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02-16-2023, 04:20 PM | #1 |
Bilstein B6 + TRD Rally springs + Pedders top mounts
People keep asking for my thoughts on these so I'll start a thread.
I've had these on since early December, kind of as an experiment and as something to hold me over for the winter. Bilstein B6 notes Super solid, feel good, not cushy but confidence inspiring and controlled. Pedders top mounts notes Also good stuff, have run these briefly in the past, no issues. TRD Rally springs +10mm height 259 lbs/in front (4.6 kg/mm) 294 lbs/in rear (5.25 kg/mm) Those rates are no joke! These are stiffer than you'd expect for a "rally" set up but I think the idea is to make the most of the limited amount of travel of an OEM style fixed perch strut. Height Seems like +10mm to me. Subtle but kinda cool. Road handling: Unfortunately I've only been on my winter tires with this set up so far, which are 195/65/15 size on 15x6.5 wheels. It's a lot of fun and the car certainly seems more "active" but obviously there's not a lot of grip. It does require a little attention with these tires...you're not divebombing highway on-ramp apexes the same way...you still can but with a little more finesse. I will put my summer Michelin Pilot Sport 4s on the car at some point soon. Winter's over man. Dirt/snow handling: Nothing yet really. This winter sucks! I'm planning on an April rallyx event and I think it will do well. Ride: It's firm. The little bit of extra ride height helps but they're still stiff springs. Overall it's less comfortable than the OEM 2022 BRZ suspension I was running right before this set up. I think combined with the long OEM bumpstops in rear and Bilstein internal bumpstops in front it's just too much overall rate (remember the bumpstop spring rate is in parallel to the main springs, so you add them together). Even with the slight lift you're still not that far from the bumpstops. There are 2 things I want to try with this set up before moving on and I'll update the thread when I do. First is the MCA traction mod, and the next is different (shorter) bumpstops. My car is very dirty and I'm not good at taking pictures. - Andrew |
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02-16-2023, 04:20 PM | #2 |
update in post #19
Last edited by Racecomp Engineering; 03-28-2023 at 08:25 AM. |
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02-16-2023, 04:31 PM | #3 |
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How about lowering gas pressure a little?
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02-16-2023, 04:37 PM | #4 |
That would proably improve the ride but there are enough advantages to the gas pressure that I don't want to do that.
The ride isn't "bad" but just isn't as good as it could or should be. I think the new bumpstops will make a nice difference. Also, the roads I drive on are truly awful. - Andrew Last edited by Racecomp Engineering; 02-16-2023 at 05:48 PM. |
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02-16-2023, 05:27 PM | #5 |
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Thanks. This is really interesting. What about softer, longer springs preloaded to get your desired ride height?
On the Pedders hat front have you experimented with caster adjustment? I’m familiar with rake and trail changes from my MC days but my thought experiments on cars have flopped. My guess is that increasing caster would slow turn and increase straight line stability, but I haven’t seen anything testing that hypothesis. Thanks again.
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02-16-2023, 05:44 PM | #6 | |
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02-16-2023, 06:28 PM | #7 |
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Wow those spring rates are anything but rally.
I've been contemplating having a set of B6 dampers re-valved for a more true rally setup on stock springs, but wanting to try out more travel in the rear. This would be more of a "recce car" setup and not a full fledged competition spec. |
02-16-2023, 09:29 PM | #8 | |
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02-16-2023, 10:00 PM | #9 |
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Andrew,
The MCA traction mod is good. 10/10 would buy again. Rear end takes a nice set and provides what I perceive to be additional grip both on and off throttle. I'd be curious to hear what you think with your suspension setup and knowledge. B
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02-17-2023, 09:22 AM | #10 | |
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- Andrew |
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02-17-2023, 09:23 AM | #11 | |
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- Andrew |
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02-17-2023, 09:32 AM | #12 | |
Agreed!
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Either way, good information gathering exercise! And I do think the springs will be great on back roads and stuff, just maybe not the best for rougher roads. I do think different bumpstops will help though. - Andrew Last edited by Racecomp Engineering; 02-17-2023 at 03:31 PM. |
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02-17-2023, 04:52 PM | #13 | |
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I'm also glad about the rear overload you have planned as i tend to occasionally tow a trailer. I might pick up the traction mod in the future too. I'm about to have my shop install my lift kit next week with bilstein b6, 1" spacers and the Chuhatsu springs. Is an alignemnt required after installing the mca traction mod, or does it bolt up in a way that nothing changes?
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Last edited by Spawn_Of_Creation; 02-17-2023 at 11:00 PM. |
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02-20-2023, 12:54 AM | #14 | ||
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I am watching this with interest. Your goals are different to mine but I currently have the TRD Rallye springs with stock '13 shocks and the MCA traction mod. I have been wondering if the B6 shocks would be a good match as I am looking for more of a rough tarmac setup with occasional gravel. With my setup I found it a bit too tail happy. I have removed the rear sway bar for now which has fixed that but in future i'll look at a softer than stock Cusco or Mann Engineering as a better solution than none at all.
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They claim no alignment needed but i found it affected my toe a little so probably worth the alignment anyway.
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