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08-14-2020, 03:03 AM | #16 |
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Okay. I'm doing the whole rear end. Subframe, diff and suspension. Might cure the axle tramp that's costing me precious tenths.
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08-14-2020, 07:28 AM | #17 |
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08-14-2020, 08:02 AM | #18 |
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I wouldn't make it a priority and they definitely won't work miracles (unless your existing bushes are in sub standard condition).
In terms of road use, modern suspension is designed to factor in controlled bush movements. Companies that sell "stiffer" bushes are simply trying to sell lots of stiffer bushes...so a video actually showing a modern suspension system working quite well is then interpreted as wobbling around all over the place... |
08-14-2020, 08:39 AM | #19 |
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Standard bushes are soft as the ones of a city car, a sport car needs stiffer bushes. I fitted all the TRD ones and now I can say response is what you expect from a sport car.
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08-14-2020, 09:20 AM | #20 |
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So I have done the subframe inserts and can vouch for them. I am hesitant to do more because I can tell you first hand about my experience with 04 WRX. I know it’s a different platform but you might learn something.
I added every harder bushing (group n rubber or poly) and the wagon handled so much better, turned on rails, really liked it. Also added some braces, ft and rear strut tower, fender cowls, fr crossmember. I liked it because it’s a rally car right? Well any female and many normal people who drove with me thought the car was cool but harsh. On smooth roads it was fine, but on rough roads it was so obvious. It also made a huge difference depending on tires. Summers with hard sidewalls made it worse , although it handled even better. Snows with soft sidewall felt like a vacation from the harshness and is what really opened my eyes about the NVH. The biggest culprits were the fr control arm poly bushing - causes you to feel every perpendicular crack in the road, railroad crossings are hell. Also the outrigger bushings with the diff bushings caused an off throttle whine from the rear diff. This can be annoying and other times not so much. But it’s there because people have asked me what it is. I have 142k on her and she has been like this since about 70k, so I survived but I can tell you when I get out of the car and then drive my wife’s IS300 it becomes so obvious how much harsher it is. And I am someone who likes raw harsh cars. So if you are more sensitive to these things, think it through and perhaps try to get a ride in someone’s car with the mods you want. I would add one more thing. The Impreza platform needs more help than the twins. |
08-14-2020, 09:35 AM | #21 |
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I had subframe inserts first, then added Diff bushing inserts.
I ended up taking the subframe inserts out because the increased harshness was too much for a DD. The diff inserts I kept cause they do a good job minimizing driveline lash and axle tramp (wheel hop). And they don’t contribute much NVH at all. |
08-14-2020, 11:11 AM | #22 | |
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IMO poly can sometimes be the culprit, or at least poly in the wrong place. Even spherical bearings are a better choice in some locations. Not all poly is bad though. STI Group N rubber is almost always a good "sport" option. In addition to that, firmer bushings will highlight deficiencies in your dampers. It's asking more from your shocks to deal with so if they're really good shocks...you're going to do okay. If your shocks aren't quite as advanced...OR you can't make a few necessary adjustments...you'll feel their shortcomings a little more. One way to put it...take a set of crappy coilovers with bad valving and not enough travel. Switch between OEM rubber top mounts and camber plates and the difference in ride is big. With a very good coilover, switching between rubber top mounts and camber plates is a smaller difference in ride. With the diff and subframe inserts, there is a slight increase in gear whine and a slight "thunk" when engaging a lower gear. This decreases with time in my experience. For me it's not bad overall. - Andrew |
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08-14-2020, 12:37 PM | #23 | |
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08-14-2020, 01:03 PM | #24 | |
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08-16-2020, 11:41 PM | #25 |
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I have read a few discussions on axle hope on here and not seen much in the way of definite results. Have you looked into the MCA traction mod?
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08-17-2020, 04:29 AM | #26 | |
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08-18-2020, 12:05 PM | #27 |
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I installed just last year.. I suppose my OE ones were getting worn. The throttle feels more direct. Less slop in the driveline, more responsive to throttle. Less delay from me stepping on the throttle and the torque from the crank reaching the tires..
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08-25-2020, 02:53 PM | #28 | |
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Yes, You can feel it from the drive train slop. It's pretty obvious once you feel the difference when the drift shaft is under load. do you have any body brace? thicker axle & a chassis brace like this will also help with wheel hop/body torsion. *not my car. Last edited by chaoskaze; 08-25-2020 at 03:04 PM. |
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