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Review Z1 subframe bushing and diff bushing plus whiteline comparison

Old 02-28-2019, 07:05 AM
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4doorfury
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Z1 subframe bushing and diff bushing plus whiteline comparison

About 2 weeks ago I installed the Z1 subframe bushings. These were not terribly difficult to install however Z1 instructions are not very good. Just as a reference point, they show 1 insert going into the bottom of both rear bushings and 1 in the top of the passenger front, mind you the kit ships with a total of 6 inserts...what do you do with the others??? Well after looking at it a realized that the 2 front bushings get an insert on the top and the two rear bushings get an insert on the top and bottom. Some advice, the subframe is fairly easy to drop, an impact gun would be useful here to lower it, start with the front bushings as Z1 suggests. I did the rear first and it caused me to have to drop the rear again to do the front due to less leverage once the rear bushing inserts were installed. You also will benefit from some type of bushing friendly lubricant to ease install. Get yourself a rather heavy rubber mallet too.

So these were a pretty decent upgrade. They helped some with wheel hop and I didn't notice any change in nvh at all. This was with the stock diff bushings still. I can still cause wheel hop at this time however it was slightly improved. I'd say I'm a happy buyer and would suggest these to anyone with the extra cash. Diff bushing would be my first mod however over these.
these.

Diff bushing review will come in next post...
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Old 02-28-2019, 07:05 AM
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4doorfury
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The subframe bushings from Z1 were much easier to install in comparison to the whiteline. With whiteline you have to press the bushing in. With Z1, a little grease and a few whacks from my hammer knocked it right in place. I won't be going over the entire install process as that's been beaten to death already.

Impressions, good fitment, easier install than whiteline, still next to no added nvh.

Overall impressions...

​​​​​​Very good combo for the money. My car is a 7AT and the shifts feel much more solid. Wheel hop can still be an issue if I push her hard. I had whiteline bushings in my previous car by themselves and I'd say the Z1 setup with inserts is superior. Just wish Z1 would improve on their install directions for the inserts (collars).

Last edited by 4doorfury; 02-28-2019 at 08:34 AM.
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Old 02-28-2019, 03:16 PM
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Word has it that a diff brace quells wheel hop.
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Old 02-28-2019, 03:27 PM
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4doorfury
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Been looking at them but wanted to hold off until I had these mods done and got some seat/track time
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