pro offset bushings); pretty self expandatory. Fig’s site claims these can get you +/- 1.5 degrees of camber per side. A great option for someone looking to refine their current setup and not want to spend coin on an adjustable arm. If you have shortened spindles or plan to get some, I recommend you buy an adjustable arm.
(with or without super pro offset bushings); Serial9 just started carrying these and they claim they are 25mm shorter than stock. These have been popular with the stance crowd looking to get more camber out of their car while not shelling out a bunch of coin for adjustable FUCAs. I know someone on IG who has these with offset bushings and he told me that he can get an ‘easy -8/-9’ degrees of camber with these arms.
; These are a sliding balljoint adjustable type. Identical design to the megans. These allow +15mm/-15mm of adjustability. My detailed review is below this guide. I do not recommend these for super low cars as the end of the sliding portion metal comes in contact with the inner fender well. These would be a great option for someone who is at stock level height or near stock level height who wants to be able to adjust their FUCA in small increments.
; I have no info regarding the measurements of this arm. But, I believe that the jzx FUCAs in general are around 20-25mm shorter than IS300/altezzas based off the info Serial9 provides for the OEM jzx100 FUCA and the cusco part numbers below. While these are shorter, I imagine these will still fall into the same issue as what I am experiencing with my KFD arms above.
; The cusco arms are similar in design to the sliding balljoint, but these have pre-set adjustments the ball joint locks into. Making it impossible for the balljoint to move/slip (unless the hardware falls out). The 4 preset locations for adjustment are: +4mm, -4mm, -8mm, -12mm. While the cusco arm has 3mm less of adjustment at max neg camber than the KFD, there looks like there is a little less metal hanging out on the end of the FUCA to catch on the inner fender well. Im not sure if the bushings are rubber, pillowball, or poly.
; Same adjustments as above, but I am guessing the arm itself is 20-25mm shorter. If anyone has any concrete info, please let me know and I will add in. For reference, the part numbers between the jzx100 and is300 are ‘175 474 K’ and ‘195 474 K’; 195-175 = 20(mm). I would recommend this arm for someone who is looking to get more camber for a VIP style build. It has the same pre-set adjustments as mentioned above, its just a shorter overall arm.
; according to their website, these arms will give you between -4 and -8 degrees of camber (-20mm to -40mm), 10mm shorter overall height, cromo rod ends, in-situ adjustment, balljoint is corrected at -3.5” and clearance for airbags. Like the cusco jzx100 arm, its probably more vip oriented. IMO, for super low cars and VIP style builds, this is the way to go; the bee’s knees.
; S9’s states that these are adjustable from +5 to -15mm. they are also 10mm shorter overall height, cromo rod ends, in-situ adjustment, and the balljoint is corrected at -2”. These look like they would be awesome for minor suspension corrections and track duties.
; there is not a lot of info on their site (link below in post #13
), other than they have two versions: 'oni can' which is -50 - (-5)mm shorter than stock, as well as 'semi can' which is -35mm - (+10)mm length from stock. They dont state it on their website, but it looks like the overall height is shorter, allowing for more clearance. T demands stuff is VIP oriented, so not for your track or everyday IS. Their stuff is also very pricey.
; they have a couple of options: drag/drift, road, and VIP. The first two look like you can get a range of -4.5 to 1.5 degrees of camber and even more with the super pro offset bushings. Spherical rod ends are also an option. The VIP is not listed on the website, but I have seen it on someone’s car, I was told they can get up to -13ish with out the spindle hitting the coil. I believe these are made to order. Fig’s website has A LOT of info regarding these arms and why they are designed they way they are. I recommend you check their site out if youre considering these. These are probably the most track-oriented FUCAs out there.
; these are a steel construction so they are going to be heavy. They use a sliding balljoint design, but its different than the KFD/megan type. They appear to to be solid/heim mount. Not a whole lot of info out there on them, but from what I can find, they allow for +10mm to -10mm of adjustment. Probably the most expensive option on the list here. Here is a thread from 2009, all of the image links are dead: https://my.is/forums/f89/ikeya-formu...r-arms-399400/
; I called megan last week and I was told their arms allow up to +/- 3 degrees of camber. Sliding design similar to KFD. I am not sure that the bushing material is, but it looks like the ‘hardened rubber’ they use on other arms. See the issues with the KFD arm above, you will run into the same issues with this arm.
; same sliding design as KFD and megan except god speed is known for being cheap. Do not buy these, you will regret it.
(If I've forgotten any please let me know and I'll update the list; this list will also be updated as more info becomes available.)
10/31/18: added t demand.