The belt slip isnt a huge issue for rallycross, there isn't much shifting, and it only appears to happen during hard upshifts. If I can't get the factory A/C tensioner to work, then I may just design and machine a tensioner system to fit off the block. It's also extremely difficult to get it tight with the current tensioner bolt being fixed to the pulley bolt.įor the belt tensioner, it looks like Track Dog Racing and others offer upgraded belt tensioner systems but they are a bit pricey for this project and require the power steering pump in place for the bracket (or an additional bracket). I didn't notice a large amount of belt dust, though I don't have a tension gauge to properly set tension so who knows how close it is. I also have another project car it can be used on, so it will eventually come out.
It was more for fun than anything else, but yes was to help diagnose the lack of boost. A set of stock springs from a 1996-97 and no lift kit may be a better option. Maybe the goal is a higher spring rate, but I suspect those blue springs are fairly soft for their ride height and you may have very little actual bump travel.
The combination of a lift kit and lowering springs is funny. The Downing/Atlanta aka Sebring aka Moss aka Jackson Racing supercharger was not strong in the belt tensioner area, but all of my experience is with a PS car. Absolute minimum cost would be no boost gauge at all :) I guess it did help you find a slipping belt, but you can usually spot those from a lack of tension. What's the point of the boost gauge? You can't actually affect the boost with anything other than your right foot, and a SC fails to low boost instead of high. Overall though, just a few things to address before the next scheduled rallycross, a mixed surface event that promises to be a blast! The exhaust, which is a mess of the factory manifold to downpipe, straight pipe where the cat was, and then welded to a stainless cat-back to a "turbo tuff" muffler was ridiculously loud, even for a dedicated rallycross car. In the original mossmotors kit for non-PS w/ AC, they included a newer ribbed pulley, and "t-bolt" which I will need to fabricate.
It looks like these parts are impossible to find now, so I will have to machine the pulley through "t-bolt". So to make tensioner adjustments, you need to push down the pulley and then quickly tighten a lock nut on the tensioner bolt. However, it appears to be a cobbled together fix, where the through-pulley bolt which is supposed to be threaded is totally fixed and welded to the adjustment tensioner bolt.
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This is a manual non-power steering, with A/C, so it uses the factory tensioner. The belt tensioner is in sore need of an upgrade. The throttle cable was routed in a not so good way, binding and causing a sticky feeling pedal. The supercharger kit needs some attention. Right now, the supercharger makes decent boost, but during a gear change (when there is a speed difference in the pulleys) the belt slips momentarily. I may try to pull one lift bracket off, and see how these unknown springs sit. For rallycross, a lift is really not needed, but this will stay for now as the lift brackets look fairly rusted in place. The "lift" is a Paco 3" lift kit, KYB GR2 struts that appear fairly new (not rusty), and some unknown blue springs. Going over the rust bucket in more detail (or as it's now known, the "crusty tuna can") revealed a few things.
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