Front UpRights

I came across this thread and I really like this product and it think it better fits on the Track related section:
\https://www.m3post.com/forums/showthread.php?t=1749912

Long story short these are front knuckle upright for more track/race corrected alignments:
here are some highlights from that thread:

*corrects bump steer,
*roll center for track ride height setups
*address camber loss through cornering

Info from StromMotorsports
"The benefits of our uprights vs the SPL parts by themselves:
1) 30mm of ride height correction vs 6.5mm (again from what I can tell - please correct me if I am wrong).
2) Move the strut inboard 5mm to fit a bigger wheel without that pesky 5mm spacer.
3) Correct the position of the thrust arm. We were finding that as the car got lowered too far (20+mm) it was getting excessive anti-dive and shocking the front tires under hard braking. This is especially true on softly sprung cars.
4) These are cnc machined out of forged billet blanks and are extremely strong. The lower outer bolt on the SPL arms takes a lot of load by spacing it out. SPL makes fantastic parts so I am thinking that may be one of the reasons they didn't provide more roll center correction is to keep the loads on that bolt within reason.

These are meant to bolt up perfectly to the bearings, strut, wheel speed sensor etc. of an E9X M3 or 1M with no other modification so will work with any part meant for those cars.

Lastly these are not recommended for cars that are not lowered by at least an inch (25mm).

Base on the info I came I cross I decided to buy one."

https://live.staticflickr.com/65535/50349674911_0f900719f3_h.jpg

I have all stock arms, this sounds very interesting

I have a set on order. I'll update once they come in.

evilspiritM3 wrote

I have a set on order. I'll update once they come in.

awesome I hope we can get our sets soon, but the soonest is about 8 weeks.

I'm eager to hear the results from you guys that bought these. Interested, but want to see 3rd party tests (forum members) before getting them myself.

tsk94 wrote

I'm eager to hear the results from you guys that bought these. Interested, but want to see 3rd party tests (forum members) before getting them myself.

Yeah I'll be sure to update. I got some consistent lab times at Buttonwillow raceway. Will see what i can do and how it feels.

I also want a set, just because I like what I see and they've clearly done some homework and know proper setup for this chassis.

I currently have all the SPL arms on my car now and generally no real complaints about the way the car handles but I am low enough these would likely be even more optimal.

//steve\\ wrote

I also want a set, just because I like what I see and they've clearly done some homework and know proper setup for this chassis.

I currently have all the SPL arms on my car now and generally no real complaints about the way the car handles but I am low enough these would likely be even more optimal.

Yeah I dont have SPL arms and was considering going all SPL, but this would provide everything I would get with SPL, plus some more. Also this corrects the camber loss during corners, and a Stiffer upright is also a benefit.

Spoke with Brett from Strommotorsport and he said comes in black anodize but they can over other color with a price or bare aluminum.

Recently this was posted on the other thread from Strommotorsports:


So we did a back to back test of the uprights on a 1M race car at the NASA event at Utah Motorsports Campus this past weekend and had great results! Struggled a little bit with getting the same conditions for true back to back testing but still the car was faster under all conditions. We ran Hankook F200 C52 slicks with a target of 30 Psi on the UMC West Course.

As expected the car was overall quicker (by about a second), easier to drive, had better braking with less ABS intervention and achieved much better tire wear. In particular we noticed the car was much quicker in lower grip (hotter ambient) conditions.

Main result in the most similar ambient conditions was 1.6 seconds faster:
1:35.156 at 57F ambient on 6 heat cycle slicks with new parts vs 1:36.766 at 63 ambient on 2nd heat cycle slicks.

Full Data:

Friday Without Uprights
Ran test sessions on Friday and were able to get good laps with minimal traffic and low ambient temps.

Session 1- 1:38.71
Throw away session with junk tires that had run the whole previous weekend.

Session 2 - 1:35.31
Sticker Hankooks - 55 ambient with sun just hitting the track. Perfect session.

Session 3 - 1:36.76
2nd Heat Cycle Hankooks - 63 ambient

Client ran the car for the rest of the day.

Saturday With Uprights
We changed the uprights that night, took out 0.2 front camber and reset the toe.

Session 1 - 1:35.156
6th Heat Cycle Hankooks - 57 ambient. Took 8 laps to get through traffic and achieve this time. Was super impressed by how quick the car was on pretty used tires. Needs more rear grip. To take full advantage of the uprights on this car we found we really needed more rear camber but this car had stock rear upper arms and we were maxed out. Increase in front grip was substantial.

Session 2: - 1:36.511
7th Heat Cycle Hankooks - 64 Ambient. Tire shop could not get our new slicks mounted in time. Gave up after a few laps due to traffic. This was supposed to be the sticker run to try and get as close as possible to the conditions of the Friday sticker tire run. For those who haven't run slicks the very first heat cycle is worth 0.3-0.8 seconds.

Session 3: - 1:34.927
Sticker Hankooks - 73 Ambient. Fastest lap of the weekend but disappointing. The track and ambient temp came up very quickly and we way overshot on tire pressures. I came in at 34 Psi on the right front. Previous session had also dumped coolant on the track from turn 6 to 9 so made it

Session 4: 1:35.982
2nd Heat Cycle Hankooks - 83 ambient. Achieved in a 30 minute sprint race on lap 6. To me this was really where the new parts showed how good they are. Again I needed more rear camber to balance how well the front was sticking but to run 0.8 seconds faster on the same number of heat cycles in 20 degree ambient higher temp was fantastic. Unfortunately forgot to download the data after this session as I was still supporting a client and we were in a hurry to catch flights but lap times are on racehero.

Will post the Motec log files to the website tonight at strommotorsports.com/uprights

tlrid3r wrote

Yeah I dont have SPL arms and was considering going all SPL, but this would provide everything I would get with SPL, plus some more. Also this corrects the camber loss during corners, and a Stiffer upright is also a benefit.

Spoke with Brett from Strommotorsport and he said comes in black anodize but they can over other color with a price or bare aluminum.

I've considered ditching the SPL arms and going back to stock w/GAS monoballs) + uprights as I think in the end it's the better of the two options. The uprights are an expensive piece that I quite honestly don't think I actually need but if I can offset say 1/2 the cost it's not so bad.

damn that is a good improvement...I might just do monoballs and save my pennies

Latest update, Machining got delayed with machine shop about 12 weeks. they are looking at delivery at Mid Dec. Sad to hear but hoping no further delays occur.

unclear to me how anti-dive is changed without moving the inner arm mounting points but useful parts regardless!

Would it be possible to machine the caliper mounts to accept F80x calipers/rotors?

Edit: or even better, can both sets of mounting holes be accommodated? Unclear from photos if they're in the same plane & the only difference is distance between bolt holes:



from https://www.m3post.com/forums/showpost.php?p=23822560&postcount=141

I went ahead and pulled the trigger on this too. I expect to be able to run at least one event without the aero I plan on putting on the car, so I'll have some good data - maybe not apples-to-apples because running different tire compounds.

redpriest wrote

I went ahead and pulled the trigger on this too. I expect to be able to run at least one event without the aero I plan on putting on the car, so I'll have some good data - maybe not apples-to-apples because running different tire compounds.

I'll be able to run my car on identical spec from before and after the upright. Should be interesting.

tlrid3r wrote

I'll be able to run my car on identical spec from before and after the upright. Should be interesting.

Look forward to hearing your results.

Whenever I get around to it mine will go on as the only change I make to the car so I should be able to see some back to back. My car has full SPL arms on it now so will be curious to see difference. I'll likely also do new front hubs from Core4 with pressed in studs while at it to make the swap that much easier.