Can someone explain exhaust back pressure to me?
Discussion
300bhp/ton said:
Is it for this?
[url][img]http://thumbsnap.com/sc/neyACusC.png[/mg]|http://thumbsnap.com/neyACusC[url]
Back pressure is never good, however if you reduce back pressure and don't retune and optimise the A/F for the change, then performance can suffer. Tune the motor and it'll see more gains.
High back pressure can induce more low rpm torque, but will stifle power.
That said, an exhaust is an entire system and unless you are doing some proper (and major) mods on your Festa I seriously wouldn't worry too much, if at all. Although it's good to know the theory for when you've get a vehicle with a more substantially powerplant
Indeed it is. It's already running a Milltek 4-1 manifold and catback exhaust, was playing with the idea of a decat or sports cat but some people said I'd notice a power loss due to a reduction in back pressure, this is what prompted me to make this thread [url][img]http://thumbsnap.com/sc/neyACusC.png[/mg]|http://thumbsnap.com/neyACusC[url]
Back pressure is never good, however if you reduce back pressure and don't retune and optimise the A/F for the change, then performance can suffer. Tune the motor and it'll see more gains.
High back pressure can induce more low rpm torque, but will stifle power.
That said, an exhaust is an entire system and unless you are doing some proper (and major) mods on your Festa I seriously wouldn't worry too much, if at all. Although it's good to know the theory for when you've get a vehicle with a more substantially powerplant
Bigger things are planned next year (Cams, inlet and map) but wanted to get the car 'breathing' right (So to speak) first...
Edited by ezi on Thursday 4th October 20:25
Thanks for the help people, think I understand it a bit better now!
300bhp/ton:
I know where you're coming from with regards to the mods aswell, I'd be inclined to agree more though if I was trying to get more power out of a 60bhp Fiesta LX but as it stands, my ST model is a great platform to get more power out of (In my opinion, of course ). The 2.0 Duratec engine is in lots of other cars such as Caterham builds carrying silly power, so in this car it has a lot of potential, it comes out of the factory with 147bhp standard and with the mods I mentioned earlier there are others out there with 200bhp+ in these cars. Couple that with it's excellent handling, that makes it a bit more than a shopping trolley tbh
Depreciation wise I don't really care, these cars have lost so much value recently there really isn't much more to lose and any modifications can make there money back by splitting it when I part with it in a couple of years
300bhp/ton:
I know where you're coming from with regards to the mods aswell, I'd be inclined to agree more though if I was trying to get more power out of a 60bhp Fiesta LX but as it stands, my ST model is a great platform to get more power out of (In my opinion, of course
). The 2.0 Duratec engine is in lots of other cars such as Caterham builds carrying silly power, so in this car it has a lot of potential, it comes out of the factory with 147bhp standard and with the mods I mentioned earlier there are others out there with 200bhp+ in these cars. Couple that with it's excellent handling, that makes it a bit more than a shopping trolley tbh Depreciation wise I don't really care, these cars have lost so much value recently there really isn't much more to lose and any modifications can make there money back by splitting it when I part with it in a couple of years
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