What aftermarket turbo are you running on your RB20DET
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They do. The pale yellow translucent ones from Japan were .... I dunno. Useless? Whiteline and SuperPro are probably fairly similar. There's bound to be a range of different hardnesses amongst the dozens of options on the market. The simple fact is that the pineapples don't get up inside the bush at all. They just sort of exist in the space between the washer/bracket and the subframe's bush outer tube, and...exert a bit of force between them? Or something like that. I'm sure that with enough provocation, they will simply allow one to more wrt the other. -
I'm not sure they came in different hardnesses? Going from memory only - I had set them up in the balanced setup. I also have poly bushes, so I have both poly bushes and pineapples. This is what my memory tells me at least. I'll have to take a look under there to be sure. The tramp was so bad that I managed to eject/kill a diff bushing, so those I know are stock. The tramp is bad enough that you are 200% sure you are doing severe damage to the car. It's not just chirping or vibration, it feels like you're hitting a speed hump/kerb 10 times a second. The issue has persisted between subframes! (I went from Hicas to non hicas subframe and replaced every bush a few years ago now) so I'm entirely lost. Every arm is factory. -
Can recommend the Frenchys kit, been using it 2 years now with no issue, very happy with it. Only thing for me was upgrading the thermo fan but I am super fussy on cooling. Also interested in electric AC, partly for boot mount to have a clean bay and partly would love the idea of cooling off the car before i get in. The battery setup to do that might be tricky / expensive though. Found this an interesting watch. -
I put Whiteline pineapples in my old 33, they came in a 6 pack of them, got rid of the axle tramp altogether, cheap, quick and easy install, they were pretty solid units though...???high durometer???? and NVH was increased a fair bit How hard are the ones you installed? -
I'd suggest the answer to the first question is at least a qualified "yes". I'll come back to that. Pineapples just don't do a lot to solidify the mounting of the subframe. They do a little bit, and that little bit was clearly helpful to me in the past, but the main thing they are intended to be used for is to tip the orientation of the subframe to try to either dial in more or less anti-squat. You can install them one way to try to increase launch traction, or the other way to try to increase lateral grip (at the notional expense of longitudinal traction). Or, as I did, you install them neutral, which only really offers a little bit of "snugging" up of the subframe. When I did pineapples, that was the only option. No-one had a machined alloy collar like the GKTech ones. There were some other options, but nothing like the slip in collars. And it is clear from looking at them that they occupy almost all the free space inside the rubber bush, so they will do a lot to stop them moving internally. So I thought, "that's the game for me!". Obviously the next/adjacent step is poly bushes, but what's the point in doing that with all the work and hassle required to change them over, when jamming (and I mean literally jamming) some alloy into the rubber bushes probably gives an equivalent, or possibly even superior result? So, to go back to your 1st question, I would suggest, for the investment of <<$100 and a morning spent lying under the car swearing and getting some sore fingers, it is certainly something you should try. Who knows? Maybe your situation is so severe that it doesn't solve it. But it might help a lot. If your problem is as severe as you say it is, the next thing to look at is what the rest of the bushes in the rear end are made from. Things like the Hardrace arms with hardened rubber bushes might be a good thing (for the purposes of having adjustability AND stiffer bushes). Otherwise, just poly bushes throughout could be a help. Or following in my fever dream footsteps and putting a lot of sphericals into the rear? Eliminate undersired movement to avoid the build up of resonances that cause the tramp. Also, if you have adjustable uppers in the rear, and you haven't put effort into adjusting the traction arms to minimise bump steer, there might be some advantage in that. If you don't want to go to the effort of doing it yourself (like I am pretty much forced to in Adelaide, owing to a lack of race alignment specialists) then surely there's a place in Melbs that is able to do it. It will cost $$, But that's life.
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