Forum:
Has anybody made or fitted a bigger or free flowing exhaust to a fourtrak and if so has it made a difference?
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ive just made a 3" one and
ive just made a 3" one and its made it go abit better,its much better lower down as the turbo spins up quicker so comes on boost sooner,http://forum.difflock.com/viewtopic.php?t=48485
I have a 3" pipe after the
I have a 3" pipe after the front pipe, can't say I noticed any difference.
Lol, glad to see you liked mine Parrot, does yours sound good?
sounds like std on tick over
sounds like std on tick over but when up the revs abit it has a nice deep sound and then when the turbo kicks in you get a nice wisle
Exhausting
Hi.
Looked into a Stainless Steel big bore system some time ago, this was a local company, which has depots nationwide.
For aprox
Edward (ews) '92 Fourtrak 2.8 TDX
Free flowing exhausts are
Free flowing exhausts are generally a waste of time as the engine needs back pressure for the scavenging effect. Any gains are only at the top end of the rev range so are worthless on a 4X4 which uses torque instead of power.
They do come efficient if a range of modifications are made to allow the engine to breathe better and combust more fuel.
Cracking of exhausts is due to either poor material (cheap incorrect grade)and the poor welding of the joints. Many companies use a cheap or alternative stainless steel instead of the correct T304 which is best suited to motor vehicles. T304 has ductility and resists the engine and vehicle vibrations, other stainless does not, this is why it cracks as it is brittle.
Welding stainless to mild steel encounters "electrolytic reaction" which means it accelerates the corrosion of the mild steel. Where it is welded it will corrode at the side of the weld, so another cowboy firm.
Stainless exhausts benefit from long guarantees from manufacturers and reputable brands will be guaranteed for the life of the vehicle. This is cost effective if you intend keeping the vehicle for a long period such as a prepared expedition vehicle.
Fourtrak exhaust manifold
re- Assassins comment about "Free Flowing Exhausts" and back pressure to effectivly remove exhauast gasses and increase BHP of the engine.
To really get any significany improvment you would need a "tuned " exhaust manifold. It is not a case of just a bigger bore pipe, the exit of the gas flow from one valve assists or retards the flow from an adjacent exhaust valve. Manifold tuning is complex, just take a look at what the alternative car market has available.
Bigger bore pipe work , may sound nice, if thats your thing, but it does not always mean more engine BHP. ( not involving CAT's here, as they are a world of there own)
Edward (ews) '92 Fourtrak 2.8 TDX