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I have both on my 87 900T
Posted by JohnB (more from JohnB) on Wed, 2 May 2001 08:06:13
In Reply to: Turbo Bypass Valve & Horns - Some ??'s, Gavin Gray, Wed, 2 May 2001 07:15:05
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The bosch 9K turbo bypass is a direct bolt in for the OEM valve...look downstream from the turbo for a similar part, looks identical to the higher performance part. All you need is a screwdriver or nutdriver to loosen the clamps on the existing bypass valve although you may have to move other stuff or hoses out of the way to get to it.
The Hella horns (the big red ones?) are essentially a bolt-in. YOu can see one horn near the w/s washer reservoir...the other one is deep down underneath the headlight assembly but next to the radiator. The top one has to be removed to get to the bottom one, if not the battery. I think I removed the battery to install the lower one. Additionally, you need to fabricate/install grounding wires since the OEM horns are grounded to the mounting studs and the Hella horns have ground terminals. You'll need maybe two 6" lengths #12 wire and female terminal ends to mate with the male/spade ends on the horns and perhaps some ring terminals for the other ends of the two jumpers. I grounded the horn ground terminal to the mounting stud for convenience. You may have to bend an OEM horn mounting strap to get clearance for the larger Hella horns.
They sound better for sure than worn out OEM horns, but after several years (and associated corrosion problems with the horn terminals, easily fixed but irritating) I almost wish I had replaced the OEM horns...they didn't act up on the terminal issue for 10 years and 150K miles.....
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