Tom1809 Posted July 12, 2011 Share Posted July 12, 2011 Yesterday I decided after a little reading on the forum that I would cut up my standard exhaust system and make a straight through side exhaust. I havnt increased the bore of the pipe but just removed the 3 boxes and brought it out in front of the rear wheel. Driving around today has seen a significant increase of power, it has made my defender so much more drivable and from what I can see from the miles I have covered today it's doing better mpg. The only thing that has started to play on my mind is that I have I now made something that I'm gaining the benefits from now but in the long run going to cause me headaches and more money in the land rover piggy bank. What are the downsides? Also if I was now to increase the fueling slightly would that cause any problems? Cheers Tom Ps it's a 200tdi disco block with defender turbo and cases with roughly seeing 170,000 miles Quote Link to comment Share on other sites More sharing options...
western Posted July 12, 2011 Share Posted July 12, 2011 guessing it's a 90 [as you haven't specified] you might find exhaust gases entering the vehicle when stationary with the left window open, but otherwise it shouldn't cause any problems. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted July 12, 2011 Share Posted July 12, 2011 Turbo will kill the sound a lot, but at high revs it might be deemed too loud. Exhaust in front of the rear wheel is a very common alteration and I've not heard of anyone suffering from internal fumes. Turbo will supply sufficient back pressure, so the engine won't suffer from it. Les. Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted July 12, 2011 Share Posted July 12, 2011 I'm told that not enough back pressure with cause oil starvation in the turbo through excess scavenge.... Might be worth checking on this Quote Link to comment Share on other sites More sharing options...
Phillis Posted July 12, 2011 Share Posted July 12, 2011 Vosa wasnt happy when i had mine straight through 200tdi disco block in a 90, but mine had a big k n N airfilter on it, made me put a silencer in it,and take it for a mot.. Quote Link to comment Share on other sites More sharing options...
Tom1809 Posted July 12, 2011 Author Share Posted July 12, 2011 The sound isnt to bad at all, defiantly not as loud as some of the scoobys n BMW around here. I will have to see about the exhuast gases don't really want to the gf moaning as I can still hear the radio. Interested in this problem with the turbo? Any more on this? Cheers Tom Ps it's a k reg defender Quote Link to comment Share on other sites More sharing options...
western Posted July 12, 2011 Share Posted July 12, 2011 Ps it's a k reg defender 90 or 110 ? Quote Link to comment Share on other sites More sharing options...
discomikey Posted July 12, 2011 Share Posted July 12, 2011 many many many poeple have straight throughs on land rover TDIs i never heard of any problems relating to it whatsoever if the MOT man fails it on noise, take it down the road. they are under the noise levels (just) so its at the MOT-ers descretion Quote Link to comment Share on other sites More sharing options...
Tom1809 Posted July 12, 2011 Author Share Posted July 12, 2011 Sorry it's 90, I've seen a loads of pictures with defenders with side exits and a few bids so I thought it was legal, Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted July 12, 2011 Share Posted July 12, 2011 After experiencing a no-silencer exhaust (mine fell off!) I'd never remove them from a vehicle. The noise and turbo whine was horrible, even for the 1/2 day I was driving it like that! Side exit with one (centre) silencer is as far as I'd go, and even then if it was too noisy I'd change it back. Quote Link to comment Share on other sites More sharing options...
landroversforever Posted July 12, 2011 Share Posted July 12, 2011 My truck has the exhaust exiting just behind the passenger door. Only time I ever get fumes in the cab is occasionally with the puff of smoke on start up. I love the sound mine makes with such a short pipe and a small cherry bomb (Thanks to Siwhite). Quote Link to comment Share on other sites More sharing options...
smokinv8 Posted July 13, 2011 Share Posted July 13, 2011 My truck has the exhaust exiting just behind the passenger door. Only time I ever get fumes in the cab is occasionally with the puff of smoke on start up. I love the sound mine makes with such a short pipe and a small cherry bomb (Thanks to Siwhite). Is yours on the road often enough to hear it? Quote Link to comment Share on other sites More sharing options...
brighouse shed Posted July 13, 2011 Share Posted July 13, 2011 hate to upset anyone but straight thru exhausts on normal cars make bugger all difference. In a previous life I sold roots blowers which need lots of silencing. Our silencer bod had a side line doing stright thru manifolds and cherry bomb straight thrus for several euro touring cars inc volvo V70 SW. He also sold to cavalier sri owners but confessed that when they tested them on dyno bed it made less than 2 bhp diiference at the flywheel. in the touring cars 350 bhp+ they gained an extra 20-30 bhp mainly cos of the reduced back pressure. So I think unless you have a very different TDi to mine it's all an audial illusion, in the same way if you get one of the vauxhall insignias which sport button there is no more actual power but it the ecu revs more quickly so feels much more powerful Quote Link to comment Share on other sites More sharing options...
landroversforever Posted July 13, 2011 Share Posted July 13, 2011 I think that's the point though... with a straight through pipe, the engine can rev more freely and therefore seem more powerful as its coming more quickly? Quote Link to comment Share on other sites More sharing options...
discomikey Posted July 13, 2011 Share Posted July 13, 2011 on non turbo'd vehicles. yes youre right, bugger all difference. but with a non restrictive exhaust i.e. straight through, the turbo can spool up much quicker, which improves power earlier in the rev range, it wont stall as much at high revs cos therees less backpressure, and because it spools quicker and earlier, it burns more efficiently. Quote Link to comment Share on other sites More sharing options...
brighouse shed Posted July 13, 2011 Share Posted July 13, 2011 can almost go with that but TDi has a soil pipe for an exhaust so still going to make no difference. if you ever lose the manifold gasket tween header and down pipe you will notice shed load of noise but nothing else. the engine hasn't enough draw to get backfiring. Now try it with an old rover vitesse and hear it pop and the power will rise a bit. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted July 13, 2011 Share Posted July 13, 2011 Those that I know that have removed all the silencers have complained that the drone at motorway speeds is headache inducing on longer trips. The refitting of one of the original silencers seems to eliminate it. HTH Mo Quote Link to comment Share on other sites More sharing options...
honitonhobbit Posted July 13, 2011 Share Posted July 13, 2011 I've found that no silencers isn't as good as just the back box... Quote Link to comment Share on other sites More sharing options...
discomikey Posted July 14, 2011 Share Posted July 14, 2011 well i do have just the standard disco 1 back box, it does sound sweet, quiet at low revs, growls reasonably nicely, turbo whistles and spools well and never had any noise issues even at 70+ (yes i know it is a series but quite modified and will touch 90-95) Quote Link to comment Share on other sites More sharing options...
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