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back pressure?
Topic Started: Mon Mar 12, 2012 6:24 pm (1,200 Views)
Kiefer
The wannabe
[ *  * ]
right so my wise mystical father has decided to half tell me about about back pressure in the exhaust system being needed, the details i know are quite sketchy the main reason i ask is that iv fitted a straight through system on my 2.0l (not because i wanted to either) and well either engiens on the way out or the staight through has ruined the power throttle response is kack and top end takes forever and embarrisingly i had a 1.0l polo up my ass and took me ages to finally pull away, so if anyone can elabarate be much appreciated cheers
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Daliscar
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Always On The Ball
[ *  *  *  *  *  *  *  *  * ]
Try a Google question mate, whilst you await the thoughts of one or two of the forum's esteemed
M.B. W201 learned gurus.....http://www.8thcivic.com/forums/bolt-ons-all-motor/106817-exhaust-backpressure-explained-possible-sticky.html
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alogaparaloga
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crazy mind
[ *  *  * ]
Did you touch your manifold, CAT and downpipes?
Are you sure that your injection & Ignition works OK?
What silencers did you put on and what pipe OD?

I have a 1.8 lt with stock manifold and downpipes (std pre-cats) and straight through 2.25" pipework, high flow metallic CAT and 2 Magnaflow 2.5" core straight silencers and the system works fine above 2000 RPM with the K Jetronic.
Edited by alogaparaloga, Mon Mar 12, 2012 6:47 pm.
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Kiefer
The wannabe
[ *  * ]
well basically removed everything from front pipe to back box including cat as everything was destroyed thanks to the idiot that lowered it, iv literally just fitted the first bit of exhaust piping i could get hold of for bout ten quid, so the system is no where near proper but sufficient to get me from a to b, sounds great just the perfomance lost
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Kiefer
The wannabe
[ *  * ]
daliscar
Mon Mar 12, 2012 6:34 pm
Try a Google question mate, whilst you await the thoughts of one or two of the forum's esteemed
M.B. W201 learned gurus.....http://www.8thcivic.com/forums/bolt-ons-all-motor/106817-exhaust-backpressure-explained-possible-sticky.html
sorry missed your reply just had a read of the topic very interesting stuff just a shame im only a student mechanic and not at the level to put the information to good use, by the looks of it i need to base the exhaust flow velocity to the rpm range where i want the power, so 4000 onwards seems to be wheres its most gutless and thats alli can say an no idea what to do ahhh the tribulations of being young and still in education :D but thanks for the link fella iv saved it all for checking later on
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alogaparaloga
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crazy mind
[ *  *  * ]
What is the pipe OD of your system?
If you left the collector untouched it should be OK, but if you didn't replace the cat with another one or a small silencer the system becomes way too free.
Also with your problem being at higher RPM it means that your fueling will need some adjustment or reconditioning.
High RPM power loss equals lean burning mixture.
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balamb37
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Grumpy Old Grampa with Dog
[ *  *  *  *  *  * ]
If it had a 'Cat' on it and you removed it, I hope you didn't remove the 'Lamda Sensor' as without that you won't get it running as it should, it will always be in 'Emergency Mode' which in turn will give you a far higher fuel consumption. ;)
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Big Ben
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Sneaky 2.5-16 Driver!
[ *  *  *  *  *  * ]
L reg 190's had cats. If you want your car to run right you will need to re-install your lambda sensor. With new MOT regulations coming into force soon, unless your car is an import from outside the EU, you will need to re-install an approved cat. If you continue to run your car as it is you could seriously damage the engine.
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Kiefer
The wannabe
[ *  * ]
alogaparaloga
Mon Mar 12, 2012 8:05 pm
What is the pipe OD of your system?
If you left the collector untouched it should be OK, but if you didn't replace the cat with another one or a small silencer the system becomes way too free.
Also with your problem being at higher RPM it means that your fueling will need some adjustment or reconditioning.
High RPM power loss equals lean burning mixture.
pipe OD? do you mean the width overall dimension? :/ if thats what you mean the bit of piping i bough is 2'5 inches welded from front pipe to the originan back box pipe which is then welded to the aftermarket backbox, i didnt replace the cat just because of pricing and how much of a budget im on im aiming to get another cat tho just to reduce the gases stinking up my car lol ah yes most of the time can smell it overfuelling as well im not 100% on hot to adjust the mixture as like i said still a newbie technician and new to the 190e world, thanks for all the info and suggestions much appreciated.
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Kiefer
The wannabe
[ *  * ]
balamb37
Tue Mar 13, 2012 3:43 pm
If it had a 'Cat' on it and you removed it, I hope you didn't remove the 'Lamda Sensor' as without that you won't get it running as it should, it will always be in 'Emergency Mode' which in turn will give you a far higher fuel consumption. ;)
yhh removed the cat but left the lambda sensor as its before the cat so removing the cat makes no effect on the ecu? oh its a new lamda as well but from ecp.
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Kiefer
The wannabe
[ *  * ]
Big Ben
Tue Mar 13, 2012 5:42 pm
L reg 190's had cats. If you want your car to run right you will need to re-install your lambda sensor. With new MOT regulations coming into force soon, unless your car is an import from outside the EU, you will need to re-install an approved cat. If you continue to run your car as it is you could seriously damage the engine.
hi mate didnt remove the lambda, also of course i like my to be legal when im driving but mot's arent an issue but i wont say any further than that, thanks for the concern and info cheers.
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