Nick Speed Posted November 4, 2001 Share Posted November 4, 2001 Any thoughts on upgrading the exhaust on a Vauxhall (standard apart from Weber Alpha 3D, QED Q42H cams and rechoked/jetted carbs)? What likely advantage is to be had over the standard Caterham sports exhaust? And if so what to? Caterham do a larger system - any good? What are the other options? Does an upgrade just involve the collector, silencer and tailpipe? Cheers Nick Link to comment Share on other sites More sharing options...
captain chaos Posted November 4, 2001 Share Posted November 4, 2001 Nick, A recent thread entitled 'Exhaust Advice' will have a wider range of info but in brief, the current caterham 4:1 comp system (which I have at the moment) has very unequal primaries and a restrictive bore which has a detrimental effect on performance. A system with equal length primaries, 2.75/3" collector bore and a 4:2:1 configuration will hopefully give a little more top end bhp, but more importantly give a decent dollop of extra mid-range torque. Link to comment Share on other sites More sharing options...
captain chaos Posted November 4, 2001 Share Posted November 4, 2001 PS Generally this does mean a complete new system, but one which is re-packable. I'm sure you could just upgrade the box but the main performance benefits are in getting the primaries right. Link to comment Share on other sites More sharing options...
EFA Posted November 4, 2001 Share Posted November 4, 2001 Nick, On this spec engine, changing the exhaust will give little improvement over the std system, as ALL the Caterhams systems suffer from the same limitations - unequal length primaries, restricted (curved) primaries, non 4-2-1 configuration, and except the JPE system, restrictive pipe diamters (promary and collector/silencer) Best way to improve your car is injection. Q420's should give you a good 220 bhp on Jnevey SF throttle bodies. Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
EFA Posted November 4, 2001 Share Posted November 4, 2001 Thats funny, same comments at the same time from two different people! Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
captain chaos Posted November 4, 2001 Share Posted November 4, 2001 Arnie, There you go, see, I do listen to you! Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted November 5, 2001 Share Posted November 5, 2001 So if 4-2-1 is the way to go, where do you get it from? SBD's system looks a good improvement on the OE system but it ain't cheap at a grand. Any alternatives Without having to exit via the bonnet please) Alex Link to comment Share on other sites More sharing options...
Marius Posted November 5, 2001 Share Posted November 5, 2001 I´ll receive my SBD-manifold + silencer tomorrow (hopefully), will be dynoed then next month. I´ll keep you updated about the results... Marius P.S.: Steve slightly lowered the price for the manifold (I think 80quid cheaper or so, don´t remember exactly) Link to comment Share on other sites More sharing options...
Geoff Johnson Posted November 5, 2001 Share Posted November 5, 2001 I have a 4:2:1 exhaust, bought from James Whiting earlier this year, very nice too. Tuned lenghts etc etc. Worth a phone call. Geoff Link to comment Share on other sites More sharing options...
EFA Posted November 5, 2001 Share Posted November 5, 2001 Alex, You can get them made to your own spec by any competent exhaust manufacturer: BTB Hayward and Scott Anyone paying a grand for a manifold on its own which is produced from a jig as a batch is paying through the nose. One off manifolds such as mine are cheap and well made for around £800 by Hayward and Scott. 01268 727256 Ask for Ian, tell himm Arnie sent you...... Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
captain chaos Posted November 5, 2001 Share Posted November 5, 2001 Alex, I spoke to both BTB and SBD about a full system. I decided to go with SBD because of cost and lead times. BTB wanted nearly 1400 quid for their system and the SBD version is just over a grand plus a fee for the Camcoat. SBD have also just reduced the cost of their manifolds. Also SBD quoted 4 weeks, whereas BTB were busy and felt 5/6 weeks was more likely. Link to comment Share on other sites More sharing options...
Blatman Posted November 5, 2001 Share Posted November 5, 2001 Thread hi-jack alertid=red> Sorry Nick smile.gif Arn/Alex Can the Q420's be used with hydraulic followersquestion.gif Edited by - Blatman on 5 Nov 2001 18:42:37 Link to comment Share on other sites More sharing options...
