bertie Posted June 8, 2007 Share Posted June 8, 2007 Anyone got a pic of the Caterham Rear exit system that fits the R3/4/500? In particular how it fits underneath the car? Even though I've got a Raceco side exit silencer and an airbox on I'm still highly dubious about passing Donningtons 98dB noise regs. My other thought was to get a rear exit pipe made up for the Raceco? Anyone else tried this?? Link to comment Share on other sites More sharing options...
CageyH Posted June 8, 2007 Share Posted June 8, 2007 DaveJ was looking at this a while back, but for his home-made exhaust. Only dead fish go with the flow....! Link to comment Share on other sites More sharing options...
Gridgway Posted June 8, 2007 Share Posted June 8, 2007 got a pic of the rear box on my (ex) R500. Where shall I send it? Graham Link to comment Share on other sites More sharing options...
rj Posted June 9, 2007 Share Posted June 9, 2007 To mee too please mlist -at- rj.dk /regin Link to comment Share on other sites More sharing options...
rj Posted June 9, 2007 Share Posted June 9, 2007 Thanks Graham. Very nice system! Could you tell me who made it? Regards Regin Link to comment Share on other sites More sharing options...
bertie Posted June 9, 2007 Author Share Posted June 9, 2007 Garham, YHM, thanks. 😬 Link to comment Share on other sites More sharing options...
MikeE Posted June 10, 2007 Share Posted June 10, 2007 DannyLT was talking to me the other day about getting Ammo (RaceCo) to do a rear exit exhaust for his 300bhp Duratec. R400 Duratec Build and Modification Pictures here Link to comment Share on other sites More sharing options...
Gridgway Posted June 10, 2007 Share Posted June 10, 2007 Regin, it is standard Caterham kit. Probably made for them by Cheesemans in Woking. Graham Link to comment Share on other sites More sharing options...
dannylt Posted June 11, 2007 Share Posted June 11, 2007 Graham, can you send me the picture too? Yes - I am working hard on getting RaceCo to make a swappable rear exit option. I don't fancy the 98db Donington noise meter either. Link to comment Share on other sites More sharing options...
rj Posted June 11, 2007 Share Posted June 11, 2007 Graham, If it's ok for you I can upload it to a web server. /regin Link to comment Share on other sites More sharing options...
bertie Posted January 14, 2008 Author Share Posted January 14, 2008 Thought I'd ressurect this and see if anyone has any pics of the routing underneath or could take some and send it ....please! Still on this an I know Caterham have one so it must be possible, if someone can take some pics I'd be most grateful. Link to comment Share on other sites More sharing options...
rj Posted January 14, 2008 Share Posted January 14, 2008 here Link to comment Share on other sites More sharing options...
bertie Posted January 14, 2008 Author Share Posted January 14, 2008 RJ, you are a gentleman sir. It seems to reduce in diameter and then get crimped flat even more as it goes inside the rear wheel. Does it affect flow and thus the performance much? Link to comment Share on other sites More sharing options...
dannylt Posted January 14, 2008 Share Posted January 14, 2008 It definitely looks like that could affect performance on higher powered cars. My car lost noticeable power just reducing the 3 inch end pipe by a quarter! Do they all have to do that - is the simply no room for a large bore pipe to go past the wheel? It looks very close there in any case. I've stopped chasing quietness for this year since I'm going to primarily be using it on road. And I think Ammo is about to make it louder with new cams anyway. Link to comment Share on other sites More sharing options...
Gridgway Posted January 14, 2008 Share Posted January 14, 2008 on Dave Walker's old rolling road it robbed 8bhp from my (ex) R500 as compared to the original R500 side exit box. Well worth it for quiet track days. Graham Link to comment Share on other sites More sharing options...
dannylt Posted January 14, 2008 Share Posted January 14, 2008 Wow. That's definitely worth it. Was that exactly the same as the one pictured? Link to comment Share on other sites More sharing options...
