Tricky-Ricky Posted December 23, 2007 Share Posted December 23, 2007 I want to quieten down my exhaust as its getting on my nerves, so there are stainless absorption silencers available, but the largest size is 2.5" do you think that welding in a section that is 1/2" smaller than my existing pipe, somewhere before the tail pipe will make any real difference? i know that its possible and sometimes advised on some applications to have a tapering exhaust system on some turbo cars, but i am still a little weary, as my baffle that i made for my last exhaust 5Zigan 3.5" dia, lost 50 bhp on the dyno, and it wasn't particularly restrictive, so i have a dilemma. Quote Link to comment Share on other sites More sharing options...
bignum Posted December 23, 2007 Share Posted December 23, 2007 I`m interested in something like this as i want to quiten my car down, with the bung in my nurspec it lost around 35hp on the dyno. Quote Link to comment Share on other sites More sharing options...
Mike B Posted December 23, 2007 Share Posted December 23, 2007 me too, I had a big back box made for the 4" and that helped, but did not kill the drone. I heatwrapped the main section under my seat; that helped too, I may do the rest. Michel Lane was talking about fitting an apexi butterfly valve that you can engage for pottering and then free flow for a blast. My old subaru had one of these, and they are widespread on a number of high performance cars as stock, but they are all automatic, from my knowledge the apexi one is manual. and apexi have now gone bust! Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 23, 2007 Author Share Posted December 23, 2007 Well i already have an Apexi valve fitted, and although it quietens things down a bit, its also a pain as in time it gets stiff and doesn't open fully, it is also no good if you want to squirt out of a junction quick as it acts like a fuel cut and you suddenly loose lots of power and end up nearly getting hit by the cars your trying to get out in front of in time:( Robert gave me a link to a US site that seems to have absorption silencers in stainless with 3" in and out that would be just right, and they are $68.95 maybe a group buy is in order, to cut down on shipping charges? Quote Link to comment Share on other sites More sharing options...
Ric Posted December 23, 2007 Share Posted December 23, 2007 just buy a quieter exhaust Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 23, 2007 Author Share Posted December 23, 2007 But i like this one, and I'm damed if I'm going to pay even more money for another exhaust, one of the most over priced aftermarket bits for a Supra, and yes my middle name is Ebenezer Quote Link to comment Share on other sites More sharing options...
Mike B Posted December 23, 2007 Share Posted December 23, 2007 Well i already have an Apexi valve fitted, and although it quietens things down a bit, its also a pain as in time it gets stiff and doesn't open fully, it is also no good if you want to squirt out of a junction quick as it acts like a fuel cut and you suddenly loose lots of power and end up nearly getting hit by the cars your trying to get out in front of in time:( wow, thanks for sharing that with me. I'm giving up on that one then! The noise is good on mine but it is the resonance in the pipe, the drone at 3-3.6k (80mph on the motorway) that does my head in. At 100 it is silent, at 60 the same. I'm going to wrap the rest of the exhaust as the drone is only coming from the unwrapped section. With a 4" system there is absolutely no room for an additional silencer. I've been thinking about it and it must be the flex in the pipe that causes the resonance, so if you can stiffen or damp that it would cure it. It's even been suggested that a stiffner bar clamped to it would help. Sounds a bit crude though. Quote Link to comment Share on other sites More sharing options...
bignum Posted December 23, 2007 Share Posted December 23, 2007 silencers in stainless with 3" in and out that would be just right, and they are $68.95 maybe a group buy is in order, to cut down on shipping charges?[/quote I`d be up for that Quote Link to comment Share on other sites More sharing options...
paul mac Posted December 25, 2007 Share Posted December 25, 2007 silencers in stainless with 3" in and out that would be just right, and they are $68.95 maybe a group buy is in order, to cut down on shipping charges?[/quote I`d be up for that yep me to as i'me building my own 3", have you any specs on the ones you have seen, length, oval, round, etc Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 26, 2007 Author Share Posted December 26, 2007 Well my favourite so far is this one http://store.summitracing.com/partdetail.asp?autofilter=1&part=MPE%2D14419&N=700+0&autoview=sku but if anyone can find a better, post it up, i was thinking this one because of its relatively small overall size, its also straight through, just perforated and glass packed, so no restrictions, and its cheap, since its a bit of an experiment, as we have no idea how well it will silence. Quote Link to comment Share on other sites More sharing options...
