POC Posted January 20, 2003 Share Posted January 20, 2003 Right, thats whats currently sitting on the back of my westie, not happy with it at all. Yesterday I removed the spare and all the gubbings that go with it, chopped the zorsts flush(ish) with the rear of the tub...... doesnt look great due to the exit pipes running into a small bore exhaust, so over the next couple of weeks I will send the car to have a custom exhaust made. The bore of the exhaust will be 3in and almost straight through, with removable boxes to 'tone' it down a little for track use. I am unsure what kind of 'finish' to have with regard to the tail pipe(s), I will not be opting for a side exit exhaust as I do not want to cut the bodywork, I quite like the twin rear exits .... What would you have done? 2 x in the middle (boxster) 2 x one of either side of car, like it is but done propper 1 x 3in round exit (or 3.5in) 2 x side exits, coming from under the car, out either side before the rear wings Any other ideas? TIA Paul Quote Link to comment Share on other sites More sharing options...
Westfields Rock On Posted January 20, 2003 Share Posted January 20, 2003 Its nice as it is. Our Mk III spitfire has the same thing as you have. Do it the same with one of those funky rear skirts/spoilers. make sure the exit pipes are chrome too. Quote Link to comment Share on other sites More sharing options...
POC Posted January 20, 2003 Author Share Posted January 20, 2003 was funny when i took the spare off and the hanger, the car looked like a wheelbarrow Grinder soon sorted that out though Quote Link to comment Share on other sites More sharing options...
Mike H Posted January 20, 2003 Share Posted January 20, 2003 One big one where the spare wheel used to be! Straight out throught the bodywork Seriously tho', one in the middle would make your car quite unique. But I would stick with the twin exit, similar to your current one but done properly. Mike Quote Link to comment Share on other sites More sharing options...
POC Posted January 20, 2003 Author Share Posted January 20, 2003 Mike, that has been considered mate, not to sure about having the hot pipes running so close to the fuel tank. Would look cool to have the pipe(s) exit out of the bodywork, with some stainless trimming the holes so the body dont get melted! Im leaning toward a 3in pipe on either side of the car, or one 3in on the driver side - this may look odd though. Cheers Paul Quote Link to comment Share on other sites More sharing options...
Bananaman Posted January 20, 2003 Share Posted January 20, 2003 2 x in the middle (boxster) Gets my vote Andy P.S. POC have you tryed the 'New Poll button? try it & put you suggestions on. Quote Link to comment Share on other sites More sharing options...
neo Posted January 20, 2003 Share Posted January 20, 2003 i like the sound of one ethier side in front of the rear wheels done proper will sound better as well compared to both together, just my opinion like Quote Link to comment Share on other sites More sharing options...
POC Posted January 21, 2003 Author Share Posted January 21, 2003 a single straight through 3in pipe coming straight down the drivers side of the car and out the back would give a decent performace increase too, serious flow. The current exhaust looks to be very restrictive I think I may lean towards a simple performancing enhancing zorst rather than a tarty option..... mmmm more power... Quote Link to comment Share on other sites More sharing options...
Mike H Posted January 21, 2003 Share Posted January 21, 2003 I keep coming back to the idea of exiting the bodywork at the rear. Here's an example of a Golf that the brother of one of my friends built which does just that: But then it is twin engined! Mike Quote Link to comment Share on other sites More sharing options...
POC Posted January 21, 2003 Author Share Posted January 21, 2003 that does look cool, but there is a good chance the fuel tank will be in the way? doubt it will be good for the flow either as the pipes will have to come from under the car, bend upwards then bend again to come out the rear of the tub?? Would the pipes be too hot to run next to the fuel tank? How much room do I have in there? Cheers paul Quote Link to comment Share on other sites More sharing options...
Ian Gratton Posted January 21, 2003 Share Posted January 21, 2003 Hi Paul, the hottest part of the exhaust system is probably the manifold. On our XTR2 the manifold is directly above the fuel cell which was a little worrying to begin with. This hasn't caused us a problem (we are obviously both still alive). We do however appear to get fuel surge/starvation which is probably more to do with the swirlpot being very close to the manifold - wonder if its evaporating I would imagine the manifold on a turbocharged car (or any car for that matter) will be approx 900 degrees. My old P1 used to hit 750degrees in the downpipe, the headers/manifold on a scooby runs about 900. Haven't got an EGT gauge on the westi so haven't got a clue what ours is at the moment. The best you can do is have an exhaust system with the minimum number of bends. I know the system that is built for the R1 to give duccati style under-seat tail pipes robs the engine of about 15bhp due to the 2 90degree bends - not good for outright performance Why are you so against side exit m8 johnf's westi used to kick some fantastic flames out of the side on his ZEi and it seems quite typical to use one on a westi - are you just trying to be a bit different ? There is always the option of a tractor style exhaust sticking straight up with a flap on top - now that would be different Quote Link to comment Share on other sites More sharing options...
POC Posted January 21, 2003 Author Share Posted January 21, 2003 Thanks Ian, thats a good reply! I dont want a side exit for two reasons, 1) I dont want to chop the bodywork as i like the smooth look. 2) Individuality is the name of the game at the end of the day.... I think I am just going to have a 3in pipe from the turbo, running along the length of the car and out the back, as straight as they can make it (with a removable section in the middle to put in a silencer box) As for the heat evapping the fuel, i think consumption is bad enough without that contributing. On reflection though I doubt the pipes at the rear of the car will be hot enough to evap/ignite the fuel/fueltank? Hummm..... tractor pipe, could be interesting Quote Link to comment Share on other sites More sharing options...
Ian Gratton Posted January 21, 2003 Share Posted January 21, 2003 Whilst you are at it get them to make you a proper tubular manifold and turbo uppipe. I think the std cast cossie manifold can be bettered. Dingy is doing this as we speak to the MkII - Mkii escort with cossie engine - 600bhp anyone Haven't even got a clue what cossie/yb manifolds and turbo uppipes look like. Ok - you seem fairly convinced about not going side exit - I won''t tell you again As you are going to run a rear exit system I guess the pipework runs under the car (i.e. under the floorpan). I can think of an issue where if you lower the car and get the geometry sorted for the track it could leave you without much ground clearance. Can you take a shot of the exhaust routing under the car ? Quote Link to comment Share on other sites More sharing options...
Blatman Posted January 21, 2003 Share Posted January 21, 2003 It might get a bit warm in the drivers compartment with an exhaust under the floor in that area........p'raps you should look at securing some "turbo" blanket (or any other kind of heat barrier) to the floor or exhaust as well....... Quote Link to comment Share on other sites More sharing options...
POC Posted January 21, 2003 Author Share Posted January 21, 2003 Hi Ian, the current zorst system appears to come down the middle of the car (im far too lazy to crawl about on the floor to check), the rear box actualy sits directly under the rear diff (and is hammered to S***! ) I dont think clearance of the new system will be a problem as it will not be taking the same route, current system has about 3/4in of ground clearance. Blatters, good point mate, I will get some of that and make sure i dont burn my I did try to get the car reversed on the ramps last weekend, but the wheels were just spinning cos it was damp Quote Link to comment Share on other sites More sharing options...
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