90boy
Well-Known Member
- Posts
- 6,836
- Location
- Worcestershire, Tenbury Wells
Just fitted my new mid section on my 90 took it for a drive sounds better and gives me loads more power 
New mid pipe = power
- Thread starter 90boy
- Start date
This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
pos
Well-Known Member
- Posts
- 3,685
- Location
- West Yorkshire
When you say that it sounds better does it sound more like a tractor pipe or more beefy?
90boy
Well-Known Member
- Posts
- 6,836
- Location
- Worcestershire, Tenbury Wells
more like a tractor now
90boy
Well-Known Member
- Posts
- 6,836
- Location
- Worcestershire, Tenbury Wells
placebo ??
Griffdowg
New Member
- Posts
- 7,194
- Location
- Somewhere in Bristol
nice one nobber. thinking the same think. cant say i noticed much difference in mine after removing both boxes and shortening the overall length considerably... does sound better though
G
G
nice one nobber. thinking the same think. cant say i noticed much difference in mine after removing both boxes and shortening the overall length considerably... does sound better though
G
yeah , you probably wont ,im no eggspert but the general science is , if it can get out easier its only being throttled on the other side.
you need to sort the induction system out , then the fueling to stop it from running too lean.
then you up the turbo boost if yer brave and depending on how much power your after you might want to put some better pistons in there before you melt them , then you have the valves to worry about , easy on a ohc engine blah blah , i think you get my drift?
straight through exhausts are a step up from go faster stripes though.
Patman1200
Active Member
- Posts
- 908
- Location
- RAE Sleepy Valley
Except on an old Suzuki Bandit 1200 where I gained an extra 20bhp taking it to 113bhp at the rear wheel and melted my neighbours ear'oles..
DTZ
New Member
- Posts
- 328
yeah , you probably wont ,im no eggspert but the general science is , if it can get out easier its only being throttled on the other side.
you need to sort the induction system out , then the fueling to stop it from running too lean.
then you up the turbo boost if yer brave and depending on how much power your after you might want to put some better pistons in there before you melt them , then you have the valves to worry about , easy on a ohc engine blah blah , i think you get my drift?
straight through exhausts are a step up from go faster stripes though.
On a petrol engine maybe... but you can't run a Tdi diesel lean... it just doesn't happen. 'Lean' burning in a petrol means knock, detonation or pre-ignition. Diesel engines run on the knock principle anyway - i.e. compression ignition of fuel which is injected at the right point in the combustion cycle - ergo, no running lean and no melted pistons.
In fact... a mate of mine ran his standard 300 Tdi engine with a modified intake and aftermarket intercooler at 3 bar for a while and reported no problems, despite not changing the fueling. Personally I wouldn't go that high but 1.25 to 1.5 bar is distinctly 'do-able' with stock engine internals with no ill-effects. NOTE - with a standard intake and IC there's no point in going above 1 bar as to make more boost the added heat in the intake charge means that while the pressure is higher the overall quantity of oxygen will be much the same.
RAZ8550TDI
New Member
- Posts
- 3,573
- Location
- liverpool
Just fitted my new mid section on my 90 took it for a drive sounds better and gives me loads more power
am with you on that one 90 boy, revs much more freely, you can vary your back box to adjust and get rid of the tractor sound.
try this WELCOME!
with less back pressure in an exhaust system you tend to lose low end torque , another thing you have to worry about is the velosity at which the gas exits , bigger pipe bore = less back pressure = less velocity at which the gas exits the exhaust.
idealy you want the greatest amount of velocity with the least amount of back pressure , to get velocity the engine has to run at higher revs (this is why your engine is reving more easily) , to lose back pressure you have to remove exhaust restrictions.
so , basically what you are achieving is taking all the low end torque and putting it further up the rev band.
probably a good thing on a high performance car used to being driven in the higher rev bands , not so good on a land rover designed to rely on its low end torque.
idealy you want the greatest amount of velocity with the least amount of back pressure , to get velocity the engine has to run at higher revs (this is why your engine is reving more easily) , to lose back pressure you have to remove exhaust restrictions.
so , basically what you are achieving is taking all the low end torque and putting it further up the rev band.
probably a good thing on a high performance car used to being driven in the higher rev bands , not so good on a land rover designed to rely on its low end torque.
90boy
Well-Known Member
- Posts
- 6,836
- Location
- Worcestershire, Tenbury Wells
well then why is my turbo kicking in about 500rpm sooner than before ???
RAZ8550TDI
New Member
- Posts
- 3,573
- Location
- liverpool
if yer talking about naturally aspirated then yer but when it comes to turbos then you wanna free it up as much as poss.
RAZ8550TDI
New Member
- Posts
- 3,573
- Location
- liverpool
what that might be is you can can hear the turbo through the exhaust now, especially on the over run at low revs.
Diesels like cold air and plenty of it, I fitted my 2.8TD with an exhaust pipe from the turbo with an 18" cherry bomb about a foot from the end. It's about 10 feet overall and quiet.
The air filter has been opened up so it has a bigger inlet to suck on and it goes better and is more economical.
You can hear the air rushing out of the pipe at high revs though ..
The air filter has been opened up so it has a bigger inlet to suck on and it goes better and is more economical.
You can hear the air rushing out of the pipe at high revs though ..