Chiefgroover Posted December 26, 2007 Share Posted December 26, 2007 Tanabe touring is your friend, I have one and love it. I hope to record the exhaust this week so I'll post it. Quote Link to comment Share on other sites More sharing options...
bignum Posted December 26, 2007 Share Posted December 26, 2007 Tanabe touring is your friend, I have one and love it. I hope to record the exhaust this week so I'll post it. Yes please do. Quote Link to comment Share on other sites More sharing options...
b_have Posted December 26, 2007 Share Posted December 26, 2007 I've just fitted a Tenabe, almost as quiet as stock on idle. Just need to get rid of the screamer pipe now Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 26, 2007 Author Share Posted December 26, 2007 I suspect they may just be a little more than $68.95:p Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted December 27, 2007 Share Posted December 27, 2007 Forgive me if I'm being stupid, but can't the problem of losing large bhp by putting on a more restrictive exhaust be circumvented by just upping the duty cycle on a boost controller? I lost about 0.3 bar of boost when I switched from my 4" BL to the 3" TRD exhaust (which is extraordinarily quiet). With BC off, it dropped from 0.8 bar (with the old exhaust) to 0.5 bar. With the boost controller on, each channel lost about 0.2 bar. I'm presuming that by upping the boost controller, I'll now be getting the same power, but with EGTs a bit higher. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 27, 2007 Author Share Posted December 27, 2007 Unfortunately no it doesn't quite work like that, although your theory is sound, and you can recover lost boost to a degree by adjusting the boost controller, you are actually shooting yourself in the foot as you are making the turbo work harder to martian boost therefor adding more heat into the equation, which in turn saps power, Example i added a bung to my old exhaust, can't remember if i needed to adjust my boost controller, but if so it cant have been by much as i would have remembered, but the upshot was that i lost 50BHP for the same boost. Quote Link to comment Share on other sites More sharing options...
Dash Rendar Posted December 27, 2007 Share Posted December 27, 2007 Jeeze. Now I feel a bit gutted. I didn't realise that when I changed my exhaust. When I've got some money (hah!) and a car that works (hah again!) I might have another think about the exhaust I'm using. Quote Link to comment Share on other sites More sharing options...
lockys96 Posted December 27, 2007 Share Posted December 27, 2007 what about these? http://www.burnsstainless.com/ the smallest silencer they do is 6" long, perhaps weld an additional one in. http://www.burnsstainless.com/UltraliteMuffler/SSmuf-7.gif Ultra-Light Stainless Steel Race Mufflers I.D. O.D. Length Wt. lbs Part Number Each 2" 4-1/2" 14" 2.96 SM-200-450-14 232.05 2-1/2" 3-1/2" 12" 1.87 SM-250-350-12 212.16 2-1/2" 3-1/2" 17-1/8" 2.61 SM-250-350-17 236.59 2-1/2" 4-1/2" 17-1/8" 3.56 SM-250-450-17 247.23 2-1/4" 4-1/2" 14" 2.90 SM-225-450-14 233.47 3" 4-1/2" 12" 2.40 SM-300-450-12 202.32 3" 4-1/2" 17-1/8" 3.53 SM-300-450-17 242.47 3" 6 1/4" 17" 5.00 SM-300-625-17 298.50 3-1/2" 4-1/2" 12" 2.30 SM-350-450-12 234.34 3-1/2" 4-1/2" 17-1/8" 3.23 SM-350-450-17 250.68 3-1/2" 4-1/2" 6" 1.02 SM-350-450-6 226.04 4" 5-1/2" 12" 2.80 SM-400-550-12 243.13 4" 5-1/2" 17-1/8" 4.00 SM-400-550-17 260.16 4" 5-1/2" 6" 1.50 SM-400-550-6 232.16 4" 5-1/2" 9-3/4" 2.24 SM-400-550-9 243.13 4-1/2" 6" 15" 4.39 SM-450-600-15 264.31 4-1/2" 6" 6" 1.46 SM-450-600-6 234.47 4-1/2" 6" 9" 2.57 SM-450-600-9 242.03 5" 6" 12" 3.65 SM-500-600-12 241.42 5" 6" 17" 4.72 SM-500-600-17 269.96 5" 6" 6" 1.50 SM-500-600-6 235.93 5" 6" 9" 2.50 SM-500-600-9 248.99 Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 28, 2007 Author Share Posted December 28, 2007 Fook! if thats the prices on the end, thats more than half the price of some of the jap exhausts:blink: and the same in some cases as mine cost:blink: errr pass:p Quote Link to comment Share on other sites More sharing options...
lockys96 Posted December 28, 2007 Share Posted December 28, 2007 £120 for a silencer isnt bad for lightweight, non chav Quote Link to comment Share on other sites More sharing options...
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