Gridgway Posted January 14, 2008 Share Posted January 14, 2008 I would say it' s not exactly the same. I don't recall there being such a big step down in diameter nor it being flattened as much. I also don't recall the exit at the rear on the LHS. I'll have to go and look at my pics at home this evening. Graham Link to comment Share on other sites More sharing options...
bertie Posted January 14, 2008 Author Share Posted January 14, 2008 I don't suppose the Caterham one is pictured on the website? Link to comment Share on other sites More sharing options...
rj Posted January 14, 2008 Share Posted January 14, 2008 The one in my pictures is said to be an R500 item. It's not repackable, and yes there's a huge step down! I can't yet tell how much the difference in performance is, first trial was 4 miles on wet roads, that's why the car is so clean but it's unbelievable much more quiet than the side exit exhaust. I will know a lot more about the behaviour Saturday, where I'll also aim to take better pictures, and shall report. /regin Link to comment Share on other sites More sharing options...
rj Posted January 14, 2008 Share Posted January 14, 2008 The one on CC's website here looks repackable. Anyway, mine was a direct match to my R500 cat, and I think it's got a larger exit than most other systems. The original side exit exhaust is here /r Link to comment Share on other sites More sharing options...
Slipper man Posted January 14, 2008 Share Posted January 14, 2008 I have the R500 system, which looks the same as the one in the pictures and fits onto brackets already on the car. It has a modified R500 Titanium front box which feeds into a large rear box through which it passes twice (in other words, the rear box has two connected straight through silencers). The front box is repackable, the rear isn't. The exit, Graham, is on the left on mine. It is VERY quiet. Mine was recorded at Goodwood at 88dBA when I was there a few years back! With the standard sytem newishly packed it registered 106. I only ever use this system when I absolutely have to because subjectively it seems to kill the top end of the car's performance, and I assume the more I use it the less quiet it will be. Caterham told me it cuts 25BHP, which I can easily believe, but I have never put it on a rolling road to find out. If mine only loses 8 BHP I would be surprised, though the quietness may make it feel slower than it is I guess. To change systems over takes about 10 minutes and I always have it in the back of the truck just in case so at the next track day if you want to see it, ask me. Link to comment Share on other sites More sharing options...
Jason Plato Posted January 14, 2008 Share Posted January 14, 2008 I have considered the rear exit silencer to add quietness , but I pondered the routing passed the 8.5" rear wheel. It occure to me that it would be simpler to double back the exhaust directly above the present can. So the exhaust tailpipe could have a U section inserted which feeds into another 21" long silencer positioned above the present one with the exhaust exit at the front near the front wheel. It wont look pretty but as a temporary fix for quiet days it would work. The additional silencer would weigh another 3.7Kg so the rear exhaust bracket may need bracing - maybe the aditional silencer outlet could be suspended from the front of the SLR roll cage ?. here is C7 TOP Taffia rear gunner Edited by - Dave Jackson on 14 Jan 2008 20:20:56 Link to comment Share on other sites More sharing options...
Gridgway Posted January 14, 2008 Share Posted January 14, 2008 Just looked for some pics. My memory failed me! The exit is on the LHS and it looks exactly the same as the pics above. It def does not take 25bhp away though. I got 223bhp with the rear exhaust and 231 with the side exit. Graham Link to comment Share on other sites More sharing options...
rj Posted January 14, 2008 Share Posted January 14, 2008 Graham I guess you've had your car re-mapped for the quiet exhaust then? I suspect the more restricted system could cause the engine to run rich, and hence more power lost than if properly mapped Link to comment Share on other sites More sharing options...
Gridgway Posted January 14, 2008 Share Posted January 14, 2008 nope it was just running on the standard Minister map. It's not my car any more which is why my memory was a little vague on what the rear exhaust looked like. I decided that with only 8bhp difference, all was well. In fact it was bought with only the rear-exit system so it must have been ok!! Graham Link to comment Share on other sites More sharing options...
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