Perrin Transmission Support & Whiteline Gearbox Positive Shift Kit
 

So,
Perrin Transmission Support [PSPDRV160]
http://www.perrinperformance.com/brz...mission-stiffy

Whiteline Gearbox Positive Shift Kit Bushing [KDT926]
http://www.whiteline.com.au/product_..._number=KDT926


1) Which is better?
2) Which would you do first?
3) Are they compatible? (would you do them both?)
4) Do they do the same thing in a different way?

cheers,
Jehu

i think both companies are lazy and i'm waiting for one that would just make a caged unit like the beatrush stuff for the subarus

Disclaimer, these are my opinions
1) I haven't tried the Perrin (yet), but I do have the Whiteline. Looking at the design and imagining how they work, I think the Whiteline is better if you must choose between the two
2) Whiteline for sure. The Perrin alone appears* to replace the silver piece in the picture, which fills in the lateral space between the pointed parts of the Rear No.1 Engine Mounting Insulator. If the Whiteline (yellow) wasn't there, then to me, the Perrin looks reduces rotational flexing. The insulator itself is fairly soft materials so the Whiteline here reduces that rotational flexing and vertical compression by filling in all that empty space. Both do their part to add mass to dampen vibrations which I believe is their primary intent. The Perrin being made of aluminium may add more mass than the urethane in the Whiteline.
3) I think they are mechanically compatible. I will know by the end of the weekend as the part is coming in. Would I do them both? won't know until it happens
4) Yes.



Stock Rear No 1 Engine Mounting Insulator. Whiteline fills in gap. Perrin replaces the metal piece and shank. The inward angle vertical walls are soft rubber
http://farm9.staticflickr.com/8327/8...17480f5c_c.jpg
20121012-WhitelinePositiveShiftKit_DIY-01 by VictorN07, on Flickr

http://farm9.staticflickr.com/8044/8...d7319fa0_c.jpg
20121012-WhitelinePositiveShiftKit_DIY16 by VictorN07, on Flickr

Looks like they will work together. That would be a great combination if so. Bump for someone that knows more than me to confirm.

Rather than get these two together, I'd get the Whiteline Positive Shift Kit (which I actually do have currently on my car) and get the Perrin Rear Shifter Bushing along with it: http://www.perrinperformance.com/p/2175

I think those two together would give you a better benefit than these two things which appear to do the same thing (if they can even work together at all, that is).

perrin mentioned there is a possibility the urethane will squeak after a while. is that true? i know they make urethane parts so they could've made this part urethane as well but chose not to. could that be the reason?

That's spot on. Any bushings, bearings, and inserts will squeak over time. This is why it is important to apply grease to the surface when installing them, and periodically checking and regreasing as required. Mind y'all that we are talking about a few years, not every few months. If the Perrin doesn't require greasing, then for the set and forget it lot, that would be the better option.

could they be used together for improved stability? or would it make it too stiff to be comfortable

I went the route Foobar described above. I'm installing this weekend and I'll add my review here.

Agree both of those is a very good route. Sharpens things up a bit in the gearbox but I just found there is still room for improvement.

btw i wouldn't do this mod without engine mounts

you need to stiffen both, otherwise you're creating a hard point at the transmission while the engine remains soft, causing stress all over the place.

Yup. I was going to get the perrin engine mounts as well and put them all in at once. Laying the foundation for some more power once the warranty expires. :thumbup:

Thanks for all your answers.

Wootwoot, I didn't think Perrin had released engine mounts yet for the FA20?

Cusco kinda went the middle route on theirs, didn't they? Big washer to stiffen the void.... Sleeve and metal bracket to stiffen that silver bolt/plate.