From: james@pelicanparts.com on behalf of James at Pelican Parts [james@pelicanparts.com] Sent: Wednesday, July 14, 1999 4:01 PM To: Wayne at Pelican Parts Cc: twatson@sirius.com Subject: Re: Hi Tim, My opinion is Big Reds are BIG HYPE. its just a Brembo caliper; no magic. A cheaper solution would be to use 944 turbo calipers (you'll have to get or make custom adapters); I think new they cost less than $200ea at the dealer and I see many sets for sale used for less than $400set. The real question is why do you want bigger brakes? What brakes do you already have? How much does your car weigh? What tracks do you run? How much horsepower do you have? What pads do you run? What kinds of speeds are you seeing? What brake fluid are you using? What size wheels are you running? I race a '79 SC, 2,750 lbs., Pagid orange pads, ATE fluid, stock brakes, and I don't have any problems. I also have a formula ford with brakes that are smaller than a 914 brakes. You see, its all relative, and there are many questions to be answered. One of the things seldom considered when do brake conversions is the increase in unsprung (and overall) weight, which will require revalving the shocks, and the car will potentially handle worse. Examine ALL the trade-offs! ...and in the end: granted, the car may feel more secure to drive, but the reality is it won't stop any faster (how fast you stop is a function of tire friction). If you'd like, with more details I could help you develop a brake system best suited to your needs. Good luck, james > > > -----Original Message----- > > From: twatson@sirius.com [mailto:twatson@sirius.com] > > Sent: Tuesday, July 13, 1999 6:27 PM > > To: pelicanparts@csi.com > > Subject: > > > > > > Dear Sir(s): > > > > I have an older 911 that has been set up for racing that I would > > like to set > > up with the Big Red brake set up. Are there any relatively > > inexpensive ways > > to do this or any suggestions you might have? > > > > Thanks > > > > Tim Watson > > From: James at Pelican Parts [james@pelicanparts.com] Sent: Thursday, July 15, 1999 1:40 AM Cc: WLB434@aol.com Subject: Re: 1978, porsche 928 Hi William, unfortunately I don't have access to any wiring diagrams or any direct experience. But I do know the loci Porsche uses for fuel pumps. Your car is CIS and should share the same basic fuel pump logic as other CIS Porsches. Let me give you a couple things to think about: on a '78 911 there are two different circuits for the fuel pump. One only turns on the pump when the starter circuit is energized, and the other, which is controlled by the "air flow sensor" keeps the pump running (as long as air is passing through the metering system). Now lets talk relays: A relay is basically two independent circuits: a control circuit, and a function circuit. When you jumped the fuel pump relay all you did was to hot-wire (closed the loop) the function circuit. That means the control circuit is not working. This is terminals 85 & 86. But, even if that failed the car should start (then die once the key is released; does it?) from the starter circuit. Exactly how did you jumper the pump anyway? Does the "click" when plugged or unplugged? Do you have voltage to the fuse? Note: this information is based on a 911 diagram which should be similar. Control side: Terminal 85; should go to the air flow sensor (AFS), then ground at the generator. You should have continuity at this terminal when the car is running, but the AFS will prevent it when not running. You might try to ground this terminal or jumper the AFS. Terminal 86; is tied directly to T87, and should have 12v when the ignition is on. If not, trace power to the fuse, then the ignition switch (one of several red wires; ignition switch failures are common on Porsches). Actually, on a 911, if your not getting power between the switch and the fuse, its gets much more complicated; let me know if this is the case. Does your Cd make noise when the ignition is on? Function Side: Terminal 87; see T86. Terminal 87a; this is the starter override. You should get 12v here when the starter is engaged (with the key). Terminal 30; this terminal goes directly to fuel pump, cold start, and other control systems. I'm not sure if you can test (for continuity) this terminal to ground; you may (or better yet, should) have to test it to the fuel pump plug (not the brown wire). Test these things out and let me know the results. Also: something I discovered on my 911 is that if I replace the fuel pump relay with a standard one, the fuel pump would come as soon as the ignition is turned on. Good luck james > > WLB434@aol.com wrote: > > > My fuel pumps (2) wont engage when I turn on the key. There is power to the > > relay, which I have changed, hoping that would fix the problem, but no. SO, > > maybe the switch, or a fuse??? I have tried to get wireing diagrams on this > > subject but no luck, yet. In any case, I can remove the relay switch, and > > use a jumper wire, and the pumps work!!!. > > > > William L. Barrett > > 301 w. 42nd street > > Sand Springs, OK. 74063 > > > > wlb434@aol.com