Tazio Posted November 5, 2001 Share Posted November 5, 2001 There's a company called ' Exhaust by Design' who fabricated the 4-2-1 system on Dave Kimberley's Curbourough FTD car, who quoted me around £520 for a 4-1 system including repackable silencer - I also believe they have done work for Peter Carmichael's K too. The premises are very low tech so he has no real overheads, said he would need the car for a couple of days - website is www.exhasutbydesign.co.uk Alan L7 FUN NotSoLightVx - but with 262.5Bhp! Edited by - tazio on 6 Nov 2001 19:47:56 Link to comment Share on other sites More sharing options...
Paul McKenzie Posted November 5, 2001 Share Posted November 5, 2001 Blatman, Go to QED's web site for the info on their camshaft requirements Paul Link to comment Share on other sites More sharing options...
Blatman Posted November 5, 2001 Share Posted November 5, 2001 Now why didn't I think of that........thumbsup.gif Link to comment Share on other sites More sharing options...
Marius Posted November 7, 2001 Share Posted November 7, 2001 Received my SBD-system yesterday, looks fantastic, excellent welding job. Hope it will work as good as it looks but I haven´t got too much doubt... The system was wrapped in a large box which still showed some TITAN-Motorsport stickers, so that´ll be the place where they´re being made for SBD. Marius Link to comment Share on other sites More sharing options...
EFA Posted November 7, 2001 Share Posted November 7, 2001 The metalwork of SBD's exploding carbon silencers used to be made by BTB. Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted November 7, 2001 Share Posted November 7, 2001 Blatters, It's not recommended, but it's also very cheap to modify hydraulic tappets into non hydraulic ones. Alex Link to comment Share on other sites More sharing options...
Harry Flatters Posted November 7, 2001 Share Posted November 7, 2001 So bitter Arnie! Steve Mell PTM 88 Link to comment Share on other sites More sharing options...
EFA Posted November 7, 2001 Share Posted November 7, 2001 Steve, No I'm just jealous.....wink.gif Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Chelspeed Posted November 7, 2001 Share Posted November 7, 2001 BTB used to make all of SBD's exhausts, manifolds and silencers. I know this 'cos they used my car at BTB's workshop to do the first manifold that didn't come thro the bonnet, same length and diameters but different layout. I guess if they don't use BTB anymore they must have found someone else cheaper to copy BTB's design. Link to comment Share on other sites More sharing options...
Marius Posted November 7, 2001 Share Posted November 7, 2001 Arnie, why "exploding" ? I know you´re not best friend with Steve but what happenend to your carbon-silencer ? I recently saw some pictures of K2RUM being equipped with one some time ago. SBD recommends not to use this silencer on engines which are "prone to detonate"... Marius Link to comment Share on other sites More sharing options...
Mike C Posted November 7, 2001 Share Posted November 7, 2001 Blatters, Give me a call on 020 8603 9162. I used a company called Connaught, having been totally disatisfied with QED. I spoke with them again and have some VERY interesting news on Hydraulic cams. There has been much development in this area and my Vauxhall was dyno'd with 228bhp on a pair of hydraulic cams. They are a fabulous profile and I have now problem keeping up with Arnies Car. Hot news is, these cams were fitted two years ago and better profiles are now available. Give us a call and I'll happily chat with you about this. Connaught build F1 engines for hill climb cars and the owner, Phil Price was European Hill Climb Champion 5 years ago. Great guy, excellent service and no Bul**it advice unlike the others!!!! Cheers Mike Link to comment Share on other sites More sharing options...
EFA Posted November 7, 2001 Share Posted November 7, 2001 Mike, Your car is dead slow - over 5 secs to 60 I seem to remember..... Marius, the carbon can on the SBD silencer is not rigid!! As a result it shatters into lots of fragments. Before Graham tells me off (again) I know of at least 3 people this has effected. Graham, You cannot get a 33" pri, 17" sec system with silencer on a car without exiting out of the side of the bonnet. Or not unless its rather curved! (restrictive) Fat Arn The NOW PROVEN R500 Eaterid=red> See the Lotus Seven Club 4 Counties Area Website hereid=green> Link to comment Share on other sites More sharing options...
Mummy Bear Posted November 7, 2001 Share Posted November 7, 2001 "Disatisfied with QED" eh Arnie? Link to comment Share on other sites More sharing options...
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